Add functions des_set_key_checked, des_set_key_unchecked.

Never use des_set_key (it depends on the global variable des_check_key),
but usually des_set_key_unchecked.
Only destest.c bothered to look at the return values of des_set_key,
but it did not set des_check_key -- if it had done so,
most checks would have failed because of wrong parity and
because of weak keys.
This commit is contained in:
Bodo Möller 1999-12-03 20:24:21 +00:00
parent 21131f00d7
commit cddfe788fb
21 changed files with 106 additions and 103 deletions

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@ -4,6 +4,14 @@
Changes between 0.9.4 and 0.9.5 [xx XXX 1999]
*) Add variants des_set_key_checked and des_set_key_unchecked of
des_set_key (aka des_key_sched). Global variable des_check_key
decides which of these is called by des_set_key; this way
des_check_key behaves as it always did, but applications and
the library itself, which was buggy for des_check_key == 1,
have a cleaner way to pick the version they need.
[Bodo Moeller]
*) New function PKCS12_newpass() which changes the password of a
PKCS12 structure.
[Steve Henson]

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@ -590,9 +590,9 @@ int MAIN(int argc, char **argv)
#endif
#ifndef NO_DES
des_set_key(&key,sch);
des_set_key(&key2,sch2);
des_set_key(&key3,sch3);
des_set_key_unchecked(&key,sch);
des_set_key_unchecked(&key2,sch2);
des_set_key_unchecked(&key3,sch3);
#endif
#ifndef NO_IDEA
idea_set_encrypt_key(key16,&idea_ks);

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@ -425,7 +425,7 @@ void doencryption(void)
else
k2[i-8]=k;
}
des_set_key(&k2,ks2);
des_set_key_unchecked(&k2,ks2);
memset(k2,0,sizeof(k2));
}
else if (longk || flag3)
@ -433,7 +433,7 @@ void doencryption(void)
if (flag3)
{
des_string_to_2keys(key,&kk,&k2);
des_set_key(&k2,ks2);
des_set_key_unchecked(&k2,ks2);
memset(k2,0,sizeof(k2));
}
else
@ -455,7 +455,7 @@ void doencryption(void)
kk[i]=key[i]|0x80;
}
des_set_key(&kk,ks);
des_set_key_unchecked(&kk,ks);
memset(key,0,sizeof(key));
memset(kk,0,sizeof(kk));
/* woops - A bug that does not showup under unix :-( */

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@ -193,8 +193,13 @@ int des_read_2passwords(des_cblock *key1,des_cblock *key2,
int des_read_pw_string(char *buf,int length,const char *prompt,int verify);
void des_set_odd_parity(des_cblock *key);
int des_is_weak_key(const_des_cblock *key);
/* des_set_key (= set_key = des_key_sched = key_sched) calls
* des_set_key_checked if global variable des_check_key is set,
* des_set_key_unchecked otherwise. */
int des_set_key(const_des_cblock *key,des_key_schedule schedule);
int des_key_sched(const_des_cblock *key,des_key_schedule schedule);
int des_set_key_checked(const_des_cblock *key,des_key_schedule schedule);
void des_set_key_unchecked(const_des_cblock *key,des_key_schedule schedule);
void des_string_to_key(const char *str,des_cblock *key);
void des_string_to_2keys(const char *str,des_cblock *key1,des_cblock *key2);
void des_cfb64_encrypt(const unsigned char *in,unsigned char *out,long length,

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@ -438,13 +438,13 @@ int main(int argc, char **argv)
fprintf(stderr,"program when this computer is idle.\n");
#endif
des_set_key(&key,sch);
des_set_key(&key2,sch2);
des_set_key(&key3,sch3);
des_set_key_unchecked(&key,sch);
des_set_key_unchecked(&key2,sch2);
des_set_key_unchecked(&key3,sch3);
#ifndef SIGALRM
fprintf(stderr,"First we calculate the approximate speed ...\n");
des_set_key(&key,sch);
des_set_key_unchecked(&key,sch);
count=10;
do {
long i;

