diff options
Diffstat (limited to 'lib/libcrypt/crypt-md5.c')
| -rw-r--r-- | lib/libcrypt/crypt-md5.c | 187 |
1 files changed, 187 insertions, 0 deletions
diff --git a/lib/libcrypt/crypt-md5.c b/lib/libcrypt/crypt-md5.c new file mode 100644 index 0000000..c112bd8 --- /dev/null +++ b/lib/libcrypt/crypt-md5.c @@ -0,0 +1,187 @@ +/* + * ---------------------------------------------------------------------------- + * "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 + * ---------------------------------------------------------------------------- + * + * $FreeBSD$ + * + */ + +#if defined(LIBC_SCCS) && !defined(lint) +static const char rcsid[] = \ +"$FreeBSD$"; +#endif /* LIBC_SCCS and not lint */ + +#include <unistd.h> +#include <stdio.h> +#include <string.h> +#include <md5.h> +#include <err.h> +#include "crypt.h" + +#ifdef __PIC__ +#include <dlfcn.h> + +#define MD5Init(ctx) dl_MD5Init(ctx) +#define MD5Update(ctx, data, len) dl_MD5Update(ctx, data, len) +#define MD5Final(dgst, ctx) dl_MD5Final(dgst, ctx) + +static void (*dl_MD5Init)(MD5_CTX *); +static void (*dl_MD5Update)(MD5_CTX *, const unsigned char *, unsigned int); +static void (*dl_MD5Final)(unsigned char digest[16], MD5_CTX *); +#endif + +/* + * UNIX password + */ + +char * +crypt_md5(pw, salt) + const char *pw; + const char *salt; +{ + static char *magic = "$1$"; /* + * This string is magic for + * this algorithm. Having + * it this way, we can get + * get better later on + */ + static char passwd[120], *p; + static const char *sp,*ep; + unsigned char final[MD5_SIZE]; + int sl,pl,i; + MD5_CTX ctx,ctx1; + unsigned long l; +#ifdef __PIC__ + void *libmd; +#endif + + /* 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; + +#ifdef __PIC__ + libmd = dlopen("libmd.so", RTLD_NOW); + if (libmd == NULL) { + warnx("libcrypt-md5: dlopen(libmd.so): %s\n", dlerror()); + return NULL; + } + dl_MD5Init = dlsym(libmd, "MD5Init"); + if (dl_MD5Init == NULL) { + warnx("libcrypt-md5: looking for MD5Init: %s\n", dlerror()); + dlclose(libmd); + return NULL; + } + dl_MD5Update = dlsym(libmd, "MD5Update"); + if (dl_MD5Update == NULL) { + warnx("libcrypt-md5: looking for MD5Update: %s\n", dlerror()); + dlclose(libmd); + return NULL; + } + dl_MD5Final = dlsym(libmd, "MD5Final"); + if (dl_MD5Final == NULL) { + warnx("libcrypt-md5: looking for MD5Final: %s\n", dlerror()); + dlclose(libmd); + return NULL; + } +#endif + MD5Init(&ctx); + + /* The password first, since that is what is most unknown */ + MD5Update(&ctx,pw,strlen(pw)); + + /* Then our magic string */ + MD5Update(&ctx,magic,strlen(magic)); + + /* Then the raw salt */ + MD5Update(&ctx,sp,sl); + + /* Then just as many characters of the MD5(pw,salt,pw) */ + MD5Init(&ctx1); + MD5Update(&ctx1,pw,strlen(pw)); + MD5Update(&ctx1,sp,sl); + MD5Update(&ctx1,pw,strlen(pw)); + MD5Final(final,&ctx1); + for(pl = strlen(pw); pl > 0; pl -= MD5_SIZE) + MD5Update(&ctx,final,pl>MD5_SIZE ? MD5_SIZE : pl); + + /* Don't leave anything around in vm they could use. */ + memset(final,0,sizeof final); + + /* Then something really weird... */ + for (i = strlen(pw); i ; i >>= 1) + if(i&1) + MD5Update(&ctx, final, 1); + else + MD5Update(&ctx, pw, 1); + + /* Now make the output string */ + strcpy(passwd,magic); + strncat(passwd,sp,sl); + strcat(passwd,"$"); + + MD5Final(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++) { + MD5Init(&ctx1); + if(i & 1) + MD5Update(&ctx1,pw,strlen(pw)); + else + MD5Update(&ctx1,final,MD5_SIZE); + + if(i % 3) + MD5Update(&ctx1,sp,sl); + + if(i % 7) + MD5Update(&ctx1,pw,strlen(pw)); + + if(i & 1) + MD5Update(&ctx1,final,MD5_SIZE); + else + MD5Update(&ctx1,pw,strlen(pw)); + MD5Final(final,&ctx1); + } + +#ifdef __PIC__ + dlclose(libmd); +#endif + p = passwd + strlen(passwd); + + l = (final[ 0]<<16) | (final[ 6]<<8) | final[12]; + _crypt_to64(p,l,4); p += 4; + l = (final[ 1]<<16) | (final[ 7]<<8) | final[13]; + _crypt_to64(p,l,4); p += 4; + l = (final[ 2]<<16) | (final[ 8]<<8) | final[14]; + _crypt_to64(p,l,4); p += 4; + l = (final[ 3]<<16) | (final[ 9]<<8) | final[15]; + _crypt_to64(p,l,4); p += 4; + l = (final[ 4]<<16) | (final[10]<<8) | final[ 5]; + _crypt_to64(p,l,4); p += 4; + l = final[11] ; + _crypt_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; +} + |
