#include "os.h"#include <libsec.h>/* * rfc1321 requires that I include this. The code is new. The constants * all come from the rfc (hence the copyright). We trade a table for the * macros in rfc. The total size is a lot less. -- presotto * * Copyright (C) 1991-2, RSA Data Security, Inc. Created 1991. All * rights reserved. * * License to copy and use this software is granted provided that it * is identified as the "RSA Data Security, Inc. MD5 Message-Digest * Algorithm" in all material mentioning or referencing this software * or this function. * * License is also granted to make and use derivative works provided * that such works are identified as "derived from the RSA Data * Security, Inc. MD5 Message-Digest Algorithm" in all material * mentioning or referencing the derived work. * * RSA Data Security, Inc. makes no representations concerning either * the merchantability of this software or the suitability of this * software forany particular purpose. It is provided "as is" * without express or implied warranty of any kind. * These notices must be retained in any copies of any part of this * documentation and/or software. */static void encode(uchar*, u32int*, ulong);extern void _md5block(uchar*, ulong, u32int*);MD5state*md5(uchar *p, ulong len, uchar *digest, MD5state *s){ u32int x[16]; uchar buf[128]; int i; uchar *e; if(s == nil){ s = malloc(sizeof(*s)); if(s == nil) return nil; memset(s, 0, sizeof(*s)); s->malloced = 1; } if(s->seeded == 0){ /* seed the state, these constants would look nicer big-endian */ s->state[0] = 0x67452301; s->state[1] = 0xefcdab89; s->state[2] = 0x98badcfe; s->state[3] = 0x10325476; s->seeded = 1; } /* fill out the partial 64 byte block from previous calls */ if(s->blen){ i = 64 - s->blen; if(len < i) i = len; memmove(s->buf + s->blen, p, i); len -= i; s->blen += i; p += i; if(s->blen == 64){ _md5block(s->buf, s->blen, s->state); s->len += s->blen; s->blen = 0; } } /* do 64 byte blocks */ i = len & ~0x3f; if(i){ _md5block(p, i, s->state); s->len += i; len -= i; p += i; } /* save the left overs if not last call */ if(digest == 0){ if(len){ memmove(s->buf, p, len); s->blen += len; } return s; } /* * this is the last time through, pad what's left with 0x80, * 0's, and the input count to create a multiple of 64 bytes */ if(s->blen){ p = s->buf; len = s->blen; } else { memmove(buf, p, len); p = buf; } s->len += len; e = p + len; if(len < 56) i = 56 - len; else i = 120 - len; memset(e, 0, i); *e = 0x80; len += i; /* append the count */ x[0] = s->len<<3; x[1] = s->len>>29; encode(p+len, x, 8); /* digest the last part */ _md5block(p, len+8, s->state); s->len += len; /* return result and free state */ encode(digest, s->state, MD5dlen); if(s->malloced == 1) free(s); return nil;}/* * encodes input (u32int) into output (uchar). Assumes len is * a multiple of 4. */static voidencode(uchar *output, u32int *input, ulong len){ u32int x; uchar *e; for(e = output + len; output < e;) { x = *input++; *output++ = x; *output++ = x >> 8; *output++ = x >> 16; *output++ = x >> 24; }}
#include "os.h"
#include <libsec.h>
/*
* rfc1321 requires that I include this. The code is new. The constants
* all come from the rfc (hence the copyright). We trade a table for the
* macros in rfc. The total size is a lot less. -- presotto
*
* Copyright (C) 1991-2, RSA Data Security, Inc. Created 1991. All
* rights reserved.
*
* License to copy and use this software is granted provided that it
* is identified as the "RSA Data Security, Inc. MD5 Message-Digest
* Algorithm" in all material mentioning or referencing this software
* or this function.
*
* License is also granted to make and use derivative works provided
* that such works are identified as "derived from the RSA Data
* Security, Inc. MD5 Message-Digest Algorithm" in all material
* mentioning or referencing the derived work.
*
* RSA Data Security, Inc. makes no representations concerning either
* the merchantability of this software or the suitability of this
* software forany particular purpose. It is provided "as is"
* without express or implied warranty of any kind.
* These notices must be retained in any copies of any part of this
* documentation and/or software.
*/
static void encode(uchar*, u32int*, ulong);
extern void _md5block(uchar*, ulong, u32int*);
MD5state*
md5(uchar *p, ulong len, uchar *digest, MD5state *s)
{
u32int x[16];
uchar buf[128];
int i;
uchar *e;
if(s == nil){
s = malloc(sizeof(*s));
if(s == nil)
return nil;
memset(s, 0, sizeof(*s));
s->malloced = 1;
}
if(s->seeded == 0){
/* seed the state, these constants would look nicer big-endian */
s->state[0] = 0x67452301;
s->state[1] = 0xefcdab89;
s->state[2] = 0x98badcfe;
s->state[3] = 0x10325476;
s->seeded = 1;
}
/* fill out the partial 64 byte block from previous calls */
if(s->blen){
i = 64 - s->blen;
if(len < i)
i = len;
memmove(s->buf + s->blen, p, i);
len -= i;
s->blen += i;
p += i;
if(s->blen == 64){
_md5block(s->buf, s->blen, s->state);
s->len += s->blen;
s->blen = 0;
}
}
/* do 64 byte blocks */
i = len & ~0x3f;
if(i){
_md5block(p, i, s->state);
s->len += i;
len -= i;
p += i;
}
/* save the left overs if not last call */
if(digest == 0){
if(len){
memmove(s->buf, p, len);
s->blen += len;
}
return s;
}
/*
* this is the last time through, pad what's left with 0x80,
* 0's, and the input count to create a multiple of 64 bytes
*/
if(s->blen){
p = s->buf;
len = s->blen;
} else {
memmove(buf, p, len);
p = buf;
}
s->len += len;
e = p + len;
if(len < 56)
i = 56 - len;
else
i = 120 - len;
memset(e, 0, i);
*e = 0x80;
len += i;
/* append the count */
x[0] = s->len<<3;
x[1] = s->len>>29;
encode(p+len, x, 8);
/* digest the last part */
_md5block(p, len+8, s->state);
s->len += len;
/* return result and free state */
encode(digest, s->state, MD5dlen);
if(s->malloced == 1)
free(s);
return nil;
}
/*
* encodes input (u32int) into output (uchar). Assumes len is
* a multiple of 4.
*/
static void
encode(uchar *output, u32int *input, ulong len)
{
u32int x;
uchar *e;
for(e = output + len; output < e;) {
x = *input++;
*output++ = x;
*output++ = x >> 8;
*output++ = x >> 16;
*output++ = x >> 24;
}
}