278 lines
11 KiB
C
278 lines
11 KiB
C
///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
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// LibSha512
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//
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// Implementation of SHA512 hash function.
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// Original author: Tom St Denis, tomstdenis@gmail.com, http://libtom.org
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// Modified by WaterJuice retaining Public Domain license.
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//
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// This is free and unencumbered software released into the public domain - June 2013 waterjuice.org
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///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
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///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
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// IMPORTS
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///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
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#include "LibSha512.h"
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#include <memory.h>
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///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
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// MACROS
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///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
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#define ROR64( value, bits ) (((value) >> (bits)) | ((value) << (64 - (bits))))
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#define MIN( x, y ) ( ((x)<(y))?(x):(y) )
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#define LOAD64H( x, y ) \
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{ x = (((uint64_t)((y)[0] & 255))<<56)|(((uint64_t)((y)[1] & 255))<<48) | \
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(((uint64_t)((y)[2] & 255))<<40)|(((uint64_t)((y)[3] & 255))<<32) | \
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(((uint64_t)((y)[4] & 255))<<24)|(((uint64_t)((y)[5] & 255))<<16) | \
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(((uint64_t)((y)[6] & 255))<<8)|(((uint64_t)((y)[7] & 255))); }
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#define STORE64H( x, y ) \
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{ (y)[0] = (uint8_t)(((x)>>56)&255); (y)[1] = (uint8_t)(((x)>>48)&255); \
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(y)[2] = (uint8_t)(((x)>>40)&255); (y)[3] = (uint8_t)(((x)>>32)&255); \
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(y)[4] = (uint8_t)(((x)>>24)&255); (y)[5] = (uint8_t)(((x)>>16)&255); \
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(y)[6] = (uint8_t)(((x)>>8)&255); (y)[7] = (uint8_t)((x)&255); }
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///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
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// CONSTANTS
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///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
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// The K array
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static const uint64_t K[80] = {
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0x428a2f98d728ae22ULL, 0x7137449123ef65cdULL, 0xb5c0fbcfec4d3b2fULL, 0xe9b5dba58189dbbcULL,
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0x3956c25bf348b538ULL, 0x59f111f1b605d019ULL, 0x923f82a4af194f9bULL, 0xab1c5ed5da6d8118ULL,
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0xd807aa98a3030242ULL, 0x12835b0145706fbeULL, 0x243185be4ee4b28cULL, 0x550c7dc3d5ffb4e2ULL,
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0x72be5d74f27b896fULL, 0x80deb1fe3b1696b1ULL, 0x9bdc06a725c71235ULL, 0xc19bf174cf692694ULL,
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0xe49b69c19ef14ad2ULL, 0xefbe4786384f25e3ULL, 0x0fc19dc68b8cd5b5ULL, 0x240ca1cc77ac9c65ULL,
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0x2de92c6f592b0275ULL, 0x4a7484aa6ea6e483ULL, 0x5cb0a9dcbd41fbd4ULL, 0x76f988da831153b5ULL,
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0x983e5152ee66dfabULL, 0xa831c66d2db43210ULL, 0xb00327c898fb213fULL, 0xbf597fc7beef0ee4ULL,
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0xc6e00bf33da88fc2ULL, 0xd5a79147930aa725ULL, 0x06ca6351e003826fULL, 0x142929670a0e6e70ULL,
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0x27b70a8546d22ffcULL, 0x2e1b21385c26c926ULL, 0x4d2c6dfc5ac42aedULL, 0x53380d139d95b3dfULL,
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0x650a73548baf63deULL, 0x766a0abb3c77b2a8ULL, 0x81c2c92e47edaee6ULL, 0x92722c851482353bULL,
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0xa2bfe8a14cf10364ULL, 0xa81a664bbc423001ULL, 0xc24b8b70d0f89791ULL, 0xc76c51a30654be30ULL,
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0xd192e819d6ef5218ULL, 0xd69906245565a910ULL, 0xf40e35855771202aULL, 0x106aa07032bbd1b8ULL,
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0x19a4c116b8d2d0c8ULL, 0x1e376c085141ab53ULL, 0x2748774cdf8eeb99ULL, 0x34b0bcb5e19b48a8ULL,
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0x391c0cb3c5c95a63ULL, 0x4ed8aa4ae3418acbULL, 0x5b9cca4f7763e373ULL, 0x682e6ff3d6b2b8a3ULL,
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0x748f82ee5defb2fcULL, 0x78a5636f43172f60ULL, 0x84c87814a1f0ab72ULL, 0x8cc702081a6439ecULL,
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0x90befffa23631e28ULL, 0xa4506cebde82bde9ULL, 0xbef9a3f7b2c67915ULL, 0xc67178f2e372532bULL,
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0xca273eceea26619cULL, 0xd186b8c721c0c207ULL, 0xeada7dd6cde0eb1eULL, 0xf57d4f7fee6ed178ULL,
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0x06f067aa72176fbaULL, 0x0a637dc5a2c898a6ULL, 0x113f9804bef90daeULL, 0x1b710b35131c471bULL,
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0x28db77f523047d84ULL, 0x32caab7b40c72493ULL, 0x3c9ebe0a15c9bebcULL, 0x431d67c49c100d4cULL,
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0x4cc5d4becb3e42b6ULL, 0x597f299cfc657e2aULL, 0x5fcb6fab3ad6faecULL, 0x6c44198c4a475817ULL
