2006-04-20 02:05:32 +00:00
|
|
|
/* sha256.c - SHA224 and SHA256 hash functions
|
|
|
|
* Copyright (C) 2003, 2006 Free Software Foundation, Inc.
|
2003-02-04 19:28:40 +00:00
|
|
|
*
|
|
|
|
* 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
|
2005-05-31 08:39:18 +00:00
|
|
|
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
|
|
|
|
* USA.
|
2003-02-04 19:28:40 +00:00
|
|
|
*/
|
|
|
|
|
|
|
|
|
|
|
|
/* Test vectors from FIPS-180-2:
|
|
|
|
*
|
|
|
|
* "abc"
|
2006-04-20 02:05:32 +00:00
|
|
|
* 224:
|
|
|
|
* 23097D22 3405D822 8642A477 BDA255B3 2AADBCE4 BDA0B3F7 E36C9DA7
|
|
|
|
* 256:
|
2003-02-04 19:28:40 +00:00
|
|
|
* BA7816BF 8F01CFEA 414140DE 5DAE2223 B00361A3 96177A9C B410FF61 F20015AD
|
|
|
|
*
|
|
|
|
* "abcdbcdecdefdefgefghfghighijhijkijkljklmklmnlmnomnopnopq"
|
2006-04-20 02:05:32 +00:00
|
|
|
* 224:
|
|
|
|
* 75388B16 512776CC 5DBA5DA1 FD890150 B0C6455C B4F58B19 52522525
|
|
|
|
* 256:
|
2003-02-04 19:28:40 +00:00
|
|
|
* 248D6A61 D20638B8 E5C02693 0C3E6039 A33CE459 64FF2167 F6ECEDD4 19DB06C1
|
|
|
|
*
|
|
|
|
* "a" x 1000000
|
2006-04-20 02:05:32 +00:00
|
|
|
* 224:
|
|
|
|
* 20794655 980C91D8 BBB4C1EA 97618A4B F03F4258 1948B2EE 4EE7AD67
|
|
|
|
* 256:
|
2003-02-04 19:28:40 +00:00
|
|
|
* CDC76E5C 9914FB92 81A1C7E2 84D73E67 F1809A48 A497200E 046D39CC C7112CD0
|
|
|
|
*/
|
|
|
|
|
|
|
|
|
|
|
|
#include <config.h>
|
|
|
|
#include <string.h>
|
|
|
|
#include "util.h"
|
|
|
|
#include "algorithms.h"
|
|
|
|
|
|
|
|
|
|
|
|
typedef struct {
|
|
|
|
u32 h0,h1,h2,h3,h4,h5,h6,h7;
|
|
|
|
u32 nblocks;
|
|
|
|
byte buf[64];
|
|
|
|
int count;
|
|
|
|
} SHA256_CONTEXT;
|
|
|
|
|
|
|
|
static void
|
|
|
|
burn_stack (int bytes)
|
|
|
|
{
|
|
|
|
char buf[128];
|
|
|
|
|
|
|
|
wipememory(buf,sizeof buf);
|
|
|
|
bytes -= sizeof buf;
|
|
|
|
if (bytes > 0)
|
|
|
|
burn_stack (bytes);
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
void
|
|
|
|
sha256_init( SHA256_CONTEXT *hd )
|
|
|
|
{
|
|
|
|
hd->h0 = 0x6a09e667;
|
|
|
|
hd->h1 = 0xbb67ae85;
|
|
|
|
hd->h2 = 0x3c6ef372;
|
|
|
|
hd->h3 = 0xa54ff53a;
|
|
|
|
hd->h4 = 0x510e527f;
|
|
|
|
hd->h5 = 0x9b05688c;
|
|
|
|
hd->h6 = 0x1f83d9ab;
|
|
|
|
hd->h7 = 0x5be0cd19;
|
|
|
|
|
|
|
|
hd->nblocks = 0;
|
|
|
|
hd->count = 0;
|
|
|
|
}
|
|
|
|
|
2006-04-20 02:05:32 +00:00
|
|
|
void
|
|
|
|
sha224_init( SHA256_CONTEXT *hd )
|
|
|
|
{
|
|
|
|
hd->h0 = 0xc1059ed8;
|
|
|
|
hd->h1 = 0x367cd507;
|
|
|
|
hd->h2 = 0x3070dd17;
|
|
|
|
hd->h3 = 0xf70e5939;
|
|
|
|
hd->h4 = 0xffc00b31;
|
|
|
|
hd->h5 = 0x68581511;
|
|
|
|
hd->h6 = 0x64f98fa7;
|
|
|
|
hd->h7 = 0xbefa4fa4;
|
|
|
|
|
|
|
|
hd->nblocks = 0;
|
|
|
|
