diff options
Diffstat (limited to 'src/hash/sha2/sha256.cpp')
| -rw-r--r-- | src/hash/sha2/sha256.cpp | 124 |
1 files changed, 124 insertions, 0 deletions
diff --git a/src/hash/sha2/sha256.cpp b/src/hash/sha2/sha256.cpp new file mode 100644 index 000000000..6031d177f --- /dev/null +++ b/src/hash/sha2/sha256.cpp @@ -0,0 +1,124 @@ +/************************************************* +* SHA-256 Source File * +* (C) 1999-2007 Jack Lloyd * +*************************************************/ + +#include <botan/sha256.h> +#include <botan/loadstor.h> +#include <botan/bit_ops.h> + +namespace Botan { + +namespace { + +/************************************************* +* SHA-256 Rho Function * +*************************************************/ +inline u32bit rho(u32bit X, u32bit rot1, u32bit rot2, u32bit rot3) + { + return (rotate_right(X, rot1) ^ rotate_right(X, rot2) ^ + rotate_right(X, rot3)); + } + +/************************************************* +* SHA-256 Sigma Function * +*************************************************/ +inline u32bit sigma(u32bit X, u32bit rot1, u32bit rot2, u32bit shift) + { + return (rotate_right(X, rot1) ^ rotate_right(X, rot2) ^ (X >> shift)); + } + +/************************************************* +* SHA-256 F1 Function * +*************************************************/ +inline void F1(u32bit A, u32bit B, u32bit C, u32bit& D, + u32bit E, u32bit F, u32bit G, u32bit& H, + u32bit msg, u32bit magic) + { + magic += rho(E, 6, 11, 25) + ((E & F) ^ (~E & G)) + msg; + D += magic + H; + H += magic + rho(A, 2, 13, 22) + ((A & B) ^ (A & C) ^ (B & C)); + } + +} + +/************************************************* +* SHA-256 Compression Function * +*************************************************/ +void SHA_256::hash(const byte input[]) + { + for(u32bit j = 0; j != 16; ++j) + W[j] = load_be<u32bit>(input, j); + for(u32bit j = 16; j != 64; ++j) + W[j] = sigma(W[j- 2], 17, 19, 10) + W[j- 7] + + sigma(W[j-15], 7, 18, 3) + W[j-16]; + + u32bit A = digest[0], B = digest[1], C = digest[2], + D = digest[3], E = digest[4], F = digest[5], + G = digest[6], H = digest[7]; + + F1(A,B,C,D,E,F,G,H,W[ 0],0x428A2F98); F1(H,A,B,C,D,E,F,G,W[ 1],0x71374491); + F1(G,H,A,B,C,D,E,F,W[ 2],0xB5C0FBCF); F1(F,G,H,A,B,C,D,E,W[ 3],0xE9B5DBA5); + F1(E,F,G,H,A,B,C,D,W[ 4],0x3956C25B); F1(D,E,F,G,H,A,B,C,W[ 5],0x59F111F1); + F1(C,D,E,F,G,H,A,B,W[ 6],0x923F82A4); F1(B,C,D,E,F,G,H,A,W[ 7],0xAB1C5ED5); + F1(A,B,C,D,E,F,G,H,W[ 8],0xD807AA98); F1(H,A,B,C,D,E,F,G,W[ 