diff options
Diffstat (limited to 'crypto/libdes/rand_key.c')
-rw-r--r-- | crypto/libdes/rand_key.c | 117 |
1 files changed, 117 insertions, 0 deletions
diff --git a/crypto/libdes/rand_key.c b/crypto/libdes/rand_key.c new file mode 100644 index 0000000..4e89dbc --- /dev/null +++ b/crypto/libdes/rand_key.c @@ -0,0 +1,117 @@ +/* crypto/des/rand_key.c */ +/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) + * All rights reserved. + * + * This package is an SSL implementation written + * by Eric Young (eay@cryptsoft.com). + * The implementation was written so as to conform with Netscapes SSL. + * + * This library is free for commercial and non-commercial use as long as + * the following conditions are aheared to. The following conditions + * apply to all code found in this distribution, be it the RC4, RSA, + * lhash, DES, etc., code; not just the SSL code. The SSL documentation + * included with this distribution is covered by the same copyright terms + * except that the holder is Tim Hudson (tjh@cryptsoft.com). + * + * Copyright remains Eric Young's, and as such any Copyright notices in + * the code are not to be removed. + * If this package is used in a product, Eric Young should be given attribution + * as the author of the parts of the library used. + * This can be in the form of a textual message at program startup or + * in documentation (online or textual) provided with the package. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. All advertising materials mentioning features or use of this software + * must display the following acknowledgement: + * "This product includes cryptographic software written by + * Eric Young (eay@cryptsoft.com)" + * The word 'cryptographic' can be left out if the rouines from the library + * being used are not cryptographic related :-). + * 4. If you include any Windows specific code (or a derivative thereof) from + * the apps directory (application code) you must include an acknowledgement: + * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" + * + * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + * + * The licence and distribution terms for any publically available version or + * derivative of this code cannot be changed. i.e. this code cannot simply be + * copied and put under another distribution licence + * [including the GNU Public Licence.] + * + * $FreeBSD$ + */ + +#include "des_locl.h" +#include <time.h> +#include <unistd.h> + +static int seed=0; +static des_cblock init; + +void des_random_seed(des_cblock *key) + { + memcpy(&init,key,sizeof(des_cblock)); + seed=1; + } + +void des_random_key(des_cblock *ret) + { + des_key_schedule ks; + static DES_LONG c=0; + static unsigned short pid=0; + static des_cblock data={0x01,0x23,0x45,0x67,0x89,0xab,0xcd,0xef}; + des_cblock key; + unsigned char *p; + DES_LONG t; + int i; + +#ifdef MSDOS + pid=1; +#else + if (!pid) pid=getpid(); +#endif + p=key; + if (seed) + { + for (i=0; i<8; i++) + { + data[i] ^= init[i]; + init[i]=0; + } + seed=0; + } + t=(DES_LONG)time(NULL); + l2c(t,p); + t=(DES_LONG)((pid)|((c++)<<16)); + l2c(t,p); + + des_set_odd_parity(&data); + des_set_key(&data,ks); + des_cbc_cksum(key,&key,sizeof(key),ks,&data); + + des_set_odd_parity(&key); + des_set_key(&key,ks); + des_cbc_cksum(key,&data,sizeof(key),ks,&key); + + memcpy(ret,data,sizeof(key)); + memset(key,0,sizeof(key)); + memset(ks,0,sizeof(ks)); + t=0; + } |