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+/* 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 2024-11-22 06:47:01 +0000