mirror of
https://github.com/ultimatepp/ultimatepp.git
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255 lines
6 KiB
C++
255 lines
6 KiB
C++
#include "Core.h"
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namespace Upp {
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/*
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* SHA256
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*
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* The author (Brad Conte) has released this file "into the public domain free
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* of any restrictions". This file is unchanged except for some style
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* clean-up.
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*/
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// DBL_INT_ADD treats two unsigned ints a and b as one 64-bit integer and adds
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// c to it
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#define DBL_INT_ADD(a,b,c) if (a > 0xffffffff - (c)) ++b; a += c;
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#define ROTLEFT(a,b) (((a) << (b)) | ((a) >> (32-(b))))
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#define ROTRIGHT(a,b) (((a) >> (b)) | ((a) << (32-(b))))
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#define CH(x,y,z) (((x) & (y)) ^ (~(x) & (z)))
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#define MAJ(x,y,z) (((x) & (y)) ^ ((x) & (z)) ^ ((y) & (z)))
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#define EP0(x) (ROTRIGHT(x,2) ^ ROTRIGHT(x,13) ^ ROTRIGHT(x,22))
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#define EP1(x) (ROTRIGHT(x,6) ^ ROTRIGHT(x,11) ^ ROTRIGHT(x,25))
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#define SIG0(x) (ROTRIGHT(x,7) ^ ROTRIGHT(x,18) ^ ((x) >> 3))
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#define SIG1(x) (ROTRIGHT(x,17) ^ ROTRIGHT(x,19) ^ ((x) >> 10))
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struct SHA256_CTX
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{
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byte data[64];
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dword datalen;
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dword bitlen[2];
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dword state[8];
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};
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dword k[64] =
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{
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0x428a2f98, 0x71374491, 0xb5c0fbcf, 0xe9b5dba5, 0x3956c25b, 0x59f111f1,
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0x923f82a4, 0xab1c5ed5, 0xd807aa98, 0x12835b01, 0x243185be, 0x550c7dc3,
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0x72be5d74, 0x80deb1fe, 0x9bdc06a7, 0xc19bf174, 0xe49b69c1, 0xefbe4786,
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0x0fc19dc6, 0x240ca1cc, 0x2de92c6f, 0x4a7484aa, 0x5cb0a9dc, 0x76f988da,
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0x983e5152, 0xa831c66d, 0xb00327c8, 0xbf597fc7, 0xc6e00bf3, 0xd5a79147,
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0x06ca6351, 0x14292967, 0x27b70a85, 0x2e1b2138, 0x4d2c6dfc, 0x53380d13,
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0x650a7354, 0x766a0abb, 0x81c2c92e, 0x92722c85, 0xa2bfe8a1, 0xa81a664b,
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0xc24b8b70, 0xc76c51a3, 0xd192e819, 0xd6990624, 0xf40e3585, 0x106aa070,
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0x19a4c116, 0x1e376c08, 0x2748774c, 0x34b0bcb5, 0x391c0cb3, 0x4ed8aa4a,
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0x5b9cca4f, 0x682e6ff3, 0x748f82ee, 0x78a5636f, 0x84c87814, 0x8cc70208,
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0x90befffa, 0xa4506ceb, 0xbef9a3f7, 0xc67178f2
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};
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static void sha256_transform(SHA256_CTX *ctx, const byte *data)
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{
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dword a, b, c, d, e, f, g, h, i, j, t1, t2, m[64];
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for (i = 0, j = 0; i < 16; ++i, j += 4)
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m[i] = (data[j] << 24) | (data[j+1] << 16) | (data[j+2] << 8) | (data[j+3]);
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for (; i < 64; ++i)
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m[i] = SIG1(m[i-2]) + m[i-7] + SIG0(m[i-15]) + m[i-16];
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a = ctx->state[0];
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b = ctx->state[1];
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c = ctx->state[2];
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d = ctx->state[3];
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e = ctx->state[4];
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f = ctx->state[5];
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g = ctx->state[6];
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h = ctx->state[7];
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for (i = 0; i < 64; ++i)
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{
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t1 = h + EP1(e) + CH(e,f,g) + k[i] + m[i];
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t2 = EP0(a) + MAJ(a,b,c);
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h = g;
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g = f;
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f = e;
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e = d + t1;
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d = c;
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c = b;
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b = a;
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a = t1 + t2;
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}
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ctx->state[0] += a;
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ctx->state[1] += b;
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ctx->state[2] += c;
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ctx->state[3] += d;
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ctx->state[4] += e;
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ctx->state[5] += f;
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ctx->state[6] += g;
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ctx->state[7] += h;
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}
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static void sha256_init(SHA256_CTX *ctx)
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{
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ctx->datalen = 0;
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ctx->bitlen[0] = 0;
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ctx->bitlen[1] = 0;
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ctx->state[0] = 0x6a09e667;
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ctx->state[1] = 0xbb67ae85;
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ctx->state[2] = 0x3c6ef372;
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ctx->state[3] = 0xa54ff53a;
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ctx->state[4] = 0x510e527f;
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ctx->state[5] = 0x9b05688c;
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ctx->state[6] = 0x1f83d9ab;
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ctx->state[7] = 0x5be0cd19;
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}
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static void sha256_update(SHA256_CTX *ctx, const byte *data, dword len)
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{
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dword i;
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for (i=0; i < len; ++i)
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{
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ctx->data[ctx->datalen] = data[i];
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ctx->datalen++;
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if (ctx->datalen == 64)
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{
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sha256_transform(ctx,ctx->data);
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DBL_INT_ADD(ctx->bitlen[0],ctx->bitlen[1],512);
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ctx->datalen = 0;
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}
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}
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}
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static void sha256_final(SHA256_CTX *ctx, byte *hash)
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{
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dword i;
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i = ctx->datalen;
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// Pad whatever data is left in the buffer.
