286 lines
9.9 KiB
C
286 lines
9.9 KiB
C
/* $Id$
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*****************************************************************************
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*
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* File: sha256.c
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*
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* Purpose: Implementation of the SHA256 message-digest algorithm for
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* libfwknop.
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*
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*
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* Copyright (C) 2001 Rafael R. Sevilla <sevillar@team.ph.inter.net>
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library 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 GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the Free
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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*****************************************************************************
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*/
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#include "sha.h"
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/* Truncate to 32 bits -- should be a null op on 32-bit machines
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*/
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#define TRUNC32(x) ((x) & 0xffffffffL)
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/* 32-bit rotate to the RIGHT
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*/
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#define ROT32(x,n) TRUNC32(((x >> n) | (x << (32 - n))))
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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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/* Upper-case sigma functions in SHA spec
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*/
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#define USIG0(x) (ROT32(x, 2)^ROT32(x, 13)^ROT32(x, 22))
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#define USIG1(x) (ROT32(x, 6)^ROT32(x, 11)^ROT32(x, 25))
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/* Lower-case sigma functions in SHA spec
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*/
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#define LSIG0(x) (ROT32(x, 7)^ROT32(x, 18)^TRUNC32(x >> 3))
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#define LSIG1(x) (ROT32(x, 17)^ROT32(x, 19)^TRUNC32(x >> 10))
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/* SHA256 constants
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*/
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static uint32 K[64] = {
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0x428a2f98L, 0x71374491L, 0xb5c0fbcfL, 0xe9b5dba5L,
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0x3956c25bL, 0x59f111f1L, 0x923f82a4L, 0xab1c5ed5L,
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0xd807aa98L, 0x12835b01L, 0x243185beL, 0x550c7dc3L,
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0x72be5d74L, 0x80deb1feL, 0x9bdc06a7L, 0xc19bf174L,
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0xe49b69c1L, 0xefbe4786L, 0x0fc19dc6L, 0x240ca1ccL,
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0x2de92c6fL, 0x4a7484aaL, 0x5cb0a9dcL, 0x76f988daL,
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0x983e5152L, 0xa831c66dL, 0xb00327c8L, 0xbf597fc7L,
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0xc6e00bf3L, 0xd5a79147L, 0x06ca6351L, 0x14292967L,
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0x27b70a85L, 0x2e1b2138L, 0x4d2c6dfcL, 0x53380d13L,
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0x650a7354L, 0x766a0abbL, 0x81c2c92eL, 0x92722c85L,
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0xa2bfe8a1L, 0xa81a664bL, 0xc24b8b70L, 0xc76c51a3L,
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0xd192e819L, 0xd6990624L, 0xf40e3585L, 0x106aa070L,
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0x19a4c116L, 0x1e376c08L, 0x2748774cL, 0x34b0bcb5L,
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0x391c0cb3L, 0x4ed8aa4aL, 0x5b9cca4fL, 0x682e6ff3L,
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0x748f82eeL, 0x78a5636fL, 0x84c87814L, 0x8cc70208L,
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0x90befffaL, 0xa4506cebL, 0xbef9a3f7L, 0xc67178f2L
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};
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static void sha256_transform(SHA_INFO *sha_info)
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{
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int i, j;
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uint8 *dp;
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uint32 T, T1, T2, A, B, C, D, E, F, G, H, W[64];
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dp = sha_info->data;
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#undef SWAP_DONE
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#if BYTEORDER == 1234
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#define SWAP_DONE
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for (i = 0; i < 16; ++i) {
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T = *((uint32 *) dp);
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dp += 4;
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W[i] =
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((T << 24) & 0xff000000) |
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((T << 8) & 0x00ff0000) |
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((T >> 8) & 0x0000ff00) | ((T >> 24) & 0x000000ff);
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}
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#endif
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#if BYTEORDER == 4321
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#define SWAP_DONE
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for (i = 0; i < 16; ++i) {
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T = *((uint32 *) dp);
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dp += 4;
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W[i] = TRUNC32(T);
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}
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#endif
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#if BYTEORDER == 12345678
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#define SWAP_DONE
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for (i = 0; i < 16; i += 2) {
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T = *((uint32 *) dp);
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dp += 8;
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W[i] = ((T << 24) & 0xff000000) | ((T << 8) & 0x00ff0000) |
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((T >> 8) & 0x0000ff00) | ((T >> 24) & 0x000000ff);
