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ec7381fbf6
In preparation for making the hash function common, we may as well use const where we can. Also add a watchdog version of the hashing function. Signed-off-by: Simon Glass <sjg@chromium.org>
296 lines
8.7 KiB
C
296 lines
8.7 KiB
C
/*
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* FIPS-180-2 compliant SHA-256 implementation
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*
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* Copyright (C) 2001-2003 Christophe Devine
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#ifndef USE_HOSTCC
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#include <common.h>
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#endif /* USE_HOSTCC */
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#include <watchdog.h>
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#include <linux/string.h>
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#include <sha256.h>
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/*
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* 32-bit integer manipulation macros (big endian)
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*/
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#ifndef GET_UINT32_BE
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#define GET_UINT32_BE(n,b,i) { \
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(n) = ( (unsigned long) (b)[(i) ] << 24 ) \
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| ( (unsigned long) (b)[(i) + 1] << 16 ) \
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| ( (unsigned long) (b)[(i) + 2] << 8 ) \
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| ( (unsigned long) (b)[(i) + 3] ); \
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}
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#endif
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#ifndef PUT_UINT32_BE
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#define PUT_UINT32_BE(n,b,i) { \
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(b)[(i) ] = (unsigned char) ( (n) >> 24 ); \
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(b)[(i) + 1] = (unsigned char) ( (n) >> 16 ); \
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(b)[(i) + 2] = (unsigned char) ( (n) >> 8 ); \
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(b)[(i) + 3] = (unsigned char) ( (n) ); \
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}
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#endif
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void sha256_starts(sha256_context * 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(sha256_context *ctx, const uint8_t data[64])
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{
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uint32_t temp1, temp2;
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uint32_t W[64];
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uint32_t A, B, C, D, E, F, G, H;
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GET_UINT32_BE(W[0], data, 0);
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GET_UINT32_BE(W[1], data, 4);
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GET_UINT32_BE(W[2], data, 8);
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GET_UINT32_BE(W[3], data, 12);
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GET_UINT32_BE(W[4], data, 16);
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GET_UINT32_BE(W[5], data, 20);
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GET_UINT32_BE(W[6], data, 24);
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GET_UINT32_BE(W[7], data, 28);
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GET_UINT32_BE(W[8], data, 32);
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GET_UINT32_BE(W[9], data, 36);
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GET_UINT32_BE(W[10], data, 40);
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GET_UINT32_BE(W[11], data, 44);
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GET_UINT32_BE(W[12], data, 48);
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GET_UINT32_BE(W[13], data, 52);
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GET_UINT32_BE(W[14], data, 56);
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GET_UINT32_BE(W[15], data, 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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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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void sha256_update(sha256_context *ctx, const uint8_t *input, uint32_t length)
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{
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uint32_t left, fill;
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if (!length)
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return;
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left = ctx->total[0] & 0x3F;
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fill = 64 - left;
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ctx->total[0] += length;
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ctx->total[0] &= 0xFFFFFFFF;
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if (ctx->total[0] < length)
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ctx->total[1]++;
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if (left && length >= fill) {
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memcpy((void *) (ctx->buffer + left), (void *) input, fill);
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sha256_process(ctx, ctx->buffer);
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length -= fill;
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input += fill;
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left = 0;
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}
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while (length >= 64) {
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sha256_process(ctx, input);
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length -= 64;
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input += 64;
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}
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if (length)
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memcpy((void *) (ctx->buffer + left), (void *) input, length);
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}
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static uint8_t sha256_padding[64] = {
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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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void sha256_finish(sha256_context * ctx, uint8_t digest[32])
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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_BE(high, msglen, 0);
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PUT_UINT32_BE(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_BE(ctx->state[0], digest, 0);
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PUT_UINT32_BE(ctx->state[1], digest, 4);
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PUT_UINT32_BE(ctx->state[2], digest, 8);
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PUT_UINT32_BE(ctx->state[3], digest, 12);
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PUT_UINT32_BE(ctx->state[4], digest, 16);
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PUT_UINT32_BE(ctx->state[5], digest, 20);
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PUT_UINT32_BE(ctx->state[6], digest, 24);
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PUT_UINT32_BE(ctx->state[7], digest, 28);
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}
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/*
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* Output = SHA-256( input buffer ). Trigger the watchdog every 'chunk_sz'
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* bytes of input processed.
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*/
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void sha256_csum_wd(const unsigned char *input, unsigned int ilen,
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unsigned char *output, unsigned int chunk_sz)
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{
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sha256_context ctx;
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#if defined(CONFIG_HW_WATCHDOG) || defined(CONFIG_WATCHDOG)
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unsigned char *end, *curr;
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int chunk;
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#endif
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sha256_starts(&ctx);
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#if defined(CONFIG_HW_WATCHDOG) || defined(CONFIG_WATCHDOG)
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curr = input;
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end = input + ilen;
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while (curr < end) {
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chunk = end - curr;
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if (chunk > chunk_sz)
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chunk = chunk_sz;
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sha256_update(&ctx, curr, chunk);
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curr += chunk;
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WATCHDOG_RESET();
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}
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#else
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sha256_update(&ctx, input, ilen);
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#endif
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sha256_finish(&ctx, output);
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}
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