hd->count = 0;
|
|
|
|
}
|
|
|
|
|
2003-02-04 19:28:40 +00:00
|
|
|
|
|
|
|
/****************
|
|
|
|
* Transform the message w which consists of 16 32-bit words
|
|
|
|
*/
|
|
|
|
static void
|
|
|
|
transform( SHA256_CONTEXT *hd, byte *data )
|
|
|
|
{
|
|
|
|
u32 a,b,c,d,e,f,g,h;
|
|
|
|
u32 w[64];
|
|
|
|
int t;
|
|
|
|
static const u32 k[]=
|
|
|
|
{
|
|
|
|
0x428a2f98, 0x71374491, 0xb5c0fbcf, 0xe9b5dba5, 0x3956c25b, 0x59f111f1,
|
|
|
|
0x923f82a4, 0xab1c5ed5, 0xd807aa98, 0x12835b01, 0x243185be, 0x550c7dc3,
|
|
|
|
0x72be5d74, 0x80deb1fe, 0x9bdc06a7, 0xc19bf174, 0xe49b69c1, 0xefbe4786,
|
|
|
|
0x0fc19dc6, 0x240ca1cc, 0x2de92c6f, 0x4a7484aa, 0x5cb0a9dc, 0x76f988da,
|
|
|
|
0x983e5152, 0xa831c66d, 0xb00327c8, 0xbf597fc7, 0xc6e00bf3, 0xd5a79147,
|
|
|
|
0x06ca6351, 0x14292967, 0x27b70a85, 0x2e1b2138, 0x4d2c6dfc, 0x53380d13,
|
|
|
|
0x650a7354, 0x766a0abb, 0x81c2c92e, 0x92722c85, 0xa2bfe8a1, 0xa81a664b,
|
|
|
|
0xc24b8b70, 0xc76c51a3, 0xd192e819, 0xd6990624, 0xf40e3585, 0x106aa070,
|
|
|
|
0x19a4c116, 0x1e376c08, 0x2748774c, 0x34b0bcb5, 0x391c0cb3, 0x4ed8aa4a,
|
|
|
|
0x5b9cca4f, 0x682e6ff3, 0x748f82ee, 0x78a5636f, 0x84c87814, 0x8cc70208,
|
|
|
|
0x90befffa, 0xa4506ceb, 0xbef9a3f7, 0xc67178f2
|
|
|
|
};
|
|
|
|
|
|
|
|
/* get values from the chaining vars */
|
|
|
|
a = hd->h0;
|
|
|
|
b = hd->h1;
|
|
|
|
c = hd->h2;
|
|
|
|
d = hd->h3;
|
|
|
|
e = hd->h4;
|
|
|
|
f = hd->h5;
|
|
|
|
g = hd->h6;
|
|
|
|
h = hd->h7;
|
|
|
|
|
2006-03-20 16:40:28 +00:00
|
|
|
#ifdef BIG_ENDIAN_HOST
|
2003-02-04 19:28:40 +00:00
|
|
|
memcpy( w, data, 64 );
|
|
|
|
#else
|
|
|
|
{
|
|
|
|
int i;
|
|
|
|
byte *p2;
|
|
|
|
|
|
|
|
for(i=0, p2=(byte*)w; i < 16; i++, p2 += 4 )
|
|
|
|
{
|
|
|
|
p2[3] = *data++;
|
|
|
|
p2[2] = *data++;
|
|
|
|
p2[1] = *data++;
|
|
|
|
p2[0] = *data++;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
#endif
|
|
|
|
|
|
|
|
#define ROTR(x,n) (((x)>>(n)) | ((x)<<(32-(n))))
|
|
|
|
#define Ch(x,y,z) (((x) & (y)) ^ ((~(x)) & (z)))
|
|
|
|
#define Maj(x,y,z) (((x) & (y)) ^ ((x) & (z)) ^ ((y) & (z)))
|
|
|
|
#define Sum0(x) (ROTR((x),2) ^ ROTR((x),13) ^ ROTR((x),22))
|
|
|
|
#define Sum1(x) (ROTR((x),6) ^ ROTR((x),11) ^ ROTR((x),25))
|
|
|
|
#define S0(x) (ROTR((x),7) ^ ROTR((x),18) ^ ((x)>>3))
|
|
|
|
#define S1(x) (ROTR((x),17) ^ ROTR((x),19) ^ ((x)>>10))
|
|
|
|
|
|
|
|
for(t=16;t<64;t++)
|
|
|
|
w[t] = S1(w[t-2]) + w[t-7] + S0(w[t-15]) + w[t-16];
|
|
|
|
|
|
|
|
for(t=0;t<64;t++)
|
|
|
|
{
|
|
|
|
u32 t1,t2;
|
|
|
|
|
|
|
|
t1=h+Sum1(e)+Ch(e,f,g)+k[t]+w[t];
|
|
|
|
t2=Sum0(a)+Maj(a,b,c);
|
|
|
|
h=g;
|
|
|
|
g=f;
|
|
|
|
f=e;
|
|
|
|
e=d+t1;
|
|
|
|
d=c;
|