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T >>= 32;
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W[i+1] = ((T << 24) & 0xff000000) | ((T << 8) & 0x00ff0000) |
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((T >> 8) & 0x0000ff00) | ((T >> 24) & 0x000000ff);
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}
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#endif
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#if BYTEORDER == 87654321
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#define SWAP_DONE
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for (i = 0; i < 16; i += 2) {
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T = *((uint32 *) dp);
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dp += 8;
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W[i] = TRUNC32(T >> 32);
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W[i+1] = TRUNC32(T);
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}
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#endif
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#ifndef SWAP_DONE
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#error Unknown byte order -- you need to add code here
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#endif /* SWAP_DONE */
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A = sha_info->digest[0];
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B = sha_info->digest[1];
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C = sha_info->digest[2];
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D = sha_info->digest[3];
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E = sha_info->digest[4];
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F = sha_info->digest[5];
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G = sha_info->digest[6];
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H = sha_info->digest[7];
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for (i=16; i<64; i++)
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W[i] = TRUNC32(LSIG1(W[i-2]) + W[i-7] + LSIG0(W[i-15]) + W[i-16]);
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for (j=0; j<64; j++) {
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T1 = TRUNC32(H + USIG1(E) + CH(E, F, G) + K[j] + W[j]);
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T2 = TRUNC32(USIG0(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 = TRUNC32(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 = TRUNC32(T1 + T2);
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}
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sha_info->digest[0] = TRUNC32(sha_info->digest[0] + A);
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sha_info->digest[1] = TRUNC32(sha_info->digest[1] + B);
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sha_info->digest[2] = TRUNC32(sha_info->digest[2] + C);
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sha_info->digest[3] = TRUNC32(sha_info->digest[3] + D);
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sha_info->digest[4] = TRUNC32(sha_info->digest[4] + E);
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sha_info->digest[5] = TRUNC32(sha_info->digest[5] + F);
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sha_info->digest[6] = TRUNC32(sha_info->digest[6] + G);
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sha_info->digest[7] = TRUNC32(sha_info->digest[7] + H);
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}
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void sha256_init(SHA_INFO *sha_info)
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{
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sha_info->digest[0] = 0x6a09e667L;
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sha_info->digest[1] = 0xbb67ae85L;
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sha_info->digest[2] = 0x3c6ef372L;
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sha_info->digest[3] = 0xa54ff53aL;
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sha_info->digest[4] = 0x510e527fL;
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sha_info->digest[5] = 0x9b05688cL;
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sha_info->digest[6] = 0x1f83d9abL;
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sha_info->digest[7] = 0x5be0cd19L;
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sha_info->count_lo = 0L;
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sha_info->count_hi = 0L;
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sha_info->local = 0;
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memset((uint8 *)sha_info->data, 0, SHA_BLOCKSIZE);
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}
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/* Update the SHA digest
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*/
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void sha256_update(SHA_INFO *sha_info, uint8 *buffer, int count)
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{
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int i;
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uint32 clo;
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clo = TRUNC32(sha_info->count_lo + ((uint8) count << 3));
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if (clo < sha_info->count_lo) {
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sha_info->count_hi++;
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}
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sha_info->count_lo = clo;
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sha_info->count_hi += (uint8) count >> 29;
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if (sha_info->local) {
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i = SHA_BLOCKSIZE - sha_info->local;
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if (i > count) {
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i = count;
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}
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memcpy(((uint8 *) sha_info->data) + sha_info->local, buffer, i);
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count -= i;
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buffer += i;
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sha_info->local += i;
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if (sha_info->local == SHA_BLOCKSIZE) {
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sha256_transform(sha_info);
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} else {
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return;
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}
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}
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while (count >= SHA_BLOCKSIZE) {
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memcpy(sha_info->data, buffer, SHA_BLOCKSIZE);
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buffer += SHA_BLOCKSIZE;
