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-rw-r--r--.hgignore19
-rw-r--r--_ctsrp.py442
-rw-r--r--_pysrp.py225
-rw-r--r--_srp.c1137
-rw-r--r--doc/conf.py194
-rw-r--r--doc/srp.rst127
-rwxr-xr-xsetup.py16
-rw-r--r--srp.py36
-rw-r--r--test_srp.py76
9 files changed, 2272 insertions, 0 deletions
diff --git a/.hgignore b/.hgignore
new file mode 100644
index 0000000..ece540b
--- /dev/null
+++ b/.hgignore
@@ -0,0 +1,19 @@
+syntax: re
+# This line is a comment, and will be skipped.
+# Empty lines are skipped too.
+
+# Backup files left behind by the Emacs editor.
+/*~
+
+\.pyc$
+
+# Lock files used by the Emacs editor.
+# Notice that the "#" character is quoted with a backslash.
+# This prevents it from being interpreted as starting a comment.
+.*\#.*
+
+\.so$
+\.o$
+
+.*old_.*
+\.orig$
diff --git a/_ctsrp.py b/_ctsrp.py
new file mode 100644
index 0000000..4675591
--- /dev/null
+++ b/_ctsrp.py
@@ -0,0 +1,442 @@
+ # N A large safe prime (N = 2q+1, where q is prime)
+ # All arithmetic is done modulo N.
+ # g A generator modulo N
+ # k Multiplier parameter (k = H(N, g) in SRP-6a, k = 3 for legacy SRP-6)
+ # s User's salt
+ # I Username
+ # p Cleartext Password
+ # H() One-way hash function
+ # ^ (Modular) Exponentiation
+ # u Random scrambling parameter
+ # a,b Secret ephemeral values
+ # A,B Public ephemeral values
+ # x Private key (derived from p and s)
+ # v Password verifier
+
+import os
+import sys
+import hashlib
+import random
+import ctypes
+import atexit
+import time
+
+
+SHA256_DIGEST_LENGTH = 32
+
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
+G_HEX = "2"
+HNxorg = None
+
+dlls = list()
+
+if 'win' in sys.platform:
+ for d in ('libeay32.dll', 'libssl32.dll', 'ssleay32.dll'):
+ try:
+ dlls.append( ctypes.cdll.LoadLibrary(d) )
+ except:
+ pass
+else:
+ dlls.append( ctypes.cdll.LoadLibrary('libssl.so') )
+
+
+class BIGNUM_Struct (ctypes.Structure):
+ _fields_ = [ ("d", ctypes.c_void_p),
+ ("top", ctypes.c_int),
+ ("dmax", ctypes.c_int),
+ ("neg", ctypes.c_int),
+ ("flags", ctypes.c_int) ]
+
+
+class BN_CTX_Struct (ctypes.Structure):
+ _fields_ = [ ("_", ctypes.c_byte) ]
+
+
+BIGNUM = ctypes.POINTER( BIGNUM_Struct )
+BN_CTX = ctypes.POINTER( BN_CTX_Struct )
+
+
+def load_func( name, args, returns = ctypes.c_int):
+ d = sys.modules[ __name__ ].__dict__
+ f = None
+
+ for dll in dlls:
+ try:
+ f = getattr(dll, name)
+ f.argtypes = args
+ f.restype = returns
+ d[ name ] = f
+ return
+ except:
+ pass
+ raise ImportError('Unable to load required functions from SSL dlls')
+
+
+load_func( 'BN_new', [], BIGNUM )
+load_func( 'BN_free', [ BIGNUM ], None )
+load_func( 'BN_init', [ BIGNUM ], None )
+load_func( 'BN_clear', [ BIGNUM ], None )
+
+load_func( 'BN_CTX_new', [] , BN_CTX )
+load_func( 'BN_CTX_init', [ BN_CTX ], None )
+load_func( 'BN_CTX_free', [ BN_CTX ], None )
+
+load_func( 'BN_cmp', [ BIGNUM, BIGNUM ], ctypes.c_int )
+
+load_func( 'BN_num_bits', [ BIGNUM ], ctypes.c_int )
+
+load_func( 'BN_add', [ BIGNUM, BIGNUM, BIGNUM ] )
+load_func( 'BN_sub', [ BIGNUM, BIGNUM, BIGNUM ] )
+load_func( 'BN_mul', [ BIGNUM, BIGNUM, BIGNUM, BN_CTX ] )
+load_func( 'BN_div', [ BIGNUM, BIGNUM, BIGNUM, BIGNUM, BN_CTX ] )
+load_func( 'BN_mod_exp', [ BIGNUM, BIGNUM, BIGNUM, BIGNUM, BN_CTX ] )
+
+load_func( 'BN_rand', [ BIGNUM, ctypes.c_int, ctypes.c_int, ctypes.c_int ] )
+
+load_func( 'BN_bn2bin', [ BIGNUM, ctypes.c_char_p ] )
+load_func( 'BN_bin2bn', [ ctypes.c_char_p, ctypes.c_int, BIGNUM ], BIGNUM )
+
+load_func( 'BN_hex2bn', [ ctypes.POINTER(BIGNUM), ctypes.c_char_p ] )
+load_func( 'BN_bn2hex', [ BIGNUM ], ctypes.c_char_p )
+
+load_func( 'CRYPTO_free', [ ctypes.c_char_p ] )
+
+load_func( 'RAND_seed', [ ctypes.c_char_p, ctypes.c_int ] )
+
+
+def BN_num_bytes(a):
+ return ((BN_num_bits(a)+7)/8)
+
+
+def BN_mod(rem,m,d,ctx):
+ return BN_div(None, rem, m, d, ctx)
+
+
+def BN_is_zero( n ):
+ return n[0].top == 0
+
+
+def bn_to_bytes( n ):
+ b = ctypes.create_string_buffer( BN_num_bytes(n) )
+ BN_bn2bin(n, b)
+ return b.raw
+
+
+def bytes_to_bn( dest_bn, bytes ):
+ BN_bin2bn(bytes, len(bytes), dest_bn)
+
+
+def H_str( dest_bn, s ):
+ d = hashlib.sha256(s).digest()
+ buff = ctypes.create_string_buffer( s )
+ BN_bin2bn(d, len(d), dest)
+
+
+def H_bn( dest, n ):
+ bin = ctypes.create_string_buffer( BN_num_bytes(n) )
+ BN_bn2bin(n, bin)
+ d = hashlib.sha256( bin.raw ).digest()
+ BN_bin2bn(d, len(d), dest)
+
+
+def H_bn_bn( dest, n1, n2 ):
+ h = hashlib.sha256()
+ bin1 = ctypes.create_string_buffer( BN_num_bytes(n1) )
+ bin2 = ctypes.create_string_buffer( BN_num_bytes(n2) )
+ BN_bn2bin(n1, bin1)
+ BN_bn2bin(n2, bin2)
+ h.update( bin1.raw )
+ h.update( bin2.raw )
+ d = h.digest()
+ BN_bin2bn(d, len(d), dest)
+
+
+def H_bn_str( dest, n, s ):
+ h = hashlib.sha256()
+ bin = ctypes.create_string_buffer( BN_num_bytes(n) )
+ BN_bn2bin(n, bin)
+ h.update( bin.raw )
+ h.update( s )
+ d = h.digest()
+ BN_bin2bn(d, len(d), dest)
+
+
+def calculate_x( dest, salt, username, password ):
+ up = hashlib.sha256('%s:%s' % (username, password )).digest()
+ H_bn_str( dest, salt, up )
+
+
+def update_hash( ctx, n ):
+ buff = ctypes.create_string_buffer( BN_num_bytes(n) )
+ BN_bn2bin(n, buff)
+ ctx.update( buff.raw )
+
+
+def calculate_M( I, s, A, B, K ):
+ h = hashlib.sha256()
+ h.update( HNxorg )
+ h.update( hashlib.sha256(I).digest() )
+ update_hash( h, s )
+ update_hash( h, A )
+ update_hash( h, B )
+ h.update( K )
+ return h.digest()
+
+
+def calculate_H_AMK( A, M, K ):
+ h = hashlib.sha256()
+ update_hash( h, A )
+ h.update( M )
