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33 * lib/gssapi/krb5/prf.c
35 * Copyright 2009 by the Massachusetts Institute of Technology.
36 * All Rights Reserved.
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55 * or implied warranty.
60 #include "gssapiP_eap.h"
62 #ifndef MIN /* Usually found in <sys/param.h>. */
63 #define MIN(_a,_b) ((_a)<(_b)?(_a):(_b))
67 gss_pseudo_random(OM_uint32 *minor,
70 const gss_buffer_t prf_in,
71 ssize_t desired_output_len,
82 prf_out->value = NULL;
84 if (!CTX_IS_ESTABLISHED(ctx))
85 return GSS_S_NO_CONTEXT;
93 if (prf_key != GSS_C_PRF_KEY_FULL &&
94 prf_key != GSS_C_PRF_KEY_FULL) {
99 prf_out->value = GSSEAP_MALLOC(desired_output_len);
100 if (prf_out->value == NULL) {
104 prf_out->length = desired_output_len;
106 code = krb5_c_prf_length(ctx->kerberosCtx,
112 ns.length = 4 + prf_in->length;
113 ns.data = GSSEAP_MALLOC(ns.length);
114 if (ns.data == NULL) {
120 t.data = GSSEAP_MALLOC(t.length);
121 if (t.data == NULL) {
126 memcpy(ns.data + 4, prf_in->value, prf_in->length);
128 p = (unsigned char *)prf_out->value;
129 while (desired_output_len > 0) {
130 store_uint32_be(i, ns.data);
132 code = krb5_c_prf(ctx->kerberosCtx, ctx->encryptionKey, &ns, &t);
136 memcpy(p, t.data, MIN(t.length, desired_output_len));
139 desired_output_len -= t.length;
145 gss_release_buffer(&tmpMinor, prf_out);
146 krb5_free_data_contents(ctx->kerberosCtx, &ns);
147 krb5_free_data_contents(ctx->kerberosCtx, &t);
150 return (code == 0) ? GSS_S_COMPLETE : GSS_S_FAILURE;