aboutsummaryrefslogtreecommitdiffstats
path: root/cipher/sha256.c
diff options
context:
space:
mode:
Diffstat (limited to '')
-rw-r--r--cipher/sha256.c379
1 files changed, 0 insertions, 379 deletions
diff --git a/cipher/sha256.c b/cipher/sha256.c
deleted file mode 100644
index 240307356..000000000
--- a/cipher/sha256.c
+++ /dev/null
@@ -1,379 +0,0 @@
-/* sha256.c - SHA224 and SHA256 hash functions
- * Copyright (C) 2003, 2006 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
- * USA.
- */
-
-
-/* Test vectors from FIPS-180-2:
- *
- * "abc"
- * 224:
- * 23097D22 3405D822 8642A477 BDA255B3 2AADBCE4 BDA0B3F7 E36C9DA7
- * 256:
- * BA7816BF 8F01CFEA 414140DE 5DAE2223 B00361A3 96177A9C B410FF61 F20015AD
- *
- * "abcdbcdecdefdefgefghfghighijhijkijkljklmklmnlmnomnopnopq"
- * 224:
- * 75388B16 512776CC 5DBA5DA1 FD890150 B0C6455C B4F58B19 52522525
- * 256:
- * 248D6A61 D20638B8 E5C02693 0C3E6039 A33CE459 64FF2167 F6ECEDD4 19DB06C1
- *
- * "a" x 1000000
- * 224:
- * 20794655 980C91D8 BBB4C1EA 97618A4B F03F4258 1948B2EE 4EE7AD67
- * 256:
- * 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;
-}
-
-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;
-}
-
-
-/****************
- * 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;
-
-#ifdef BIG_ENDIAN_HOST
- 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.
- * Returns: 32 bytes representing the digest. When used for sha224,
- * we take the leftmost 28 of those bytes.
- */
-
-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;
-#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);
- X(5);
- X(6);
- /* Note that this last chunk is included even for SHA224. We just
- ignore it. */
- X(7);
-#undef X
-}
-
-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";
-}
-
-/* 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";
-}
generated by cgit v1.2.3 (git 2.25.1) at 2025-04-30 17:59:16 +0000