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@ -234,7 +234,8 @@ static unsigned char cipher_ecb2[NUM_TESTS-1][8]={
{0x08,0xD7,0xB4,0xFB,0x62,0x9D,0x08,0x85}};
static unsigned char cbc_key [8]={0x01,0x23,0x45,0x67,0x89,0xab,0xcd,0xef};
static unsigned char cbc2_key[8]={0xf0,0xe1,0xd2,0xc3,0xb4,0xa5,0x96,0x87};
/* static unsigned char cbc2_key[8]={0xf0,0xe1,0xd2,0xc3,0xb4,0xa5,0x96,0x87}; */
static unsigned char cbc2_key[8]={0xf1,0xe0,0xd3,0xc2,0xb5,0xa4,0x97,0x86};
static unsigned char cbc3_key[8]={0xfe,0xdc,0xba,0x98,0x76,0x54,0x32,0x10};
static unsigned char cbc_iv [8]={0xfe,0xdc,0xba,0x98,0x76,0x54,0x32,0x10};
/* Changed the following text constant to binary so it will work on ebcdic
@ -331,17 +332,17 @@ int main(int argc, char *argv[])
#ifndef NO_DESCBCM
printf("Doing cbcm\n");
if ((j=des_key_sched(&cbc_key,ks)) != 0)
if ((j=des_set_key_checked(&cbc_key,ks)) != 0)
{
printf("Key error %d\n",j);
err=1;
}
if ((j=des_key_sched(&cbc2_key,ks2)) != 0)
if ((j=des_set_key_checked(&cbc2_key,ks2)) != 0)
{
printf("Key error %d\n",j);
err=1;
}
if ((j=des_key_sched(&cbc3_key,ks3)) != 0)
if ((j=des_set_key_checked(&cbc3_key,ks3)) != 0)
{
printf("Key error %d\n",j);
err=1;
@ -385,11 +386,7 @@ int main(int argc, char *argv[])
printf("Doing ecb\n");
for (i=0; i<NUM_TESTS; i++)
{
if ((j=des_key_sched(&key_data[i],ks)) != 0)
{
printf("Key error %2d:%d\n",i+1,j);
err=1;
}
des_set_key_unchecked(&key_data[i],ks);
memcpy(in,plain_data[i],8);
memset(out,0,8);
memset(outin,0,8);
@ -415,21 +412,9 @@ int main(int argc, char *argv[])
printf("Doing ede ecb\n");
for (i=0; i<(NUM_TESTS-1); i++)
{
if ((j=des_key_sched(&key_data[i],ks)) != 0)
{
err=1;
printf("Key error %2d:%d\n",i+1,j);
}
if ((j=des_key_sched(&key_data[i+1],ks2)) != 0)
{
printf("Key error %2d:%d\n",i+2,j);
err=1;
}
if ((j=des_key_sched(&key_data[i+2],ks3)) != 0)
{
printf("Key error %2d:%d\n",i+3,j);
err=1;
}
des_set_key_unchecked(&key_data[i],ks);
des_set_key_unchecked(&key_data[i+1],ks2);
des_set_key_unchecked(&key_data[i+2],ks3);
memcpy(in,plain_data[i],8);
memset(out,0,8);
memset(outin,0,8);
@ -453,7 +438,7 @@ int main(int argc, char *argv[])
#endif
printf("Doing cbc\n");
if ((j=des_key_sched(&cbc_key,ks)) != 0)
if ((j=des_set_key_checked(&cbc_key,ks)) != 0)
{
printf("Key error %d\n",j);
err=1;
@ -477,7 +462,7 @@ int main(int argc, char *argv[])
#ifndef LIBDES_LIT
printf("Doing desx cbc\n");
if ((j=des_key_sched(&cbc_key,ks)) != 0)
if ((j=des_set_key_checked(&cbc_key,ks)) != 0)
{
printf("Key error %d\n",j);
err=1;
@ -502,17 +487,17 @@ int main(int argc, char *argv[])
#endif
