/* md5.c - MD5 Message-Digest Algorithm
* Copyright (C) 1995,1996,1998,1999,2001,2002 Free Software Foundation, Inc.
*
* Modifications for IPMI are Copyright(C) 2002,2003 MontaVista Software.
* Corey Minyard <cminyard@mvista.com>
*
* This file is part of Libgcrypt.
*
* Libgcrypt is free software; you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation; either version 2.1 of
* the License, or (at your option) any later version.
*
* Libgcrypt 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 Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser 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
*
* According to the definition of MD5 in RFC 1321 from April 1992.
* NOTE: This is *not* the same file as the one from glibc.
* Written by Ulrich Drepper <drepper@gnu.ai.mit.edu>, 1995.
* heavily modified for GnuPG by Werner Koch <wk@gnupg.org>
*/
/* Test values:
* "" D4 1D 8C D9 8F 00 B2 04 E9 80 09 98 EC F8 42 7E
* "a" 0C C1 75 B9 C0 F1 B6 A8 31 C3 99 E2 69 77 26 61
* "abc 90 01 50 98 3C D2 4F B0 D6 96 3F 7D 28 E1 7F 72
* "message digest" F9 6B 69 7D 7C B7 93 8D 52 5A 2F 31 AA F1 61 D0
*/
#include <stdlib.h>
#include <stdint.h>
#include <string.h>
#include <errno.h>
#include <OpenIPMI/internal/md5.h>
typedef uint32_t u32;
typedef uint8_t byte;
#define rol(x,n) ( ((x) << (n)) | ((x) >> (32-(n))) )
typedef struct {
u32 A,B,C,D; /* chaining variables */
u32 nblocks;
byte buf[64];
int count;
} MD5_CONTEXT;
static void
md5_init( MD5_CONTEXT *ctx )
{
ctx->A = 0x67452301;
ctx->B = 0xefcdab89;
ctx->C = 0x98badcfe;
ctx->D = 0x10325476;
ctx->nblocks = 0;
ctx->count = 0;
}
static void
burn_stack (int bytes)
{
char buf[128];
memset (buf, 0, sizeof buf);
bytes -= sizeof buf;
if (bytes > 0)
burn_stack (bytes);
}
/* These are the four functions used in the four steps of the MD5 algorithm
and defined in the RFC 1321. The first function is a little bit optimized
(as found in Colin Plumbs public domain implementation). */
/* #define FF(b, c, d) ((b & c) | (~b & d)) */
#define FF(b, c, d) (d ^ (b & (c ^ d)))
#define FG(b, c, d) FF (d, b, c)
#define FH(b, c, d) (b ^ c ^ d)
#define FI(b, c, d) (c ^ (b | ~d))
/****************
* transform n*64 bytes
*/
static void
/*transform( MD5_CONTEXT *ctx, const void *buffer, size_t len )*/
transform( MD5_CONTEXT *ctx, byte *data )
{
u32 correct_words[16];
register u32 A = ctx->A;
register u32 B = ctx->B;
register u32 C = ctx->C;
register u32 D = ctx->D;
u32 *cwp = correct_words;
int i;
byte *p1;
for(i=0, p1=data; i < 16; i++, p1 += 4)
correct_words[i] = p1[0] | (p1[1] << 8) | (p1[2] << 16) | (p1[3] << 24);
#define OP(a, b, c, d, s, T) \
do \
{ \
a += FF (b, c, d) + (*cwp++) + T; \
a = rol(a, s); \
a += b; \
} \
while (0)
/* Before we start, one word about the strange constants.
They are defined in RFC 1321 as
T[i] = (int) (4294967296.0 * fabs (sin (i))), i=1..64
*/
/* Round 1. */
OP (A, B, C, D, 7, 0xd76aa478);
OP (D, A, B, C, 12, 0xe8c7b756);
OP (C, D, A, B, 17, 0x242070db);
OP (B, C, D, A, 22, 0xc1bdceee);
OP (A, B, C, D, 7, 0xf57c0faf);
OP (D, A, B, C, 12, 0x4787c62a);
OP (C, D, A, B, 17, 0xa8304613);
OP (B, C, D, A, 22, 0xfd469501);
OP (A, B, C, D, 7, 0x698098d8);
OP (D, A, B, C, 12, 0x8b44f7af);
OP (C, D, A, B, 17, 0xffff5bb1);
