/* sha1.c - SHA1 hash function * Copyright (C) 1998 Free Software Foundation, Inc. * * Please see below for more legal information! * * This file is part of GNUPG. * * GNUPG is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * GNUPG is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA */ /* Test vectors: * * "abc" * A999 3E36 4706 816A BA3E 2571 7850 C26C 9CD0 D89D * * "abcdbcdecdefdefgefghfghighijhijkijkljklmklmnlmnomnopnopq" * 8498 3E44 1C3B D26E BAAE 4AA1 F951 29E5 E546 70F1 */ #include #include #include #include #include #include "util.h" #include "memory.h" #include "sha1.h" typedef struct { u32 h0,h1,h2,h3,h4; u32 nblocks; byte buf[64]; int count; } SHA1_CONTEXT; #if defined(__GNUC__) && defined(__i386__) static inline u32 rol(int n, u32 x) { __asm__("roll %%cl,%0" :"=r" (x) :"0" (x),"c" (n)); return x; } #else #define rol(n,x) ( ((x) << (n)) | ((x) >> (32-(n))) ) #endif void sha1_init( SHA1_CONTEXT *hd ) { hd->h0 = 0x67452301; hd->h1 = 0xefcdab89; hd->h2 = 0x98badcfe; hd->h3 = 0x10325476; hd->h4 = 0xc3d2e1f0; hd->nblocks = 0; hd->count = 0; } /**************** * Transform the message X which consists of 16 32-bit-words */ static void transform( SHA1_CONTEXT *hd, byte *data ) { u32 a,b,c,d,e,tm; u32 x[16]; /* get values from the chaining vars */ a = hd->h0; b = hd->h1; c = hd->h2; d = hd->h3; e = hd->h4; #ifdef BIG_ENDIAN_HOST memcpy( x, data, 64 ); #else { int i; byte *p2; for(i=0, p2=(byte*)x; i < 16; i++, p2 += 4 ) { p2[3] = *data++; p2[2] = *data++; p2[1] = *data++; p2[0] = *data++; } } #endif #define K1 0x5A827999L #define K2 0x6ED9EBA1L #define K3 0x8F1BBCDCL #define K4 0xCA62C1D6L #define F1(x,y,z) ( z ^ ( x & ( y ^ z ) ) ) #define F2(x,y,z) ( x ^ y ^ z ) #define F3(x,y,z) ( ( x & y ) | ( z & ( x | y ) ) ) #define F4(x,y,z) ( x ^ y ^ z ) #define M(i) ( tm = x[i&0x0f] ^ x[(i-14)&0x0f] \ ^ x[(i-8)&0x0f] ^ x[(i-3)&0x0f] \ , (x[i&0x0f] = (tm << 1) | (tm >> 31)) ) #define R(a,b,c,d,e,f,k,m) do { e += rol( 5, a ) \ + f( b, c, d ) \ + k \ + m; \ b = rol( 30, b ); \ } while(0) R( a, b, c, d, e, F1, K1, x[ 0] ); R( e, a, b, c, d, F1, K1, x[ 1] ); R( d, e, a, b, c, F1, K1, x[ 2] ); R( c, d, e, a, b, F1, K1, x[ 3] ); R( b, c, d, e, a, F1, K1, x[ 4] ); R( a, b, c, d, e, F1, K1, x[ 5] ); R( e, a, b, c, d, F1, K1, x[ 6] ); R( d, e, a, b, c, F1, K1, x[ 7] ); R( c, d, e, a, b, F1, K1, x[ 8] ); R( b, c, d, e, a, F1, K1, x[ 