+ h.update( K )
+ return h.digest()
+
+
+def calculate_HN_xor_Hg():
+ global HNxorg
+
+ bN = ctypes.create_string_buffer( BN_num_bytes(N) )
+ bg = ctypes.create_string_buffer( BN_num_bytes(g) )
+
+ BN_bn2bin(N, bN)
+ BN_bn2bin(g, bg)
+
+ hN = hashlib.sha256( bN.raw ).digest()
+ hg = hashlib.sha256( bg.raw ).digest()
+
+ HNxorg = ''.join( chr( ord(hN[i]) ^ ord(hg[i]) ) for i in range(0,len(hN)) )
+
+
+def gen_sv( username, password ):
+ s = BN_new()
+ v = BN_new()
+ x = BN_new()
+ ctx = BN_CTX_new()
+
+ BN_rand(s, 32, -1, 0);
+
+ calculate_x(x, s, username, password )
+
+ BN_mod_exp(v, g, x, N, ctx)
+
+ salt = bn_to_bytes( s )
+ verifier = bn_to_bytes( v )
+
+ BN_free(s)
+ BN_free(v)
+ BN_free(x)
+ BN_CTX_free(ctx)
+
+ return salt, verifier
+
+
+
+class Verifier (object):
+ def __init__(self, username, bytes_s, bytes_v, bytes_A):
+ self.A = BN_new()
+ self.B = BN_new()
+ self.K = None
+ self.S = BN_new()
+ self.u = BN_new()
+ self.b = BN_new()
+ self.s = BN_new()
+ self.v = BN_new()
+ self.tmp1 = BN_new()
+ self.tmp2 = BN_new()
+ self.ctx = BN_CTX_new()
+ self.I = username
+ self.M = None
+ self.H_AMK = None
+ self._authenticated = False
+
+ self.safety_failed = False
+
+ bytes_to_bn( self.s, bytes_s )
+ bytes_to_bn( self.v, bytes_v )
+ bytes_to_bn( self.A, bytes_A )
+
+ # SRP-6a safety check
+ BN_mod(self.tmp1, self.A, N, self.ctx)
+
+ if BN_is_zero(self.tmp1):
+ self.safety_failed = True
+ else:
+ BN_rand(self.b, 256, -1, 0)
+
+ # B = kv + g^b
+ BN_mul(self.tmp1, k, self.v, self.ctx)
+ BN_mod_exp(self.tmp2, g, self.b, N, self.ctx)
+ BN_add(self.B, self.tmp1, self.tmp2)
+
+ H_bn_bn(self.u, self.A, self.B)
+
+ # S = (A *(v^u)) ^ b
+ BN_mod_exp(self.tmp1, self.v, self.u, N, self.ctx)
+ BN_mul(self.tmp2, self.A, self.tmp1, self.ctx)
+ BN_mod_exp(self.S, self.tmp2, self.b, N, self.ctx)
+
+ self.K = hashlib.sha256( bn_to_bytes(self.S) ).digest()
+
+ self.M = calculate_M( self.I, self.s, self.A, self.B, self.K )
+ self.H_AMK = calculate_H_AMK( self.A, self.M, self.K )
+
+
+ def __del__(self):
+ BN_free(self.A)
+ BN_free(self.B)
+ BN_free(self.S)
+ BN_free(self.u)
+ BN_free(self.b)
+ BN_free(self.s)
+ BN_free(self.v)
+ BN_free(self.tmp1)
+ BN_free(self.tmp2)
+ BN_CTX_free(self.ctx)
+
+
+ def authenticated(self):
+ return self._authenticated
+
+
+ def get_username(self):
+ return self.I
+
+
+ def get_session_key(self):
+ return self.K if self._authenticated else None
+
+
+ # returns (bytes_s, bytes_B) on success, (None,None) if SRP-6a safety check fails
+ def get_challenge(self):
+ if self.safety_failed:
+ return None, None
+ else:
+ return (bn_to_bytes(self.s), bn_to_bytes(self.B))
+
+
+ def verify_session(self, user_M):
+ if user_M == self.M:
+ self._authenticated = True
+ return self.H_AMK
+
+
+
+
+class User (object):
+ def __init__(self, username, password):
+ self.username = username
+ self.password = password
+ self.a = BN_new()
+ self.A = BN_new()
+ self.B = BN_new()
+ self.s = BN_new()
+ self.S = BN_new()
+ self.u = BN_new()
+ self.x = BN_new()
+ self.v = BN_new()
+ self.tmp1 = BN_new()
+ self.tmp2 = BN_new()
+ self.tmp3 = BN_new()
+ self.ctx = BN_CTX_new()
+ self.M = None
+ self.K = None
+ self.H_AMK = None
+ self._authenticated = False
+
+ BN_rand(self.a, 256, -1, 0)
+
+ BN_mod_exp(self.A, g, self.a, N, self.ctx)
+
+
+ def __del__(self):
+ BN_free(self.a)
+ BN_free(self.A)
+ BN_free(self.B)
+ BN_free(self.s)
+ BN_free(self.S)
+ BN_free(self.u)
+ BN_free(self.x)
+ BN_free(self.v)
+ BN_free(self.tmp1)
+ BN_free(self.tmp2)
+ BN_free(self.tmp3)
+ BN_CTX_free(self.ctx)
+
+
+ def authenticated(self):
+ return self._authenticated
+
+
+ def get_username(self):
+ return self.username
+
+
+ def get_session_key(self):
+ return self.K if self._authenticated else None
+
+
+ def start_authentication(self):
+ return (self.username, bn_to_bytes(self.A))
+
+
+ # Returns M or None if SRP-6a safety check is violated
+ def process_challenge(self, bytes_s, bytes_B):
+
+ bytes_to_bn( self.s, bytes_s )
+ bytes_to_bn( self.B, bytes_B )
+
+ # SRP-6a safety check
+ if BN_is_zero(self.B):
+ return None
+
+ H_bn_bn(self.u, self.A, self.B)
+
+ # SRP-6a safety check
+ if BN_is_zero(self.u):
+ return None
+
+ calculate_x( self.x, self.s, self.username, self.password )
+
+ BN_mod_exp(self.v, g, self.x, N, self.ctx)
+
+ # S = (B - k*(g^x)) ^ (a + ux)
+
+ BN_mul(self.tmp1, self.u, self.x, self.ctx)
+ BN_add(self.tmp2, self.a, self.tmp1) # tmp2 = (a + ux)
+ BN_mod_exp(self.tmp1, g, self.x, N, self.ctx)
+ BN_mul(self.tmp3, k, self.tmp1, self.ctx) # tmp3 = k*(g^x)
+ BN_sub(self.tmp1, self.B, self.tmp3) # tmp1 = (B - K*(g^x))
+ BN_mod_exp(self.S, self.tmp1, self.tmp2, N, self.ctx)
+
+ self.K = hashlib.sha256( bn_to_bytes(self.S) ).digest()
+ self.M = calculate_M( self.username, self.s, self.A, self.B, self.K )
+ self.H_AMK = calculate_H_AMK( self.A, self.M, self.K )
+
+ return self.M
+
+
+ def verify_session(self, host_HAMK):
+ if self.H_AMK == host_HAMK:
+ self._authenticated = True
+
+#---------------------------------------------------------
+# Init
+#
+N = BN_new()
+g = BN_new()
+k = BN_new()
+HNxorg = None
+
+BN_hex2bn( N, N_HEX )
+BN_hex2bn( g, G_HEX )
+H_bn_bn(k, N, g)
+
+calculate_HN_xor_Hg()
+
+RAND_seed( os.urandom(32), 32 )
+
+def cleanup():
+ BN_free( N )
+ BN_free( g )
+ BN_free( k )
+
+atexit.register( cleanup )
diff --git a/_pysrp.py b/_pysrp.py
new file mode 100644
index 0000000..8a89e71
--- /dev/null
+++ b/_pysrp.py
@@ -0,0 +1,225 @@
+ # N A large safe prime (N = 2q+1, where q is prime)
+ # All arithmetic is done modulo N.
