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/*
* $Source$
* $Author$
*
* Copyright 1990 by the Massachusetts Institute of Technology.
*
* For copying and distribution information, please see the file
* <krb5/copyright.h>.
*
* krb5_rd_rep()
*/
#if !defined(lint) && !defined(SABER)
static char rcsid_rd_rep_dec_c[] =
"$Id$";
#endif /* !lint & !SABER */
#include <krb5/copyright.h>
#include <krb5/krb5.h>
#include <krb5/ext-proto.h>
#include <krb5/libos-proto.h>
#include <krb5/asn1.h>
/*
* Parses a KRB_AP_REP message, returning its contents.
*
* repl is filled in with with a pointer to allocated memory containing
* the fields from the encrypted response.
*
* the key in kblock is used to decrypt the message.
*
* returns system errors, encryption errors, replay errors
*/
krb5_error_code
krb5_rd_rep(inbuf, kblock, repl)
const krb5_data *inbuf;
const krb5_keyblock *kblock;
krb5_ap_rep_enc_part **repl;
{
krb5_error_code retval;
krb5_ap_rep *reply;
krb5_encrypt_block eblock;
krb5_data scratch;
if (!krb5_is_ap_rep(inbuf))
return KRB5KRB_AP_ERR_MSG_TYPE;
if (!valid_keytype(kblock->keytype))
return KRB5_PROG_KEYTYPE_NOSUPP;
/* decode it */
if (retval = decode_krb5_ap_rep(inbuf, &reply))
return retval;
/* put together an eblock for this encryption */
if (!valid_etype(reply->enc_part.etype)) {
krb5_free_ap_rep(reply);
return KRB5_PROG_ETYPE_NOSUPP;
}
krb5_use_cstype(&eblock, reply->enc_part.etype);
scratch.length = reply->enc_part.ciphertext.length;
if (!(scratch.data = malloc(scratch.length))) {
krb5_free_ap_rep(reply);
return(ENOMEM);
}
/* do any necessary key pre-processing */
if (retval = krb5_process_key(&eblock, kblock)) {
errout:
free(scratch.data);
krb5_free_ap_rep(reply);
return(retval);
}
/* call the encryption routine */
if (retval = krb5_decrypt((krb5_pointer) reply->enc_part.ciphertext.data,
(krb5_pointer) scratch.data,
scratch.length, &eblock, 0)) {
(void) krb5_finish_key(&eblock);
goto errout;
}
#define clean_scratch() {memset(scratch.data, 0, scratch.length); \
free(scratch.data);}
/* finished with the top-level encoding of the ap_rep */
krb5_free_ap_rep(reply);
if (retval = krb5_finish_key(&eblock)) {
clean_scratch();
return retval;
}
/* now decode the decrypted stuff */
retval = decode_krb5_ap_rep_enc_part(&scratch, repl);
clean_scratch();
return retval;
}
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