9],0x12835B01); + F1(G,H,A,B,C,D,E,F,W[10],0x243185BE); F1(F,G,H,A,B,C,D,E,W[11],0x550C7DC3); + F1(E,F,G,H,A,B,C,D,W[12],0x72BE5D74); F1(D,E,F,G,H,A,B,C,W[13],0x80DEB1FE); + F1(C,D,E,F,G,H,A,B,W[14],0x9BDC06A7); F1(B,C,D,E,F,G,H,A,W[15],0xC19BF174); + F1(A,B,C,D,E,F,G,H,W[16],0xE49B69C1); F1(H,A,B,C,D,E,F,G,W[17],0xEFBE4786); + F1(G,H,A,B,C,D,E,F,W[18],0x0FC19DC6); F1(F,G,H,A,B,C,D,E,W[19],0x240CA1CC); + F1(E,F,G,H,A,B,C,D,W[20],0x2DE92C6F); F1(D,E,F,G,H,A,B,C,W[21],0x4A7484AA); + F1(C,D,E,F,G,H,A,B,W[22],0x5CB0A9DC); F1(B,C,D,E,F,G,H,A,W[23],0x76F988DA); + F1(A,B,C,D,E,F,G,H,W[24],0x983E5152); F1(H,A,B,C,D,E,F,G,W[25],0xA831C66D); + F1(G,H,A,B,C,D,E,F,W[26],0xB00327C8); F1(F,G,H,A,B,C,D,E,W[27],0xBF597FC7); + F1(E,F,G,H,A,B,C,D,W[28],0xC6E00BF3); F1(D,E,F,G,H,A,B,C,W[29],0xD5A79147); + F1(C,D,E,F,G,H,A,B,W[30],0x06CA6351); F1(B,C,D,E,F,G,H,A,W[31],0x14292967); + F1(A,B,C,D,E,F,G,H,W[32],0x27B70A85); F1(H,A,B,C,D,E,F,G,W[33],0x2E1B2138); + F1(G,H,A,B,C,D,E,F,W[34],0x4D2C6DFC); F1(F,G,H,A,B,C,D,E,W[35],0x53380D13); + F1(E,F,G,H,A,B,C,D,W[36],0x650A7354); F1(D,E,F,G,H,A,B,C,W[37],0x766A0ABB); + F1(C,D,E,F,G,H,A,B,W[38],0x81C2C92E); F1(B,C,D,E,F,G,H,A,W[39],0x92722C85); + F1(A,B,C,D,E,F,G,H,W[40],0xA2BFE8A1); F1(H,A,B,C,D,E,F,G,W[41],0xA81A664B); + F1(G,H,A,B,C,D,E,F,W[42],0xC24B8B70); F1(F,G,H,A,B,C,D,E,W[43],0xC76C51A3); + F1(E,F,G,H,A,B,C,D,W[44],0xD192E819); F1(D,E,F,G,H,A,B,C,W[45],0xD6990624); + F1(C,D,E,F,G,H,A,B,W[46],0xF40E3585); F1(B,C,D,E,F,G,H,A,W[47],0x106AA070); + F1(A,B,C,D,E,F,G,H,W[48],0x19A4C116); F1(H,A,B,C,D,E,F,G,W[49],0x1E376C08); + F1(G,H,A,B,C,D,E,F,W[50],0x2748774C); F1(F,G,H,A,B,C,D,E,W[51],0x34B0BCB5); + F1(E,F,G,H,A,B,C,D,W[52],0x391C0CB3); F1(D,E,F,G,H,A,B,C,W[53],0x4ED8AA4A); + F1(C,D,E,F,G,H,A,B,W[54],0x5B9CCA4F); F1(B,C,D,E,F,G,H,A,W[55],0x682E6FF3); + F1(A,B,C,D,E,F,G,H,W[56],0x748F82EE); F1(H,A,B,C,D,E,F,G,W[57],0x78A5636F); + F1(G,H,A,B,C,D,E,F,W[58],0x84C87814); F1(F,G,H,A,B,C,D,E,W[59],0x8CC70208); + F1(E,F,G,H,A,B,C,D,W[60],0x90BEFFFA); F1(D,E,F,G,H,A,B,C,W[61],0xA4506CEB); + F1(C,D,E,F,G,H,A,B,W[62],0xBEF9A3F7); F1(B,C,D,E,F,G,H,A,W[63],0xC67178F2); + + digest[0] += A; digest[1] += B; digest[2] += C; + digest[3] += D; digest[4] += E; digest[5] += F; + digest[6] += G; digest[7] += H; + } + +/************************************************* +* Copy out the digest * +*************************************************/ +void SHA_256::copy_out(byte output[]) + { + for(u32bit j = 0; j != OUTPUT_LENGTH; j += 4) + store_be(digest[j/4], output + j); + } + +/************************************************* +* Clear memory of sensitive data * +*************************************************/ +void SHA_256::clear() throw() + { + MDx_HashFunction::clear(); + W.clear(); + digest[0] = 0x6A09E667; + digest[1] = 0xBB67AE85; + digest[2] = 0x3C6EF372; + digest[3] = 0xA54FF53A; + digest[4] = 0x510E527F; + digest[5] = 0x9B05688C; + digest[6] = 0x1F83D9AB; + digest[7] = 0x5BE0CD19; + } + +} |