257 lines
6.6 KiB
C
257 lines
6.6 KiB
C
/*
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* SHA-1 in C by Steve Reid <steve@edmweb.com>
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* 100% Public Domain
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*
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* Test Vectors (from FIPS PUB 180-1)
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* 1) "abc": A9993E36 4706816A BA3E2571 7850C26C 9CD0D89D
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* 2) "abcdbcdecdefdefgefghfghighijhijkijkljklmklmnlmnomnopnopq": 84983E44 1C3BD26E BAAE4AA1 F95129E5 E54670F1
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* 3) A million repetitions of "a": 34AA973C D4C4DAA4 F61EEB2B DBAD2731 6534016F
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*/
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#define UL_SHA1HANDSOFF
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#include <stdio.h>
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#include <string.h>
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#include <stdint.h>
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#include "sha1.h"
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#define rol(value, bits) (((value) << (bits)) | ((value) >> (32 - (bits))))
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/* blk0() and blk() perform the initial expand. */
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#ifdef WORDS_BIGENDIAN
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# define blk0(i) block->l[i]
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#else
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# define blk0(i) (block->l[i] = (rol(block->l[i],24)&0xFF00FF00) \
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|(rol(block->l[i],8)&0x00FF00FF))
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#endif
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#define blk(i) (block->l[i&15] = rol(block->l[(i+13)&15]^block->l[(i+8)&15] \
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^block->l[(i+2)&15]^block->l[i&15],1))
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/* (R0+R1), R2, R3, R4 are the different operations used in SHA1 */
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#define R0(v,w,x,y,z,i) z+=((w&(x^y))^y)+blk0(i)+0x5A827999+rol(v,5);w=rol(w,30);
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#define R1(v,w,x,y,z,i) z+=((w&(x^y))^y)+blk(i)+0x5A827999+rol(v,5);w=rol(w,30);
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#define R2(v,w,x,y,z,i) z+=(w^x^y)+blk(i)+0x6ED9EBA1+rol(v,5);w=rol(w,30);
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#define R3(v,w,x,y,z,i) z+=(((w|x)&y)|(w&x))+blk(i)+0x8F1BBCDC+rol(v,5);w=rol(w,30);
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#define R4(v,w,x,y,z,i) z+=(w^x^y)+blk(i)+0xCA62C1D6+rol(v,5);w=rol(w,30);
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/* Hash a single 512-bit block. This is the core of the algorithm. */
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void ul_SHA1Transform(uint32_t state[5], const unsigned char buffer[64])
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{
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uint32_t a, b, c, d, e;
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typedef union {
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unsigned char c[64];
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uint32_t l[16];
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} CHAR64LONG16;
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#ifdef UL_SHA1HANDSOFF
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CHAR64LONG16 block[1]; /* use array to appear as a pointer */
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memcpy(block, buffer, 64);
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#else
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/* The following had better never be used because it causes the
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* pointer-to-const buffer to be cast into a pointer to non-const.
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* And the result is written through. I threw a "const" in, hoping
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* this will cause a diagnostic.
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*/
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CHAR64LONG16 *block = (const CHAR64LONG16 *)buffer;
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#endif
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/* Copy context->state[] to working vars */
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a = state[0];
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b = state[1];
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c = state[2];
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d = state[3];
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e = state[4];
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/* 4 rounds of 20 operations each. Loop unrolled. */
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R0(a, b, c, d, e, 0);
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R0(e, a, b, c, d, 1);
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R0(d, e, a, b, c, 2);
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R0(c, d, e, a, b, 3);
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R0(b, c, d, e, a, 4);
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R0(a, b, c, d, e, 5);
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R0(e, a, b, c, d, 6);
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R0(d, e, a, b, c, 7);
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R0(c, d, e, a, b, 8);
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R0(b, c, d, e, a, 9);
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R0(a, b, c, d, e, 10);
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R0(e, a, b, c, d, 11);
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R0(d, e, a, b, c, 12);
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R0(c, d, e, a, b, 13);
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R0(b, c, d, e, a, 14);
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R0(a, b, c, d, e, 15);
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R1(e, a, b, c, d, 16);
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R1(d, e, a, b, c, 17);
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R1(c, d, e, a, b, 18);
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R1(b, c, d, e, a, 19);
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R2(a, b, c, d, e, 20);
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R2(e, a, b, c, d, 21);
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R2(d, e, a, b, c, 22);
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R2(c, d, e, a, b, 23);
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R2(b, c, d, e, a, 24);
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R2(a, b, c, d, e, 25);
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R2(e, a, b, c, d, 26);
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R2(d, e, a, b, c, 27);
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R2(c, d, e, a, b, 28);
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R2(b, c, d, e, a, 29);
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R2(a, b, c, d, e, 30);
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R2(e, a, b, c, d, 31);
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R2(d, e, a, b, c, 32);
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R2(c, d, e, a, b, 33);
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R2(b, c, d, e, a, 34);
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R2(a, b, c, d, e, 35);
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R2(e, a, b, c, d, 36);
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R2(d, e, a, b, c, 37);
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R2(c, d, e, a, b, 38);
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R2(b, c, d, e, a, 39);
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R3(a, b, c, d, e, 40);
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R3(e, a, b, c, d, 41);
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R3(d, e, a, b, c, 42);
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R3(c, d, e, a, b, 43);
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R3(b, c, d, e, a, 44);
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R3(a, b, c, d, e, 45);
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R3(e, a, b, c, d, 46);
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R3(d, e, a, b, c, 47);
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R3(c, d, e, a, b, 48);
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R3(b, c, d, e, a, 49);
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R3(a, b, c, d, e, 50);
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R3(e, a, b, c, d, 51);
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R3(d, e, a, b, c, 52);
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R3(c, d, e, a, b, 53);
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R3(b, c, d, e, a, 54);
