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Diffstat (limited to '')
| -rw-r--r-- | CryptoPP/shacal2.cpp | 140 |
1 files changed, 140 insertions, 0 deletions
diff --git a/CryptoPP/shacal2.cpp b/CryptoPP/shacal2.cpp new file mode 100644 index 000000000..b0360e404 --- /dev/null +++ b/CryptoPP/shacal2.cpp @@ -0,0 +1,140 @@ +// shacal2.cpp - by Kevin Springle, 2003 +// +// Portions of this code were derived from +// Wei Dai's implementation of SHA-2 +// +// The original code and all modifications are in the public domain. + +#include "pch.h" +#include "shacal2.h" +#include "misc.h" + +NAMESPACE_BEGIN(CryptoPP) + +// SHACAL-2 function and round definitions + +#define S0(x) (rotrFixed(x,2)^rotrFixed(x,13)^rotrFixed(x,22)) +#define S1(x) (rotrFixed(x,6)^rotrFixed(x,11)^rotrFixed(x,25)) +#define s0(x) (rotrFixed(x,7)^rotrFixed(x,18)^(x>>3)) +#define s1(x) (rotrFixed(x,17)^rotrFixed(x,19)^(x>>10)) + +#define Ch(x,y,z) (z^(x&(y^z))) +#define Maj(x,y,z) ((x&y)|(z&(x|y))) + +/* R is the SHA-256 round function. */ +/* This macro increments the k argument as a side effect. */ +#define R(a,b,c,d,e,f,g,h,k) \ + h+=S1(e)+Ch(e,f,g)+*k++;d+=h;h+=S0(a)+Maj(a,b,c); + +/* P is the inverse of the SHA-256 round function. */ +/* This macro decrements the k argument as a side effect. */ +#define P(a,b,c,d,e,f,g,h,k) \ + h-=S0(a)+Maj(a,b,c);d-=h;h-=S1(e)+Ch(e,f,g)+*--k; + +void SHACAL2::Base::UncheckedSetKey(const byte *userKey, unsigned int keylen, const NameValuePairs &) +{ + AssertValidKeyLength(keylen); + + word32 *rk = m_key; + unsigned int i; + + GetUserKey(BIG_ENDIAN_ORDER, rk, m_key.size(), userKey, keylen); + for (i = 0; i < 48; i++, rk++) + { + rk[16] = rk[0] + s0(rk[1]) + rk[9] + s1(rk[14]); + rk[0] += K[i]; + } + for (i = 48; i < 64; i++, rk++) + { + rk[0] += K[i]; + } +} + +typedef BlockGetAndPut<word32, BigEndian> Block; + +void SHACAL2::Enc::ProcessAndXorBlock(const byte *inBlock, const byte *xorBlock, byte *outBlock) const +{ + word32 a, b, c, d, e, f, g, h; + const word32 *rk = m_key; + + /* + * map byte array block to cipher state: + */ + Block::Get(inBlock)(a)(b)(c)(d)(e)(f)(g)(h); + + // Perform SHA-256 transformation. + + /* 64 operations, partially loop unrolled */ + for (unsigned int j=0; j<64; j+=8) + { + R(a,b,c,d,e,f,g,h,rk); + R(h,a,b,c,d,e,f,g,rk); + R(g,h,a,b,c,d,e,f,rk); + R(f,g,h,a,b,c,d,e,rk); + R(e,f,g,h,a,b,c,d,rk); + R(d,e,f,g,h,a,b,c,rk); + R(c,d,e,f,g,h,a,b,rk); + R(b,c,d,e,f,g,h,a,rk); + } + + /* + * map cipher state to byte array block: + */ + + Block::Put(xorBlock, outBlock)(a)(b)(c)(d)(e)(f)(g)(h); +} + +void SHACAL2::Dec::ProcessAndXorBlock(const byte *inBlock, const byte *xorBlock, byte *outBlock) const +{ + word32 a, b, c, d, e, f, g, h; + const word32 *rk = m_key + 64; + + /* + * map byte array block to cipher state: + */ + Block::Get(inBlock)(a)(b)(c)(d)(e)(f)(g)(h); + + // Perform inverse SHA-256 transformation. + + /* 64 operations, partially loop unrolled */ + for (unsigned int j=0; j<64; j+=8) + { + P(b,c,d,e,f,g,h,a,rk); + P(c,d,e,f,g,h,a,b,rk); + P(d,e,f,g,h,a,b,c,rk); + P(e,f,g,h,a,b,c,d,rk); + P(f,g,h,a,b,c,d,e,rk); + P(g,h,a,b,c,d,e,f,rk); + P(h,a,b,c,d,e,f,g,rk); + P(a,b,c,d,e,f,g,h,rk); + } + + /* + * map cipher state to byte array block: + */ + + Block::Put(xorBlock, outBlock)(a)(b)(c)(d)(e)(f)(g)(h); +} + +// The SHACAL-2 round constants are identical to the SHA-256 round constants. +const word32 SHACAL2::Base::K[64] = +{ + 0x428a2f98, 0x71374491, 0xb5c0fbcf, 0xe9b5dba5, + 0x3956c25b, 0x59f111f1, 0x923f82a4, 0xab1c5ed5, + 0xd807aa98, 0x12835b01, 0x243185be, 0x550c7dc3, + 0x72be5d74, 0x80deb1fe, 0x9bdc06a7, 0xc19bf174, + 0xe49b69c1, 0xefbe4786, 0x0fc19dc6, 0x240ca1cc, + 0x2de92c6f, 0x4a7484aa, 0x5cb0a9dc, 0x76f988da, + 0x983e5152, 0xa831c66d, 0xb00327c8, 0xbf597fc7, + 0xc6e00bf3, 0xd5a79147, 0x06ca6351, 0x14292967, + 0x27b70a85, 0x2e1b2138, 0x4d2c6dfc, 0x53380d13, + 0x650a7354, 0x766a0abb, 0x81c2c92e, 0x92722c85, + 0xa2bfe8a1, 0xa81a664b, 0xc24b8b70, 0xc76c51a3, + 0xd192e819, 0xd6990624, 0xf40e3585, 0x106aa070, + 0x19a4c116, 0x1e376c08, 0x2748774c, 0x34b0bcb5, + 0x391c0cb3, 0x4ed8aa4a, 0x5b9cca4f, 0x682e6ff3, + 0x748f82ee, 0x78a5636f, 0x84c87814, 0x8cc70208, + 0x90befffa, 0xa4506ceb, 0xbef9a3f7, 0xc67178f2 +}; + +NAMESPACE_END |