1 files changed, 73 insertions, 0 deletions
diff --git a/external/nettle-3.3/nettle/pkcs1.c b/external/nettle-3.3/nettle/pkcs1.c
new file mode 100644
index 0000000..87a2d2e
--- /dev/null
+++ b/external/nettle-3.3/nettle/pkcs1.c
@@ -0,0 +1,73 @@
+/* pkcs1.c
+
+   PKCS1 embedding.
+
+   Copyright (C) 2003 Niels Möller
+
+   This file is part of GNU Nettle.
+
+   GNU Nettle is free software: you can redistribute it and/or
+   modify it under the terms of either:
+
+     * the GNU Lesser General Public License as published by the Free
+       Software Foundation; either version 3 of the License, or (at your
+       option) any later version.
+
+   or
+
+     * 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.
+
+   or both in parallel, as here.
+
+   GNU Nettle 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 copies of the GNU General Public License and
+   the GNU Lesser General Public License along with this program.  If
+   not, see http://www.gnu.org/licenses/.
+*/
+
+#if HAVE_CONFIG_H
+# include "config.h"
+#endif
+
+#include <assert.h>
+#include <string.h>
+
+#include "pkcs1.h"
+
+/* Formats the PKCS#1 padding, of the form
+ *
+ *   0x00 0x01 0xff ... 0xff 0x00 id ...digest...
+ *
+ * where the 0xff ... 0xff part consists of at least 8 octets. The 
+ * total size equals the octet size of n.
+ */
+uint8_t *
+_pkcs1_signature_prefix(unsigned key_size,
+			uint8_t *buffer,
+			unsigned id_size,
+			const uint8_t *id,
+			unsigned digest_size)
+{
+  unsigned j;
+  
+  if (key_size < 11 + id_size + digest_size)
+    return NULL;
+
+  j = key_size - digest_size - id_size;
+
+  memcpy (buffer + j, id, id_size);
+  buffer[0] = 0;
+  buffer[1] = 1;
+  buffer[j-1] = 0;
+
+  assert(j >= 11);
+  memset(buffer + 2, 0xff, j - 3);
+
+  return buffer + j + id_size;
+}