1 files changed, 84 insertions, 0 deletions
diff --git a/src/lib/crypto/krb/prf.c b/src/lib/crypto/krb/prf.c
new file mode 100644
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+++ b/src/lib/crypto/krb/prf.c
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+/* -*- mode: c; c-basic-offset: 4; indent-tabs-mode: nil -*- */
+/* lib/crypto/krb/prf.c */
+/*
+ * Copyright (C) 2004 by the Massachusetts Institute of Technology.
+ * All rights reserved.
+ *
+ * Export of this software from the United States of America may
+ *   require a specific license from the United States Government.
+ *   It is the responsibility of any person or organization contemplating
+ *   export to obtain such a license before exporting.
+ *
+ * WITHIN THAT CONSTRAINT, permission to use, copy, modify, and
+ * distribute this software and its documentation for any purpose and
+ * without fee is hereby granted, provided that the above copyright
+ * notice appear in all copies and that both that copyright notice and
+ * this permission notice appear in supporting documentation, and that
+ * the name of M.I.T. not be used in advertising or publicity pertaining
+ * to distribution of the software without specific, written prior
+ * permission.  Furthermore if you modify this software you must label
+ * your software as modified software and not distribute it in such a
+ * fashion that it might be confused with the original M.I.T. software.
+ * M.I.T. makes no representations about the suitability of
+ * this software for any purpose.  It is provided "as is" without express
+ * or implied warranty.
+ */
+
+/*
+ * This contains the implementation of krb5_c_prf, which will find the
+ * enctype-specific PRF and then generate pseudo-random data.  This function
+ * yields krb5_c_prf_length bytes of output.
+ */
+
+#include "crypto_int.h"
+
+krb5_error_code KRB5_CALLCONV
+krb5_c_prf_length(krb5_context context, krb5_enctype enctype, size_t *len)
+{
+    const struct krb5_keytypes *ktp;
+
+    assert(len);
+    ktp = find_enctype(enctype);
+    if (ktp == NULL)
+        return KRB5_BAD_ENCTYPE;
+    *len = ktp->prf_length;
+    return 0;
+}
+
+krb5_error_code KRB5_CALLCONV
+krb5_k_prf(krb5_context context, krb5_key key,
+           krb5_data *input, krb5_data *output)
+{
+    const struct krb5_keytypes *ktp;
+    krb5_error_code ret;
+
+    assert(input && output);
+    assert(output->data);
+
+    ktp = find_enctype(key->keyblock.enctype);
+    if (ktp == NULL)
+        return KRB5_BAD_ENCTYPE;
+    if (ktp->prf == NULL)
+        return KRB5_CRYPTO_INTERNAL;
+
+    output->magic = KV5M_DATA;
+    if (ktp->prf_length != output->length)
+        return KRB5_CRYPTO_INTERNAL;
+    ret = ktp->prf(ktp, key, input, output);
+    return ret;
+}
+
+krb5_error_code KRB5_CALLCONV
+krb5_c_prf(krb5_context context, const krb5_keyblock *keyblock,
+           krb5_data *input, krb5_data *output)
+{
+    krb5_key key;
+    krb5_error_code ret;
+
+    ret = krb5_k_create_key(context, keyblock, &key);
+    if (ret != 0)
+        return ret;
+    ret = krb5_k_prf(context, key, input, output);
+    krb5_k_free_key(context, key);
+    return ret;
+}