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};
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#define BLOCK_SIZE 128
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///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
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// INTERNAL FUNCTIONS
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///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
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// Various logical functions
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#define Ch( x, y, z ) (z ^ (x & (y ^ z)))
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#define Maj(x, y, z ) (((x | y) & z) | (x & y))
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#define S( x, n ) ROR64( x, n )
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#define R( x, n ) (((x)&0xFFFFFFFFFFFFFFFFULL)>>((uint64_t)n))
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#define Sigma0( x ) (S(x, 28) ^ S(x, 34) ^ S(x, 39))
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#define Sigma1( x ) (S(x, 14) ^ S(x, 18) ^ S(x, 41))
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#define Gamma0( x ) (S(x, 1) ^ S(x, 8) ^ R(x, 7))
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#define Gamma1( x ) (S(x, 19) ^ S(x, 61) ^ R(x, 6))
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#define Sha512Round( a, b, c, d, e, f, g, h, i ) \
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t0 = h + Sigma1(e) + Ch(e, f, g) + K[i] + W[i]; \
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t1 = Sigma0(a) + Maj(a, b, c); \
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d += t0; \
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h = t0 + t1;
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///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
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// TransformFunction
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//
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// Compress 1024-bits
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///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
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static
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void
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TransformFunction
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(
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Sha512Context* Context,
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uint8_t* Buffer
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)
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{
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uint64_t S[8];
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uint64_t W[80];
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uint64_t t0;
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uint64_t t1;
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int i;
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// Copy state into S
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for( i=0; i<8; i++ )
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{
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S[i] = Context->state[i];
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}
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// Copy the state into 1024-bits into W[0..15]
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for( i=0; i<16; i++ )
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{
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LOAD64H(W[i], Buffer + (8*i));
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}
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// Fill W[16..79]
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for( i=16; i<80; i++ )
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{
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W[i] = Gamma1(W[i - 2]) + W[i - 7] + Gamma0(W[i - 15]) + W[i - 16];
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}
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// Compress
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for( i=0; i<80; i+=8 )
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{
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Sha512Round(S[0],S[1],S[2],S[3],S[4],S[5],S[6],S[7],i+0);
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Sha512Round(S[7],S[0],S[1],S[2],S[3],S[4],S[5],S[6],i+1);
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Sha512Round(S[6],S[7],S[0],S[1],S[2],S[3],S[4],S[5],i+2);
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Sha512Round(S[5],S[6],S[7],S[0],S[1],S[2],S[3],S[4],i+3);
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Sha512Round(S[4],S[5],S[6],S[7],S[0],S[1],S[2],S[3],i+4);
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Sha512Round(S[3],S[4],S[5],S[6],S[7],S[0],S[1],S[2],i+5);
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Sha512Round(S[2],S[3],S[4],S[5],S[6],S[7],S[0],S[1],i+6);
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Sha512Round(S[1],S[2],S[3],S[4],S[5],S[6],S[7],S[0],i+7);
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}
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// Feedback
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for( i=0; i<8; i++ )
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{
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Context->state[i] = Context->state[i] + S[i];
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}
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}
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///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
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// PUBLIC FUNCTIONS
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///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
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///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
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// Sha512Initialise
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//
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// Initialises a SHA512 Context. Use this to initialise/reset a context.