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R3(a, b, c, d, e, 55);
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R3(e, a, b, c, d, 56);
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R3(d, e, a, b, c, 57);
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R3(c, d, e, a, b, 58);
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R3(b, c, d, e, a, 59);
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R4(a, b, c, d, e, 60);
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R4(e, a, b, c, d, 61);
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R4(d, e, a, b, c, 62);
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R4(c, d, e, a, b, 63);
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R4(b, c, d, e, a, 64);
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R4(a, b, c, d, e, 65);
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R4(e, a, b, c, d, 66);
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R4(d, e, a, b, c, 67);
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R4(c, d, e, a, b, 68);
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R4(b, c, d, e, a, 69);
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R4(a, b, c, d, e, 70);
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R4(e, a, b, c, d, 71);
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R4(d, e, a, b, c, 72);
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R4(c, d, e, a, b, 73);
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R4(b, c, d, e, a, 74);
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R4(a, b, c, d, e, 75);
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R4(e, a, b, c, d, 76);
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R4(d, e, a, b, c, 77);
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R4(c, d, e, a, b, 78);
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R4(b, c, d, e, a, 79);
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/* Add the working vars back into context.state[] */
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state[0] += a;
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state[1] += b;
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state[2] += c;
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state[3] += d;
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state[4] += e;
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/* Wipe variables */
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a = b = c = d = e = 0;
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#ifdef UL_SHA1HANDSOFF
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memset(block, '\0', sizeof(block));
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#endif
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}
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/* SHA1Init - Initialize new context */
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void ul_SHA1Init(UL_SHA1_CTX *context)
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{
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/* SHA1 initialization constants */
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context->state[0] = 0x67452301;
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context->state[1] = 0xEFCDAB89;
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context->state[2] = 0x98BADCFE;
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context->state[3] = 0x10325476;
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context->state[4] = 0xC3D2E1F0;
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context->count[0] = context->count[1] = 0;
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}
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/* Run your data through this. */
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void ul_SHA1Update(UL_SHA1_CTX *context, const unsigned char *data, uint32_t len)
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{
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uint32_t i;
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uint32_t j;
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j = context->count[0];
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if ((context->count[0] += len << 3) < j)
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context->count[1]++;
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context->count[1] += (len >> 29);
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j = (j >> 3) & 63;
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if ((j + len) > 63) {
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memcpy(&context->buffer[j], data, (i = 64 - j));
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ul_SHA1Transform(context->state, context->buffer);
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for (; i + 63 < len; i += 64) {
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ul_SHA1Transform(context->state, &data[i]);
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}
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j = 0;
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} else
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i = 0;
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memcpy(&context->buffer[j], &data[i], len - i);
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}
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/* Add padding and return the message digest. */
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void ul_SHA1Final(unsigned char digest[20], UL_SHA1_CTX *context)
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{
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unsigned i;
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unsigned char finalcount[8];
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unsigned char c;
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#if 0 /* untested "improvement" by DHR */
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/* Convert context->count to a sequence of bytes
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* in finalcount. Second element first, but
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* big-endian order within element.
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* But we do it all backwards.
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*/
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unsigned char *fcp = &finalcount[8];
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for (i = 0; i < 2; i++) {
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uint32_t t = context->count[i];
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int j;
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for (j = 0; j < 4; t >>= 8, j++)
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*--fcp = (unsigned char)t}
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#else
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for (i = 0; i < 8; i++) {
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finalcount[i] = (unsigned char)((context->count[(i >= 4 ? 0 : 1)] >> ((3 - (i & 3)) * 8)) & 255); /* Endian independent */
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}
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#endif
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c = 0200;
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ul_SHA1Update(context, &c, 1);
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while ((context->count[0] & 504) != 448) {
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c = 0000;
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ul_SHA1Update(context, &c, 1);
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}
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ul_SHA1Update(context, finalcount, 8); /* Should cause a SHA1Transform() */
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for (i = 0; i < 20; i++) {
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digest[i] = (unsigned char)
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((context->state[i >> 2] >> ((3 - (i & 3)) * 8)) & 255);
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}
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/* Wipe variables */
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memset(context, '\0', sizeof(*context));
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memset(&finalcount, '\0', sizeof(finalcount));
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}
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void ul_SHA1(char *hash_out, const char *str, unsigned len)
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{
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UL_SHA1_CTX ctx;
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unsigned int ii;
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ul_SHA1Init(&ctx);
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for (ii = 0; ii < len; ii += 1)
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ul_SHA1Update(&ctx, (const unsigned char *)str + ii, 1);
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ul_SHA1Final((unsigned char *)hash_out, &ctx);
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hash_out[20] = '\0';
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}
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