Initial import

1 files changed, 494 insertions, 0 deletions

diff --git a/openssl/crypto/bn/bn_prime.c b/openssl/crypto/bn/bn_prime.c
new file mode 100644
index 00000000..7b25979d
--- /dev/null
+++ b/openssl/crypto/bn/bn_prime.c
@@ -0,0 +1,494 @@
+/* crypto/bn/bn_prime.c */
+/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
+ * All rights reserved.
+ *
+ * This package is an SSL implementation written
+ * by Eric Young (eay@cryptsoft.com).
+ * The implementation was written so as to conform with Netscapes SSL.
+ * 
+ * This library is free for commercial and non-commercial use as long as
+ * the following conditions are aheared to.  The following conditions
+ * apply to all code found in this distribution, be it the RC4, RSA,
+ * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
+ * included with this distribution is covered by the same copyright terms
+ * except that the holder is Tim Hudson (tjh@cryptsoft.com).
+ * 
+ * Copyright remains Eric Young's, and as such any Copyright notices in
+ * the code are not to be removed.
+ * If this package is used in a product, Eric Young should be given attribution
+ * as the author of the parts of the library used.
+ * This can be in the form of a textual message at program startup or
+ * in documentation (online or textual) provided with the package.
+ * 
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. All advertising materials mentioning features or use of this software
+ *    must display the following acknowledgement:
+ *    "This product includes cryptographic software written by
+ *     Eric Young (eay@cryptsoft.com)"
+ *    The word 'cryptographic' can be left out if the rouines from the library
+ *    being used are not cryptographic related :-).
+ * 4. If you include any Windows specific code (or a derivative thereof) from 
+ *    the apps directory (application code) you must include an acknowledgement:
+ *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
+ * 
+ * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ * 
+ * The licence and distribution terms for any publically available version or
+ * derivative of this code cannot be changed.  i.e. this code cannot simply be
+ * copied and put under another distribution licence
+ * [including the GNU Public Licence.]
+ */
+/* ====================================================================
+ * Copyright (c) 1998-2001 The OpenSSL Project.  All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer. 
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ *
+ * 3. All advertising materials mentioning features or use of this
+ *    software must display the following acknowledgment:
+ *    "This product includes software developed by the OpenSSL Project
+ *    for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
+ *
+ * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
+ *    endorse or promote products derived from this software without
+ *    prior written permission. For written permission, please contact
+ *    openssl-core@openssl.org.
+ *
+ * 5. Products derived from this software may not be called "OpenSSL"
+ *    nor may "OpenSSL" appear in their names without prior written
+ *    permission of the OpenSSL Project.
+ *
+ * 6. Redistributions of any form whatsoever must retain the following
+ *    acknowledgment:
+ *    "This product includes software developed by the OpenSSL Project
+ *    for use in the OpenSSL Toolkit (http://www.openssl.org/)"
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
+ * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
+ * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
+ * OF THE POSSIBILITY OF SUCH DAMAGE.
+ * ====================================================================
+ *
+ * This product includes cryptographic software written by Eric Young
+ * (eay@cryptsoft.com).  This product includes software written by Tim
+ * Hudson (tjh@cryptsoft.com).
+ *
+ */
+
+#include <stdio.h>
+#include <time.h>
+#include "cryptlib.h"
+#include "bn_lcl.h"
+#include <openssl/rand.h>
+
+/* NB: these functions have been "upgraded", the deprecated versions (which are
+ * compatibility wrappers using these functions) are in bn_depr.c.
+ * - Geoff
+ */
+
+/* The quick sieve algorithm approach to weeding out primes is
+ * Philip Zimmermann's, as implemented in PGP.  I have had a read of
+ * his comments and implemented my own version.
