2 * Copyright (c) 2007 Kungliga Tekniska Högskolan
3 * (Royal Institute of Technology, Stockholm, Sweden).
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
17 * 3. Neither the name of the Institute nor the names of its contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
21 * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 #include "krb5/gsskrb5_locl.h"
36 RCSID("$Id: prf.c 21129 2007-06-18 20:28:44Z lha $");
39 _gsskrb5_pseudo_random(OM_uint32 *minor_status,
40 gss_ctx_id_t context_handle,
42 const gss_buffer_t prf_in,
43 ssize_t desired_output_len,
46 gsskrb5_ctx ctx = (gsskrb5_ctx)context_handle;
50 krb5_data input, output;
53 krb5_keyblock *key = NULL;
57 return GSS_S_NO_CONTEXT;
60 if (desired_output_len <= 0) {
65 GSSAPI_KRB5_INIT (&context);
68 case GSS_C_PRF_KEY_FULL:
69 _gsskrb5i_get_acceptor_subkey(ctx, context, &key);
71 case GSS_C_PRF_KEY_PARTIAL:
72 _gsskrb5i_get_initiator_subkey(ctx, context, &key);
75 _gsskrb5_set_status("unknown kerberos prf_key");
81 _gsskrb5_set_status("no prf_key found");
86 ret = krb5_crypto_init(context, key, 0, &crypto);
87 krb5_free_keyblock (context, key);
93 prf_out->value = malloc(desired_output_len);
94 if (prf_out->value == NULL) {
95 _gsskrb5_set_status("Out of memory");
96 *minor_status = GSS_KRB5_S_KG_INPUT_TOO_LONG;
97 krb5_crypto_destroy(context, crypto);
100 prf_out->length = desired_output_len;
102 HEIMDAL_MUTEX_lock(&ctx->ctx_id_mutex);
104 input.length = prf_in->length + 4;
105 input.data = malloc(prf_in->length + 4);
106 if (input.data == NULL) {
108 _gsskrb5_set_status("Out of memory");
109 *minor_status = GSS_KRB5_S_KG_INPUT_TOO_LONG;
110 gss_release_buffer(&junk, prf_out);
111 krb5_crypto_destroy(context, crypto);
112 HEIMDAL_MUTEX_unlock(&ctx->ctx_id_mutex);
113 return GSS_S_FAILURE;
115 memcpy(((unsigned char *)input.data) + 4, prf_in->value, prf_in->length);
119 while(desired_output_len > 0) {
120 _gsskrb5_encode_om_uint32(num, input.data);
121 ret = krb5_crypto_prf(context, crypto, &input, &output);
126 gss_release_buffer(&junk, prf_out);
127 krb5_crypto_destroy(context, crypto);
128 HEIMDAL_MUTEX_unlock(&ctx->ctx_id_mutex);
129 return GSS_S_FAILURE;
131 memcpy(p, output.data, min(desired_output_len, output.length));
133 desired_output_len -= output.length;
134 krb5_data_free(&output);
138 krb5_crypto_destroy(context, crypto);
140 HEIMDAL_MUTEX_unlock(&ctx->ctx_id_mutex);
142 return GSS_S_COMPLETE;