/*
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 SHA1HANDSOFF * Copies data before messing with it. */
#include <stdio.h>
#include <string.h>
#include <sha1.h>
#if defined(__OPTIMIZE__)
#error You must compile this program without "-O".
#endif
#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[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 SHA1Transform(guint32 state[5], guchar buffer[64])
{
guint32 a, b, c, d, e;
typedef union {
guchar c[64];
guint32 l[16];
} CHAR64LONG16;
CHAR64LONG16 *block;
#ifdef SHA1HANDSOFF
static guchar 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, guchar * data, guint32 len)
{
guint32 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(guchar digest[20], SHA1_CTX * context)
{
guint32 i, j;
guchar finalcount[8];
for (i = 0; i < 8; i++) {
finalcount[i] = (guchar) ((context->count[(i >= 4 ? 0 : 1)]
>> ((3 - (i & 3)) * 8)) & 255); /* Endian independent */
}
SHA1Update(context, (guchar *) "\200", 1);
while ((context->count[0] & 504) != 448) {
SHA1Update(context, (guchar *) "\0", 1);
}
SHA1Update(context, finalcount, 8); /* Should cause a SHA1Transform() */
for (i = 0; i < 20; i++) {
digest[i] = (guchar)
((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
}
#ifdef SHA1_TEST
static char *b32_alphabet = "ABCDEFGHIJKLMNOPQRSTUVWXYZ234567";
static void base32_encode_exactly(guchar * buf, gint len,
guchar * encbuf, gint enclen)
{
gint i = 0;
guchar *ip = buf + len;
guchar *op = encbuf + enclen;
switch (len % 5) {
case 0:
do {
g_assert(op - encbuf >= 8);
i = *--ip; /* Input #4 */
*--op = b32_alphabet[i & 0x1f]; /* Ouput #7 */
i >>= 5; /* upper <234>, input #4 */
/* FALLTHROUGH */
case 4:
i |= ((guint32) * --ip) << 3; /* had 3 bits in `i' */
*--op = b32_alphabet[i & 0x1f]; /* Output #6 */
i >>= 5; /* upper <401234>, input #3 */
*--op = b32_alphabet[i & 0x1f]; /* Output #5 */
i >>= 5; /* upper <4>, input #3 */
/* FALLTHROUGH */
case 3:
i |= ((guint32) * --ip) << 1; /* had 1 bits in `i' */
*--op = b32_alphabet[i & 0x1f]; /* Output #4 */
i >>= 5; /* upper <1234>, input #2 */
/* FALLTHROUGH */
case 2:
i |= ((guint32) * --ip) << 4; /* had 4 bits in `i' */
*--op = b32_alphabet[i & 0x1f]; /* Output #3 */
i >>= 5; /* upper <3401234>, input #1 */
*--op = b32_alphabet[i & 0x1f]; /* Output #2 */
i >>= 5; /* upper <34>, input #1 */
/* FALLTHROUGH */
case 1:
i |= ((guint32) * --ip) << 2; /* had 2 bits in `i' */
*--op = b32_alphabet[i & 0x1f]; /* Output #1 */
i >>= 5; /* upper <01234>, input #0 */
*--op = b32_alphabet[i & 0x1f]; /* Output #0 */
i >>= 5; /* Holds nothing, MBZ */
g_assert(i == 0);
g_assert(op >= encbuf);
} while (op > encbuf);
}
}
/*************************************************************/
int main(int argc, char **argv)
{
gint i, j;
SHA1_CTX context;
guchar digest[20], buffer[16384];
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[1], "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[i*4+j]);
}
putchar(' ');
}
putchar('\n');
{
guchar tmp[33];
tmp[32] = '\0';
base32_encode_exactly(digest, 20, tmp, 32);
printf("%s\n", tmp);
}
exit(0);
}
#endif /* SHA1_TEST */