C 语言版 SHA1算法
/* SHA-1 in C By Steve Reid <steve@edmweb.com> 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 */ /* #define LITTLE_ENDIAN * This should be #define 'd if true. */ /* #define SHA1HANDSOFF * Copies data before messing with it. */ #include <stdio.h> #include <string.h>typedef struct{ unsigned long state; unsigned long count; unsigned char buffer; } SHA1_CTX; void SHA1Transform(unsigned long state, unsigned char buffer); void SHA1Init(SHA1_CTX* context); void SHA1Update(SHA1_CTX* context, unsigned char* data, unsigned int len); void SHA1Final(unsigned char digest, SHA1_CTX* context); #define rol(value, bits) (((value) << (bits)) | ((value) >> (32 - (bits)))) /* blk0() and blk() perform the initial expand. */ /* I got the idea of expanding during the round function from SSLeay */ #ifdef LITTLE_ENDIAN #define blk0(i) (block-> l = (rol(block-> l,24)&0xFF00FF00)|(rol(block-> l,8)&0x00FF00FF)) #else #define blk0(i) block-> l #endif #define blk(i) (block-> l = rol(block-> l[(i+13)&15]^block-> l[(i+8)&15]^block-> l[(i+2)&15]^block-> l,1)) /* (R0+R1), R2, R3, R4 are the different operations used in SHA1 */ #define R0(v,w,x,y,z,i) z+=((w&(x^y))^y)+blk0(i)+0x5A827999+rol(v,5);w=rol(w,30); #define R1(v,w,x,y,z,i) z+=((w&(x^y))^y)+blk(i)+0x5A827999+rol(v,5);w=rol(w,30); #define R2(v,w,x,y,z,i) z+=(w^x^y)+blk(i)+0x6ED9EBA1+rol(v,5);w=rol(w,30); #define R3(v,w,x,y,z,i) z+=(((w|x)&y)|(w&x))+blk(i)+0x8F1BBCDC+rol(v,5);w=rol(w,30); #define R4(v,w,x,y,z,i) z+=(w^x^y)+blk(i)+0xCA62C1D6+rol(v,5);w=rol(w,30); /* Hash a single 512-bit block. This is the core of the algorithm. */ void SHA1Transform(unsigned long state, unsigned char buffer) { unsigned long a, b, c, d, e; typedef union { unsigned char c; unsigned long l; } CHAR64LONG16; CHAR64LONG16* block; #ifdef SHA1HANDSOFF static unsigned char workspace; block = (CHAR64LONG16*)workspace; memcpy(block, buffer, 64); #else block = (CHAR64LONG16*)buffer; #endif /* Copy context-> state[] to working vars */ a = state; b = state; c = state; d = state; e = state; /* 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 += a; state += b; state += c; state += d; state += e; /* Wipe variables */ a = b = c = d = e = 0; } /* SHA1Init - Initialize new context */ void SHA1Init(SHA1_CTX* context) { /* SHA1 initialization constants */ context-> state = 0x67452301; context-> state = 0xEFCDAB89; context-> state = 0x98BADCFE; context-> state = 0x10325476; context-> state = 0xC3D2E1F0; context-> count = context-> count = 0; } /* Run your data through this. */ void SHA1Update(SHA1_CTX* context, unsigned char* data, unsigned int len) { unsigned int i, j; j = (context-> count >> 3) & 63; if ((context-> count += len << 3) < (len << 3)) context-> count++; context-> count += (len >> 29); if ((j + len) > 63) { memcpy(&context-> buffer, data, (i = 64-j)); SHA1Transform(context-> state, context-> buffer); for ( ; i + 63 < len; i += 64) { SHA1Transform(context-> state, &data); } j = 0; } else i = 0; memcpy(&context-> buffer, &data, len - i); } /* Add padding and return the message digest. */ void SHA1Final(unsigned char digest, SHA1_CTX* context) { unsigned long i, j; unsigned char finalcount; for (i = 0; i < 8; i++) { finalcount = (unsigned char)((context-> count[(i >= 4 ? 0 : 1)] >> ((3-(i & 3)) * 8) ) & 255); /* Endian independent */ } SHA1Update(context, (unsigned char *) "\200 ", 1); while ((context-> count & 504) != 448) { SHA1Update(context, (unsigned char *) "\0 ", 1); } SHA1Update(context, finalcount, 8); /* Should cause a SHA1Transform() */ for (i = 0; i < 20; i++) { digest = (unsigned char) ((context-> state >> ((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 } /*************************************************************/ int main(int argc, char** argv) { int i, j; SHA1_CTX context; unsigned char digest, buffer; FILE* file; if (argc > 2) { puts( "Public domain SHA-1 implementation - by Steve Reid <steve@edmweb.com> "); puts( "Produces the SHA-1 hash of a file, or stdin if no file is specified. "); exit(0); } if (argc < 2) { file = stdin; } else { if (!(file = fopen(argv, "rb "))) { fputs( "Unable to open file. ", stderr); exit(-1); } } SHA1Init(&context); while (!feof(file)) { /* note: what if ferror(file) */ i = fread(buffer, 1, 16384, file); SHA1Update(&context, buffer, i); } SHA1Final(digest, &context); fclose(file); for (i = 0; i < 5; i++) { for (j = 0; j < 4; j++) { printf( "%02X ", digest); } putchar(' '); } putchar('\n'); exit(0); }
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