9] ); R( a, b, c, d, e, F1, K1, x[10] ); R( e, a, b, c, d, F1, K1, x[11] ); R( d, e, a, b, c, F1, K1, x[12] ); R( c, d, e, a, b, F1, K1, x[13] ); R( b, c, d, e, a, F1, K1, x[14] ); R( a, b, c, d, e, F1, K1, x[15] ); R( e, a, b, c, d, F1, K1, M(16) ); R( d, e, a, b, c, F1, K1, M(17) ); R( c, d, e, a, b, F1, K1, M(18) ); R( b, c, d, e, a, F1, K1, M(19) ); R( a, b, c, d, e, F2, K2, M(20) ); R( e, a, b, c, d, F2, K2, M(21) ); R( d, e, a, b, c, F2, K2, M(22) ); R( c, d, e, a, b, F2, K2, M(23) ); R( b, c, d, e, a, F2, K2, M(24) ); R( a, b, c, d, e, F2, K2, M(25) ); R( e, a, b, c, d, F2, K2, M(26) ); R( d, e, a, b, c, F2, K2, M(27) ); R( c, d, e, a, b, F2, K2, M(28) ); R( b, c, d, e, a, F2, K2, M(29) ); R( a, b, c, d, e, F2, K2, M(30) ); R( e, a, b, c, d, F2, K2, M(31) ); R( d, e, a, b, c, F2, K2, M(32) ); R( c, d, e, a, b, F2, K2, M(33) ); R( b, c, d, e, a, F2, K2, M(34) ); R( a, b, c, d, e, F2, K2, M(35) ); R( e, a, b, c, d, F2, K2, M(36) ); R( d, e, a, b, c, F2, K2, M(37) ); R( c, d, e, a, b, F2, K2, M(38) ); R( b, c, d, e, a, F2, K2, M(39) ); R( a, b, c, d, e, F3, K3, M(40) ); R( e, a, b, c, d, F3, K3, M(41) ); R( d, e, a, b, c, F3, K3, M(42) ); R( c, d, e, a, b, F3, K3, M(43) ); R( b, c, d, e, a, F3, K3, M(44) ); R( a, b, c, d, e, F3, K3, M(45) ); R( e, a, b, c, d, F3, K3, M(46) ); R( d, e, a, b, c, F3, K3, M(47) ); R( c, d, e, a, b, F3, K3, M(48) ); R( b, c, d, e, a, F3, K3, M(49) ); R( a, b, c, d, e, F3, K3, M(50) ); R( e, a, b, c, d, F3, K3, M(51) ); R( d, e, a, b, c, F3, K3, M(52) ); R( c, d, e, a, b, F3, K3, M(53) ); R( b, c, d, e, a, F3, K3, M(54) ); R( a, b, c, d, e, F3, K3, M(55) ); R( e, a, b, c, d, F3, K3, M(56) ); R( d, e, a, b, c, F3, K3, M(57) ); R( c, d, e, a, b, F3, K3, M(58) ); R( b, c, d, e, a, F3, K3, M(59) ); R( a, b, c, d, e, F4, K4, M(60) ); R( e, a, b, c, d, F4, K4, M(61) ); R( d, e, a, b, c, F4, K4, M(62) ); R( c, d, e, a, b, F4, K4, M(63) ); R( b, c, d, e, a, F4, K4, M(64) ); R( a, b, c, d, e, F4, K4, M(65) ); R( e, a, b, c, d, F4, K4, M(66) ); R( d, e, a, b, c, F4, K4, M(67) ); R( c, d, e, a, b, F4, K4, M(68) ); R( b, c, d, e, a, F4, K4, M(69) ); R( a, b, c, d, e, F4, K4, M(70) ); R( e, a, b, c, d, F4, K4, M(71) ); R( d, e, a, b, c, F4, K4, M(72) ); R( c, d, e, a, b, F4, K4, M(73) ); R( b, c, d, e, a, F4, K4, M(74) ); R( a, b, c, d, e, F4, K4, M(75) ); R( e, a, b, c, d, F4, K4, M(76) ); R( d, e, a, b, c, F4, K4, M(77) ); R( c, d, e, a, b, F4, K4, M(78) ); R( b, c, d, e, a, F4, K4, M(79) ); /* update chainig vars */ hd->h0 += a; hd->h1 += b; hd->h2 += c; hd->h3 += d; hd->h4 += e; } /* Update the message digest with the contents * of INBUF with length INLEN. */ static void sha1_write( SHA1_CONTEXT *hd, byte *inbuf, size_t inlen) { if( hd->count == 64 ) { /* flush the buffer */ transform( hd, hd->buf ); hd->count = 0; hd->nblocks++; } if( !inbuf ) return; if( hd->count ) { for( ; inlen && hd->count < 64; inlen-- ) hd->buf[hd->count++] = *inbuf++; sha1_write( hd, NULL, 0 ); if( !inlen ) return; } while( inlen >= 64 ) { transform( hd, inbuf ); hd->count = 0; hd->nblocks++; inlen -= 64; inbuf += 64; } for( ; inlen && hd->count < 64; inlen-- ) hd->buf[hd->count++] = *inbuf++; } /* The routine final terminates the computation and * returns the digest. * The handle is prepared for a new cycle, but adding bytes to the * handle will the destroy the returned buffer. * Returns: 20 bytes representing the digest. */ static void sha1_final(SHA1_CONTEXT *hd) { u32 t, msb, lsb; byte *p; sha1_write(hd, NULL, 0); /* flush */; msb = 0; t = hd->nblocks; if( (lsb = t << 6) < t ) /* multiply by 64 to make a byte count */ msb++; msb += t >> 26; t = lsb; if( (lsb = t + hd->count) < t ) /* add the count */ msb++; t = lsb; if( (lsb = t << 3) < t ) /* multiply by 8 to make a bit count */ msb++; msb += t >> 29; if( hd->count < 56 ) { /* enough room */ hd->buf[hd->count++] = 0x80; /* pad */ while( hd->count < 56 ) hd->buf[hd->count++] = 0; /* pad */ } else { /* need one extra block */ hd->buf[hd->count++] = 0x80; /* pad character */ while( hd->count < 64 ) hd->buf[hd->count++] = 0; sha1_write(hd, NULL, 0); /* flush */; memset(hd->buf, 0, 56 ); /* fill next block with zeroes */ } /* append the 64 bit count */ hd->buf[56] = msb >> 24; hd->buf[57] = msb >> 16; hd->buf[58] = msb >> 8; hd->buf[59] = msb ; hd->buf[60] = lsb >> 24; hd->buf[61] = lsb >> 16; hd->buf[62] = lsb >> 8; hd->buf[63] = lsb ; transform( hd, hd->buf ); p = hd->buf; #ifdef BIG_ENDIAN_HOST #define X(a) do { *(u32*)p = hd->h##a ; p += 4; } while(0) #else /* little endian */ #define X(a) do { *p++ = hd->h##a >> 24; *p++ = hd->h##a >> 16; \ *p++ = hd->h##a >> 8; *p++ = hd->h##a; } while(0) #endif X(0); X(1); X(2); X(3); X(4); #undef X } static byte * sha1_read( SHA1_CONTEXT *hd ) { return hd->buf; } /**************** * Return some information about the algorithm. We need algo here to * distinguish different flavors of the algorithm. * Returns: A pointer to string describing the algorithm or NULL if * the ALGO is invalid. */ const char * sha1_get_info( int algo, size_t *contextsize, byte **r_asnoid, int *r_asnlen, int *r_mdlen, void (**r_init)( void *c ), void (**r_write)( void *c, byte *buf, size_t nbytes ), void (**r_final)( void *c ), byte *(**r_read)( void *c ) ) { static byte asn[15] = /* Object ID is 1.3.14.3.2.26 */ { 0x30, 0x21, 0x30, 0x09, 0x06, 0x05, 0x2b, 0x0e, 0x03, 0x02, 0x1a, 0x05, 0x00, 0x04, 0x14 }; if( algo != 2 ) return NULL; *contextsize = sizeof(SHA1_CONTEXT); *r_asnoid = asn; *r_asnlen = DIM(asn); *r_mdlen = 20; *r_init = (void (*)(void *))sha1_init; *r_write = (void (*)(void *, byte*, size_t))sha1_write; *r_final = (void (*)(void *))sha1_final; *r_read = (byte *(*)(void *))sha1_read; return "SHA1"; }