OP (B, C, D, A, 22, 0x895cd7be);
OP (A, B, C, D, 7, 0x6b901122);
OP (D, A, B, C, 12, 0xfd987193);
OP (C, D, A, B, 17, 0xa679438e);
OP (B, C, D, A, 22, 0x49b40821);
#undef OP
#define OP(f, a, b, c, d, k, s, T) \
do \
{ \
a += f (b, c, d) + correct_words[k] + T; \
a = rol(a, s); \
a += b; \
} \
while (0)
/* Round 2. */
OP (FG, A, B, C, D, 1, 5, 0xf61e2562);
OP (FG, D, A, B, C, 6, 9, 0xc040b340);
OP (FG, C, D, A, B, 11, 14, 0x265e5a51);
OP (FG, B, C, D, A, 0, 20, 0xe9b6c7aa);
OP (FG, A, B, C, D, 5, 5, 0xd62f105d);
OP (FG, D, A, B, C, 10, 9, 0x02441453);
OP (FG, C, D, A, B, 15, 14, 0xd8a1e681);
OP (FG, B, C, D, A, 4, 20, 0xe7d3fbc8);
OP (FG, A, B, C, D, 9, 5, 0x21e1cde6);
OP (FG, D, A, B, C, 14, 9, 0xc33707d6);
OP (FG, C, D, A, B, 3, 14, 0xf4d50d87);
OP (FG, B, C, D, A, 8, 20, 0x455a14ed);
OP (FG, A, B, C, D, 13, 5, 0xa9e3e905);
OP (FG, D, A, B, C, 2, 9, 0xfcefa3f8);
OP (FG, C, D, A, B, 7, 14, 0x676f02d9);
OP (FG, B, C, D, A, 12, 20, 0x8d2a4c8a);
/* Round 3. */
OP (FH, A, B, C, D, 5, 4, 0xfffa3942);
OP (FH, D, A, B, C, 8, 11, 0x8771f681);
OP (FH, C, D, A, B, 11, 16, 0x6d9d6122);
OP (FH, B, C, D, A, 14, 23, 0xfde5380c);
OP (FH, A, B, C, D, 1, 4, 0xa4beea44);
OP (FH, D, A, B, C, 4, 11, 0x4bdecfa9);
OP (FH, C, D, A, B, 7, 16, 0xf6bb4b60);
OP (FH, B, C, D, A, 10, 23, 0xbebfbc70);
OP (FH, A, B, C, D, 13, 4, 0x289b7ec6);
OP (FH, D, A, B, C, 0, 11, 0xeaa127fa);
OP (FH, C, D, A, B, 3, 16, 0xd4ef3085);
OP (FH, B, C, D, A, 6, 23, 0x04881d05);
OP (FH, A, B, C, D, 9, 4, 0xd9d4d039);
OP (FH, D, A, B, C, 12, 11, 0xe6db99e5);
OP (FH, C, D, A, B, 15, 16, 0x1fa27cf8);
OP (FH, B, C, D, A, 2, 23, 0xc4ac5665);
/* Round 4. */
OP (FI, A, B, C, D, 0, 6, 0xf4292244);
OP (FI, D, A, B, C, 7, 10, 0x432aff97);
OP (FI, C, D, A, B, 14, 15, 0xab9423a7);
OP (FI, B, C, D, A, 5, 21, 0xfc93a039);
OP (FI, A, B, C, D, 12, 6, 0x655b59c3);
OP (FI, D, A, B, C, 3, 10, 0x8f0ccc92);
OP (FI, C, D, A, B, 10, 15, 0xffeff47d);
OP (FI, B, C, D, A, 1, 21, 0x85845dd1);
OP (FI, A, B, C, D, 8, 6, 0x6fa87e4f);
OP (FI, D, A, B, C, 15, 10, 0xfe2ce6e0);
OP (FI, C, D, A, B, 6, 15, 0xa3014314);
OP (FI, B, C, D, A, 13, 21, 0x4e0811a1);
OP (FI, A, B, C, D, 4, 6, 0xf7537e82);
OP (FI, D, A, B, C, 11, 10, 0xbd3af235);
OP (FI, C, D, A, B, 2, 15, 0x2ad7d2bb);
OP (FI, B, C, D, A, 9, 21, 0xeb86d391);
/* Put checksum in context given as argument. */
ctx->A += A;
ctx->B += B;
ctx->C += C;
ctx->D += D;
}
/* The routine updates the message-digest context to
* account for the presence of each of the characters inBuf[0..inLen-1]
* in the message whose digest is being computed.
*/
static void
md5_write( MD5_CONTEXT *hd, byte *inbuf, size_t inlen)
{
if( hd->count == 64 ) { /* flush the buffer */
transform( hd, hd->buf );
burn_stack (80+6*sizeof(void*));
hd->count = 0;
hd->nblocks++;
}
if( !inbuf )
return;
if( hd->count ) {
for( ; inlen && hd->count < 64; inlen-- )
hd->buf[hd->count++] = *inbuf++;
md5_write( hd, NULL, 0 );
if( !inlen )
return;
}
burn_stack (80+6*sizeof(void*));
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 message-digest computation and
* ends with the desired message digest in mdContext->digest[0...15].
* The handle is prepared for a new MD5 cycle.
* Returns 16 bytes representing the digest.