printf("Doing ede cbc\n");
if ((j=des_key_sched(&cbc_key,ks)) != 0)
if ((j=des_set_key_checked(&cbc_key,ks)) != 0)
{
printf("Key error %d\n",j);
err=1;
}
if ((j=des_key_sched(&cbc2_key,ks2)) != 0)
if ((j=des_set_key_checked(&cbc2_key,ks2)) != 0)
{
printf("Key error %d\n",j);
err=1;
}
if ((j=des_key_sched(&cbc3_key,ks3)) != 0)
if ((j=des_set_key_checked(&cbc3_key,ks3)) != 0)
{
printf("Key error %d\n",j);
err=1;
@ -543,7 +528,7 @@ int main(int argc, char *argv[])
#ifndef LIBDES_LIT
printf("Doing pcbc\n");
if ((j=des_key_sched(&cbc_key,ks)) != 0)
if ((j=des_set_key_checked(&cbc_key,ks)) != 0)
{
printf("Key error %d\n",j);
err=1;
@ -606,7 +591,7 @@ int main(int argc, char *argv[])
printf("done\n");
printf("Doing ofb\n");
des_key_sched(&ofb_key,ks);
des_set_key_checked(&ofb_key,ks);
memcpy(ofb_tmp,ofb_iv,sizeof(ofb_iv));
des_ofb_encrypt(plain,ofb_buf1,64,sizeof(plain)/8,ks,&ofb_tmp);
if (memcmp(ofb_cipher,ofb_buf1,sizeof(ofb_buf1)) != 0)
@ -635,7 +620,7 @@ plain[8+4], plain[8+5], plain[8+6], plain[8+7]);
}
printf("Doing ofb64\n");
des_key_sched(&ofb_key,ks);
des_set_key_checked(&ofb_key,ks);
memcpy(ofb_tmp,ofb_iv,sizeof(ofb_iv));
memset(ofb_buf1,0,sizeof(ofb_buf1));
memset(ofb_buf2,0,sizeof(ofb_buf1));
@ -660,7 +645,7 @@ plain[8+4], plain[8+5], plain[8+6], plain[8+7]);
}
printf("Doing ede_ofb64\n");
des_key_sched(&ofb_key,ks);
des_set_key_checked(&ofb_key,ks);
memcpy(ofb_tmp,ofb_iv,sizeof(ofb_iv));
memset(ofb_buf1,0,sizeof(ofb_buf1));
memset(ofb_buf2,0,sizeof(ofb_buf1));
@ -686,7 +671,7 @@ plain[8+4], plain[8+5], plain[8+6], plain[8+7]);
}
printf("Doing cbc_cksum\n");
des_key_sched(&cbc_key,ks);
des_set_key_checked(&cbc_key,ks);
cs=des_cbc_cksum(cbc_data,&cret,strlen((char *)cbc_data),ks,&cbc_iv);
if (cs != cbc_cksum_ret)
{
@ -825,7 +810,7 @@ static int cfb_test(int bits, unsigned char *cfb_cipher)
des_key_schedule ks;
int i,err=0;
des_key_sched(&cfb_key,ks);
des_set_key_checked(&cfb_key,ks);
memcpy(cfb_tmp,cfb_iv,sizeof(cfb_iv));
des_cfb_encrypt(plain,cfb_buf1,bits,sizeof(plain),ks,&cfb_tmp,
DES_ENCRYPT);
@ -854,7 +839,7 @@ static int cfb64_test(unsigned char *cfb_cipher)
des_key_schedule ks;
int err=0,i,n;
des_key_sched(&cfb_key,ks);
des_set_key_checked(&cfb_key,ks);
memcpy(cfb_tmp,cfb_iv,sizeof(cfb_iv));
n=0;
des_cfb64_encrypt(plain,cfb_buf1,12,ks,&cfb_tmp,&n,DES_ENCRYPT);
@ -887,7 +872,7 @@ static int ede_cfb64_test(unsigned char *cfb_cipher)
des_key_schedule ks;
int err=0,i,n;
des_key_sched(&cfb_key,ks);
des_set_key_checked(&cfb_key,ks);
memcpy(cfb_tmp,cfb_iv,sizeof(cfb_iv));
n=0;
des_ede3_cfb64_encrypt(plain,cfb_buf1,12,ks,ks,ks,&cfb_tmp,&n,

