aa0c1fc1c0
git-svn-id: svn://svn.h5l.se/heimdal/trunk/heimdal@1318 ec53bebd-3082-4978-b11e-865c3cabbd6b
72 lines
1.7 KiB
C
72 lines
1.7 KiB
C
#include <krb5_locl.h>
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#include "crc.h"
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RCSID("$Id$");
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krb5_error_code
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krb5_encrypt (krb5_context context,
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void *ptr,
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size_t len,
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krb5_keyblock *keyblock,
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krb5_data *result)
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{
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u_char *p;
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u_long crc;
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size_t sz;
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des_cblock key;
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des_key_schedule schedule;
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sz = len + 12;
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sz = (sz + 7) & ~7;
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p = malloc (sz);
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if (p == NULL)
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return ENOMEM;
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memset (p, 0, sz);
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des_rand_data (p, 8);
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memcpy (p + 12, ptr, len);
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crc_init_table ();
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crc = crc_update (p, sz, 0);
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p[8] = crc & 0xff;
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p[9] = (crc >> 8) & 0xff;
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p[10] = (crc >> 16) & 0xff;
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p[11] = (crc >> 24) & 0xff;
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memcpy (&key, keyblock->contents.data, sizeof(key));
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des_set_key (&key, schedule);
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des_cbc_encrypt ((des_cblock *)p, (des_cblock *)p, sz, schedule, &key, DES_ENCRYPT);
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result->data = p;
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result->length = sz;
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return 0;
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}
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krb5_error_code
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krb5_decrypt (krb5_context context,
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void *ptr,
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size_t len,
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krb5_keyblock *keyblock,
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krb5_data *result)
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{
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u_char *p = (u_char *)ptr;
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u_long my_crc, her_crc;
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des_cblock key;
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des_key_schedule schedule;
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memcpy (&key, keyblock->contents.data, sizeof(key));
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des_set_key (&key, schedule);
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des_cbc_encrypt ((des_cblock *)ptr, (des_cblock *)ptr, len, schedule, &key, DES_DECRYPT);
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her_crc = (p[11] << 24) | (p[10] << 16) | (p[9] << 8) | (p[8] << 0);
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memset (p + 8, 0, sizeof(her_crc));
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crc_init_table ();
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my_crc = crc_update (ptr, len, 0);
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if (my_crc != her_crc)
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return KRB5KRB_AP_ERR_BAD_INTEGRITY;
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result->length = len - 12;
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result->data = malloc(result->length);
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if (result->data == NULL)
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return ENOMEM;
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memcpy (result->data, (u_char *)ptr + 12, result->length);
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return 0;
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}
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