Embedded systems coursework 2.
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Diff: hash/SHA2_64.cpp
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/hash/SHA2_64.cpp Sat Sep 14 18:21:32 2013 +0000 @@ -0,0 +1,354 @@ +#include "SHA2_64.h" +#include <string.h> + + +static const uint64_t H[] = +{ + // SHA-384 + 0xcbbb9d5dc1059ed8, 0x629a292a367cd507, 0x9159015a3070dd17, 0x152fecd8f70e5939, + 0x67332667ffc00b31, 0x8eb44a8768581511, 0xdb0c2e0d64f98fa7, 0x47b5481dbefa4fa4, + + // SHA-512 + 0x6a09e667f3bcc908, 0xbb67ae8584caa73b, 0x3c6ef372fe94f82b, 0xa54ff53a5f1d36f1, + 0x510e527fade682d1, 0x9b05688c2b3e6c1f, 0x1f83d9abfb41bd6b, 0x5be0cd19137e2179 +}; + +static uint64_t revWord(uint64_t w) +{ + return __rev(w >> 32) + | ((uint64_t)(__rev(w)) << 32); +} + +#define ROTL(W,N) (((W) << (N)) | ((W) >> (64-(N)))) +#define ROTR(W,N) (((W) >> (N)) | ((W) << (64-(N)))) +#define CH(X,Y,Z) (((X) & (Y)) ^ ((~(X)) & (Z))) +#define MAJ(X,Y,Z) (((X) & (Y)) ^ ((X) & (Z)) ^ ((Y) & (Z))) +#define BSIG0(X) (ROTR(X,28) ^ ROTR(X,34) ^ ROTR(X,39)) +#define BSIG1(X) (ROTR(X,14) ^ ROTR(X,18) ^ ROTR(X,41)) +#define SSIG0(X) (ROTR((X),1) ^ ROTR((X),8) ^ ((X) >> 7)) +#define SSIG1(X) (ROTR((X),19) ^ ROTR((X),61) ^ ((X) >> 6)) + +#define R(A,B,C,D,E,F,G,H,K,T) T1 = H + BSIG1(E) + CH(E,F,G) + K + w[T]; \ + T2 = BSIG0(A) + MAJ(A,B,C); \ + D += T1; \ + H = T1 + T2; + + +SHA2_64::SHA2_64(SHA2_64_TYPE t): +type(t), +totalBufferLength(0), +bufferLength(0) +{ + switch(type) + { + case SHA_384: + h0 = H[0]; + h1 = H[1]; + h2 = H[2]; + h3 = H[3]; + h4 = H[4]; + h5 = H[5]; + h6 = H[6]; + h7 = H[7]; + break; + + case SHA_512: + h0 = H[8]; + h1 = H[9]; + h2 = H[10]; + h3 = H[11]; + h4 = H[12]; + h5 = H[13]; + h6 = H[14]; + h7 = H[15]; + break; + } +} + +void SHA2_64::update(uint8_t *data, uint32_t length) +{ + if(length < 128-bufferLength) + { + memcpy(&buffer[bufferLength], data, length); + bufferLength += length; + totalBufferLength += length; + return; + } + int offset = 128-bufferLength; + memcpy(&buffer[bufferLength], data, offset); + computeBlock(&h0,&h1,&h2,&h3,&h4,&h5,&h6,&h7,buffer); + while(length-offset > 128) + { + memcpy(buffer, &data[offset], 128); + computeBlock(&h0,&h1,&h2,&h3,&h4,&h5,&h6,&h7,buffer); + offset += 128; + } + if(offset > length) + offset -= 128; + bufferLength = length - offset; + memcpy(buffer, &data[offset], bufferLength); + totalBufferLength += length; +} + +void SHA2_64::finalize(uint8_t *hash) +{ + uint64_t *hash2 = (uint64_t*)hash; + uint64_t lengthBit = totalBufferLength << 3; + uint32_t padding; + if(totalBufferLength % 128 < 112) + padding = 112 - (totalBufferLength % 128); + else + padding = 112 + (128 - (totalBufferLength % 128)); + + buffer[bufferLength++] = 0x80; + padding--; + if(padding+bufferLength == 112) + memset(&buffer[bufferLength], 0, padding); + else + { + memset(&buffer[bufferLength], 0, 64-bufferLength); + computeBlock(&h0, &h1, &h2, &h3, &h4, &h5, &h6, &h7, buffer); + memset(buffer, 0, 112); + } + + lengthBit = revWord(lengthBit); + memcpy(&buffer[120], &lengthBit, 8); + memset(&buffer[112], 0, 8); + computeBlock(&h0, &h1, &h2, &h3, &h4, &h5, &h6, &h7, buffer); + + + hash2[0] = revWord(h0); + hash2[1] = revWord(h1); + hash2[2] = revWord(h2); + hash2[3] = revWord(h3); + hash2[4] = revWord(h4); + hash2[5] = revWord(h5); + + + if(type == SHA_512) + { + hash2[6] = revWord(h6); + hash2[7] = revWord(h7); + } + + // reset state + switch(type) + { + case SHA_384: + h0 = H[0]; + h1 = H[1]; + h2 = H[2]; + h3 = H[3]; + h4 = H[4]; + h5 = H[5]; + h6 = H[6]; + h7 = H[7]; + break; + + case SHA_512: + h0 = H[8]; + h1 = H[9]; + h2 = H[10]; + h3 = H[11]; + h4 = H[12]; + h5 = H[13]; + h6 = H[14]; + h7 = H[15]; + break; + } + totalBufferLength = 0; + bufferLength = 0; +} + +void SHA2_64::computeHash(SHA2_64_TYPE type, uint8_t *hash, uint8_t *data, uint32_t length) +{ + uint64_t *hash2 = (uint64_t*)hash; + uint64_t lengthBit = length * 8; + uint64_t h0 = H[type*8], h1 = H[type*8+1], h2 = H[type*8+2], h3 = H[type*8+3]; + uint64_t h4 = H[type*8+4], h5 = H[type*8+5], h6 = H[type*8+6], h7 = H[type*8+7]; + + int padding; + if(length % 128 < 112) + padding = 112 - (length % 128); + else + padding = 112 + (128 - (length % 128)); + + while(length >= 128) + { + computeBlock(&h0, &h1, &h2, &h3, &h4, &h5, &h6, &h7, data); + data += 128; + length -= 128; + } + uint8_t buffer[128]; + memcpy(buffer, data,length); + buffer[length] = 0x80; + length++; + padding--; + + if(padding+length == 112) + memset(&buffer[length], 0, padding); + else + { + memset(&buffer[length], 0, 128-length); + computeBlock(&h0, &h1, &h2, &h3, &h4, &h5, &h6, &h7, buffer); + memset(buffer, 0, 112); + } + + lengthBit = revWord(lengthBit); + memset(&buffer[112], 0, 8); + memcpy(&buffer[120], &lengthBit, 