diff options
Diffstat (limited to 'extra/yassl/taocrypt/src/blowfish.cpp')
| -rw-r--r-- | extra/yassl/taocrypt/src/blowfish.cpp | 36 |
1 files changed, 25 insertions, 11 deletions
diff --git a/extra/yassl/taocrypt/src/blowfish.cpp b/extra/yassl/taocrypt/src/blowfish.cpp index 8ee2f3fe569..64e8f0a84aa 100644 --- a/extra/yassl/taocrypt/src/blowfish.cpp +++ b/extra/yassl/taocrypt/src/blowfish.cpp @@ -86,7 +86,10 @@ void Blowfish::Process(byte* out, const byte* in, word32 sz) void Blowfish::SetKey(const byte* key_string, word32 keylength, CipherDir dir) { - assert(keylength >= 4 && keylength <= 56); + if (keylength < 4) + keylength = 4; + else if (keylength > 56) + keylength = 56; unsigned i, j=0, k; word32 data, dspace[2] = {0, 0}; @@ -165,16 +168,21 @@ void Blowfish::crypt_block(const word32 in[2], word32 out[2]) const word32 left = in[0]; word32 right = in[1]; + const word32 *const s = sbox_; const word32* p = pbox_; - word32 tmp; left ^= p[0]; - BF_ROUNDS + // roll back up and use s and p index instead of just p + for (unsigned i = 0; i < ROUNDS / 2; i++) { + right ^= (((s[GETBYTE(left,3)] + s[256+GETBYTE(left,2)]) + ^ s[2*256+GETBYTE(left,1)]) + s[3*256+GETBYTE(left,0)]) + ^ p[2*i+1]; -#if ROUNDS == 20 - BF_EXTRA_ROUNDS -#endif + left ^= (((s[GETBYTE(right,3)] + s[256+GETBYTE(right,2)]) + ^ s[2*256+GETBYTE(right,1)]) + s[3*256+GETBYTE(right,0)]) + ^ p[2*i+2]; + } right ^= p[ROUNDS + 1]; @@ -188,17 +196,23 @@ typedef BlockGetAndPut<word32, BigEndian> gpBlock; void Blowfish::ProcessAndXorBlock(const byte* in, const byte* xOr, byte* out) const { - word32 tmp, left, right; + word32 left, right; + const word32 *const s = sbox_; const word32* p = pbox_; gpBlock::Get(in)(left)(right); left ^= p[0]; - BF_ROUNDS + // roll back up and use s and p index instead of just p + for (unsigned i = 0; i < ROUNDS / 2; i++) { + right ^= (((s[GETBYTE(left,3)] + s[256+GETBYTE(left,2)]) + ^ s[2*256+GETBYTE(left,1)]) + s[3*256+GETBYTE(left,0)]) + ^ p[2*i+1]; -#if ROUNDS == 20 - BF_EXTRA_ROUNDS -#endif + left ^= (((s[GETBYTE(right,3)] + s[256+GETBYTE(right,2)]) + ^ s[2*256+GETBYTE(right,1)]) + s[3*256+GETBYTE(right,0)]) + ^ p[2*i+2]; + } right ^= p[ROUNDS + 1]; |