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@ -151,7 +151,7 @@ r=(r+7)/8;
for (; i<8; i++)
key[i]=0;
des_set_key(&key,ks);
des_set_key_unchecked(&key,ks);
fcrypt_body(&(out[0]),ks,Eswap0,Eswap1);
ll=out[0]; l2c(ll,b);

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@ -100,11 +100,11 @@ void des_random_key(des_cblock *ret)
l2c(t,p);
des_set_odd_parity(&data);
des_set_key(&data,ks);
des_set_key_unchecked(&data,ks);
des_cbc_cksum(key,&key,sizeof(key),ks,&data);
des_set_odd_parity(&key);
des_set_key(&key,ks);
des_set_key_unchecked(&key,ks);
des_cbc_cksum(key,&data,sizeof(key),ks,&key);
memcpy(ret,data,sizeof(key));

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@ -66,7 +66,7 @@ int _des_crypt(char *buf, int len, struct desparams *desp)
des_key_schedule ks;
int enc;
des_set_key(&desp->des_key,ks);
des_set_key_unchecked(&desp->des_key,ks);
enc=(desp->des_dir == ENCRYPT)?DES_ENCRYPT:DES_DECRYPT;
if (desp->des_mode == CBC)

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@ -145,11 +145,34 @@ int des_is_weak_key(const_des_cblock *key)
#define HPERM_OP(a,t,n,m) ((t)=((((a)<<(16-(n)))^(a))&(m)),\
(a)=(a)^(t)^(t>>(16-(n))))
int des_set_key(const_des_cblock *key, des_key_schedule schedule)
{
if (des_check_key)
{
return des_set_key_checked(key, schedule);
}
else
{
des_set_key_unchecked(key, schedule);
return 0;
}
}
/* return 0 if key parity is odd (correct),
* return -1 if key parity error,
* return -2 if illegal weak key.
*/
int des_set_key(const_des_cblock *key, des_key_schedule schedule)
int des_set_key_checked(const_des_cblock *key, des_key_schedule schedule)
{
if (!check_parity(key))
return(-1);
if (des_is_weak_key(key))
return(-2);
des_set_key_unchecked(key, schedule);
return 0;
}
void des_set_key_unchecked(const_des_cblock *key, des_key_schedule schedule)
{
static int shifts2[16]={0,0,1,1,1,1,1,1,0,1,1,1,1,1,1,0};
register DES_LONG c,d,t,s,t2;
@ -157,15 +180,6 @@ int des_set_key(const_des_cblock *key, des_key_schedule schedule)
register DES_LONG *k;
register int i;
if (des_check_key)
{
if (!check_parity(key))
return(-1);
if (des_is_weak_key(key))
return(-2);
}
k = &schedule->ks.deslong[0];
in = &(*key)[0];
@ -225,7 +239,6 @@ int des_set_key(const_des_cblock *key, des_key_schedule schedule)
t2=((s>>16L)|(t&0xffff0000L));
*(k++)=ROTATE(t2,26)&0xffffffffL;
}
return(0);
}
int des_key_sched(const_des_cblock *key, des_key_schedule schedule)

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@ -190,12 +190,12 @@ int main(int argc, char **argv)
printf("program when this computer is idle.\n");
#endif
des_set_key(&key2,sch2);
des_set_key(&key3,sch3);
des_set_key_unchecked(&key2,sch2);
des_set_key_unchecked(&key3,sch3);
#ifndef SIGALRM
printf("First we calculate the approximate speed ...\n");
des_set_key(&key,sch);
des_set_key_unchecked(&key,sch);
count=10;
do {
long i;
@ -225,7 +225,7 @@ int main(int argc, char **argv)
Time_F(START);
for (count=0,run=1; COND(ca); count++)
des_set_key(&key,sch);
des_set_key_unchecked(&key,sch);
d=Time_F(STOP);
printf("%ld set_key's in %.2f seconds\n",count,d);
a=((double)COUNT(ca))/d;

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@ -58,8 +58,6 @@
#include "des_locl.h"
OPENSSL_EXTERN int des_check_key;
void des_string_to_key(const char *str, des_cblock *key)
{
des_key_schedule ks;
@ -88,10 +86,7 @@ void des_string_to_key(const char *str, des_cblock *key)
}
#endif
des_set_odd_parity(key);
i=des_check_key;
des_check_key=0;
des_set_key(key,ks);
des_check_key=i;
des_set_key_unchecked(key,ks);
des_cbc_cksum((unsigned char*)str,key,length,ks,key);
memset(ks,0,sizeof(ks));
des_set_odd_parity(key);
@ -150,13 +145,10 @@ void des_string_to_2keys(const char *str, des_cblock *key1, des_cblock *key2)
#endif
des_set_odd_parity(key1);
des_set_odd_parity(key2);
i=des_check_key;
des_check_key=0;
des_set_key(key1,ks);
des_set_key_unchecked(key1,ks);
des_cbc_cksum((unsigned char*)str,key1,length,ks,key1);
des_set_key(key2,ks);
des_set_key_unchecked(key2,ks);
des_cbc_cksum((unsigned char*)str,key2,length,ks,key2);
des_check_key=i;
memset(ks,0,sizeof(ks));
des_set_odd_parity(key1);
des_set_odd_parity(key2);