8); + computeBlock(&h0, &h1, &h2, &h3, &h4, &h5, &h6, &h7, buffer); + + hash2[0] = revWord(h0); + hash2[1] = revWord(h1); + hash2[2] = revWord(h2); + hash2[3] = revWord(h3); + hash2[4] = revWord(h4); + hash2[5] = revWord(h5); + + + if(type == SHA_512) + { + hash2[6] = revWord(h6); + hash2[7] = revWord(h7); + } +} + +void SHA2_64::computeBlock(uint64_t *h02, + uint64_t *h12, + uint64_t *h22, + uint64_t *h32, + uint64_t *h42, + uint64_t *h52, + uint64_t *h62, + uint64_t *h72, + uint8_t *buffer) +{ + uint64_t w[80]; + uint64_t *buffer2 = (uint64_t*)buffer; + + w[0] = revWord(buffer2[0]); + w[1] = revWord(buffer2[1]); + w[2] = revWord(buffer2[2]); + w[3] = revWord(buffer2[3]); + w[4] = revWord(buffer2[4]); + w[5] = revWord(buffer2[5]); + w[6] = revWord(buffer2[6]); + w[7] = revWord(buffer2[7]); + w[8] = revWord(buffer2[8]); + w[9] = revWord(buffer2[9]); + w[10] = revWord(buffer2[10]); + w[11] = revWord(buffer2[11]); + w[12] = revWord(buffer2[12]); + w[13] = revWord(buffer2[13]); + w[14] = revWord(buffer2[14]); + w[15] = revWord(buffer2[15]); + + for(int t = 16; t < 80; ++t) + w[t] = SSIG1(w[t-2]) + w[t-7] + SSIG0(w[t-15]) + w[t-16]; + + uint64_t a = *h02, b = *h12, c = *h22, d = *h32, e = *h42, f = *h52, g = *h62, h = *h72; + uint64_t T1, T2; + + + R(a,b,c,d,e,f,g,h,0x428a2f98d728ae22,0) + R(h,a,b,c,d,e,f,g,0x7137449123ef65cd,1) + R(g,h,a,b,c,d,e,f,0xb5c0fbcfec4d3b2f,2) + R(f,g,h,a,b,c,d,e,0xe9b5dba58189dbbc,3) + R(e,f,g,h,a,b,c,d,0x3956c25bf348b538,4) + R(d,e,f,g,h,a,b,c,0x59f111f1b605d019,5) + R(c,d,e,f,g,h,a,b,0x923f82a4af194f9b,6) + R(b,c,d,e,f,g,h,a,0xab1c5ed5da6d8118,7) + + R(a,b,c,d,e,f,g,h,0xd807aa98a3030242,8) + R(h,a,b,c,d,e,f,g,0x12835b0145706fbe,9) + R(g,h,a,b,c,d,e,f,0x243185be4ee4b28c,10) + R(f,g,h,a,b,c,d,e,0x550c7dc3d5ffb4e2,11) + R(e,f,g,h,a,b,c,d,0x72be5d74f27b896f,12) + R(d,e,f,g,h,a,b,c,0x80deb1fe3b1696b1,13) + R(c,d,e,f,g,h,a,b,0x9bdc06a725c71235,14) + R(b,c,d,e,f,g,h,a,0xc19bf174cf692694,15) + + + R(a,b,c,d,e,f,g,h,0xe49b69c19ef14ad2,16) + R(h,a,b,c,d,e,f,g,0xefbe4786384f25e3,17) + R(g,h,a,b,c,d,e,f,0x0fc19dc68b8cd5b5,18) + R(f,g,h,a,b,c,d,e,0x240ca1cc77ac9c65,19) + R(e,f,g,h,a,b,c,d,0x2de92c6f592b0275,20) + R(d,e,f,g,h,a,b,c,0x4a7484aa6ea6e483,21) + R(c,d,e,f,g,h,a,b,0x5cb0a9dcbd41fbd4,22) + R(b,c,d,e,f,g,h,a,0x76f988da831153b5,23) + + R(a,b,c,d,e,f,g,h,0x983e5152ee66dfab,24) + R(h,a,b,c,d,e,f,g,0xa831c66d2db43210,25) + R(g,h,a,b,c,d,e,f,0xb00327c898fb213f,26) + R(f,g,