+ # g A generator modulo N
+ # k Multiplier parameter (k = H(N, g) in SRP-6a, k = 3 for legacy SRP-6)
+ # s User's salt
+ # I Username
+ # p Cleartext Password
+ # H() One-way hash function
+ # ^ (Modular) Exponentiation
+ # u Random scrambling parameter
+ # a,b Secret ephemeral values
+ # A,B Public ephemeral values
+ # x Private key (derived from p and s)
+ # v Password verifier
+
+import hashlib
+import os
+import binascii
+
+
+def bytes_to_long(s):
+ n = ord(s[0])
+ for b in ( ord(x) for x in s[1:] ):
+ n = (n << 8) | b
+ return n
+
+
+def long_to_bytes(n):
+ l = list()
+ x = 0
+ off = 0
+ while x != n:
+ b = (n >> off) & 0xFF
+ l.append( chr(b) )
+ x = x | (b << off)
+ off += 8
+ l.reverse()
+ return ''.join(l)
+
+
+def get_random( nbytes ):
+ return bytes_to_long( os.urandom( nbytes ) )
+
+
+def old_H( s1, s2 = '', s3=''):
+ if isinstance(s1, (long, int)):
+ s1 = long_to_bytes(s1)
+ if s2 and isinstance(s2, (long, int)):
+ s2 = long_to_bytes(s2)
+ if s3 and isinstance(s3, (long, int)):
+ s3 = long_to_bytes(s3)
+ s = s1 + s2 + s3
+ return long(hashlib.sha256(s).hexdigest(), 16)
+
+
+def H( *args, **kwargs ):
+ h = hashlib.sha256()
+
+ for s in args:
+ if s is not None:
+ h.update( long_to_bytes(s) if isinstance(s, (long, int)) else s )
+
+ return long( h.hexdigest(), 16 )
+
+
+
+N = 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
+g = 2;
+k = H(N,g)
+
+hN = hashlib.sha256( long_to_bytes(N) ).digest()
+hg = hashlib.sha256( long_to_bytes(g) ).digest()
+
+HNxorg = ''.join( chr( ord(hN[i]) ^ ord(hg[i]) ) for i in range(0,len(hN)) )
+
+
+
+def gen_x( salt, username, password ):
+ return H( salt, H( username + ':' + password ) )
+
+
+
+
+def gen_sv( username, password ):
+ _s = long_to_bytes( get_random( 4 ) )
+ _v = long_to_bytes( pow(g, gen_x( _s, username, password ), N) )
+
+ return _s, _v
+
+
+
+def calculate_M( I, s, A, B, K ):
+ h = hashlib.sha256()
+ h.update( HNxorg )
+ h.update( hashlib.sha256(I).digest() )
+ h.update( long_to_bytes(s) )
+ h.update( long_to_bytes(A) )
+ h.update( long_to_bytes(B) )
+ h.update( K )
+ return h.digest()
+
+
+def calculate_H_AMK( A, M, K ):
+ h = hashlib.sha256()
+ h.update( long_to_bytes(A) )
+ h.update( M )
+ h.update( K )
+ return h.digest()
+
+
+
+
+class Verifier (object):
+
+ def __init__(self, username, bytes_s, bytes_v, bytes_A):
+ self.s = bytes_to_long(bytes_s)
+ self.v = bytes_to_long(bytes_v)
+ self.I = username
+ self.K = None
+ self._authenticated = False
+
+ self.A = bytes_to_long(bytes_A)
+
+ # SRP-6a safety check
+ self.safety_failed = self.A % N == 0
+
+ if not self.safety_failed:
+
+ self.b = get_random( 32 )
+ self.B = (k*self.v + pow(g, self.b, N)) % N
+ self.u = H(self.A, self.B)
+ self.S = pow(self.A*pow(self.v, self.u, N ), self.b, N)
+ self.K = hashlib.sha256( long_to_bytes(self.S) ).digest()
+ self.M = calculate_M( self.I, self.s, self.A, self.B, self.K )
+ self.H_AMK = calculate_H_AMK(self.A, self.M, self.K)
+
+
+ def authenticated(self):
+ return self._authenticated
+
+
+ def get_username(self):
+ return self.I
+
+
+ def get_session_key(self):
+ return self.K if self._authenticated else None
+
+ # returns (bytes_s, bytes_B) on success, (None,None) if SRP-6a safety check fails
+ def get_challenge(self):
+ if self.safety_failed:
+ return None,None
+ else:
+ return (long_to_bytes(self.s), long_to_bytes(self.B))
+
+ # returns H_AMK on success, None on failure
+ def verify_session(self, user_M):
+ if not self.safety_failed and user_M == self.M:
+ self._authenticated = True
+ return self.H_AMK
+
+
+
+
+class User (object):
+ def __init__(self, username, password):
+ self.I = username
+ self.p = password
+ self.a = get_random( 32 )
+ self.A = pow(g, self.a, N)
+ self.v = None
+ self.M = None
+ self.K = None
+ self.H_AMK = None
+ self._authenticated = False
+
+
+ def authenticated(self):
+ return self._authenticated
+
+
+ def get_username(self):
+ return self.username
+
+
+ def get_session_key(self):
+ return self.K if self._authenticated else None
+
+
+ def start_authentication(self):
+ return (self.I, long_to_bytes(self.A))
+
+
+ # Returns M or None if SRP-6a safety check is violated
+ def process_challenge(self, bytes_s, bytes_B):
+
+ self.s = bytes_to_long( bytes_s )
+ self.B = bytes_to_long( bytes_B )
+
+ # SRP-6a safety check
+ if (self.B % N) == 0:
+ return None
+
+ self.u = H( self.A, self.B )
+
+ # SRP-6a safety check
+ if self.u == 0:
+ return None
+
+ self.x = gen_x( self.s, self.I, self.p )
+
+ self.v = pow(g, self.x, N)
+
+ self.S = pow((self.B - k*self.v), (self.a + self.u*self.x), N)
+
+ self.K = hashlib.sha256( long_to_bytes(self.S) ).digest()
+ self.M = calculate_M( self.I, self.s, self.A, self.B, self.K )
+ self.H_AMK = calculate_H_AMK(self.A, self.M, self.K)
+
+ return self.M
+
+
+ def verify_session(self, host_HAMK):
+ if self.H_AMK == host_HAMK:
+ self._authenticated = True
diff --git a/_srp.c b/_srp.c
new file mode 100644
index 0000000..fbb57a2
--- /dev/null
+++ b/_srp.c
@@ -0,0 +1,1137 @@
+#include <Python.h>
+#include <stdlib.h>
+#include <string.h>
+#include <stdio.h>
+
+#include <openssl/bn.h>
+#include <openssl/sha.h>
+#include <openssl/crypto.h>
+#include <openssl/rand.h>
+
+/* 2048-bit prime & generator pair from RFC 5054 */
+#define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
+#define G_HEX "2"
+
+
+static const BIGNUM * N = 0;
+static const BIGNUM * g = 0;
+static const BIGNUM * k = 0;
+
+
+struct SRPVerifier
+{
+ const char * username;
+ const unsigned char * bytes_B;
+ int authenticated;
+
+ unsigned char M [SHA256_DIGEST_LENGTH];
+ unsigned char H_AMK [SHA256_DIGEST_LENGTH];
+ unsigned char session_key [SHA256_DIGEST_LENGTH];
+};
+
+
+struct SRPUser
+{
+ BIGNUM *a;
+ BIGNUM *A;
+ BIGNUM *S;
+
+ const unsigned char * bytes_A;
+ int authenticated;
+
+ const char * username;
+ const unsigned char * password;
+ int password_len;
+
+ unsigned char M [SHA256_DIGEST_LENGTH];
+ unsigned char H_AMK [SHA256_DIGEST_LENGTH];
+ unsigned char session_key [SHA256_DIGEST_LENGTH];
+};
+
+
+/******************************************************************************
+ *
+ * SRP Internal Helper Functions
+ *
+ *****************************************************************************/
+
+/*
+static BIGNUM * H_s( const char * s )
+{
+ unsigned char buff[ SHA256_DIGEST_LENGTH ];
+ SHA256( (const unsigned char *)s, strlen(s), buff );
+ return BN_bin2bn(buff, SHA256_DIGEST_LENGTH, NULL);
+}
+
+
+static BIGNUM * H_n( const BIGNUM * n )
+{
+ unsigned char buff[ SHA256_DIGEST_LENGTH ];
+ int nbytes = BN_num_bytes(n);
+ unsigned char * bin = (unsigned char *) malloc( nbytes );
+ BN_bn2bin(n, bin);
+ SHA256( bin, nbytes, buff );
+ free(bin);
+ return BN_bin2bn(buff, SHA256_DIGEST_LENGTH, NULL);