|
|
|
c=b;
|
|
|
|
b=a;
|
|
|
|
a=t1+t2;
|
|
|
|
/* printf("t=%d a=%08lX b=%08lX c=%08lX d=%08lX e=%08lX f=%08lX g=%08lX h=%08lX\n",t,a,b,c,d,e,f,g,h); */
|
|
|
|
}
|
|
|
|
|
|
|
|
/* update chaining vars */
|
|
|
|
hd->h0 += a;
|
|
|
|
hd->h1 += b;
|
|
|
|
hd->h2 += c;
|
|
|
|
hd->h3 += d;
|
|
|
|
hd->h4 += e;
|
|
|
|
hd->h5 += f;
|
|
|
|
hd->h6 += g;
|
|
|
|
hd->h7 += h;
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
/* Update the message digest with the contents
|
|
|
|
* of INBUF with length INLEN.
|
|
|
|
*/
|
|
|
|
static void
|
|
|
|
sha256_write( SHA256_CONTEXT *hd, byte *inbuf, size_t inlen)
|
|
|
|
{
|
|
|
|
if( hd->count == 64 ) { /* flush the buffer */
|
|
|
|
transform( hd, hd->buf );
|
|
|
|
burn_stack (328);
|
|
|
|
hd->count = 0;
|
|
|
|
hd->nblocks++;
|
|
|
|
}
|
|
|
|
if( !inbuf )
|
|
|
|
return;
|
|
|
|
if( hd->count ) {
|
|
|
|
for( ; inlen && hd->count < 64; inlen-- )
|
|
|
|
hd->buf[hd->count++] = *inbuf++;
|
|
|
|
sha256_write( hd, NULL, 0 );
|
|
|
|
if( !inlen )
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
|
|
|
|
while( inlen >= 64 ) {
|
|
|
|
transform( hd, inbuf );
|
|
|
|
hd->count = 0;
|
|
|
|
hd->nblocks++;
|
|
|
|
inlen -= 64;
|
|
|
|
inbuf += 64;
|
|
|
|
}
|
|
|
|
burn_stack (328);
|
|
|
|
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.
|
2006-04-20 02:05:32 +00:00
|
|
|
* Returns: 32 bytes representing the digest. When used for sha224,
|
|
|
|
* we take the leftmost 28 of those bytes.
|
2003-02-04 19:28:40 +00:00
|
|
|
*/
|
|
|
|
|
|
|
|
static void
|
|
|
|
sha256_final(SHA256_CONTEXT *hd)
|
|
|
|
{
|
|
|
|
u32 t, msb, lsb;
|
|
|
|
byte *p;
|
|
|
|
|
|
|
|
sha256_write(hd, NULL, 0); /* flush */;
|
|
|
|
|
|
|
|
t = hd->nblocks;
|
|
|
|
/* multiply by 64 to make a byte count */
|
|
|
|
lsb = t << 6;
|
|
|
|
msb = t >> 26;
|
|
|
|
/* add the count */
|
|
|
|
t = lsb;
|
|
|
|
if( (lsb += hd->count) < t )
|
|
|
|
msb++;
|
|
|
|
/* multiply by 8 to make a bit count */
|
|
|
|
t = lsb;
|
|
|
|
lsb <<= 3;
|
|
|
|
msb <<= 3;
|
|
|
|
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;
|
|
|
|
sha256_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 );
|
|
|
|
burn_stack (328);
|
|
|
|
|
|
|
|
p = hd->buf;
|
2006-03-20 16:40:28 +00:00
|
|
|
#ifdef BIG_ENDIAN_HOST
|
* bithelp.h, des.c, random.c, rndlinux.c, sha1.c, blowfish.c, elgamal.c,
rijndael.c, rndunix.c, sha256.c, cast5.c, idea-stub.c, rmd160.c, rndw32.c,
sha512.c, md5.c, rmd160test.c, rsa.c, tiger.c: Edit all preprocessor
instructions to remove whitespace before the '#'. This is not required by
C89, but there are some compilers out there that don't like it.