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@ -115,8 +115,8 @@ static void des_cbc_ede_init_key(EVP_CIPHER_CTX *ctx, unsigned char *key,
if (deskey != NULL)
{
des_set_key(&deskey[0],ctx->c.des_ede.ks1);
des_set_key(&deskey[1],ctx->c.des_ede.ks2);
des_set_key_unchecked(&deskey[0],ctx->c.des_ede.ks1);
des_set_key_unchecked(&deskey[1],ctx->c.des_ede.ks2);
memcpy( (char *)ctx->c.des_ede.ks3,
(char *)ctx->c.des_ede.ks1,
sizeof(ctx->c.des_ede.ks1));
@ -134,9 +134,9 @@ static void des_cbc_ede3_init_key(EVP_CIPHER_CTX *ctx, unsigned char *key,
if (deskey != NULL)
{
des_set_key(&deskey[0],ctx->c.des_ede.ks1);
des_set_key(&deskey[1],ctx->c.des_ede.ks2);
des_set_key(&deskey[2],ctx->c.des_ede.ks3);
des_set_key_unchecked(&deskey[0],ctx->c.des_ede.ks1);
des_set_key_unchecked(&deskey[1],ctx->c.des_ede.ks2);
des_set_key_unchecked(&deskey[2],ctx->c.des_ede.ks3);
}
}

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@ -116,8 +116,8 @@ static void des_ede_cfb_init_key(EVP_CIPHER_CTX *ctx, unsigned char *key,
memcpy(&(ctx->iv[0]),&(ctx->oiv[0]),8);
if (deskey != NULL)
{
des_set_key(&deskey[0],ctx->c.des_ede.ks1);
des_set_key(&deskey[1],ctx->c.des_ede.ks2);
des_set_key_unchecked(&deskey[0],ctx->c.des_ede.ks1);
des_set_key_unchecked(&deskey[1],ctx->c.des_ede.ks2);
memcpy( (char *)ctx->c.des_ede.ks3,
(char *)ctx->c.des_ede.ks1,
sizeof(ctx->c.des_ede.ks1));
@ -136,9 +136,9 @@ static void des_ede3_cfb_init_key(EVP_CIPHER_CTX *ctx, unsigned char *key,
memcpy(&(ctx->iv[0]),&(ctx->oiv[0]),8);
if (deskey != NULL)
{
des_set_key(&deskey[0],ctx->c.des_ede.ks1);
des_set_key(&deskey[1],ctx->c.des_ede.ks2);
des_set_key(&deskey[2],ctx->c.des_ede.ks3);
des_set_key_unchecked(&deskey[0],ctx->c.des_ede.ks1);
des_set_key_unchecked(&deskey[1],ctx->c.des_ede.ks2);
des_set_key_unchecked(&deskey[2],ctx->c.des_ede.ks3);
}
}

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@ -95,7 +95,7 @@ static void des_cfb_init_key(EVP_CIPHER_CTX *ctx, unsigned char *key,
memcpy(&(ctx->oiv[0]),iv,8);
memcpy(&(ctx->iv[0]),&(ctx->oiv[0]),8);
if (deskey != NULL)
des_set_key(deskey,ctx->c.des_ks);
des_set_key_unchecked(deskey,ctx->c.des_ks);
}
static void des_cfb_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,