+}
+*/
+
+static BIGNUM * H_nn( const BIGNUM * n1, const BIGNUM * n2 )
+{
+ unsigned char buff[ SHA256_DIGEST_LENGTH ];
+ int len_n1 = BN_num_bytes(n1);
+ int len_n2 = BN_num_bytes(n2);
+ int nbytes = len_n1 + len_n2;
+ unsigned char * bin = (unsigned char *) malloc( nbytes );
+ BN_bn2bin(n1, bin);
+ BN_bn2bin(n2, bin + len_n1);
+ SHA256( bin, nbytes, buff );
+ free(bin);
+ return BN_bin2bn(buff, SHA256_DIGEST_LENGTH, NULL);
+}
+
+
+static BIGNUM * H_ns( const BIGNUM * n,
+ const unsigned char * bytes,
+ int len_bytes )
+{
+ unsigned char buff[ SHA256_DIGEST_LENGTH ];
+ int len_n = BN_num_bytes(n);
+ int nbytes = len_n + len_bytes;
+ unsigned char * bin = (unsigned char *) malloc( nbytes );
+ BN_bn2bin(n, bin);
+ memcpy( bin + len_n, bytes, len_bytes );
+ SHA256( bin, nbytes, buff );
+ free(bin);
+ return BN_bin2bn(buff, SHA256_DIGEST_LENGTH, NULL);
+}
+
+
+static BIGNUM * calculate_x( const BIGNUM * salt,
+ const char * username,
+ const unsigned char * password,
+ int password_len )
+{
+ unsigned char ucp_hash[SHA256_DIGEST_LENGTH];
+ SHA256_CTX ctx;
+
+ SHA256_Init( &ctx );
+
+ SHA256_Update( &ctx, username, strlen(username) );
+ SHA256_Update( &ctx, ":", 1 );
+ SHA256_Update( &ctx, password, password_len );
+
+ SHA256_Final( ucp_hash, &ctx );
+
+ return H_ns( salt, ucp_hash, sizeof(ucp_hash) );
+}
+
+
+static void update_hash( SHA256_CTX *ctx, const BIGNUM * n )
+{
+ unsigned long len = BN_num_bytes(n);
+ unsigned char * n_bytes = (unsigned char *) malloc( len );
+ BN_bn2bin(n, n_bytes);
+ SHA256_Update(ctx, n_bytes, len);
+ free( n_bytes );
+}
+
+
+static void hash_num( const BIGNUM * n, unsigned char * dest )
+{
+ int nbytes = BN_num_bytes(n);
+ unsigned char * bin = (unsigned char *) malloc( nbytes );
+ BN_bn2bin(n, bin);
+ SHA256( bin, nbytes, dest );
+ free( bin );
+}
+
+
+static void calculate_M( unsigned char * dest,
+ const char * I,
+ const BIGNUM * s,
+ const BIGNUM * A,
+ const BIGNUM * B,
+ const unsigned char * K )
+{
+ unsigned char H_N[ SHA256_DIGEST_LENGTH ];
+ unsigned char H_g[ SHA256_DIGEST_LENGTH ];
+ unsigned char H_I[ SHA256_DIGEST_LENGTH ];
+ unsigned char H_xor[ SHA256_DIGEST_LENGTH ];
+ SHA256_CTX ctx;
+ int i = 0;
+
+ hash_num( N, H_N );
+ hash_num( g, H_g );
+
+ SHA256((const unsigned char *)I, strlen(I), H_I);
+
+ for (i=0; i < SHA256_DIGEST_LENGTH; i++ )
+ H_xor[i] = H_N[i] ^ H_g[i];
+
+ SHA256_Init( &ctx );
+
+ SHA256_Update( &ctx, H_xor, sizeof(H_xor) );
+ SHA256_Update( &ctx, H_I, sizeof(H_I) );
+ update_hash( &ctx, s );
+ update_hash( &ctx, A );
+ update_hash( &ctx, B );
+ SHA256_Update( &ctx, K, SHA256_DIGEST_LENGTH );
+
+ SHA256_Final( dest, &ctx );
+}
+
+
+static void calculate_H_AMK( unsigned char * dest,
+ const BIGNUM * A,
+ const unsigned char * M,
+ const unsigned char * K )
+{
+ SHA256_CTX ctx;
+
+ SHA256_Init( &ctx );
+
+ update_hash( &ctx, A );
+ SHA256_Update( &ctx, M, SHA256_DIGEST_LENGTH);
+ SHA256_Update( &ctx, K, SHA256_DIGEST_LENGTH);
+
+ SHA256_Final( dest, &ctx );
+}
+
+
+/******************************************************************************
+ *
+ * SRP "external" API
+ *
+ *****************************************************************************/
+
+static void srp_init( const char * random_seed, int seed_len )
+{
+ BIGNUM *tN = BN_new();
+ BIGNUM *tg = BN_new();
+
+ BN_hex2bn( &tN, N_HEX );
+ BN_hex2bn( &tg, G_HEX );
+
+ N = tN;
+ g = tg;
+
+ k = H_nn(N,g);
+
+ RAND_seed( random_seed, seed_len );
+}
+
+static void srp_fini( void )
+{
+ BN_free((BIGNUM *)N);
+ BN_free((BIGNUM *)g);
+ BN_free((BIGNUM *)k);
+
+ N = 0;
+ g = 0;
+}
+
+
+static void srp_gen_sv( const char * username,
+ const unsigned char * password, int len_password,
+ const unsigned char ** bytes_s, int * len_s,
+ const unsigned char ** bytes_v, int * len_v )
+{
+ BIGNUM * s = BN_new();
+ BIGNUM * v = BN_new();
+ BIGNUM * x = 0;
+ BN_CTX *ctx = BN_CTX_new();
+
+ BN_rand(s, 32, -1, 0);
+
+ x = calculate_x( s, username, password, len_password );
+
+ BN_mod_exp(v, g, x, N, ctx);
+
+ *len_s = BN_num_bytes(s);
+ *len_v = BN_num_bytes(v);
+
+ *bytes_s = (const unsigned char *) malloc( *len_s );
+ *bytes_v = (const unsigned char *) malloc( *len_v );
+
+ BN_bn2bin(s, (unsigned char *) *bytes_s);
+ BN_bn2bin(v, (unsigned char *) *bytes_v);
+
+ BN_free(s);
+ BN_free(v);
+ BN_free(x);
+ BN_CTX_free(ctx);
+}
+
+
+/* Out: bytes_B, len_B.
+ *
+ * On failure, bytes_B will be set to NULL and len_B will be set to 0
+ */
+static struct SRPVerifier * srp_verifier_new( const char * username,
+ const unsigned char * bytes_s, int len_s,
+ const unsigned char * bytes_v, int len_v,
+ const unsigned char * bytes_A, int len_A,
+ const unsigned char ** bytes_B, int * len_B)
+{
+ BIGNUM *s = BN_bin2bn(bytes_s, len_s, NULL);
+ BIGNUM *v = BN_bin2bn(bytes_v, len_v, NULL);
+ BIGNUM *A = BN_bin2bn(bytes_A, len_A, NULL);
+ BIGNUM *u = 0;
+ BIGNUM *B = BN_new();
+ BIGNUM *S = BN_new();
+ BIGNUM *b = BN_new();
+ BIGNUM *tmp1 = BN_new();
+ BIGNUM *tmp2 = BN_new();
+ BN_CTX *ctx = BN_CTX_new();
+ int ulen = strlen(username) + 1;
+
+ struct SRPVerifier * ver;
+
+ ver = (struct SRPVerifier *) malloc( sizeof(struct SRPVerifier) );
+
+ ver->username = (char *) malloc( ulen );
+
+ memcpy( (char*)ver->username, username, ulen );
+
+ ver->authenticated = 0;
+
+ /* SRP-6a safety check */
+ BN_mod(tmp1, A, N, ctx);
+ if ( !BN_is_zero(tmp1) )
+ {
+ BN_rand(b, 256, -1, 0);
+
+ /* B = kv + g^b */
+ BN_mul(tmp1, k, v, ctx);
+ BN_mod_exp(tmp2, g, b, N, ctx);
+ BN_add(B, tmp1, tmp2);
+
+ u = H_nn(A,B);
+
+ /* S = (A *(v^u)) ^ b */
+ BN_mod_exp(tmp1, v, u, N, ctx);
+ BN_mul(tmp2, A, tmp1, ctx);
+ BN_mod_exp(S, tmp2, b, N, ctx);
+
+ hash_num(S, ver->session_key);
+
+ calculate_M( ver->M, username, s, A, B, ver->session_key );
+ calculate_H_AMK( ver->H_AMK, A, ver->M, ver->session_key );
+
+ *len_B = BN_num_bytes(B);
+ *bytes_B = malloc( *len_B );
+
+ BN_bn2bin( B, (unsigned char *) *bytes_B );
+
+ ver->bytes_B = *bytes_B;
+ }
+ else
+ {
+ *len_B = 0;
+ *bytes_B = NULL;
+ }
+
+ BN_free(s);
+ BN_free(v);
+ BN_free(A);
+ if (u) BN_free(u);
+ BN_free(B);
+ BN_free(S);
+ BN_free(b);
+ BN_free(tmp1);
+ BN_free(tmp2);
+ BN_CTX_free(ctx);
+
+ return ver;
+}
+
+
+static void srp_verifier_delete( struct SRPVerifier * ver )
+{
+ free( (char *) ver->username );
+ free( (unsigned char *) ver->bytes_B );
+ free( ver );
+}
+
+
+static int srp_verifier_is_authenticated( struct SRPVerifier * ver )
+{
+ return ver->authenticated;
+}
+
+
+static const char * srp_verifier_get_username( struct SRPVerifier * ver )
+{
+ return ver->username;
+}
+
+
+/* Key length is SHA256_DIGEST_LENGTH */
+static const unsigned char *
+srp_verifier_get_session_key( struct SRPVerifier * ver )
+{
+ return ver->session_key;
+}
+
+
