[openssh.git] / md5crypt.c

/*
 * ----------------------------------------------------------------------------
 * "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
 * this stuff is worth it, you can buy me a beer in return.   Poul-Henning Kamp
 * ----------------------------------------------------------------------------
 */

/*
 * Ported from FreeBSD to Linux, only minimal changes.  --marekm
 */

/*
 * Adapted from shadow-19990607 by Tudor Bosman, tudorb@jm.nu
 */

#include "config.h"

#ifdef HAVE_MD5_PASSWORDS

#include <unistd.h>
#include <string.h>

#ifdef HAVE_OPENSSL
#include <openssl/md5.h>
#endif

#ifdef HAVE_SSL
#include <ssl/md5.h>
#endif

static unsigned char itoa64[] =		/* 0 ... 63 => ascii - 64 */
	"./0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz";

static char	*magic = "$1$";	/*
                                 * This string is magic for
                                 * this algorithm.  Having
                                 * it this way, we can get
                                 * get better later on
                                 */

static void
to64(char *s, unsigned long v, int n)
{
	while (--n >= 0) {
		*s++ = itoa64[v&0x3f];
		v >>= 6;
	}
}

int
is_md5_salt(const char *salt)
{
        return (!strncmp(salt, magic, strlen(magic)));
}

/*
 * UNIX password
 *
 * Use MD5 for what it is best at...
 */

char *
md5_crypt(const char *pw, const char *salt)
{
	static char     passwd[120], *p;
	static const char *sp,*ep;
	unsigned char	final[16];
	int sl,pl,i,j;
	MD5_CTX	ctx,ctx1;
	unsigned long l;

	/* Refine the Salt first */
	sp = salt;

	/* If it starts with the magic string, then skip that */
	if(!strncmp(sp,magic,strlen(magic)))
		sp += strlen(magic);

	/* It stops at the first '$', max 8 chars */
	for(ep=sp;*ep && *ep != '$' && ep < (sp+8);ep++)
		continue;

	/* get the length of the true salt */
	sl = ep - sp;

	MD5_Init(&ctx);

	/* The password first, since that is what is most unknown */
	MD5_Update(&ctx,pw,strlen(pw));

	/* Then our magic string */
	MD5_Update(&ctx,magic,strlen(magic));

	/* Then the raw salt */
	MD5_Update(&ctx,sp,sl);

	/* Then just as many characters of the MD5(pw,salt,pw) */
	MD5_Init(&ctx1);
	MD5_Update(&ctx1,pw,strlen(pw));
	MD5_Update(&ctx1,sp,sl);
	MD5_Update(&ctx1,pw,strlen(pw));
	MD5_Final(final,&ctx1);
	for(pl = strlen(pw); pl > 0; pl -= 16)
		MD5_Update(&ctx,final,pl>16 ? 16 : pl);

	/* Don't leave anything around in vm they could use. */
	memset(final,0,sizeof final);

	/* Then something really weird... */
	for (j=0,i = strlen(pw); i ; i >>= 1)
		if(i&1)
		    MD5_Update(&ctx, final+j, 1);
		else
		    MD5_Update(&ctx, pw+j, 1);

	/* Now make the output string */
	strcpy(passwd,magic);
	strncat(passwd,sp,sl);
	strcat(passwd,"$");

	MD5_Final(final,&ctx);

	/*
	 * and now, just to make sure things don't run too fast
	 * On a 60 Mhz Pentium this takes 34 msec, so you would
	 * need 30 seconds to build a 1000 entry dictionary...
	 */
	for(i=0;i<1000;i++) {
		MD5_Init(&ctx1);
		if(i & 1)
			MD5_Update(&ctx1,pw,strlen(pw));
		else
			MD5_Update(&ctx1,final,16);

		if(i % 3)
			MD5_Update(&ctx1,sp,sl);

		if(i % 7)
			MD5_Update(&ctx1,pw,strlen(pw));

		if(i & 1)
			MD5_Update(&ctx1,final,16);
		else
			MD5_Update(&ctx1,pw,strlen(pw));
		MD5_Final(final,&ctx1);
	}

	p = passwd + strlen(passwd);

	l = (final[ 0]<<16) | (final[ 6]<<8) | final[12]; to64(p,l,4); p += 4;
	l = (final[ 1]<<16) | (final[ 7]<<8) | final[13]; to64(p,l,4); p += 4;
	l = (final[ 2]<<16) | (final[ 8]<<8) | final[14]; to64(p,l,4); p += 4;
	l = (final[ 3]<<16) | (final[ 9]<<8) | final[15]; to64(p,l,4); p += 4;
	l = (final[ 4]<<16) | (final[10]<<8) | final[ 5]; to64(p,l,4); p += 4;
	l =                    final[11]                ; to64(p,l,2); p += 2;
	*p = '\0';