h,a,b,c,d,e,0xbf597fc7beef0ee4,27) + R(e,f,g,h,a,b,c,d,0xc6e00bf33da88fc2,28) + R(d,e,f,g,h,a,b,c,0xd5a79147930aa725,29) + R(c,d,e,f,g,h,a,b,0x06ca6351e003826f,30) + R(b,c,d,e,f,g,h,a,0x142929670a0e6e70,31) + + + R(a,b,c,d,e,f,g,h,0x27b70a8546d22ffc,32) + R(h,a,b,c,d,e,f,g,0x2e1b21385c26c926,33) + R(g,h,a,b,c,d,e,f,0x4d2c6dfc5ac42aed,34) + R(f,g,h,a,b,c,d,e,0x53380d139d95b3df,35) + R(e,f,g,h,a,b,c,d,0x650a73548baf63de,36) + R(d,e,f,g,h,a,b,c,0x766a0abb3c77b2a8,37) + R(c,d,e,f,g,h,a,b,0x81c2c92e47edaee6,38) + R(b,c,d,e,f,g,h,a,0x92722c851482353b,39) + + R(a,b,c,d,e,f,g,h,0xa2bfe8a14cf10364,40) + R(h,a,b,c,d,e,f,g,0xa81a664bbc423001,41) + R(g,h,a,b,c,d,e,f,0xc24b8b70d0f89791,42) + R(f,g,h,a,b,c,d,e,0xc76c51a30654be30,43) + R(e,f,g,h,a,b,c,d,0xd192e819d6ef5218,44) + R(d,e,f,g,h,a,b,c,0xd69906245565a910,45) + R(c,d,e,f,g,h,a,b,0xf40e35855771202a,46) + R(b,c,d,e,f,g,h,a,0x106aa07032bbd1b8,47) + + R(a,b,c,d,e,f,g,h,0x19a4c116b8d2d0c8,48) + R(h,a,b,c,d,e,f,g,0x1e376c085141ab53,49) + R(g,h,a,b,c,d,e,f,0x2748774cdf8eeb99,50) + R(f,g,h,a,b,c,d,e,0x34b0bcb5e19b48a8,51) + R(e,f,g,h,a,b,c,d,0x391c0cb3c5c95a63,52) + R(d,e,f,g,h,a,b,c,0x4ed8aa4ae3418acb,53) + R(c,d,e,f,g,h,a,b,0x5b9cca4f7763e373,54) + R(b,c,d,e,f,g,h,a,0x682e6ff3d6b2b8a3,55) + + R(a,b,c,d,e,f,g,h,0x748f82ee5defb2fc,56) + R(h,a,b,c,d,e,f,g,0x78a5636f43172f60,57) + R(g,h,a,b,c,d,e,f,0x84c87814a1f0ab72,58) + R(f,g,h,a,b,c,d,e,0x8cc702081a6439ec,59) + R(e,f,g,h,a,b,c,d,0x90befffa23631e28,60) + R(d,e,f,g,h,a,b,c,0xa4506cebde82bde9,61) + R(c,d,e,f,g,h,a,b,0xbef9a3f7b2c67915,62) + R(b,c,d,e,f,g,h,a,0xc67178f2e372532b,63) + + R(a,b,c,d,e,f,g,h,0xca273eceea26619c,64) + R(h,a,b,c,d,e,f,g,0xd186b8c721c0c207,65) + R(g,h,a,b,c,d,e,f,0xeada7dd6cde0eb1e,66) + R(f,g,h,a,b,c,d,e,0xf57d4f7fee6ed178,67) + R(e,f,g,h,a,b,c,d,0x06f067aa72176fba,68) + R(d,e,f,g,h,a,b,c,0x0a637dc5a2c898a6,69) + R(c,d,e,f,g,h,a,b,0x113f9804bef90dae,70) + R(b,c,d,e,f,g,h,a,0x1b710b35131c471b,71) + + R(a,b,c,d,e,f,g,h,0x28db77f523047d84,72) + R(h,a,b,c,d,e,f,g,0x32caab7b40c72493,73) + R(g,h,a,b,c,d,e,f,0x3c9ebe0a15c9bebc,74) + R(f,g,h,a,b,c,d,e,0x431d67c49c100d4c,75) + R(e,f,g,h,a,b,c,d,0x4cc5d4becb3e42b6,76) + R(d,e,f,g,h,a,b,c,0x597f299cfc657e2a,77) + R(c,d,e,f,g,h,a,b,0x5fcb6fab3ad6faec,78) + R(b,c,d,e,f,g,h,a,0x6c44198c4a475817,79) + + *h02 += a; + *h12 += b; + *h22 += c; + *h32 += d; + *h42 += e; + *h52 += f; + *h62 += g; + *h72 += h; +}