+/* user_M must be exactly SHA256_DIGEST_LENGTH bytes in size */
+static void srp_verifier_verify_session( struct SRPVerifier * ver,
+ const unsigned char * user_M,
+ const unsigned char ** bytes_HAMK )
+{
+ if ( memcmp( ver->M, user_M, SHA256_DIGEST_LENGTH ) == 0 )
+ {
+ ver->authenticated = 1;
+ *bytes_HAMK = ver->H_AMK;
+ }
+ else
+ *bytes_HAMK = NULL;
+}
+
+
+/*******************************************************************************/
+
+static struct SRPUser * srp_user_new( const char * username,
+ const unsigned char * bytes_password,
+ int len_password )
+{
+ struct SRPUser *usr;
+ int ulen = strlen(username) + 1;
+
+ usr = (struct SRPUser *) malloc( sizeof(struct SRPUser) );
+
+ usr->a = BN_new();
+ usr->A = BN_new();
+ usr->S = BN_new();
+
+ usr->username = (const char *) malloc(ulen);
+ usr->password = (const unsigned char *) malloc(len_password);
+ usr->password_len = len_password;
+
+ memcpy((char *)usr->username, username, ulen);
+ memcpy((char *)usr->password, bytes_password, len_password);
+
+ usr->bytes_A = 0;
+
+ return usr;
+}
+
+
+static void srp_user_delete( struct SRPUser * usr )
+{
+ BN_free( usr->a );
+ BN_free( usr->A );
+ BN_free( usr->S );
+
+ free((char *)usr->username);
+ free((char *)usr->password);
+
+ if (usr->bytes_A)
+ free( (char *)usr->bytes_A );
+
+ free( usr );
+}
+
+
+static int srp_user_is_authenticated( struct SRPUser * usr)
+{
+ return usr->authenticated;
+}
+
+
+static const char * srp_user_get_username( struct SRPUser * usr )
+{
+ return usr->username;
+}
+
+
+/* Key length is SHA256_DIGEST_LENGTH */
+static const unsigned char * srp_user_get_session_key( struct SRPUser * usr )
+{
+ return usr->session_key;
+}
+
+
+/* Output: username, bytes_A, len_A */
+static void srp_user_start_authentication( struct SRPUser * usr,
+ const char ** username,
+ const unsigned char ** bytes_A,
+ int * len_A )
+{
+ BN_CTX *ctx = BN_CTX_new();
+
+ BN_rand(usr->a, 256, -1, 0);
+
+ BN_mod_exp(usr->A, g, usr->a, N, ctx);
+
+ BN_CTX_free(ctx);
+
+ *len_A = BN_num_bytes(usr->A);
+ *bytes_A = malloc( *len_A );
+
+ BN_bn2bin( usr->A, (unsigned char *) *bytes_A );
+
+ usr->bytes_A = *bytes_A;
+ *username = usr->username;
+}
+
+
+/* Output: bytes_M. Buffer length is SHA256_DIGEST_LENGTH */
+static void srp_user_process_challenge( struct SRPUser * usr,
+ const unsigned char * bytes_s,
+ int len_s,
+ const unsigned char * bytes_B,
+ int len_B,
+ const unsigned char ** bytes_M )
+{
+ BIGNUM *s = BN_bin2bn(bytes_s, len_s, NULL);
+ BIGNUM *B = BN_bin2bn(bytes_B, len_B, NULL);
+ BIGNUM *u = 0;
+ BIGNUM *x = 0;
+ BIGNUM *v = BN_new();
+ BIGNUM *tmp1 = BN_new();
+ BIGNUM *tmp2 = BN_new();
+ BIGNUM *tmp3 = BN_new();
+ BN_CTX *ctx = BN_CTX_new();
+
+ u = H_nn(usr->A,B);
+
+ x = calculate_x( s, usr->username, usr->password, usr->password_len );
+
+ /* SRP-6a safety check */
+ if ( !BN_is_zero(B) && !BN_is_zero(u) )
+ {
+ BN_mod_exp(v, g, x, N, ctx);
+
+ /* S = (B - k*(g^x)) ^ (a + ux) */
+ BN_mul(tmp1, u, x, ctx);
+ BN_add(tmp2, usr->a, tmp1); /* tmp2 = (a + ux) */
+ BN_mod_exp(tmp1, g, x, N, ctx);
+ BN_mul(tmp3, k, tmp1, ctx); /* tmp3 = k*(g^x) */
+ BN_sub(tmp1, B, tmp3); /* tmp1 = (B - K*(g^x)) */
+ BN_mod_exp(usr->S, tmp1, tmp2, N, ctx);
+
+ hash_num(usr->S, usr->session_key);
+
+ calculate_M( usr->M, usr->username, s, usr->A, B, usr->session_key );
+ calculate_H_AMK( usr->H_AMK, usr->A, usr->M, usr->session_key );
+
+ *bytes_M = usr->M;
+ }
+ else
+ {
+ *bytes_M = NULL;
+ }
+
+ BN_free(s);
+ BN_free(B);
+ BN_free(u);
+ BN_free(x);
+ BN_free(v);
+ BN_free(tmp1);
+ BN_free(tmp2);
+ BN_free(tmp3);
+ BN_CTX_free(ctx);
+}
+
+/* bytes_HAMK must be exactly SHA256_DIGEST_LENGTH bytes in size */
+static void srp_user_verify_session( struct SRPUser * usr,
+ const unsigned char * bytes_HAMK )
+{
+ if ( memcmp( usr->H_AMK, bytes_HAMK, SHA256_DIGEST_LENGTH ) == 0 )
+ usr->authenticated = 1;
+}
+
+
+/******************************************************************************
+ *
+ * Python Module
+ *
+ *****************************************************************************/
+
+typedef struct
+{
+ PyObject_HEAD
+ struct SRPVerifier * ver;
+ const unsigned char * bytes_B;
+ const unsigned char * bytes_s;
+ int len_B;
+ int len_s;
+}PyVerifier;
+
+
+typedef struct
+{
+ PyObject_HEAD
+ struct SRPUser * usr;
+}PyUser;
+
+
+static void ver_dealloc( PyVerifier * self )
+{
+ if ( self->ver != NULL )
+ srp_verifier_delete( self->ver );
+
+ if ( self->bytes_s != NULL )
+ free( (char *)self->bytes_s );
+
+ self->ob_type->tp_free( (PyObject *) self );
+}
+
+
+static void usr_dealloc( PyUser * self )
+{
+ if ( self->usr != NULL )
+ srp_user_delete( self->usr );
+ self->ob_type->tp_free( (PyObject *) self );
+}
+
+
+static PyObject * ver_new(PyTypeObject *type, PyObject *args, PyObject *kwds)
+{
+ PyVerifier *self = (PyVerifier *) type->tp_alloc(type, 0);
+
+ if (!self)
+ return NULL;
+
+ self->ver = NULL;
+ self->bytes_B = NULL;
+ self->bytes_s = NULL;
+ self->len_B = 0;
+ self->len_s = 0;
+
+ return (PyObject *) self;
+}
+
+
+static PyObject * usr_new(PyTypeObject *type, PyObject *args, PyObject *kwds)
+{
+ PyUser *self = (PyUser *) type->tp_alloc(type, 0);
+
+ if (!self)
+ return NULL;
+
+ self->usr = NULL;
+
+ return (PyObject *) self;
+}
+
+
+static int ver_init( PyVerifier *self, PyObject *args, PyObject *kwds )
+{
+ const char *username;
+ const unsigned char *bytes_s, *bytes_v, *bytes_A;
+ int len_s, len_v, len_A;
+
+ if ( self->ver != NULL )
+ {
+ PyErr_SetString(PyExc_TypeError, "Type cannot be re-initialized");
+ return -1;
+ }
+
+ if ( ! PyArg_ParseTuple(args, "st#t#t#", &username,
+ &bytes_s, &len_s,
+ &bytes_v, &len_v,
+ &bytes_A, &len_A) )
+ {
+ return -1;
+ }
+
+ /* The srp_verifier_new command is computationally intensive... ~15ms on a
+ * 3Ghz x86 CPU. Allowing multiple, simultaneous calls here may speed
+ * things up for multi-cpu machines
+ */
+ Py_BEGIN_ALLOW_THREADS
+ self->ver = srp_verifier_new( username,
+ bytes_s, len_s,
+ bytes_v, len_v,
+ bytes_A, len_A,
+ &self->bytes_B, &self->len_B );
+ Py_END_ALLOW_THREADS
+
+ if ( self->bytes_B == NULL )
+ {
+ PyErr_SetString(PyExc_Exception, "SRP-6a safety check violated");
+ return -1;
+ }
+
+ self->bytes_s = malloc( len_s );
+ self->len_s = len_s;
+
+ memcpy( (char *)self->bytes_s, bytes_s, len_s );
+
+ return 0;
+}
+
+
+static int usr_init( PyUser *self, PyObject *args, PyObject *kwds )
+{
+ const char *username;
+ const unsigned char *bytes_password;
+ int len_password;
+
+ if ( self->usr != NULL )
+ {
+ PyErr_SetString(PyExc_TypeError, "Type cannot be re-initialized");
+ return -1;
+ }
+
+ if ( ! PyArg_ParseTuple(args, "st#", &username,
+ &bytes_password,
+ &len_password) )
+ {
+ return -1;
+ }
+
+
