275 lines
9.4 KiB
C
275 lines
9.4 KiB
C
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/*
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* Copyright (c) 2015, Cameron Rich
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*
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* * Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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* * Neither the name of the axTLS project nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <string.h>
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#include "os_port.h"
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#include "crypto.h"
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#define GET_UINT32(n,b,i) \
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{ \
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(n) = ((uint32_t) (b)[(i) ] << 24) \
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| ((uint32_t) (b)[(i) + 1] << 16) \
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| ((uint32_t) (b)[(i) + 2] << 8) \
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| ((uint32_t) (b)[(i) + 3] ); \
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}
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#define PUT_UINT32(n,b,i) \
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{ \
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(b)[(i) ] = (uint8_t) ((n) >> 24); \
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(b)[(i) + 1] = (uint8_t) ((n) >> 16); \
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(b)[(i) + 2] = (uint8_t) ((n) >> 8); \
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(b)[(i) + 3] = (uint8_t) ((n) ); \
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}
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static const uint8_t sha256_padding[64] =
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{
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0x80, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
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};
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/**
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* Initialize the SHA256 context
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*/
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void SHA256_Init(SHA256_CTX *ctx)
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{
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ctx->total[0] = 0;
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ctx->total[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_Process(const uint8_t digest[64], SHA256_CTX *ctx)
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{
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uint32_t temp1, temp2, W[64];
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uint32_t A, B, C, D, E, F, G, H;
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GET_UINT32(W[0], digest, 0);
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GET_UINT32(W[1], digest, 4);
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GET_UINT32(W[2], digest, 8);
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GET_UINT32(W[3], digest, 12);
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GET_UINT32(W[4], digest, 16);
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GET_UINT32(W[5], digest, 20);
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GET_UINT32(W[6], digest, 24);
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GET_UINT32(W[7], digest, 28);
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GET_UINT32(W[8], digest, 32);
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GET_UINT32(W[9], digest, 36);
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GET_UINT32(W[10], digest, 40);
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GET_UINT32(W[11], digest, 44);
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GET_UINT32(W[12], digest, 48);
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GET_UINT32(W[13], digest, 52);
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GET_UINT32(W[14], digest, 56);
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GET_UINT32(W[15], digest, 60);
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#define SHR(x,n) ((x & 0xFFFFFFFF) >> n)
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#define ROTR(x,n) (SHR(x,n) | (x << (32 - n)))
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#define S0(x) (ROTR(x, 7) ^ ROTR(x,18) ^ SHR(x, 3))
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#define S1(x) (ROTR(x,17) ^ ROTR(x,19) ^ SHR(x,10))
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#define S2(x) (ROTR(x, 2) ^ ROTR(x,13) ^ ROTR(x,22))
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#define S3(x) (ROTR(x, 6) ^ ROTR(x,11) ^ ROTR(x,25))
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#define F0(x,y,z) ((x & y) | (z & (x | y)))
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#define F1(x,y,z) (z ^ (x & (y ^ z)))
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#define R(t) \
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( \
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W[t] = S1(W[t - 2]) + W[t - 7] + \
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S0(W[t - 15]) + W[t - 16] \
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)
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#define P(a,b,c,d,e,f,g,h,x,K) \
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{ \
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temp1 = h + S3(e) + F1(e,f,g) + K + x; \
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temp2 = S2(a) + F0(a,b,c); \
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d += temp1; h = temp1 + temp2; \
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}
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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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P(A, B, C, D, E, F, G, H, W[ 0], 0x428A2F98);
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P(H, A, B, C, D, E, F, G, W[ 1], 0x71374491);
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P(G, H, A, B, C, D, E, F, W[ 2], 0xB5C0FBCF);
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P(F, G, H, A, B, C, D, E, W[ 3], 0xE9B5DBA5);
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P(E, F, G, H, A, B, C, D, W[ 4], 0x3956C25B);
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P(D, E, F, G, H, A, B, C, W[ 5], 0x59F111F1);
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P(C, D, E, F, G, H, A, B, W[ 6], 0x923F82A4);
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P(B, C, D, E, F, G, H, A, W[ 7], 0xAB1C5ED5);
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P(A, B, C, D, E, F, G, H, W[ 8], 0xD807AA98);
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P(H, A, B, C, D, E, F, G, W[ 9], 0x12835B01);
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P(G, H, A, B, C, D, E, F, W[10], 0x243185BE);
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P(F, G, H, A, B, C, D, E, W[11], 0x550C7DC3);
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P(E, F, G, H, A, B, C, D, W[12], 0x72BE5D74);
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P(D, E, F, G, H, A, B, C, W[13], 0x80DEB1FE);
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P(C, D, E, F, G, H, A, B, W[14], 0x9BDC06A7);
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P(B, C, D, E, F, G, H, A, W[15], 0xC19BF174);
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P(A, B, C, D, E, F, G, H, R(16), 0xE49B69C1);
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P(H, A, B, C, D, E, F, G, R(17), 0xEFBE4786);
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P(G, H, A, B, C, D, E, F, R(18), 0x0FC19DC6);
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P(F, G, H, A, B, C, D, E, R(19), 0x240CA1CC);
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P(E, F, G, H, A, B, C, D, R(20), 0x2DE92C6F);
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P(D, E, F, G, H, A, B, C, R(21), 0x4A7484AA);
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P(C, D, E, F, G, H, A, B, R(22), 0x5CB0A9DC);
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P(B, C, D, E, F, G, H, A, R(23), 0x76F988DA);
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P(A, B, C, D, E, F, G, H, R(24), 0x983E5152);