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if (ctx->datalen < 56)
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{
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ctx->data[i++] = 0x80;
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while (i < 56)
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ctx->data[i++] = 0x00;
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}
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else
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{
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ctx->data[i++] = 0x80;
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while (i < 64)
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ctx->data[i++] = 0x00;
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sha256_transform(ctx,ctx->data);
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memset(ctx->data,0,56);
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}
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// Append to the padding the total message's length in bits and transform.
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DBL_INT_ADD(ctx->bitlen[0],ctx->bitlen[1],ctx->datalen * 8);
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ctx->data[63] = byte(ctx->bitlen[0]);
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ctx->data[62] = byte(ctx->bitlen[0] >> 8);
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ctx->data[61] = byte(ctx->bitlen[0] >> 16);
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ctx->data[60] = byte(ctx->bitlen[0] >> 24);
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ctx->data[59] = byte(ctx->bitlen[1]);
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ctx->data[58] = byte(ctx->bitlen[1] >> 8);
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ctx->data[57] = byte(ctx->bitlen[1] >> 16);
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ctx->data[56] = byte(ctx->bitlen[1] >> 24);
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sha256_transform(ctx,ctx->data);
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// Since this implementation uses little endian byte ordering and SHA uses
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// big endian, reverse all the bytes when copying the final state to the
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// output hash.
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for (i=0; i < 4; ++i)
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{
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hash[i] = (ctx->state[0] >> (24-i*8)) & 0x000000ff;
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hash[i+4] = (ctx->state[1] >> (24-i*8)) & 0x000000ff;
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hash[i+8] = (ctx->state[2] >> (24-i*8)) & 0x000000ff;
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hash[i+12] = (ctx->state[3] >> (24-i*8)) & 0x000000ff;
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hash[i+16] = (ctx->state[4] >> (24-i*8)) & 0x000000ff;
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hash[i+20] = (ctx->state[5] >> (24-i*8)) & 0x000000ff;
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hash[i+24] = (ctx->state[6] >> (24-i*8)) & 0x000000ff;
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hash[i+28] = (ctx->state[7] >> (24-i*8)) & 0x000000ff;
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}
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}
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void Sha256Stream::Cleanup()
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{
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STATIC_ASSERT(sizeof(SHA256_CTX) < 128);
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memset(buffer, 0, sizeof(buffer));
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}
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void Sha256Stream::Out(const void *data, dword length)
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{
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sha256_update((SHA256_CTX *)buffer, (const byte *)data, length);
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}
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void Sha256Stream::Finish(byte *hash32)
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{
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Flush();
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sha256_final((SHA256_CTX *)buffer, hash32);
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Cleanup();
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}
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String Sha256Stream::FinishString()
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{
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byte hash[32];
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Finish(hash);
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return HexString(hash, 32);
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}
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String Sha256Stream::FinishStringS()
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{
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byte hash[32];
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Finish(hash);
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return HexString(hash, 32, 4);
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}
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void Sha256Stream::Reset() {
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sha256_init((SHA256_CTX *)buffer);
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}
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Sha256Stream::Sha256Stream()
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{
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Reset();
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}
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Sha256Stream::~Sha256Stream()
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{
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Cleanup();
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}
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void SHA256(byte *hash20, const void *data, dword size)
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{
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Sha256Stream sha1;
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sha1.Put(data, size);
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sha1.Finish(hash20);
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}
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void SHA256(byte *hash20, const String& s)
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{
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return SHA256(hash20, s, s.GetLength());
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}
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String SHA256String(const void *data, dword size)
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{
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Sha256Stream sha1;
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sha1.Put(data, size);
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return sha1.FinishString();
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}
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String SHA256String(const String& data)
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{
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return SHA256String(~data, data.GetLength());
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}
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String SHA256StringS(const void *data, dword size)
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{
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Sha256Stream sha1;
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sha1.Put(data, size);
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return sha1.FinishStringS();
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}
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String SHA256StringS(const String& data)
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{
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return SHA256StringS(~data, data.GetLength());
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}
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}
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