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count -= SHA_BLOCKSIZE;
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sha256_transform(sha_info);
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}
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memcpy(sha_info->data, buffer, count);
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sha_info->local = count;
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}
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/* Finish computing the SHA digest
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*/
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void sha256_final(SHA_INFO *sha_info)
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{
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int count;
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uint32 lo_bit_count, hi_bit_count;
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lo_bit_count = sha_info->count_lo;
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hi_bit_count = sha_info->count_hi;
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count = (int) ((lo_bit_count >> 3) & 0x3f);
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((uint8 *) sha_info->data)[count++] = 0x80;
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if (count > SHA_BLOCKSIZE - 8) {
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memset(((uint8 *) sha_info->data) + count, 0, SHA_BLOCKSIZE - count);
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sha256_transform(sha_info);
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memset((uint8 *) sha_info->data, 0, SHA_BLOCKSIZE - 8);
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} else {
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memset(((uint8 *) sha_info->data) + count, 0,
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SHA_BLOCKSIZE - 8 - count);
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}
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sha_info->data[56] = (hi_bit_count >> 24) & 0xff;
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sha_info->data[57] = (hi_bit_count >> 16) & 0xff;
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sha_info->data[58] = (hi_bit_count >> 8) & 0xff;
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sha_info->data[59] = (hi_bit_count >> 0) & 0xff;
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sha_info->data[60] = (lo_bit_count >> 24) & 0xff;
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sha_info->data[61] = (lo_bit_count >> 16) & 0xff;
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sha_info->data[62] = (lo_bit_count >> 8) & 0xff;
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sha_info->data[63] = (lo_bit_count >> 0) & 0xff;
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sha256_transform(sha_info);
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}
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void sha256_unpackdigest(uint8 digest[32], SHA_INFO *sha_info)
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{
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digest[ 0] = (unsigned char) ((sha_info->digest[0] >> 24) & 0xff);
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digest[ 1] = (unsigned char) ((sha_info->digest[0] >> 16) & 0xff);
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digest[ 2] = (unsigned char) ((sha_info->digest[0] >> 8) & 0xff);
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digest[ 3] = (unsigned char) ((sha_info->digest[0] ) & 0xff);
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digest[ 4] = (unsigned char) ((sha_info->digest[1] >> 24) & 0xff);
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digest[ 5] = (unsigned char) ((sha_info->digest[1] >> 16) & 0xff);
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digest[ 6] = (unsigned char) ((sha_info->digest[1] >> 8) & 0xff);
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digest[ 7] = (unsigned char) ((sha_info->digest[1] ) & 0xff);
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digest[ 8] = (unsigned char) ((sha_info->digest[2] >> 24) & 0xff);
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digest[ 9] = (unsigned char) ((sha_info->digest[2] >> 16) & 0xff);
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digest[10] = (unsigned char) ((sha_info->digest[2] >> 8) & 0xff);
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digest[11] = (unsigned char) ((sha_info->digest[2] ) & 0xff);
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digest[12] = (unsigned char) ((sha_info->digest[3] >> 24) & 0xff);
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digest[13] = (unsigned char) ((sha_info->digest[3] >> 16) & 0xff);
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digest[14] = (unsigned char) ((sha_info->digest[3] >> 8) & 0xff);
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digest[15] = (unsigned char) ((sha_info->digest[3] ) & 0xff);
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digest[16] = (unsigned char) ((sha_info->digest[4] >> 24) & 0xff);
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digest[17] = (unsigned char) ((sha_info->digest[4] >> 16) & 0xff);
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digest[18] = (unsigned char) ((sha_info->digest[4] >> 8) & 0xff);
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digest[19] = (unsigned char) ((sha_info->digest[4] ) & 0xff);
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digest[20] = (unsigned char) ((sha_info->digest[5] >> 24) & 0xff);
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digest[21] = (unsigned char) ((sha_info->digest[5] >> 16) & 0xff);
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digest[22] = (unsigned char) ((sha_info->digest[5] >> 8) & 0xff);
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digest[23] = (unsigned char) ((sha_info->digest[5] ) & 0xff);
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digest[24] = (unsigned char) ((sha_info->digest[6] >> 24) & 0xff);
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digest[25] = (unsigned char) ((sha_info->digest[6] >> 16) & 0xff);
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digest[26] = (unsigned char) ((sha_info->digest[6] >> 8) & 0xff);
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digest[27] = (unsigned char) ((sha_info->digest[6] ) & 0xff);
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digest[28] = (unsigned char) ((sha_info->digest[7] >> 24) & 0xff);
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digest[29] = (unsigned char) ((sha_info->digest[7] >> 16) & 0xff);
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digest[30] = (unsigned char) ((sha_info->digest[7] >> 8) & 0xff);
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digest[31] = (unsigned char) ((sha_info->digest[7] ) & 0xff);
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}
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/***EOF***/
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