SHA.zip_SHA_SHA2011功能法

/* SHA-1 in C By Steve Reid <[email protected]> 100% Public Domain Test Vectors (from FIPS PUB 180-1) "abc" A9993E36 4706816A BA3E2571 7850C26C 9CD0D89D "abcdbcdecdefdefgefghfghighijhijkijkljklmklmnlmnomnopnopq" 84983E44 1C3BD26E BAAE4AA1 F95129E5 E54670F1 A million repetitions of "a" 34AA973C D4C4DAA4 F61EEB2B DBAD2731 6534016F */ #include <string.h> /* for memcpy() */ #include "sha1.h" /* Hash a single 512-bit block. This is the core of the algorithm. */ void SHA1Transform (unsigned long state[5], unsigned char buffer[64]) { unsigned long a, b, c, d, e; typedef union { unsigned char c[64]; unsigned long l[16]; } CHAR64LONG16; CHAR64LONG16* block; #ifdef SHA1HANDSOFF static unsigned char workspace[64]; block = (CHAR64LONG16*) workspace; memcpy (block, buffer, 64); #else block = (CHAR64LONG16*) buffer; #endif /* Copy context->state[] to working vars */ a = state[0]; b = state[1]; c = state[2]; d = state[3]; e = state[4]; /* 4 rounds of 20 operations each. Loop unrolled. */ 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); 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); 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); 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); 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); 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); 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); 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); 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); 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); 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); 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); 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); 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); 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); 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); 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); 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); 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); 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); /* Add the working vars back into context.state[] */ state[0] += a; state[1] += b; state[2] += c; state[3] += d; state[4] += e; /* Wipe variables */ a = b = c = d = e = 0; } /* SHA1Init - Initialize new context */ void SHA1Init(SHA1_CTX* context) { /* SHA1 initialization constants */ context->state[0] = 0x67452301; context->state[1] = 0xEFCDAB89; context->state[2] = 0x98BADCFE; context->state[3] = 0x10325476; context->state[4] = 0xC3D2E1F0; context->count[0] = context->count[1] = 0; } /* Run your data through this. */ void SHA1Update (SHA1_CTX* context, unsigned char* data, unsigned int len) { unsigned int i, j; j = (context->count[0] >> 3) & 63; if ((context->count[0] += len << 3) < (len << 3)) context->count[1]++; context->count[1] += (len >> 29); if ((j + len) > 63) { memcpy(&context->buffer[j], data, (i = 64-j)); SHA1Transform(context->state, context->buffer); for ( ; i + 63 < len; i += 64) { SHA1Transform(context->state, &data[i]); } j = 0; } else i = 0; memcpy(&context->buffer[j], &data[i], len - i); } /* Add padding and return the message digest. */ void SHA1Final (unsigned char digest [20], SHA1_CTX* context) { unsigned long i, j; unsigned char finalcount[8]; for (i = 0; i < 8; i++) { finalcount[i] = (unsigned char)((context->count[(i >= 4 ? 0 : 1)] >> ((3-(i & 3)) * 8) ) & 255); /* Endian independent */ } SHA1Update (context, (unsigned char *)"\200", 1); while ((context->count[0] & 504) != 448) { SHA1Update (context, (unsigned char *)"\0", 1); } SHA1Update (context, finalcount, 8); /* Should cause a SHA1Transform() */ for (i = 0; i < 20; i++) { digest[i] = (unsigned char) ((context->state[i>>2] >> ((3-(i & 3)) * 8) ) & 255); } /* Wipe variables */ i = j = 0; memset(context->buffer, 0, 64); memset(context->state, 0, 20); memset(context->count, 0, 8); memset(&finalcount, 0, 8); #ifdef SHA1HANDSOFF /* make SHA1Transform overwrite it's own static vars */ SHA1Transform(context->state, context->buffer); #endif }