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138 lines
4.5 KiB
C
138 lines
4.5 KiB
C
/*
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* Based on the SHA-1 C implementation 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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* "abc"
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* A9993E36 4706816A BA3E2571 7850C26C 9CD0D89D
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* "abcdbcdecdefdefgefghfghighijhijkijkljklmklmnlmnomnopnopq"
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* 84983E44 1C3BD26E BAAE4AA1 F95129E5 E54670F1
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* A million repetitions of "a"
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* 34AA973C D4C4DAA4 F61EEB2B DBAD2731 6534016F
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*/
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#include "stdinc.h"
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#include <netinet/in.h> // for htonl()
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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. blk0() deals with host endianess
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#define blk0(i) (block[i] = htonl(block[i]))
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#define blk(i) (block[i&15] = rol(block[(i+13)&15]^block[(i+8)&15]^block[(i+2)&15]^block[i&15],1))
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// (R0+R1), R2, R3, R4 are the different operations (rounds) 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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static uint32_t sha1_transform(SHA1 *sha1, const uint8_t buffer[SHA1_BLOCK_LENGTH]) {
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uint32_t a, b, c, d, e;
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uint32_t block[SHA1_BLOCK_LENGTH / 4];
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memcpy(&block, buffer, SHA1_BLOCK_LENGTH);
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// copy sha1->state[] to working variables
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a = sha1->state[0];
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b = sha1->state[1];
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c = sha1->state[2];
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d = sha1->state[3];
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e = sha1->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); R0(e,a,b,c,d, 1); R0(d,e,a,b,c, 2); R0(c,d,e,a,b, 3);
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R0(b,c,d,e,a, 4); R0(a,b,c,d,e, 5); R0(e,a,b,c,d, 6); R0(d,e,a,b,c, 7);
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R0(c,d,e,a,b, 8); R0(b,c,d,e,a, 9); R0(a,b,c,d,e,10); R0(e,a,b,c,d,11);
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R0(d,e,a,b,c,12); R0(c,d,e,a,b,13); R0(b,c,d,e,a,14); R0(a,b,c,d,e,15);
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R1(e,a,b,c,d,16); R1(d,e,a,b,c,17); R1(c,d,e,a,b,18); R1(b,c,d,e,a,19);
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R2(a,b,c,d,e,20); R2(e,a,b,c,d,21); R2(d,e,a,b,c,22); R2(c,d,e,a,b,23);
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R2(b,c,d,e,a,24); R2(a,b,c,d,e,25); R2(e,a,b,c,d,26); R2(d,e,a,b,c,27);
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R2(c,d,e,a,b,28); R2(b,c,d,e,a,29); R2(a,b,c,d,e,30); R2(e,a,b,c,d,31);
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R2(d,e,a,b,c,32); R2(c,d,e,a,b,33); R2(b,c,d,e,a,34); R2(a,b,c,d,e,35);
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R2(e,a,b,c,d,36); R2(d,e,a,b,c,37); R2(c,d,e,a,b,38); R2(b,c,d,e,a,39);
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R3(a,b,c,d,e,40); R3(e,a,b,c,d,41); R3(d,e,a,b,c,42); R3(c,d,e,a,b,43);
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R3(b,c,d,e,a,44); R3(a,b,c,d,e,45); R3(e,a,b,c,d,46); R3(d,e,a,b,c,47);
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R3(c,d,e,a,b,48); R3(b,c,d,e,a,49); R3(a,b,c,d,e,50); R3(e,a,b,c,d,51);
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R3(d,e,a,b,c,52); R3(c,d,e,a,b,53); R3(b,c,d,e,a,54); R3(a,b,c,d,e,55);
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R3(e,a,b,c,d,56); R3(d,e,a,b,c,57); R3(c,d,e,a,b,58); R3(b,c,d,e,a,59);
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R4(a,b,c,d,e,60); R4(e,a,b,c,d,61); R4(d,e,a,b,c,62); R4(c,d,e,a,b,63);
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R4(b,c,d,e,a,64); R4(a,b,c,d,e,65); R4(e,a,b,c,d,66); R4(d,e,a,b,c,67);
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R4(c,d,e,a,b,68); R4(b,c,d,e,a,69); R4(a,b,c,d,e,70); R4(e,a,b,c,d,71);
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R4(d,e,a,b,c,72); R4(c,d,e,a,b,73); R4(b,c,d,e,a,74); R4(a,b,c,d,e,75);
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R4(e,a,b,c,d,76); R4(d,e,a,b,c,77); R4(c,d,e,a,b,78); R4(b,c,d,e,a,79);
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// add the working variables back into sha1->state[]
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sha1->state[0] += a;
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sha1->state[1] += b;
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sha1->state[2] += c;
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sha1->state[3] += d;
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sha1->state[4] += e;
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// wipe variables
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a = b = c = d = e = 0;
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return a; // return a to avoid dead-store warning from clang static analyzer
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}
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void sha1_init(SHA1 *sha1) {
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sha1->state[0] = 0x67452301;
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sha1->state[1] = 0xEFCDAB89;
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sha1->state[2] = 0x98BADCFE;
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sha1->state[3] = 0x10325476;
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sha1->state[4] = 0xC3D2E1F0;
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sha1->count = 0;
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}
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void sha1_update(SHA1 *sha1, const uint8_t *data, size_t length) {
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size_t i, j;
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j = (size_t)((sha1->count >> 3) & 63);
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sha1->count += (length << 3);
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if ((j + length) > 63) {
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i = 64 - j;
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memcpy(&sha1->buffer[j], data, i);
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sha1_transform(sha1, sha1->buffer);
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for (; i + 63 < length; i += 64) {
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sha1_transform(sha1, &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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}
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memcpy(&sha1->buffer[j], &data[i], length - i);
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}
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void sha1_final(SHA1 *sha1, uint8_t digest[SHA1_DIGEST_LENGTH]) {
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uint32_t i;
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uint8_t count[8];
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for (i = 0; i < 8; i++) {
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// this is endian independent
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count[i] = (uint8_t)((sha1->count >> ((7 - (i & 7)) * 8)) & 255);
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}
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sha1_update(sha1, (uint8_t *)"\200", 1);
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while ((sha1->count & 504) != 448) {
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sha1_update(sha1, (uint8_t *)"\0", 1);
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}
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sha1_update(sha1, count, 8);
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for (i = 0; i < SHA1_DIGEST_LENGTH; i++) {
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digest[i] = (uint8_t)((sha1->state[i >> 2] >> ((3 - (i & 3)) * 8)) & 255);
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}
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memset(sha1, 0, sizeof(*sha1));
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}
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