+ self->usr = srp_user_new( username, bytes_password, len_password );
+
+ return 0;
+}
+
+
+static PyObject * ver_is_authenticated( PyVerifier * self )
+{
+ if ( self->ver == NULL ) {
+ PyErr_SetString(PyExc_Exception, "Type not initialized");
+ return NULL;
+ }
+ if ( srp_verifier_is_authenticated(self->ver) )
+ Py_RETURN_TRUE;
+ else
+ Py_RETURN_FALSE;
+}
+
+
+static PyObject * usr_is_authenticated( PyUser * self )
+{
+ if ( self->usr == NULL ) {
+ PyErr_SetString(PyExc_Exception, "Type not initialized");
+ return NULL;
+ }
+ if ( srp_user_is_authenticated(self->usr) )
+ Py_RETURN_TRUE;
+ else
+ Py_RETURN_FALSE;
+}
+
+
+static PyObject * ver_get_username( PyVerifier * self )
+{
+ if ( self->ver == NULL ) {
+ PyErr_SetString(PyExc_Exception, "Type not initialized");
+ return NULL;
+ }
+
+ return PyString_FromString( srp_verifier_get_username(self->ver) );
+}
+
+
+static PyObject * usr_get_username( PyUser * self )
+{
+ if ( self->usr == NULL ) {
+ PyErr_SetString(PyExc_Exception, "Type not initialized");
+ return NULL;
+ }
+
+ return PyString_FromString( srp_user_get_username(self->usr) );
+}
+
+
+static PyObject * ver_get_session_key( PyVerifier * self )
+{
+ if ( self->ver == NULL ) {
+ PyErr_SetString(PyExc_Exception, "Type not initialized");
+ return NULL;
+ }
+ if ( srp_verifier_is_authenticated(self->ver) )
+ {
+ const char * u = (const char *)srp_verifier_get_session_key(self->ver);
+ return PyString_FromStringAndSize(u, SHA256_DIGEST_LENGTH);
+ }
+ else
+ Py_RETURN_NONE;
+}
+
+
+static PyObject * usr_get_session_key( PyUser * self )
+{
+ if ( self->usr == NULL ) {
+ PyErr_SetString(PyExc_Exception, "Type not initialized");
+ return NULL;
+ }
+ if ( srp_user_is_authenticated(self->usr) )
+ {
+ const char * u = (const char *) srp_user_get_session_key(self->usr);
+ return PyString_FromStringAndSize(u, SHA256_DIGEST_LENGTH);
+ }
+ else
+ Py_RETURN_NONE;
+}
+
+
+static PyObject * ver_get_challenge( PyVerifier * self )
+{
+ if ( self->ver == NULL ) {
+ PyErr_SetString(PyExc_Exception, "Type not initialized");
+ return NULL;
+ }
+ if ( self->bytes_B == NULL ) {
+ PyErr_SetString(PyExc_Exception, "SRP-6a security check failed");
+ return NULL;
+ }
+
+ return Py_BuildValue("s#s#", self->bytes_s,
+ self->len_s,
+ self->bytes_B,
+ self->len_B);
+}
+
+
+static PyObject * ver_verify_session( PyVerifier * self, PyObject * args )
+{
+ const unsigned char * bytes_M;
+ const unsigned char * bytes_HAMK;
+ int len_M;
+
+ if ( self->ver == NULL ) {
+ PyErr_SetString(PyExc_Exception, "Type not initialized");
+ return NULL;
+ }
+
+ if ( ! PyArg_ParseTuple(args, "t#", &bytes_M, &len_M) )
+ {
+ return NULL;
+ }
+
+ if ( len_M != SHA256_DIGEST_LENGTH )
+ Py_RETURN_NONE;
+
+ srp_verifier_verify_session( self->ver, bytes_M, &bytes_HAMK );
+
+ if ( bytes_HAMK == NULL )
+ Py_RETURN_NONE;
+ else
+ return PyString_FromStringAndSize((const char *) bytes_HAMK,
+ SHA256_DIGEST_LENGTH);
+}
+
+
+static PyObject * usr_start_authentication( PyUser * self )
+{
+ const char * username;
+ const unsigned char * bytes_A;
+ int len_A;
+
+ if ( self->usr == NULL ) {
+ PyErr_SetString(PyExc_Exception, "Type not initialized");
+ return NULL;
+ }
+
+ srp_user_start_authentication( self->usr, &username, &bytes_A, &len_A );
+
+ return Py_BuildValue("ss#", username, bytes_A, len_A);
+}
+
+
+static PyObject * usr_process_challenge( PyUser * self, PyObject * args )
+{
+ const unsigned char * bytes_s, *bytes_B;
+ int len_s, len_B;
+ const unsigned char * bytes_M;
+
+ if ( self->usr == NULL ) {
+ PyErr_SetString(PyExc_Exception, "Type not initialized");
+ return NULL;
+ }
+
+ if ( ! PyArg_ParseTuple(args, "t#t#", &bytes_s, &len_s, &bytes_B,
+ &len_B) )
+ {
+ return NULL;
+ }
+
+ /* The srp_user_process_challenge command is computationally intensive...
+ * ~20ms on a 2Ghz x86 CPU. Allowing multiple, simultaneous calls here will
+ * speed things up for multi-cpu machines.
+ */
+ Py_BEGIN_ALLOW_THREADS
+ srp_user_process_challenge( self->usr, bytes_s, len_s, bytes_B, len_B,
+ &bytes_M );
+ Py_END_ALLOW_THREADS
+
+ if (bytes_M == NULL)
+ Py_RETURN_NONE;
+ else
+ return PyString_FromStringAndSize((const char *) bytes_M,
+ SHA256_DIGEST_LENGTH);
+}
+
+
+static PyObject * usr_verify_session( PyUser * self, PyObject * args )
+{
+ const unsigned char * bytes_HAMK;
+ int len_HAMK;
+
+ if ( self->usr == NULL ) {
+ PyErr_SetString(PyExc_Exception, "Type not initialized");
+ return NULL;
+ }
+
+ if ( ! PyArg_ParseTuple(args, "t#", &bytes_HAMK, &len_HAMK) )
+ {
+ return NULL;
+ }
+
+ if ( len_HAMK == SHA256_DIGEST_LENGTH )
+ srp_user_verify_session( self->usr, bytes_HAMK );
+
+ Py_RETURN_NONE;
+}
+
+
+static PyObject * py_gen_sv( PyObject *self, PyObject *args )
+{
+ const char *username;
+ const unsigned char *bytes_password, *bytes_s, *bytes_v;
+ int len_password, len_s, len_v;
+ PyObject *ret;
+
+ if ( ! PyArg_ParseTuple(args, "st#", &username, &bytes_password,
+ &len_password) )
+ return NULL;
+
+
+ srp_gen_sv( username, bytes_password, len_password, &bytes_s, &len_s,
+ &bytes_v, &len_v );
+
+ ret = Py_BuildValue("s#s#", bytes_s, len_s, bytes_v, len_v);
+
+ free((char*)bytes_s);
+ free((char*)bytes_v);
+
+ return ret;
+}
+
+
+/***********************************************************************************/
+static PyMethodDef PyVerifier_methods[] = {
+ {"authenticated", (PyCFunction) ver_is_authenticated, METH_NOARGS,
+ PyDoc_STR("Returns boolean indicating whether the session is "
+ "authenticated or not")
+ },
+ {"get_username", (PyCFunction) ver_get_username, METH_NOARGS,
+ PyDoc_STR("Returns the username the Verifier instance is bound to.")
+ },
+ {"get_session_key", (PyCFunction) ver_get_session_key, METH_NOARGS,
+ PyDoc_STR("Returns the session key for an authenticated session. "
+ "Returns None if the session is not authenticated.")
+ },
+ {"get_challenge", (PyCFunction) ver_get_challenge, METH_NOARGS,
+ PyDoc_STR("Returns: (s,B) or None. The salt & challenge that "
+ "should be sent to the user or None if the SRP-6a "
+ "safety check fails.")
+ },
+ {"verify_session", (PyCFunction) ver_verify_session, METH_VARARGS,
+ PyDoc_STR("Verifies the user based on their reply to "
+ "the challenge")
+ },
+ {NULL} /* Sentinel */
+};
+
+
+static PyMethodDef PyUser_methods[] = {
+ {"authenticated", (PyCFunction) usr_is_authenticated, METH_NOARGS,
+ PyDoc_STR("Returns boolean indicating whether the session is "
+ "authenticated or not")
+ },
+ {"get_username", (PyCFunction) usr_get_username, METH_NOARGS,
+ PyDoc_STR("Returns the username the User instance is bound to.")
+ },
+ {"get_session_key", (PyCFunction) usr_get_session_key, METH_NOARGS,
+ PyDoc_STR("Returns the session key for an authenticated session. "
+ "Returns None if the session is not authenticated.")