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P(H, A, B, C, D, E, F, G, R(25), 0xA831C66D);
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P(G, H, A, B, C, D, E, F, R(26), 0xB00327C8);
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P(F, G, H, A, B, C, D, E, R(27), 0xBF597FC7);
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P(E, F, G, H, A, B, C, D, R(28), 0xC6E00BF3);
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P(D, E, F, G, H, A, B, C, R(29), 0xD5A79147);
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P(C, D, E, F, G, H, A, B, R(30), 0x06CA6351);
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P(B, C, D, E, F, G, H, A, R(31), 0x14292967);
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P(A, B, C, D, E, F, G, H, R(32), 0x27B70A85);
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P(H, A, B, C, D, E, F, G, R(33), 0x2E1B2138);
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P(G, H, A, B, C, D, E, F, R(34), 0x4D2C6DFC);
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P(F, G, H, A, B, C, D, E, R(35), 0x53380D13);
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P(E, F, G, H, A, B, C, D, R(36), 0x650A7354);
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P(D, E, F, G, H, A, B, C, R(37), 0x766A0ABB);
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P(C, D, E, F, G, H, A, B, R(38), 0x81C2C92E);
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P(B, C, D, E, F, G, H, A, R(39), 0x92722C85);
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P(A, B, C, D, E, F, G, H, R(40), 0xA2BFE8A1);
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P(H, A, B, C, D, E, F, G, R(41), 0xA81A664B);
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P(G, H, A, B, C, D, E, F, R(42), 0xC24B8B70);
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P(F, G, H, A, B, C, D, E, R(43), 0xC76C51A3);
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P(E, F, G, H, A, B, C, D, R(44), 0xD192E819);
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P(D, E, F, G, H, A, B, C, R(45), 0xD6990624);
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P(C, D, E, F, G, H, A, B, R(46), 0xF40E3585);
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P(B, C, D, E, F, G, H, A, R(47), 0x106AA070);
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P(A, B, C, D, E, F, G, H, R(48), 0x19A4C116);
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P(H, A, B, C, D, E, F, G, R(49), 0x1E376C08);
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P(G, H, A, B, C, D, E, F, R(50), 0x2748774C);
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P(F, G, H, A, B, C, D, E, R(51), 0x34B0BCB5);
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P(E, F, G, H, A, B, C, D, R(52), 0x391C0CB3);
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P(D, E, F, G, H, A, B, C, R(53), 0x4ED8AA4A);
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P(C, D, E, F, G, H, A, B, R(54), 0x5B9CCA4F);
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P(B, C, D, E, F, G, H, A, R(55), 0x682E6FF3);
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P(A, B, C, D, E, F, G, H, R(56), 0x748F82EE);
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P(H, A, B, C, D, E, F, G, R(57), 0x78A5636F);
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P(G, H, A, B, C, D, E, F, R(58), 0x84C87814);
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P(F, G, H, A, B, C, D, E, R(59), 0x8CC70208);
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P(E, F, G, H, A, B, C, D, R(60), 0x90BEFFFA);
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P(D, E, F, G, H, A, B, C, R(61), 0xA4506CEB);
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P(C, D, E, F, G, H, A, B, R(62), 0xBEF9A3F7);
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P(B, C, D, E, F, G, H, A, R(63), 0xC67178F2);
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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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/**
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* Accepts an array of octets as the next portion of the message.
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*/
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void SHA256_Update(SHA256_CTX *ctx, const uint8_t * msg, int len)
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{
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uint32_t left = ctx->total[0] & 0x3F;
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uint32_t fill = 64 - left;
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ctx->total[0] += len;
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ctx->total[0] &= 0xFFFFFFFF;
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if (ctx->total[0] < len)
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ctx->total[1]++;
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if (left && len >= fill)
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{
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memcpy((void *) (ctx->buffer + left), (void *)msg, fill);
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SHA256_Process(ctx->buffer, ctx);
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len -= fill;
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msg += fill;
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left = 0;
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}
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while (len >= 64)
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{
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SHA256_Process(msg, ctx);
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len -= 64;
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msg += 64;
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}
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if (len)
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{
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memcpy((void *) (ctx->buffer + left), (void *) msg, len);
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}
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}
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/**
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* Return the 256-bit message digest into the user's array
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*/
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void SHA256_Final(uint8_t *digest, SHA256_CTX *ctx)
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{
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uint32_t last, padn;
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uint32_t high, low;
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uint8_t msglen[8];
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high = (ctx->total[0] >> 29)
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| (ctx->total[1] << 3);
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low = (ctx->total[0] << 3);
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PUT_UINT32(high, msglen, 0);
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PUT_UINT32(low, msglen, 4);
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last = ctx->total[0] & 0x3F;
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padn = (last < 56) ? (56 - last) : (120 - last);
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SHA256_Update(ctx, sha256_padding, padn);
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SHA256_Update(ctx, msglen, 8);
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PUT_UINT32(ctx->state[0], digest, 0);
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PUT_UINT32(ctx->state[1], digest, 4);
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PUT_UINT32(ctx->state[2], digest, 8);
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PUT_UINT32(ctx->state[3], digest, 12);
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PUT_UINT32(ctx->state[4], digest, 16);
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PUT_UINT32(ctx->state[5], digest, 20);
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PUT_UINT32(ctx->state[6], digest, 24);
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PUT_UINT32(ctx->state[7], digest, 28);
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}
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