+ */
+#include "bn_prime.h"
+
+static int witness(BIGNUM *w, const BIGNUM *a, const BIGNUM *a1,
+	const BIGNUM *a1_odd, int k, BN_CTX *ctx, BN_MONT_CTX *mont);
+static int probable_prime(BIGNUM *rnd, int bits);
+static int probable_prime_dh(BIGNUM *rnd, int bits,
+	const BIGNUM *add, const BIGNUM *rem, BN_CTX *ctx);
+static int probable_prime_dh_safe(BIGNUM *rnd, int bits,
+	const BIGNUM *add, const BIGNUM *rem, BN_CTX *ctx);
+
+int BN_GENCB_call(BN_GENCB *cb, int a, int b)
+	{
+	/* No callback means continue */
+	if(!cb) return 1;
+	switch(cb->ver)
+		{
+	case 1:
+		/* Deprecated-style callbacks */
+		if(!cb->cb.cb_1)
+			return 1;
+		cb->cb.cb_1(a, b, cb->arg);
+		return 1;
+	case 2:
+		/* New-style callbacks */
+		return cb->cb.cb_2(a, b, cb);
+	default:
+		break;
+		}
+	/* Unrecognised callback type */
+	return 0;
+	}
+
+int BN_generate_prime_ex(BIGNUM *ret, int bits, int safe,
+	const BIGNUM *add, const BIGNUM *rem, BN_GENCB *cb)
+	{
+	BIGNUM *t;
+	int found=0;
+	int i,j,c1=0;
+	BN_CTX *ctx;
+	int checks = BN_prime_checks_for_size(bits);
+
+	ctx=BN_CTX_new();
+	if (ctx == NULL) goto err;
+	BN_CTX_start(ctx);
+	t = BN_CTX_get(ctx);
+	if(!t) goto err;
+loop: 
+	/* make a random number and set the top and bottom bits */
+	if (add == NULL)
+		{
+		if (!probable_prime(ret,bits)) goto err;
+		}
+	else
+		{
+		if (safe)
+			{
+			if (!probable_prime_dh_safe(ret,bits,add,rem,ctx))
+				 goto err;
+			}
+		else
+			{
+			if (!probable_prime_dh(ret,bits,add,rem,ctx))
+				goto err;
+			}
+		}
+	/* if (BN_mod_word(ret,(BN_ULONG)3) == 1) goto loop; */
+	if(!BN_GENCB_call(cb, 0, c1++))
+		/* aborted */
+		goto err;
+
+	if (!safe)
+		{
+		i=BN_is_prime_fasttest_ex(ret,checks,ctx,0,cb);
+		if (i == -1) goto err;
+		if (i == 0) goto loop;
+		}
+	else
+		{
+		/* for "safe prime" generation,
+		 * check that (p-1)/2 is prime.
+		 * Since a prime is odd, We just
+		 * need to divide by 2 */
+		if (!BN_rshift1(t,ret)) goto err;
+
+		for (i=0; i<checks; i++)
+			{
+			j=BN_is_prime_fasttest_ex(ret,1,ctx,0,cb);
+			if (j == -1) goto err;
+			if (j == 0) goto loop;
+
+			j=BN_is_prime_fasttest_ex(t,1,ctx,0,cb);
+			if (j == -1) goto err;
+			if (j == 0) goto loop;
+
+			if(!BN_GENCB_call(cb, 2, c1-1))
+				goto err;
+			/* We have a safe prime test pass */
+			}
+		}
+	/* we have a prime :-) */
+	found = 1;
+err:
+	if (ctx != NULL)
+		{
+		BN_CTX_end(ctx);
+		BN_CTX_free(ctx);
+		}
+	bn_check_top(ret);
+	return found;
+	}
+
+int BN_is_prime_ex(const BIGNUM *a, int checks, BN_CTX *ctx_passed, BN_GENCB *cb)
+	{
+	return BN_is_prime_fasttest_ex(a, checks, ctx_passed, 0, cb);
+	}
+
+int BN_is_prime_fasttest_ex(const BIGNUM *a, int checks, BN_CTX *ctx_passed,
+		int do_trial_division, BN_GENCB *cb)
+	{
+	int i, j, ret = -1;
+	int k;
