diff options
author | Brandon Wiley <brandon@blanu.net> | 2016-11-15 15:09:06 -0600 |
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committer | Brandon Wiley <brandon@blanu.net> | 2016-11-15 15:09:06 -0600 |
commit | 730f4bd72f111da13dd7d68fb350aea98f4c19bf (patch) | |
tree | 998c36bfcc8fff286654823ca5d60ccd580d4332 /common/drbg | |
parent | 8a7de7e1e252a73d786bafab042eedde8c025ad6 (diff) |
Fixed import paths to use shapeshifter-dispatcher/shapeshifter-transports instead of obfs4
Diffstat (limited to 'common/drbg')
-rw-r--r-- | common/drbg/hash_drbg.go | 149 |
1 files changed, 0 insertions, 149 deletions
diff --git a/common/drbg/hash_drbg.go b/common/drbg/hash_drbg.go deleted file mode 100644 index cc4e8b9..0000000 --- a/common/drbg/hash_drbg.go +++ /dev/null @@ -1,149 +0,0 @@ -/* - * Copyright (c) 2014, Yawning Angel <yawning at torproject dot org> - * All rights reserved. - * - * Redistribution and use in source and binary forms, with or without - * modification, are permitted provided that the following conditions are met: - * - * * Redistributions of source code must retain the above copyright notice, - * this list of conditions and the following disclaimer. - * - * * 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. - * - * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "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 COPYRIGHT HOLDER 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. - */ - -// Package drbg implements a minimalistic DRBG based off SipHash-2-4 in OFB -// mode. -package drbg - -import ( - "encoding/binary" - "encoding/hex" - "fmt" - "hash" - - "github.com/dchest/siphash" - - "github.com/OperatorFoundation/obfs4/common/csrand" -) - -// Size is the length of the HashDrbg output. -const Size = siphash.Size - -// SeedLength is the length of the HashDrbg seed. -const SeedLength = 16 + Size - -// Seed is the initial state for a HashDrbg. It consists of a SipHash-2-4 -// key, and 8 bytes of initial data. -type Seed [SeedLength]byte - -// Bytes returns a pointer to the raw HashDrbg seed. -func (seed *Seed) Bytes() *[SeedLength]byte { - return (*[SeedLength]byte)(seed) -} - -// Hex returns the hexdecimal representation of the seed. -func (seed *Seed) Hex() string { - return hex.EncodeToString(seed.Bytes()[:]) -} - -// NewSeed returns a Seed initialized with the runtime CSPRNG. -func NewSeed() (seed *Seed, err error) { - seed = new(Seed) - if err = csrand.Bytes(seed.Bytes()[:]); err != nil { - return nil, err - } - - return -} - -// SeedFromBytes creates a Seed from the raw bytes, truncating to SeedLength as -// appropriate. -func SeedFromBytes(src []byte) (seed *Seed, err error) { - if len(src) < SeedLength { - return nil, InvalidSeedLengthError(len(src)) - } - - seed = new(Seed) - copy(seed.Bytes()[:], src) - - return -} - -// SeedFromHex creates a Seed from the hexdecimal representation, truncating to -// SeedLength as appropriate. -func SeedFromHex(encoded string) (seed *Seed, err error) { - var raw []byte - if raw, err = hex.DecodeString(encoded); err != nil { - return nil, err - } - - return SeedFromBytes(raw) -} - -// InvalidSeedLengthError is the error returned when the seed provided to the -// DRBG is an invalid length. -type InvalidSeedLengthError int - -func (e InvalidSeedLengthError) Error() string { - return fmt.Sprintf("invalid seed length: %d", int(e)) -} - -// HashDrbg is a CSDRBG based off of SipHash-2-4 in OFB mode. -type HashDrbg struct { - sip hash.Hash64 - ofb [Size]byte -} - -// NewHashDrbg makes a HashDrbg instance based off an optional seed. The seed -// is truncated to SeedLength. -func NewHashDrbg(seed *Seed) (*HashDrbg, error) { - drbg := new(HashDrbg) - if seed == nil { - var err error - if seed, err = NewSeed(); err != nil { - return nil, err - } - } - drbg.sip = siphash.New(seed.Bytes()[:16]) - copy(drbg.ofb[:], seed.Bytes()[16:]) - - return drbg, nil -} - -// Int63 returns a uniformly distributed random integer [0, 1 << 63). -func (drbg *HashDrbg) Int63() int64 { - block := drbg.NextBlock() - ret := binary.BigEndian.Uint64(block) - ret &= (1<<63 - 1) - - return int64(ret) -} - -// Seed does nothing, call NewHashDrbg if you want to reseed. -func (drbg *HashDrbg) Seed(seed int64) { - // No-op. -} - -// NextBlock returns the next 8 byte DRBG block. -func (drbg *HashDrbg) NextBlock() []byte { - drbg.sip.Write(drbg.ofb[:]) - copy(drbg.ofb[:], drbg.sip.Sum(nil)) - - ret := make([]byte, Size) - copy(ret, drbg.ofb[:]) - return ret -} |