	/* Don't leave anything around in vm they could use. */
	memset(final,0,sizeof final);

	return passwd;
}

#endif  /* HAVE_MD5_PASSWORDS */
Commit	Line	Data
caf3bc51	1	/*
	2	* ----------------------------------------------------------------------------
	3	* "THE BEER-WARE LICENSE" (Revision 42):
	4	* <phk@login.dknet.dk> wrote this file. As long as you retain this notice you
	5	* can do whatever you want with this stuff. If we meet some day, and you think
	6	* this stuff is worth it, you can buy me a beer in return. Poul-Henning Kamp
	7	* ----------------------------------------------------------------------------
	8	*/
	9
	10	/*
	11	* Ported from FreeBSD to Linux, only minimal changes. --marekm
	12	*/
	13
	14	/*
	15	* Adapted from shadow-19990607 by Tudor Bosman, tudorb@jm.nu
	16	*/
	17
	18	#include "config.h"
	19
	20	#ifdef HAVE_MD5_PASSWORDS
	21
	22	#include <unistd.h>
	23	#include <string.h>
	24
	25	#ifdef HAVE_OPENSSL
	26	#include <openssl/md5.h>
	27	#endif
	28
	29	#ifdef HAVE_SSL
	30	#include <ssl/md5.h>
	31	#endif
	32
	33	static unsigned char itoa64[] = /* 0 ... 63 => ascii - 64 */
	34	"./0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz";
	35
	36	static char magic = "$1$"; /
	37	* This string is magic for
	38	* this algorithm. Having
	39	* it this way, we can get
	40	* get better later on
	41	*/
	42
	43	static void
	44	to64(char *s, unsigned long v, int n)
	45	{
	46	while (--n >= 0) {
	47	*s++ = itoa64[v&0x3f];
	48	v >>= 6;
	49	}
	50	}
	51
	52	int
	53	is_md5_salt(const char *salt)
	54	{
	55	return (!strncmp(salt, magic, strlen(magic)));
	56	}
	57
	58	/*
	59	* UNIX password
	60	*
	61	* Use MD5 for what it is best at...
	62	*/
	63
	64	char *
65	md5_crypt(const char pw, const char salt)
66	{
67	static char passwd[120], *p;
68	static const char sp,ep;
69	unsigned char final[16];
70	int sl,pl,i,j;
71	MD5_CTX ctx,ctx1;
72	unsigned long l;
73
74	/* Refine the Salt first */
75	sp = salt;
76
77	/* If it starts with the magic string, then skip that */
78	if(!strncmp(sp,magic,strlen(magic)))
79	sp += strlen(magic);
80
81	/* It stops at the first '$', max 8 chars */
82	for(ep=sp;ep && ep != '$' && ep < (sp+8);ep++)
83	continue;
84
85	/* get the length of the true salt */
86	sl = ep - sp;
87
88	MD5_Init(&ctx);
89
90	/* The password first, since that is what is most unknown */
91	MD5_Update(&ctx,pw,strlen(pw));
92
93	/* Then our magic string */
94	MD5_Update(&ctx,magic,strlen(magic));
95
96	/* Then the raw salt */
97	MD5_Update(&ctx,sp,sl);
98
99	/* Then just as many characters of the MD5(pw,salt,pw) */
100	MD5_Init(&ctx1);
101	MD5_Update(&ctx1,pw,strlen(pw));
102	MD5_Update(&ctx1,sp,sl);
103	MD5_Update(&ctx1,pw,strlen(pw));
104	MD5_Final(final,&ctx1);
105	for(pl = strlen(pw); pl > 0; pl -= 16)
106	MD5_Update(&ctx,final,pl>16 ? 16 : pl);
107
108	/* Don't leave anything around in vm they could use. */
109	memset(final,0,sizeof final);
110
111	/* Then something really weird... */
112	for (j=0,i = strlen(pw); i ; i >>= 1)
113	if(i&1)
114	MD5_Update(&ctx, final+j, 1);
115	else
116	MD5_Update(&ctx, pw+j, 1);
117
118	/* Now make the output string */
119	strcpy(passwd,magic);
120	strncat(passwd,sp,sl);
121	strcat(passwd,"$");
122
123	MD5_Final(final,&ctx);
124
125	/*
126	* and now, just to make sure things don't run too fast
127	* On a 60 Mhz Pentium this takes 34 msec, so you would
128	* need 30 seconds to build a 1000 entry dictionary...
129	*/
130	for(i=0;i<1000;i++) {
131	MD5_Init(&ctx1);
132	if(i & 1)
133	MD5_Update(&ctx1,pw,strlen(pw));
134	else
135	MD5_Update(&ctx1,final,16);
136
137	if(i % 3)
138	MD5_Update(&ctx1,sp,sl);
139
140	if(i % 7)
141	MD5_Update(&ctx1,pw,strlen(pw));
142
143	if(i & 1)
144	MD5_Update(&ctx1,final,16);
145	else
146	MD5_Update(&ctx1,pw,strlen(pw));
147	MD5_Final(final,&ctx1);
148	}
149
150	p = passwd + strlen(passwd);
151
152	l = (final[ 0]<<16) \| (final[ 6]<<8) \| final[12]; to64(p,l,4); p += 4;
153	l = (final[ 1]<<16) \| (final[ 7]<<8) \| final[13]; to64(p,l,4); p += 4;
154	l = (final[ 2]<<16) \| (final[ 8]<<8) \| final[14]; to64(p,l,4); p += 4;
155	l = (final[ 3]<<16) \| (final[ 9]<<8) \| final[15]; to64(p,l,4); p += 4;
156	l = (final[ 4]<<16) \| (final[10]<<8) \| final[ 5]; to64(p,l,4); p += 4;
157	l = final[11] ; to64(p,l,2); p += 2;
158	*p = '\0';
159
160	/* Don't leave anything around in vm they could use. */
161	memset(final,0,sizeof final);
162
163	return passwd;
164	}
165
166	#endif /* HAVE_MD5_PASSWORDS */