+	BN_CTX *ctx = NULL;
+	BIGNUM *A1, *A1_odd, *check; /* taken from ctx */
+	BN_MONT_CTX *mont = NULL;
+	const BIGNUM *A = NULL;
+
+	if (BN_cmp(a, BN_value_one()) <= 0)
+		return 0;
+	
+	if (checks == BN_prime_checks)
+		checks = BN_prime_checks_for_size(BN_num_bits(a));
+
+	/* first look for small factors */
+	if (!BN_is_odd(a))
+		/* a is even => a is prime if and only if a == 2 */
+		return BN_is_word(a, 2);
+	if (do_trial_division)
+		{
+		for (i = 1; i < NUMPRIMES; i++)
+			if (BN_mod_word(a, primes[i]) == 0) 
+				return 0;
+		if(!BN_GENCB_call(cb, 1, -1))
+			goto err;
+		}
+
+	if (ctx_passed != NULL)
+		ctx = ctx_passed;
+	else
+		if ((ctx=BN_CTX_new()) == NULL)
+			goto err;
+	BN_CTX_start(ctx);
+
+	/* A := abs(a) */
+	if (a->neg)
+		{
+		BIGNUM *t;
+		if ((t = BN_CTX_get(ctx)) == NULL) goto err;
+		BN_copy(t, a);
+		t->neg = 0;
+		A = t;
+		}
+	else
+		A = a;
+	A1 = BN_CTX_get(ctx);
+	A1_odd = BN_CTX_get(ctx);
+	check = BN_CTX_get(ctx);
+	if (check == NULL) goto err;
+
+	/* compute A1 := A - 1 */
+	if (!BN_copy(A1, A))
+		goto err;
+	if (!BN_sub_word(A1, 1))
+		goto err;
+	if (BN_is_zero(A1))
+		{
+		ret = 0;
+		goto err;
+		}
+
+	/* write  A1  as  A1_odd * 2^k */
+	k = 1;
+	while (!BN_is_bit_set(A1, k))
+		k++;
+	if (!BN_rshift(A1_odd, A1, k))
+		goto err;
+
+	/* Montgomery setup for computations mod A */
+	mont = BN_MONT_CTX_new();
+	if (mont == NULL)
+		goto err;
+	if (!BN_MONT_CTX_set(mont, A, ctx))
+		goto err;
+	
+	for (i = 0; i < checks; i++)
+		{
+		if (!BN_pseudo_rand_range(check, A1))
+			goto err;
+		if (!BN_add_word(check, 1))
+			goto err;
+		/* now 1 <= check < A */
+
+		j = witness(check, A, A1, A1_odd, k, ctx, mont);
+		if (j == -1) goto err;
+		if (j)
+			{
+			ret=0;
+			goto err;
+			}
+		if(!BN_GENCB_call(cb, 1, i))
+			goto err;
+		}
+	ret=1;
+err:
+	if (ctx != NULL)
+		{
+		BN_CTX_end(ctx);
+		if (ctx_passed == NULL)
+			BN_CTX_free(ctx);
+		}
+	if (mont != NULL)
+		BN_MONT_CTX_free(mont);
+
+	return(ret);
+	}
+
+static int witness(BIGNUM *w, const BIGNUM *a, const BIGNUM *a1,
+	const BIGNUM *a1_odd, int k, BN_CTX *ctx, BN_MONT_CTX *mont)
+	{
+	if (!BN_mod_exp_mont(w, w, a1_odd, a, ctx, mont)) /* w := w^a1_odd mod a */
+		return -1;
+	if (BN_is_one(w))
+		return 0; /* probably prime */
+	if (BN_cmp(w, a1) == 0)
+		return 0; /* w == -1 (mod a),  'a' is probably prime */
+	while (--k)
+		{
+		if (!BN_mod_mul(w, w, w, a, ctx)) /* w := w^2 mod a */
+			return -1;
+		if (BN_is_one(w))
+			return 1; /* 'a' is composite, otherwise a previous 'w' would
+			           * have been == -1 (mod 'a') */
+		if (BN_cmp(w, a1) == 0)
+			return 0; /* w == -1 (mod a), 'a' is probably prime */
+		}
+	/* If we get here, 'w' is the (a-1)/2-th power of the original 'w',
+	 * and it is neither -1 nor +1 -- so 'a' cannot be prime */
