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/* -*- mode: c; indent-tabs-mode: nil -*- */
/*
* lib/krb5/rcache/rc_conv.c
*
* This file of the Kerberos V5 software is derived from public-domain code
* contributed by Daniel J. Bernstein, <brnstnd@acf10.nyu.edu>.
*
*/
/*
* An implementation for the default replay cache type.
*/
#include "rc_base.h"
/*
Local stuff:
krb5_auth_to_replay(context, krb5_tkt_authent *auth,krb5_donot_replay *rep)
given auth, take important information and make rep; return -1 if failed
*/
krb5_error_code
krb5_auth_to_rep(krb5_context context, krb5_tkt_authent *auth, krb5_donot_replay *rep)
{
krb5_error_code retval;
rep->cusec = auth->authenticator->cusec;
rep->ctime = auth->authenticator->ctime;
if ((retval = krb5_unparse_name(context, auth->ticket->server, &rep->server)))
return retval; /* shouldn't happen */
if ((retval = krb5_unparse_name(context, auth->authenticator->client,
&rep->client))) {
free(rep->server);
return retval; /* shouldn't happen. */
}
return 0;
}
/*
* Generate a printable hash value for a message for use in a replay
* record. It is not necessary for this hash function to be
* collision-proof (the only thing you can do with a second preimage
* is produce a false replay error) but it is necessary for the
* function to be consistent across implementations. We do an unkeyed
* MD5 hash of the message and convert it into uppercase hex
* representation.
*/
krb5_error_code
krb5_rc_hash_message(krb5_context context, const krb5_data *message,
char **out)
{
krb5_error_code retval;
krb5_checksum cksum;
char *hash, *ptr;
unsigned int i;
*out = NULL;
/* Calculate the binary checksum. */
retval = krb5_c_make_checksum(context, CKSUMTYPE_RSA_MD5, 0, 0,
message, &cksum);
if (retval)
return retval;
/* Convert the checksum into printable form. */
hash = malloc(cksum.length * 2 + 1);
if (!hash) {
krb5_free_checksum_contents(context, &cksum);
return KRB5_RC_MALLOC;
}
for (i = 0, ptr = hash; i < cksum.length; i++, ptr += 2)
snprintf(ptr, 3, "%02X", cksum.contents[i]);
*ptr = '\0';
*out = hash;
krb5_free_checksum_contents(context, &cksum);
return 0;
}
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