1 files changed, 44 insertions, 0 deletions
diff --git a/src/libknot/sign/bnutils.c b/src/libknot/sign/bnutils.c
new file mode 100644
index 0000000..c328f44
--- /dev/null
+++ b/src/libknot/sign/bnutils.c
@@ -0,0 +1,44 @@
+/*  Copyright (C) 2011 CZ.NIC, z.s.p.o. <knot-dns@labs.nic.cz>
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program 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 General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#include <config.h>
+#include <stddef.h>
+#include <string.h>
+#include <stdlib.h>
+
+#include "sign/bnutils.h"
+#include "common/base64.h"
+
+/*!
+ * \brief Convert Base64 encoded number into OpenSSL BIGNUM format.
+ */
+BIGNUM *knot_b64_to_bignum(const char *input)
+{
+	size_t size = strlen(input);
+	uint8_t *decoded;
+	int32_t decoded_size;
+	BIGNUM *result;
+
+	decoded_size = base64_decode_alloc((uint8_t *)input, size, &decoded);
+	if (decoded_size < 0) {
+		return NULL;
+	}
+
+	result = BN_bin2bn((unsigned char *)decoded, (int)decoded_size, NULL);
+	free(decoded);
+
+	return result;
+}