*/
static void
md5_final( MD5_CONTEXT *hd )
{
u32 t, msb, lsb;
byte *p;
md5_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;
md5_write(hd, NULL, 0); /* flush */;
memset(hd->buf, 0, 56 ); /* fill next block with zeroes */
}
/* append the 64 bit count */
hd->buf[56] = lsb ;
hd->buf[57] = lsb >> 8;
hd->buf[58] = lsb >> 16;
hd->buf[59] = lsb >> 24;
hd->buf[60] = msb ;
hd->buf[61] = msb >> 8;
hd->buf[62] = msb >> 16;
hd->buf[63] = msb >> 24;
transform( hd, hd->buf );
burn_stack (80+6*sizeof(void*));
p = hd->buf;
#define X(a) do { *p++ = hd->a ; *p++ = hd->a >> 8; \
*p++ = hd->a >> 16; *p++ = hd->a >> 24; } while(0)
X(A);
X(B);
X(C);
X(D);
#undef X
}
static byte *
md5_read( MD5_CONTEXT *hd )
{
return hd->buf;
}
struct ipmi_authdata_s
{
void *info;
void *(*mem_alloc)(void *info, int size);
void (*mem_free)(void *info, void *data);
unsigned char data[20];
unsigned int datalen;
};
/* External functions for the IPMI authcode algorithms. */
int
ipmi_md5_authcode_initl(const unsigned char *password,
unsigned int password_len,
ipmi_authdata_t *handle,
void *info,
void *(*mem_alloc)(void *info, int size),
void (*mem_free)(void *info, void *data))
{
struct ipmi_authdata_s *data;
if (password_len > 20)
return EINVAL;
data = mem_alloc(info, sizeof(*data));
if (!data)
return ENOMEM;
data->info = info;
data->mem_alloc = mem_alloc;
data->mem_free = mem_free;
memcpy(data->data, password, password_len);
data->datalen = password_len;
*handle = data;
return 0;
}
int
ipmi_md5_authcode_init(unsigned char *password,
ipmi_authdata_t *handle,
void *info,
void *(*mem_alloc)(void *info, int size),
void (*mem_free)(void *info, void *data))
{
return ipmi_md5_authcode_initl(password, 16, handle, info, mem_alloc, mem_free);
}
int
ipmi_md5_authcode_gen(ipmi_authdata_t handle,
ipmi_auth_sg_t data[],
void *output)
{
MD5_CONTEXT ctx;
int i;
md5_init(&ctx);
md5_write(&ctx, handle->data, handle->datalen);
for (i=0; data[i].data != NULL; i++) {
md5_write(&ctx, data[i].data, data[i].len);
}
md5_write(&ctx, handle->data, handle->datalen);
md5_final(&ctx);
memcpy(output, md5_read(&ctx), 16);
return 0;
}
int
ipmi_md5_authcode_check(ipmi_authdata_t handle,
ipmi_auth_sg_t data[],
void *code)
{
MD5_CONTEXT ctx;
int i;
md5_init(&ctx);
md5_write(&ctx, handle->data, handle->datalen);
for (i=0; data[i].data != NULL; i++) {
md5_write(&ctx, data[i].data, data[i].len);
}
md5_write(&ctx, handle->data, handle->datalen);
md5_final(&ctx);
if (memcmp(code, md5_read(&ctx), 16) != 0)
return EINVAL;
return 0;
}
void
ipmi_md5_authcode_cleanup(ipmi_authdata_t handle)
{
memset(handle->data, 0, sizeof(handle->data));
handle->mem_free(handle->info, handle);
}
/* The stuff below is libgcrypt-specific, and does not apply to IPMI. The
stuff above is generic. Nice separation, thank you :-).
-Corey Minyard
*/
#if 0
/****************
* 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.
*/
static const char *
md5_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[18] = /* Object ID is 1.2.840.113549.2.5 */
{ 0x30, 0x20, 0x30, 0x0c, 0x06, 0x08, 0x2a, 0x86,0x48,
0x86, 0xf7, 0x0d, 0x02, 0x05, 0x05, 0x00, 0x04, 0x10 };
if( algo != 1 )
return NULL;
*contextsize = sizeof(MD5_CONTEXT);
*r_asnoid = asn;
*r_asnlen = DIM(asn);
*r_mdlen = 16;
*(void (**)(MD5_CONTEXT *))r_init = md5_init;
*(void (**)(MD5_CONTEXT *, byte*, size_t))r_write = md5_write;
*(void (**)(MD5_CONTEXT *))r_final = md5_final;
*(byte *(**)(MD5_CONTEXT *))r_read = md5_read;
return "MD5";
}
#ifndef IS_MODULE
static
#endif
const char * const gnupgext_version = "MD5 ($Revision: 1.4 $)";
static struct {
int class;
int version;
int value;
void (*func)(void);
} func_table[] = {
{ 10, 1, 0, (void(*)(void))md5_get_info },
{ 11, 1, 1 },
};
#ifndef IS_MODULE
static
#endif
void *
gnupgext_enum_func( int what, int *sequence, int *class, int *vers )
{
void *ret;
int i = *sequence;
do {
if( i >= DIM(func_table) || i < 0 )
return NULL;
*class = func_table[i].class;
*vers = func_table[i].version;
switch( *class ) {
case 11: case 21: case 31: ret = &func_table[i].value; break;
default: ret = func_table[i].func; break;
}
i++;
} while( what && what != *class );
*sequence = i;
return ret;
}
#ifndef IS_MODULE
void
_gcry_md5_constructor(void)
{
_gcry_register_internal_cipher_extension( gnupgext_version, gnupgext_enum_func );
}
#endif
#endif
/* end of file */