* edited for clarity and style only.
*
* ----------------------------------------------------------------------------
- * The md5_crypt() function was taken from freeBSD's libcrypt and contains
- * this license:
+ * The md5_crypt() function was taken from freeBSD's libcrypt and contains
+ * this license:
* "THE BEER-WARE LICENSE" (Revision 42):
* <phk@login.dknet.dk> wrote this file. As long as you retain this notice you
* can do whatever you want with this stuff. If we meet some day, and you think
* $FreeBSD: src/lib/libcrypt/crypt.c,v 1.7.2.1 1999/08/29 14:56:33 peter Exp $
*
* ----------------------------------------------------------------------------
- * On April 19th, 2001 md5_crypt() was modified to make it reentrant
+ * On April 19th, 2001 md5_crypt() was modified to make it reentrant
* by Erik Andersen <andersen@uclibc.org>
*
*
#include <stdio.h>
#include <crypt.h>
#include <sys/cdefs.h>
-
+#include "libcrypt.h"
+
/* MD5 context. */
struct MD5Context {
u_int32_t state[4]; /* state (ABCD) */
static void __md5_Transform __P((u_int32_t [4], const unsigned char [64]));
-static const char __md5__magic[] = "$1$"; /* This string is magic for this algorithm. Having
- it this way, we can get better later on */
+#define MD5_MAGIC_STR "$1$"
+#define MD5_MAGIC_LEN (sizeof(MD5_MAGIC_STR) - 1)
+static const unsigned char __md5__magic[] = MD5_MAGIC_STR;
static const unsigned char __md5_itoa64[] = /* 0 ... 63 => ascii - 64 */
"./0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz";
-
#ifdef i386
#define __md5_Encode memcpy
#define __md5_Decode memcpy
context->state[3] = 0x10325476;
}
-/*
+/*
* MD5 block update operation. Continues an MD5 message-digest
* operation, processing another message block, and updating the
* context.
static void __md5_Update ( struct MD5Context *context, const unsigned char *input, unsigned int inputLen)
{
- unsigned int i, index, partLen;
+ unsigned int i, idx, partLen;
/* Compute number of bytes mod 64 */
- index = (unsigned int)((context->count[0] >> 3) & 0x3F);
+ idx = (unsigned int)((context->count[0] >> 3) & 0x3F);
/* Update number of bits */
if ((context->count[0] += ((u_int32_t)inputLen << 3))
context->count[1]++;
context->count[1] += ((u_int32_t)inputLen >> 29);
- partLen = 64 - index;
+ partLen = 64 - idx;
/* Transform as many times as possible. */
if (inputLen >= partLen) {
- memcpy((void *)&context->buffer[index], (const void *)input,
+ memcpy((void *)&context->buffer[idx], (const void *)input,
partLen);
__md5_Transform (context->state, context->buffer);
for (i = partLen; i + 63 < inputLen; i += 64)
__md5_Transform (context->state, &input[i]);
- index = 0;
+ idx = 0;
}
else
i = 0;
/* Buffer remaining input */
- memcpy ((void *)&context->buffer[index], (const void *)&input[i],
+ memcpy ((void *)&context->buffer[idx], (const void *)&input[i],
inputLen-i);
}
static void __md5_Pad ( struct MD5Context *context)
{
unsigned char bits[8];
- unsigned int index, padLen;
+ unsigned int idx, padLen;
unsigned char PADDING[64];
memset(PADDING, 0, sizeof(PADDING));
__md5_Encode (bits, context->count, 8);
/* Pad out to 56 mod 64. */
- index = (unsigned int)((context->count[0] >> 3) & 0x3f);
- padLen = (index < 56) ? (56 - index) : (120 - index);
+ idx = (unsigned int)((context->count[0] >> 3) & 0x3f);
+ padLen = (idx < 56) ? (56 - idx) : (120 - idx);
__md5_Update (context, PADDING, padLen);
/* Append length (before padding) */
/* MD5 basic transformation. Transforms state based on block. */
-static void
-__md5_Transform (state, block)
- u_int32_t state[4];
- const unsigned char block[64];
+static void __md5_Transform (u_int32_t state[4], const unsigned char block[64])
{
u_int32_t a, b, c, d, x[16];
-
#if MD5_SIZE_OVER_SPEED > 1
u_int32_t temp;
const char *ps;
__md5_Decode (x, block, 64);
- a = state[0]; b = state[1]; c = state[2]; d = state[3];
+ a = state[0]; b = state[1]; c = state[2]; d = state[3];
#if MD5_SIZE_OVER_SPEED > 2
pc = C; pp = P; ps = S - 4;
* Use MD5 for what it is best at...
*/
-char * __md5_crypt( const char *pw, const char *salt) attribute_hidden;
-char * __md5_crypt( const char *pw, const char *salt)
+char *__md5_crypt(const unsigned char *pw, const unsigned char *salt)
{
/* Static stuff */
- static const char *sp, *ep;
- static char passwd[120], *p;
+ /* "$1$" + salt_up_to_8_chars + "$" + 22_bytes_of_hash + NUL */
+ static char passwd[3 + 8 + 1 + 22 + 1];
+ const unsigned char *sp, *ep;
+ char *p;
unsigned char final[17]; /* final[16] exists only to aid in looping */
- int sl,pl,i,__md5__magic_len,pw_len;
+ int sl,pl,i,pw_len;
struct MD5Context ctx,ctx1;
unsigned long l;
sp = salt;
/* If it starts with the magic string, then skip that */
- __md5__magic_len = strlen(__md5__magic);
- if(!strncmp(sp,__md5__magic,__md5__magic_len))
- sp += __md5__magic_len;
+ if(!strncmp(sp,__md5__magic,MD5_MAGIC_LEN))
+ sp += MD5_MAGIC_LEN;
/* It stops at the first '$', max 8 chars */
for(ep=sp;*ep && *ep != '$' && ep < (sp+8);ep++)
__md5_Update(&ctx,pw,pw_len);
/* Then our magic string */
- __md5_Update(&ctx,__md5__magic,__md5__magic_len);
+ __md5_Update(&ctx,__md5__magic,MD5_MAGIC_LEN);
/* Then the raw salt */
__md5_Update(&ctx,sp,sl);
}
/* Now make the output string */
- strcpy(passwd,__md5__magic);
- strncat(passwd,sp,sl);
- strcat(passwd,"$");
+ strcpy(passwd,__md5__magic); /* 3 bytes */
+ strncpy(passwd+MD5_MAGIC_LEN,(char*)sp,sl); /* 8 or less */
+ passwd[MD5_MAGIC_LEN+sl] = '$';
__md5_Final(final,&ctx);
__md5_Final(final,&ctx1);
}
- p = passwd + strlen(passwd);
-
+ /* Add 5*4+2 = 22 bytes of hash, + NUL byte. */
+ p = passwd + MD5_MAGIC_LEN + sl + 1;
final[16] = final[5];
for ( i=0 ; i < 5 ; i++ ) {
l = (final[i]<<16) | (final[i+6]<<8) | final[i+12];
- __md5_to64(p,l,4); p += 4;
+ __md5_to64(p,l,4);
+ p += 4;
}
l = final[11];
- __md5_to64(p,l,2); p += 2;
+ __md5_to64(p,l,2);
+ p += 2;
*p = '\0';
/* Don't leave anything around in vm they could use. */
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