1 files changed, 80 insertions, 0 deletions
diff --git a/lib/fingerprint.c b/lib/fingerprint.c
new file mode 100644
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--- /dev/null
+++ b/lib/fingerprint.c
@@ -0,0 +1,80 @@
+/*
+ * Copyright (C) 2001-2012 Free Software Foundation, Inc.
+ *
+ * Author: Nikos Mavrogiannopoulos
+ *
+ * This file is part of GnuTLS.
+ *
+ * The GnuTLS is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public License
+ * as published by the Free Software Foundation; either version 2.1 of
+ * the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>
+ *
+ */
+
+#include "gnutls_int.h"
+#include <auth/srp_kx.h>
+#include <auth/anon.h>
+#include <auth/cert.h>
+#include <auth/psk.h>
+#include "errors.h"
+#include <auth.h>
+#include <state.h>
+#include <datum.h>
+#include <algorithms.h>
+
+/**
+ * gnutls_fingerprint:
+ * @algo: is a digest algorithm
+ * @data: is the data
+ * @result: is the place where the result will be copied (may be null).
+ * @result_size: should hold the size of the result. The actual size
+ * of the returned result will also be copied there.
+ *
+ * This function will calculate a fingerprint (actually a hash), of
+ * the given data.  The result is not printable data.  You should
+ * convert it to hex, or to something else printable.
+ *
+ * This is the usual way to calculate a fingerprint of an X.509 DER
+ * encoded certificate.  Note however that the fingerprint of an
+ * OpenPGP certificate is not just a hash and cannot be calculated with this
+ * function.
+ *
+ * Returns: On success, %GNUTLS_E_SUCCESS (0) is returned, otherwise
+ *   an error code is returned.
+ **/
+int
+gnutls_fingerprint(gnutls_digest_algorithm_t algo,
+		   const gnutls_datum_t * data, void *result,
+		   size_t * result_size)
+{
+	int ret;
+	int hash_len = _gnutls_hash_get_algo_len(hash_to_entry(algo));
+
+	if (hash_len < 0 || (unsigned) hash_len > *result_size
+	    || result == NULL) {
+		*result_size = hash_len;
+		return GNUTLS_E_SHORT_MEMORY_BUFFER;
+	}
+	*result_size = hash_len;
+
+	if (result) {
+		ret =
+		    _gnutls_hash_fast(algo, data->data, data->size,
+				      result);
+		if (ret < 0)
+			return gnutls_assert_val(ret);
+	}
+
+	return 0;
+}
+
+