+ },
+ {"start_authentication", (PyCFunction) usr_start_authentication,
+ METH_NOARGS,
+ PyDoc_STR("Returns (username,A). The username and initial "
+ "authentication challenge to send to the verifier")
+ },
+ {"process_challenge", (PyCFunction) usr_process_challenge, METH_VARARGS,
+ PyDoc_STR("Returns the reply to send to the server or None if the "
+ "SRP-6a safety check fails")
+ },
+ {"verify_session", (PyCFunction) usr_verify_session, METH_VARARGS,
+ PyDoc_STR("Verifies the server based on its reply to the users "
+ "challenge response")
+ },
+ {NULL} /* Sentinel */
+};
+
+
+static PyMethodDef srp_module_methods[] = {
+ {"gen_sv", (PyCFunction) py_gen_sv, METH_VARARGS,
+ PyDoc_STR("Returns (s,v): Generates a salt + verifier for the "
+ "given username and password")
+ },
+ {NULL} /* Sentinel */
+};
+
+
+static PyTypeObject PyVerifier_Type = {
+ PyVarObject_HEAD_INIT(NULL, 0)
+ "_srp.Verifier", /*tp_name*/
+ sizeof(PyVerifier), /*tp_basicsize*/
+ 0, /*tp_itemsize*/
+ /* methods */
+ (destructor)ver_dealloc, /*tp_dealloc*/
+ 0, /*tp_print*/
+ 0, /*tp_getattr*/
+ 0, /*tp_setattr*/
+ 0, /*tp_compare*/
+ 0, /*tp_repr*/
+ 0, /*tp_as_number*/
+ 0, /*tp_as_sequence*/
+ 0, /*tp_as_mapping*/
+ 0, /*tp_hash*/
+ 0, /*tp_call*/
+ 0, /*tp_str*/
+ 0, /*tp_getattro*/
+ 0, /*tp_setattro*/
+ 0, /*tp_as_buffer*/
+ Py_TPFLAGS_DEFAULT, /*tp_flags*/
+ "SRP-6a verfier", /*tp_doc*/
+ 0, /*tp_traverse*/
+ 0, /*tp_clear*/
+ 0, /*tp_richcompare*/
+ 0, /*tp_weaklistoffset*/
+ 0, /*tp_iter*/
+ 0, /*tp_iternext*/
+ PyVerifier_methods, /*tp_methods*/
+ 0, /*tp_members*/
+ 0, /*tp_getset*/
+ 0, /*tp_base*/
+ 0, /*tp_dict*/
+ 0, /*tp_descr_get*/
+ 0, /*tp_descr_set*/
+ 0, /*tp_dictoffset*/
+ (initproc)ver_init, /*tp_init*/
+ 0, /*tp_alloc*/
+ ver_new, /*tp_new*/
+ 0, /*tp_free*/
+ 0, /*tp_is_gc*/
+};
+
+
+static PyTypeObject PyUser_Type = {
+ PyVarObject_HEAD_INIT(NULL, 0)
+ "_srp.User", /*tp_name*/
+ sizeof(PyUser), /*tp_basicsize*/
+ 0, /*tp_itemsize*/
+ /* methods */
+ (destructor)usr_dealloc, /*tp_dealloc*/
+ 0, /*tp_print*/
+ 0, /*tp_getattr*/
+ 0, /*tp_setattr*/
+ 0, /*tp_compare*/
+ 0, /*tp_repr*/
+ 0, /*tp_as_number*/
+ 0, /*tp_as_sequence*/
+ 0, /*tp_as_mapping*/
+ 0, /*tp_hash*/
+ 0, /*tp_call*/
+ 0, /*tp_str*/
+ 0, /*tp_getattro*/
+ 0, /*tp_setattro*/
+ 0, /*tp_as_buffer*/
+ Py_TPFLAGS_DEFAULT, /*tp_flags*/
+ "SRP-6a User", /*tp_doc*/
+ 0, /*tp_traverse*/
+ 0, /*tp_clear*/
+ 0, /*tp_richcompare*/
+ 0, /*tp_weaklistoffset*/
+ 0, /*tp_iter*/
+ 0, /*tp_iternext*/
+ PyUser_methods, /*tp_methods*/
+ 0, /*tp_members*/
+ 0, /*tp_getset*/
+ 0, /*tp_base*/
+ 0, /*tp_dict*/
+ 0, /*tp_descr_get*/
+ 0, /*tp_descr_set*/
+ 0, /*tp_dictoffset*/
+ (initproc)usr_init, /*tp_init*/
+ 0, /*tp_alloc*/
+ usr_new, /*tp_new*/
+ 0, /*tp_free*/
+ 0, /*tp_is_gc*/
+};
+
+
+PyMODINIT_FUNC
+init_srp(void)
+{
+ int init_ok = 0;
+ PyObject *m = NULL;
+ PyObject *os = NULL;
+ PyObject *py_urandom = NULL;
+
+ os = PyImport_ImportModule("os");
+
+ if (os == NULL)
+ return;
+
+ py_urandom = PyObject_GetAttrString(os, "urandom");
+
+ if ( py_urandom && PyCallable_Check(py_urandom) )
+ {
+ PyObject *args = Py_BuildValue("(i)", 32);
+ if ( args )
+ {
+ PyObject *randstr = PyObject_CallObject(py_urandom, args);
+ if ( randstr && PyString_Check(randstr))
+ {
+ char *buff = NULL;
+ Py_ssize_t slen = 0;
+ if (!PyString_AsStringAndSize(randstr, &buff, &slen))
+ {
+ srp_init( buff, slen );
+ init_ok = 1;
+ }
+ }
+ Py_XDECREF(randstr);
+ }
+ Py_XDECREF(args);
+ }
+
+ Py_XDECREF(os);
+ Py_XDECREF(py_urandom);
+
+ if (!init_ok)
+ {
+ PyErr_SetString(PyExc_ImportError, "Initialization failed");
+ return;
+ }
+
+ if ( Py_AtExit( &srp_fini ) )
+ {
+ PyErr_SetString(PyExc_ImportError, "Failed to register atexit handler");
+ return;
+ }
+
+
+ if (PyType_Ready(&PyVerifier_Type) < 0 || PyType_Ready(&PyUser_Type))
+ return;
+
+ m = Py_InitModule3("_srp", srp_module_methods,"SRP-6a implementation");
+
+ if (m == NULL)
+ return;
+
+ Py_INCREF(&PyVerifier_Type);
+ Py_INCREF(&PyUser_Type);
+
+ PyModule_AddObject(m, "Verifier", (PyObject*) &PyVerifier_Type );
+ PyModule_AddObject(m, "User", (PyObject*) &PyUser_Type );
+} \ No newline at end of file
diff --git a/doc/conf.py b/doc/conf.py
new file mode 100644
index 0000000..7d22afa
--- /dev/null
+++ b/doc/conf.py
@@ -0,0 +1,194 @@
+# -*- coding: utf-8 -*-
+#
+# srp documentation build configuration file, created by
+# sphinx-quickstart on Mon Aug 30 23:18:19 2010.
+#
+# This file is execfile()d with the current directory set to its containing dir.
+#
+# Note that not all possible configuration values are present in this
+# autogenerated file.
+#
+# All configuration values have a default; values that are commented out
+# serve to show the default.
+
+import sys, os
+
+# If extensions (or modules to document with autodoc) are in another directory,
+# add these directories to sys.path here. If the directory is relative to the
+# documentation root, use os.path.abspath to make it absolute, like shown here.
+#sys.path.append(os.path.abspath('.'))
+
+# -- General configuration -----------------------------------------------------
+
+# Add any Sphinx extension module names here, as strings. They can be extensions
+# coming with Sphinx (named 'sphinx.ext.*') or your custom ones.
+extensions = []
+
+# Add any paths that contain templates here, relative to this directory.
+templates_path = ['_templates']
+
+# The suffix of source filenames.
+source_suffix = '.rst'
+
+# The encoding of source files.
+#source_encoding = 'utf-8'
+
+# The master toctree document.
+master_doc = 'srp'
+
+# General information about the project.
+project = u'srp'
+copyright = u'2010, Tom Cocagne'
+
+# The version info for the project you're documenting, acts as replacement for
+# |version| and |release|, also used in various other places throughout the
+# built documents.
+#
+# The short X.Y version.
+version = '0.9'
+# The full version, including alpha/beta/rc tags.
+release = '0.9'
+
+# The language for content autogenerated by Sphinx. Refer to documentation
+# for a list of supported languages.
+#language = None
+
+# There are two options for replacing |today|: either, you set today to some
+# non-false value, then it is used:
+#today = ''
+# Else, today_fmt is used as the format for a strftime call.
+#today_fmt = '%B %d, %Y'
+
+# List of documents that shouldn't be included in the build.
+#unused_docs = []
+
+# List of directories, relative to source directory, that shouldn't be searched
+# for source files.
+exclude_trees = ['_build']
+
+# The reST default role (used for this markup: `text`) to use for all documents.
+#default_role = None
+
+# If true, '()' will be appended to :func: etc. cross-reference text.
+#add_function_parentheses = True
+
+# If true, the current module name will be prepended to all description
+# unit titles (such as .. function::).
+#add_module_names = True
+
+# If true, sectionauthor and moduleauthor directives will be shown in the
+# output. They are ignored by default.
+#show_authors = False
+
+# The name of the Pygments (syntax highlighting) style to use.
+pygments_style = 'sphinx'
+
+# A list of ignored prefixes for module index sorting.
+#modindex_common_prefix = []
+
+
+# -- Options for HTML output ---------------------------------------------------
+
+# The theme to use for HTML and HTML Help pages. Major themes that come with
+# Sphinx are currently 'default' and 'sphinxdoc'.
+html_theme = 'default'
+
+# Theme options are theme-specific and customize the look and feel of a theme
+# further. For a list of options available for each theme, see the
+# documentation.
+#html_theme_options = {}
+
+# Add any paths that contain custom themes here, relative to this directory.
+#html_theme_path = []
+
+# The name for this set of Sphinx documents. If None, it defaults to
+# "<project> v<release> documentation".
+#html_title = None
+
+# A shorter title for the navigation bar. Default is the same as html_title.
+#html_short_title = None
+
+# The name of an image file (relative to this directory) to place at the top
+# of the sidebar.
+#html_logo = None
+
+# The name of an image file (within the static path) to use as favicon of the
+# docs. This file should be a Windows icon file (.ico) being 16x16 or 32x32
+# pixels large.
+#html_favicon = None
+
+# Add any paths that contain custom static files (such as style sheets) here,
+# relative to this directory. They are copied after the builtin static files,
+# so a file named "default.css" will overwrite the builtin "default.css".
+html_static_path = ['_static']
+
+# If not '', a 'Last updated on:' timestamp is inserted at every page bottom,
+# using the given strftime format.
+#html_last_updated_fmt = '%b %d, %Y'
+
+# If true, SmartyPants will be used to convert quotes and dashes to
+# typographically correct entities.
+#html_use_smartypants = True
+
+# Custom sidebar templates, maps document names to template names.
+#html_sidebars = {}
+
+# Additional templates that should be rendered to pages, maps page names to
+# template names.
+#html_additional_pages = {}
+
+# If false, no module index is generated.
+#html_use_modindex = True
+
+# If false, no index is generated.
+#html_use_index = True
+
+# If true, the index is split into individual pages for each letter.
