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/* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is SHA 180-1 Reference Implementation (Compact version).
*
* The Initial Developer of the Original Code is
* Paul Kocher of Cryptography Research.
* Portions created by the Initial Developer are Copyright (C) 1995-9
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
*
* Alternatively, the contents of this file may be used under the terms of
* either the GNU General Public License Version 2 or later (the "GPL"), or
* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
#include "sha.h"
static void shaHashBlock(SHA_CTX *ctx);
void shaInit(SHA_CTX *ctx) {
int i;
ctx->lenW = 0;
ctx->sizeHi = ctx->sizeLo = 0;
/* Initialize H with the magic constants (see FIPS180 for constants)
*/
ctx->H[0] = 0x67452301L;
ctx->H[1] = 0xefcdab89L;
ctx->H[2] = 0x98badcfeL;
ctx->H[3] = 0x10325476L;
ctx->H[4] = 0xc3d2e1f0L;
for (i = 0; i < 80; i++)
ctx->W[i] = 0;
}
void shaUpdate(SHA_CTX *ctx, unsigned char *dataIn, int len) {
int i;
/* Read the data into W and process blocks as they get full
*/
for (i = 0; i < len; i++) {
ctx->W[ctx->lenW / 4] <<= 8;
ctx->W[ctx->lenW / 4] |= (unsigned long)dataIn[i];
if ((++ctx->lenW) % 64 == 0) {
shaHashBlock(ctx);
ctx->lenW = 0;
}
ctx->sizeLo += 8;
ctx->sizeHi += (ctx->sizeLo < 8);
}
}
void shaFinal(SHA_CTX *ctx, unsigned char hashout[20]) {
unsigned char pad0x80 = 0x80;
unsigned char pad0x00 = 0x00;
unsigned char padlen[8];
int i;
/* Pad with a binary 1 (e.g. 0x80), then zeroes, then length
*/
padlen[0] = (unsigned char)((ctx->sizeHi >> 24) & 255);
padlen[1] = (unsigned char)((ctx->sizeHi >> 16) & 255);
padlen[2] = (unsigned char)((ctx->sizeHi >> 8) & 255);
padlen[3] = (unsigned char)((ctx->sizeHi >> 0) & 255);
padlen[4] = (unsigned char)((ctx->sizeLo >> 24) & 255);
padlen[5] = (unsigned char)((ctx->sizeLo >> 16) & 255);
padlen[6] = (unsigned char)((ctx->sizeLo >> 8) & 255);
padlen[7] = (unsigned char)((ctx->sizeLo >> 0) & 255);
shaUpdate(ctx, &pad0x80, 1);
while (ctx->lenW != 56)
shaUpdate(ctx, &pad0x00, 1);
shaUpdate(ctx, padlen, 8);
/* Output hash
*/
for (i = 0; i < 20; i++) {
hashout[i] = (unsigned char)(ctx->H[i / 4] >> 24);
ctx->H[i / 4] <<= 8;
}
/*
* Re-initialize the context (also zeroizes contents)
*/
shaInit(ctx);
}
void shaBlock(unsigned char *dataIn, int len, unsigned char hashout[20]) {
SHA_CTX ctx;
shaInit(&ctx);
shaUpdate(&ctx, dataIn, len);
shaFinal(&ctx, hashout);
}
#define SHA_ROTL(X,n) (((X) << (n)) | ((X) >> (32-(n))))
static void shaHashBlock(SHA_CTX *ctx) {
int t;
unsigned long A,B,C,D,E,TEMP;
for (t = 16; t <= 79; t++)
ctx->W[t] =
SHA_ROTL(ctx->W[t-3] ^ ctx->W[t-8] ^ ctx->W[t-14] ^ ctx->W[t-16], 1);
A = ctx->H[0];
B = ctx->H[1];
C = ctx->H[2];
D = ctx->H[3];
E = ctx->H[4];
for (t = 0; t <= 19; t++) {
TEMP = SHA_ROTL(A,5) + (((C^D)&B)^D) + E + ctx->W[t] + 0x5a827999L;
E = D; D = C; C = SHA_ROTL(B, 30); B = A; A = TEMP;
}
for (t = 20; t <= 39; t++) {
TEMP = SHA_ROTL(A,5) + (B^C^D) + E + ctx->W[t] + 0x6ed9eba1L;
E = D; D = C; C = SHA_ROTL(B, 30); B = A; A = TEMP;
}
for (t = 40; t <= 59; t++) {
TEMP = SHA_ROTL(A,5) + ((B&C)|(D&(B|C))) + E + ctx->W[t] + 0x8f1bbcdcL;
E = D; D = C; C = SHA_ROTL(B, 30); B = A; A = TEMP;
}
for (t = 60; t <= 79; t++) {
TEMP = SHA_ROTL(A,5) + (B^C^D) + E + ctx->W[t] + 0xca62c1d6L;
E = D; D = C; C = SHA_ROTL(B, 30); B = A; A = TEMP;
}
ctx->H[0] += A;
ctx->H[1] += B;
ctx->H[2] += C;
ctx->H[3] += D;
ctx->H[4] += E;
}
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