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Diffstat (limited to 'src/sha1.c')
| -rw-r--r-- | src/sha1.c | 188 |
1 files changed, 188 insertions, 0 deletions
diff --git a/src/sha1.c b/src/sha1.c new file mode 100644 index 0000000..ee06e92 --- /dev/null +++ b/src/sha1.c @@ -0,0 +1,188 @@ +/* +SHA-1 in C +By Steve Reid <sreid@sea-to-sky.net> +100% Public Domain + +----------------- +Modified 7/98 +By James H. Brown <jbrown@burgoyne.com> +Still 100% Public Domain + +----------------- +Adopted for s/qmail 2/2020 +feh +Still 100% Public Domain; though requiring fehQlibs-14 + +*/ + +#include <string.h> +#include "sha1.h" +#include "byte.h" + +// #define SHA1HANDSOFF + +#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 */ +/* FIXME: can we do this in an endian-proof way? */ +#ifndef WORDS_BIGENDIAN +#define blk0(i) (block->l[i] = (rol(block->l[i],24) & 0xFF00FF00) \ + | (rol(block->l[i],8) & 0x00FF00FF)) +#else +#define blk0(i) block->l[i] +#endif +#define blk(i) (block->l[i&15] = rol(block->l[(i+13)&15]^block->l[(i+8)&15] \ + ^block->l[(i+2)&15]^block->l[i&15],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 sha1_transform(uint32_t state[5],const uint8_t buffer[SHA1_BLOCKSIZE]) +{ + uint32_t a, b, c, d, e; + typedef union { + uint8_t c[SHA1_BLOCKSIZE]; + uint32_t l[16]; + } CHAR64LONG16; + CHAR64LONG16 *block; + +#ifdef SHA1HANDSOFF + static uint8_t workspace[SHA1_BLOCKSIZE]; + + block = (CHAR64LONG16 *) workspace; + byte_copy(block,SHA1_BLOCKSIZE,buffer); +#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; + +#ifdef SHA1HANDSOFF + byte_zero(block,64); +#endif +} + +/* SHA1Init - Initialize new context */ + +void sha1_init(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 sha1_update(sha1_ctx *context,const uint8_t *data,uint32_t len) +{ + uint32_t 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) { + byte_copy(&context->buffer[j],(i = 64 - j),data); + sha1_transform(context->state,context->buffer); + for (; i + 63 < len; i += 64) { + sha1_transform(context->state,data + i); + } + j = 0; + } else + i = 0; + byte_copy(&context->buffer[j],len - i,&data[i]); +} + +/* Add padding and return the message digest. */ + +void sha1_final(uint8_t digest[SHA1_DIGESTSIZE],sha1_ctx *context) +{ + uint32_t i; + uint8_t finalcount[8]; + + for (i = 0; i < 8; i++) { + finalcount[i] = (uint8_t)((context->count[(i >= 4 ? 0 : 1)] + >> ((3 - (i & 3)) * 8)) & 255); /* Endian independent */ + } + sha1_update(context,(uint8_t *) "\200",1); + + while ((context->count[0] & 504) != 448) + sha1_update(context,(uint8_t *) "\0",1); + + sha1_update(context,finalcount,8); /* Should cause a SHA1_Transform() */ + + for (i = 0; i < SHA1_DIGESTSIZE; i++) + digest[i] = (uint8_t) ((context->state[i >> 2] >> ((3 - (i & 3)) * 8)) & 255); + + /* Wipe variables */ + i = 0; + byte_zero(context->buffer,64); + byte_zero(context->state,20); + byte_zero(context->count,8); + byte_zero(finalcount,8); + +#ifdef SHA1HANDSOFF /* make SHA1Transform overwrite its own static vars */ + sha1_transform(context->state,context->buffer); +#endif +} + +void sha1_hash(char *hash,const char *str,uint32_t len) +{ + sha1_ctx context; + int i; + + sha1_init(&context); + for (i = 0; i < len; i++) + sha1_update(&context,(uint8_t *)str + i,1); + + sha1_final((uint8_t *)hash,&context); + hash[20] = '\0'; +} |