+#html_split_index = False
+
+# If true, links to the reST sources are added to the pages.
+#html_show_sourcelink = True
+
+# If true, an OpenSearch description file will be output, and all pages will
+# contain a <link> tag referring to it. The value of this option must be the
+# base URL from which the finished HTML is served.
+#html_use_opensearch = ''
+
+# If nonempty, this is the file name suffix for HTML files (e.g. ".xhtml").
+#html_file_suffix = ''
+
+# Output file base name for HTML help builder.
+htmlhelp_basename = 'srpdoc'
+
+
+# -- Options for LaTeX output --------------------------------------------------
+
+# The paper size ('letter' or 'a4').
+#latex_paper_size = 'letter'
+
+# The font size ('10pt', '11pt' or '12pt').
+#latex_font_size = '10pt'
+
+# Grouping the document tree into LaTeX files. List of tuples
+# (source start file, target name, title, author, documentclass [howto/manual]).
+latex_documents = [
+ ('srp', 'srp.tex', u'srp Documentation',
+ u'Tom Cocagne', 'manual'),
+]
+
+# The name of an image file (relative to this directory) to place at the top of
+# the title page.
+#latex_logo = None
+
+# For "manual" documents, if this is true, then toplevel headings are parts,
+# not chapters.
+#latex_use_parts = False
+
+# Additional stuff for the LaTeX preamble.
+#latex_preamble = ''
+
+# Documents to append as an appendix to all manuals.
+#latex_appendices = []
+
+# If false, no module index is generated.
+#latex_use_modindex = True
diff --git a/doc/srp.rst b/doc/srp.rst
new file mode 100644
index 0000000..8cfd780
--- /dev/null
+++ b/doc/srp.rst
@@ -0,0 +1,127 @@
+:mod:`srp` --- Secure Remote Password
+=====================================
+
+.. module:: srp
+ :synopsis: Secure Remote Password
+
+.. moduleauthor:: Tom Cocagne <tom.cocagne@gmail.com>
+
+.. sectionauthor:: Tom Cocagne <tom.cocagne@gmail.com>
+
+
+This module provides an implementation of the Secure Remote Password
+Protocol. It may be used for secure, mutual authentication across an
+unsecured network connection. With SRP, the user's password is never
+sent across the network and a successful authentication results in a
+cryptographically secure shared key that may be used for symmetric key
+encryption.
+
+The SRP authentication requires that the server store a salt and verification
+key that is computed from user's password. While care should be taken
+to protect the verification key from disclosure, the protocol remains
+reasonably secure even in the event that an attacker obtains it as a
+computationally infeasible brute-force dictionary attack would be required
+to derive the users password.
+
+See http://srp.stanford.edu/ for a full description of the SRP protocol.
+
+Functions
+---------
+
+.. function:: gen_sv ( username, password )
+
+ Generates a salt and verifier for the given username and password.
+ Returns (salt_bytes, verifier_bytes)
+
+
+:class:`Verifier` Objects
+-------------------------
+
+A :class:`Verifier` object is used to verify the identity of a remote
+user.
+
+.. class:: Verifier( username, bytes_s, bytes_v, bytes_A )
+
+ *username* Name of the remote user being authenticated.
+
+ *bytes_s* Salt generated by :func:`gen_sv`.
+
+ *bytes_v* Verifier generated by :func:`gen_sv`.
+
+ *bytes_A* Challenge from the remote user. Generated by
+ :meth:`User.start_authentication`
+
+ .. method:: authenticated()
+
+ Returns True if the authentication succeeded. False
+ otherwise.
+
+ .. method:: get_username()
+
+ Returns the name of the user this :class:`Verifier` object is for.
+
+ .. method:: get_session_key()
+
+ Returns the session key for an authenticated user or None if the
+ authentication failed or has not yet completed.
+
+ .. method:: get_challenge()
+
+ Returns (bytes_s, bytes_B) on success or (None, None) if
+ authentication has failed.
+
+ .. method:: verify_session( user_M )
+
+ Completes the :class:`Verifier` side of the authentication
+ process. If the authentication succeded the return result,
+ bytes_H_AMK should be returned to the remote user. On failure,
+ this method returns None.
+
+
+:class:`User` Objects
+-------------------------
+
+A :class:`User` object is used to perform mutual authentication with a
+remote :class:`Verifier`. Successful authentication requires not only
+that the :class:`User` be provided with a valid username/password but
+also that the remote :class:`Verifier` have a salt & verifier for that
+username/password pair.
+
+.. class:: User( username, password )
+
+ *username* Name of the user being authenticated.
+
+ *password* Password for the user.
+
+ .. method:: authenticated()
+
+ Returns True if authentication succeeded. False
+ otherwise.
+
+ .. method:: get_username()
+
+ Returns the username passed to the constructor.
+
+ .. method:: get_session_key()
+
+ Returns the session key if authentication succeeded or None if the
+ authentication failed or has not yet completed.
+
+ .. method:: start_authentication()
+
+ Returns (username, bytes_A). These should be passed to the
+ constructor of the remote :class:`Verifer`
+
+ .. method:: process_challenge( bytes_s, bytes_B )
+
+ Processes the challenge returned
+ by :meth:`Verifier.get_challenge` on success this method
+ returns bytes_M that should be sent
+ to :meth:`Verifier.verify_session` if authentication failed,
+ it returns None.
+
+ .. method:: verify_session( bytes_H_AMK )
+
+ Completes the :class:`User` side of the authentication
+ process. If the authentication succeded :meth:`authenticated` will
+ return True \ No newline at end of file
diff --git a/setup.py b/setup.py
new file mode 100755
index 0000000..0973908
--- /dev/null
+++ b/setup.py
@@ -0,0 +1,16 @@
+#!/usr/bin/env python
+
+from distutils.core import setup
+from distutils.extension import Extension
+
+py_modules = ['_pysrp', '_ctsrp', 'srp']
+
+ext_modules = [ Extension('_srp', ['_srp.c',], libraries = ['ssl',]), ]
+
+setup(name = 'srp',
+ version = '0.9',
+ description = 'Secure Remote Password Protocol',
+ author = 'Tom Cocagne',
+ author_email = 'tom.cocagne@gmail.com',
+ py_modules = py_modules,
+ ext_modules = ext_modules) \ No newline at end of file
diff --git a/srp.py b/srp.py
new file mode 100644
index 0000000..c9eafa5
--- /dev/null
+++ b/srp.py
@@ -0,0 +1,36 @@
+
+User = None
+Verifier = None
+gen_sv = None
+
+try:
+ import _srp
+ User = _srp.User
+ Verifier = _srp.Verifier
+ gen_sv = _srp.gen_sv
+except ImportError:
+ pass
+
+if not User:
+ try:
+ import _ctsrp
+ User = _ctsrp.User
+ Verifier = _ctsrp.Verifier
+ gen_sv = _ctsrp.gen_sv
+ except ImportError:
+ pass
+
+if not User:
+ import _pysrp
+ User = _pysrp.User
+ Verifier = _pysrp.Verifier
+ gen_sv = _pysrp.gen_sv
+
+
+
+
+
+
+
+
+ \ No newline at end of file
diff --git a/test_srp.py b/test_srp.py
new file mode 100644
index 0000000..cbfa54a
--- /dev/null
+++ b/test_srp.py
@@ -0,0 +1,76 @@
+#!/usr/bin/python
+
+NTHREADS = 2
+NTEST = 10
+
+import _pysrp
+User = _pysrp.User
+Verifier = _pysrp.Verifier
+gen_sv = _pysrp.gen_sv
+
+import _ctsrp
+#User = _ctsrp.User
+#Verifier = _ctsrp.Verifier
+#gen_sv = _ctsrp.gen_sv
+
+import _srp
+#User = _srp.User
+#Verifier = _srp.Verifier
+#gen_sv = _srp.gen_sv
+
+import srp
+#User = srp.User
+#Verifier = srp.Verifier
+#gen_sv = srp.gen_sv
+
+username = 'testuser'
+password = 'testpassword'
+
+_s, _v = gen_sv( username, password )
+
+def test_one():
+ usr = User( username, password )
+ uname, A = usr.start_authentication()
+
+ # username, A => server
+ svr = Verifier( uname, _s, _v, A )
+ s,B = svr.get_challenge()
+
+ # s,B => client
+ M = usr.process_challenge( s, B )
+
+ # M => server
+ HAMK = svr.verify_session( M )
+
+ # HAMK => client
+ usr.verify_session( HAMK )
+
+ if not svr.authenticated() or not usr.authenticated():
+ raise Exception('Authentication failed!')
+
+#---------------------------------------------------------------
+
+import time
+import thread
+
+NTESTED = 0
+
+def test_thread():
+ global NTESTED
+ while NTESTED < NTEST:
+ test_one()
+ NTESTED += 1
+
+start = time.time()
+while NTHREADS > 1:
+ thread.start_new_thread( test_thread, () )
+ NTHREADS -= 1
+test_thread()
+duration = time.time() - start
+
+# Pause briefly to ensure no background threads are still executing
+time.sleep(0.1)
+
+print 'Total time: ', duration
+print 'Time per call: ', duration/NTEST
+
generated by cgit v1.2.3 (git 2.25.1) at 2024-06-29 14:21:09 +0000