new file

git-svn-id: svn://svn.h5l.se/heimdal/trunk/heimdal@1264 ec53bebd-3082-4978-b11e-865c3cabbd6b

lib/krb5/encrypt.c

@@ -0,0 +1,67 @@
+#include <krb5_locl.h>
+#include <krb5_error.h>
+
+krb5_error_code
+krb5_encrypt (krb5_context context,
+	      void *ptr,
+	      size_t len,
+	      krb5_keyblock *keyblock,
+	      krb5_data *result)
+{
+  u_char *p;
+  u_long crc;
+  size_t sz;
+  des_cblock key;
+  des_key_schedule schedule;
+
+  sz = len + 12;
+  sz = (sz + 7) & ~7;
+  p = malloc (sz);
+  if (p == NULL)
+    return ENOMEM;
+  memset (p, 0, sz);
+  des_rand_data (p, 8);
+  memcpy (p + 12, ptr, len);
+  crc_init_table ();
+  crc = crc_update (p, sz, 0);
+  p[8]  = crc & 0xff;
+  p[9]  = (crc >> 8)  & 0xff;
+  p[10] = (crc >> 16) & 0xff;
+  p[11] = (crc >> 24) & 0xff;
+  
+  memcpy (&key, keyblock->contents.data, sizeof(key));
+  des_set_key (&key, schedule);
+  des_cbc_encrypt ((des_cblock *)p, (des_cblock *)p, sz, schedule, &key, DES_ENCRYPT);
+
+  result->data = p;
+  result->length = sz;
+  return 0;
+}
+
+krb5_error_code
+krb5_decrypt (krb5_context context,
+	      void *ptr,
+	      size_t len,
+	      krb5_keyblock *keyblock,
+	      krb5_data *result)
+{
+  u_char *p;
+  u_long crc;
+  des_cblock key;
+  des_key_schedule schedule;
+
+  memcpy (&key, keyblock->contents.data, sizeof(key));
+  des_set_key (&key, schedule);
+  des_cbc_encrypt ((des_cblock *)ptr, (des_cblock *)ptr, len, schedule, &key, DES_DECRYPT);
+
+  crc_init_table ();
+  crc = crc_update (ptr, len, 0);
+#if 0
+  if (crc)
+    return KRB5KRB_AP_ERR_BAD_INTEGRITY;
+#endif
+  result->length = len - 12;
+  result->data = malloc(result->length);
+  memcpy (result->data, (u_char *)ptr + 12, result->length);
+  return 0;
+}