2968019168
git-svn-id: svn://svn.h5l.se/heimdal/trunk/heimdal@301 ec53bebd-3082-4978-b11e-865c3cabbd6b
90 lines
1.6 KiB
C
90 lines
1.6 KiB
C
#include "krb5_locl.h"
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static void reverse(unsigned char *p)
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{
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unsigned char tmp[8];
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unsigned int a, b;
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int i;
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a = 0;
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b = *(unsigned int*)p;
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for(i = 0; i < 32; i++){
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a >>= 1;
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a |= b & 0x80000000;
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b <<= 1;
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}
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*(unsigned int*)(tmp + 4) = a;
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a = 0;
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b = *(unsigned int*)(p + 4);
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for(i = 0; i < 32; i++){
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a >>= 1;
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a |= b & 0x80000000;
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b <<= 1;
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}
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*(unsigned int*)tmp = a;
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a = 0;
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b = 0;
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memmove(p, tmp, 8);
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memset(tmp, 0, 8);
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}
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krb5_error_code
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mit_des_string_to_key(const krb5_keytype keytype,
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krb5_keyblock *keyblock,
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krb5_data *data,
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krb5_data *salt)
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{
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unsigned char *p;
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unsigned char *key;
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unsigned char tmp[8];
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des_key_schedule sched;
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int len;
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int i, j;
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int odd = 0;
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len = data->length;
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if(salt)
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len += salt->length;
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len = (len / 8 + 1) * 8;
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p = (unsigned char*)malloc(len);
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memset(p, 0, len);
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memmove(p, data->data, data->length);
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if(salt)
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memmove(p + data->length, salt->data, salt->length);
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memset(key, 0, 8);
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for(i = 0; i < len; i += 8){
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memmove(tmp, p + i, 8);
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if(odd)
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reverse(tmp);
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#ifndef RFC1510
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else
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for(j = 0; j < 8; j++) tmp[j] <<= 1;
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#endif
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for(j = 0; j < 8; j++)
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key[j] ^= tmp[j];
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odd = !odd;
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}
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des_set_odd_parity(key);
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des_key_sched(key, &sched);
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des_cbc_cksum(key, key, 8, &sched, key);
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des_set_odd_parity(key);
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if(des_is_weak_key(key))
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key[8] ^= 0xf0;
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memset(p, 0, len);
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memset(tmp, 0, 8);
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free(p);
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keyblock->keytype = KEYTYPE_DES;
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keyblock->contents.data = key;
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keyblock->contents.length = 8;
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return 0;
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}
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