+	bn_check_top(w);
+	return 1;
+	}
+
+static int probable_prime(BIGNUM *rnd, int bits)
+	{
+	int i;
+	prime_t mods[NUMPRIMES];
+	BN_ULONG delta,maxdelta;
+
+again:
+	if (!BN_rand(rnd,bits,1,1)) return(0);
+	/* we now have a random number 'rand' to test. */
+	for (i=1; i<NUMPRIMES; i++)
+		mods[i]=(prime_t)BN_mod_word(rnd,(BN_ULONG)primes[i]);
+	maxdelta=BN_MASK2 - primes[NUMPRIMES-1];
+	delta=0;
+	loop: for (i=1; i<NUMPRIMES; i++)
+		{
+		/* check that rnd is not a prime and also
+		 * that gcd(rnd-1,primes) == 1 (except for 2) */
+		if (((mods[i]+delta)%primes[i]) <= 1)
+			{
+			delta+=2;
+			if (delta > maxdelta) goto again;
+			goto loop;
+			}
+		}
+	if (!BN_add_word(rnd,delta)) return(0);
+	bn_check_top(rnd);
+	return(1);
+	}
+
+static int probable_prime_dh(BIGNUM *rnd, int bits,
+	const BIGNUM *add, const BIGNUM *rem, BN_CTX *ctx)
+	{
+	int i,ret=0;
+	BIGNUM *t1;
+
+	BN_CTX_start(ctx);
+	if ((t1 = BN_CTX_get(ctx)) == NULL) goto err;
+
+	if (!BN_rand(rnd,bits,0,1)) goto err;
+
+	/* we need ((rnd-rem) % add) == 0 */
+
+	if (!BN_mod(t1,rnd,add,ctx)) goto err;
+	if (!BN_sub(rnd,rnd,t1)) goto err;
+	if (rem == NULL)
+		{ if (!BN_add_word(rnd,1)) goto err; }
+	else
+		{ if (!BN_add(rnd,rnd,rem)) goto err; }
+
+	/* we now have a random number 'rand' to test. */
+
+	loop: for (i=1; i<NUMPRIMES; i++)
+		{
+		/* check that rnd is a prime */
+		if (BN_mod_word(rnd,(BN_ULONG)primes[i]) <= 1)
+			{
+			if (!BN_add(rnd,rnd,add)) goto err;
+			goto loop;
+			}
+		}
+	ret=1;
+err:
+	BN_CTX_end(ctx);
+	bn_check_top(rnd);
+	return(ret);
+	}
+
+static int probable_prime_dh_safe(BIGNUM *p, int bits, const BIGNUM *padd,
+	const BIGNUM *rem, BN_CTX *ctx)
+	{
+	int i,ret=0;
+	BIGNUM *t1,*qadd,*q;
+
+	bits--;
+	BN_CTX_start(ctx);
+	t1 = BN_CTX_get(ctx);
+	q = BN_CTX_get(ctx);
+	qadd = BN_CTX_get(ctx);
+	if (qadd == NULL) goto err;
+
+	if (!BN_rshift1(qadd,padd)) goto err;
+		
+	if (!BN_rand(q,bits,0,1)) goto err;
+
+	/* we need ((rnd-rem) % add) == 0 */
+	if (!BN_mod(t1,q,qadd,ctx)) goto err;
+	if (!BN_sub(q,q,t1)) goto err;
+	if (rem == NULL)
+		{ if (!BN_add_word(q,1)) goto err; }
+	else
+		{
+		if (!BN_rshift1(t1,rem)) goto err;
+		if (!BN_add(q,q,t1)) goto err;
+		}
+
+	/* we now have a random number 'rand' to test. */
+	if (!BN_lshift1(p,q)) goto err;
+	if (!BN_add_word(p,1)) goto err;
+
+	loop: for (i=1; i<NUMPRIMES; i++)
+		{
+		/* check that p and q are prime */
+		/* check that for p and q
+		 * gcd(p-1,primes) == 1 (except for 2) */
+		if (	(BN_mod_word(p,(BN_ULONG)primes[i]) == 0) ||
+			(BN_mod_word(q,(BN_ULONG)primes[i]) == 0))
+			{
+			if (!BN_add(p,p,padd)) goto err;
+			if (!BN_add(q,q,qadd)) goto err;
+			goto loop;
+			}
+		}
+	ret=1;
+err:
+	BN_CTX_end(ctx);
+	bn_check_top(p);
+	return(ret);
+	}