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///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
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void
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Sha512Initialise
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(
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Sha512Context* Context
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)
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{
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Context->curlen = 0;
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Context->length = 0;
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Context->state[0] = 0x6a09e667f3bcc908ULL;
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Context->state[1] = 0xbb67ae8584caa73bULL;
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Context->state[2] = 0x3c6ef372fe94f82bULL;
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Context->state[3] = 0xa54ff53a5f1d36f1ULL;
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Context->state[4] = 0x510e527fade682d1ULL;
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Context->state[5] = 0x9b05688c2b3e6c1fULL;
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Context->state[6] = 0x1f83d9abfb41bd6bULL;
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Context->state[7] = 0x5be0cd19137e2179ULL;
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}
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///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
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// Sha512Update
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//
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// Adds data to the SHA512 context. This will process the data and update the internal state of the context. Keep on
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// calling this function until all the data has been added. Then call Sha512Finalise to calculate the hash.
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///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
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void
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Sha512Update
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(
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Sha512Context* Context,
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void* Buffer,
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uint32_t BufferSize
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)
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{
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uint32_t n;
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if( Context->curlen > sizeof(Context->buf) )
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{
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return;
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}
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while( BufferSize > 0 )
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{
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if( Context->curlen == 0 && BufferSize >= BLOCK_SIZE )
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{
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TransformFunction( Context, (uint8_t *)Buffer );
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Context->length += BLOCK_SIZE * 8;
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Buffer = (uint8_t*)Buffer + BLOCK_SIZE;
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BufferSize -= BLOCK_SIZE;
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}
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else
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{
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n = MIN( BufferSize, (BLOCK_SIZE - Context->curlen) );
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memcpy( Context->buf + Context->curlen, Buffer, (size_t)n );
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Context->curlen += n;
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Buffer = (uint8_t*)Buffer + n;
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BufferSize -= n;
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if( Context->curlen == BLOCK_SIZE )
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{
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TransformFunction( Context, Context->buf );
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Context->length += 8*BLOCK_SIZE;
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Context->curlen = 0;
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}
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}
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}
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}
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///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
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// Sha512Finalise
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//
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// Performs the final calculation of the hash and returns the digest (64 byte buffer containing 512bit hash). After
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// calling this, Sha512Initialised must be used to reuse the context.
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///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
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void
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Sha512Finalise
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(
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Sha512Context* Context,
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SHA512_HASH* Digest
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)
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{
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int i;
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if( Context->curlen >= sizeof(Context->buf) )
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{
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return;
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}
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// Increase the length of the message
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Context->length += Context->curlen * 8ULL;
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// Append the '1' bit
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Context->buf[Context->curlen++] = (uint8_t)0x80;
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// If the length is currently above 112 bytes we append zeros
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// then compress. Then we can fall back to padding zeros and length
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// encoding like normal.
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if( Context->curlen > 112 )
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{
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while( Context->curlen < 128 )
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{
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Context->buf[Context->curlen++] = (uint8_t)0;
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}
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TransformFunction( Context, Context->buf );
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Context->curlen = 0;
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}
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// Pad up to 120 bytes of zeroes
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// note: that from 112 to 120 is the 64 MSB of the length. We assume that you won't hash
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// > 2^64 bits of data... :-)
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while( Context->curlen < 120 )
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{
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Context->buf[Context->curlen++] = (uint8_t)0;
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}
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// Store length
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STORE64H( Context->length, Context->buf+120 );
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TransformFunction( Context, Context->buf );
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// Copy output
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for( i=0; i<8; i++ )
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{
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STORE64H( Context->state[i], Digest->bytes+(8*i) );
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}
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}
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