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@ -110,8 +110,8 @@ static void des_ede_init_key(EVP_CIPHER_CTX *ctx, unsigned char *key,
if (deskey != NULL)
{
des_set_key(&deskey[0],ctx->c.des_ede.ks1);
des_set_key(&deskey[1],ctx->c.des_ede.ks2);
des_set_key_unchecked(&deskey[0],ctx->c.des_ede.ks1);
des_set_key_unchecked(&deskey[1],ctx->c.des_ede.ks2);
memcpy( (char *)ctx->c.des_ede.ks3,
(char *)ctx->c.des_ede.ks1,
sizeof(ctx->c.des_ede.ks1));
@ -125,9 +125,9 @@ static void des_ede3_init_key(EVP_CIPHER_CTX *ctx, unsigned char *key,
if (deskey != NULL)
{
des_set_key(&deskey[0],ctx->c.des_ede.ks1);
des_set_key(&deskey[1],ctx->c.des_ede.ks2);
des_set_key(&deskey[2],ctx->c.des_ede.ks3);
des_set_key_unchecked(&deskey[0],ctx->c.des_ede.ks1);
des_set_key_unchecked(&deskey[1],ctx->c.des_ede.ks2);
des_set_key_unchecked(&deskey[2],ctx->c.des_ede.ks3);
}
}

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@ -90,7 +90,7 @@ static void des_ecb_init_key(EVP_CIPHER_CTX *ctx, unsigned char *key,
des_cblock *deskey = (des_cblock *)key;
if (deskey != NULL)
des_set_key(deskey,ctx->c.des_ks);
des_set_key_unchecked(deskey,ctx->c.des_ks);
}
static void des_ecb_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,

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@ -116,8 +116,8 @@ static void des_ede_ofb_init_key(EVP_CIPHER_CTX *ctx, unsigned char *key,
memcpy(&(ctx->iv[0]),&(ctx->oiv[0]),8);
if (deskey != NULL)
{
des_set_key(&deskey[0],ctx->c.des_ede.ks1);
des_set_key(&deskey[1],ctx->c.des_ede.ks2);
des_set_key_unchecked(&deskey[0],ctx->c.des_ede.ks1);
des_set_key_unchecked(&deskey[1],ctx->c.des_ede.ks2);
memcpy( (char *)ctx->c.des_ede.ks3,
(char *)ctx->c.des_ede.ks1,
sizeof(ctx->c.des_ede.ks1));
@ -136,9 +136,9 @@ static void des_ede3_ofb_init_key(EVP_CIPHER_CTX *ctx, unsigned char *key,
memcpy(&(ctx->iv[0]),&(ctx->oiv[0]),8);
if (deskey != NULL)
{
des_set_key(&deskey[0],ctx->c.des_ede.ks1);
des_set_key(&deskey[1],ctx->c.des_ede.ks2);
des_set_key(&deskey[2],ctx->c.des_ede.ks3);
des_set_key_unchecked(&deskey[0],ctx->c.des_ede.ks1);
des_set_key_unchecked(&deskey[1],ctx->c.des_ede.ks2);
des_set_key_unchecked(&deskey[2],ctx->c.des_ede.ks3);
}
}

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@ -95,7 +95,7 @@ static void des_ofb_init_key(EVP_CIPHER_CTX *ctx, unsigned char *key,
memcpy(&(ctx->oiv[0]),iv,8);
memcpy(&(ctx->iv[0]),&(ctx->oiv[0]),8);
if (deskey != NULL)
des_set_key(deskey,ctx->c.des_ks);
des_set_key_unchecked(deskey,ctx->c.des_ks);
}
static void des_ofb_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,

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@ -94,7 +94,7 @@ static void desx_cbc_init_key(EVP_CIPHER_CTX *ctx, unsigned char *key,
memcpy(&(ctx->iv[0]),&(ctx->oiv[0]),8);
if (deskey != NULL)
{
des_set_key(deskey,ctx->c.desx_cbc.ks);
des_set_key_unchecked(deskey,ctx->c.desx_cbc.ks);
memcpy(&(ctx->c.desx_cbc.inw[0]),&(key[8]),8);
memcpy(&(ctx->c.desx_cbc.outw[0]),&(key[16]),8);
}

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@ -135,11 +135,11 @@ static void mdc2_body(MDC2_CTX *c, unsigned char *in, unsigned int len)
c->hh[0]=(c->hh[0]&0x9f)|0x20;
des_set_odd_parity(&c->h);
des_set_key(&c->h,k);
des_set_key_unchecked(&c->h,k);
des_encrypt(d,k,1);
des_set_odd_parity(&c->hh);
des_set_key(&c->hh,k);
des_set_key_unchecked(&c->hh,k);
des_encrypt(dd,k,1);
ttin0=tin0^dd[0];