2003-05-24 18:31:33 +00:00
|
|
|
#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; \
|
2003-02-04 19:28:40 +00:00
|
|
|
*p++ = hd->h##a >> 8; *p++ = hd->h##a; } while(0)
|
* bithelp.h, des.c, random.c, rndlinux.c, sha1.c, blowfish.c, elgamal.c,
rijndael.c, rndunix.c, sha256.c, cast5.c, idea-stub.c, rmd160.c, rndw32.c,
sha512.c, md5.c, rmd160test.c, rsa.c, tiger.c: Edit all preprocessor
instructions to remove whitespace before the '#'. This is not required by
C89, but there are some compilers out there that don't like it.
2003-05-24 18:31:33 +00:00
|
|
|
#endif
|
2003-02-04 19:28:40 +00:00
|
|
|
X(0);
|
|
|
|
X(1);
|
|
|
|
X(2);
|
|
|
|
X(3);
|
|
|
|
X(4);
|
|
|
|
X(5);
|
|
|
|
X(6);
|
2006-04-20 02:05:32 +00:00
|
|
|
/* Note that this last chunk is included even for SHA224. We just
|
|
|
|
ignore it. */
|
2003-02-04 19:28:40 +00:00
|
|
|
X(7);
|
* bithelp.h, des.c, random.c, rndlinux.c, sha1.c, blowfish.c, elgamal.c,
rijndael.c, rndunix.c, sha256.c, cast5.c, idea-stub.c, rmd160.c, rndw32.c,
sha512.c, md5.c, rmd160test.c, rsa.c, tiger.c: Edit all preprocessor
instructions to remove whitespace before the '#'. This is not required by
C89, but there are some compilers out there that don't like it.
2003-05-24 18:31:33 +00:00
|
|
|
#undef X
|
2003-02-04 19:28:40 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
static byte *
|
|
|
|
sha256_read( SHA256_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 *
|
|
|
|
sha256_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[] = /* Object ID is 2.16.840.1.101.3.4.2.1 */
|
|
|
|
{
|
|
|
|
0x30, 0x31, 0x30, 0x0d, 0x06, 0x09, 0x60, 0x86,
|
|
|
|
0x48, 0x01, 0x65, 0x03, 0x04, 0x02, 0x01, 0x05,
|
|
|
|
0x00, 0x04, 0x20
|
|
|
|
};
|
|
|
|
|
|
|
|
if( algo != 8 )
|
|
|
|
return NULL;
|
|
|
|
|
|
|
|
*contextsize = sizeof(SHA256_CONTEXT);
|
|
|
|
*r_asnoid = asn;
|
|
|
|
*r_asnlen = DIM(asn);
|
|
|
|
*r_mdlen = 32;
|
|
|
|
*(void (**)(SHA256_CONTEXT *))r_init = sha256_init;
|
|
|
|
*(void (**)(SHA256_CONTEXT *, byte*, size_t))r_write = sha256_write;
|
|
|
|
*(void (**)(SHA256_CONTEXT *))r_final = sha256_final;
|
|
|
|
*(byte *(**)(SHA256_CONTEXT *))r_read = sha256_read;
|
|
|
|
|
|
|
|
return "SHA256";
|
|
|
|
}
|
2006-04-20 02:05:32 +00:00
|
|
|
|
|
|
|
/* SHA224 is really a truncated SHA256 with a different
|
|
|
|
initialization */
|
|
|
|
const char *
|
|
|
|
sha224_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[] = /* Object ID is 2.16.840.1.101.3.4.2.4 */
|
|
|
|
{
|
|
|
|
0x30, 0x31, 0x30, 0x0d, 0x06, 0x09, 0x60, 0x86,
|
|
|
|
0x48, 0x01, 0x65, 0x03, 0x04, 0x02, 0x04, 0x05,
|
|
|
|
0x00, 0x04, 0x20
|
|
|
|
};
|
|
|
|
|
|
|
|
if( algo != 11 )
|
|
|
|
return NULL;
|
|
|
|
|
|
|
|
*contextsize = sizeof(SHA256_CONTEXT);
|
|
|
|
*r_asnoid = asn;
|
|
|
|
*r_asnlen = DIM(asn);
|
|
|
|
*r_mdlen = 28;
|
|
|
|
*(void (**)(SHA256_CONTEXT *))r_init = sha224_init;
|
|
|
|
*(void (**)(SHA256_CONTEXT *, byte*, size_t))r_write = sha256_write;
|
|
|
|
*(void (**)(SHA256_CONTEXT *))r_final = sha256_final;
|
|
|
|
*(byte *(**)(SHA256_CONTEXT *))r_read = sha256_read;
|
|
|
|
|
|
|
|
return "SHA224";
|
|
|
|
}
|