1 files changed, 79 insertions, 0 deletions
diff --git a/scripts/pem_to_pub_c.py b/scripts/pem_to_pub_c.py
new file mode 100755
index 0000000..47c004d
--- /dev/null
+++ b/scripts/pem_to_pub_c.py
@@ -0,0 +1,79 @@
+#!/usr/bin/env python
+#
+# Copyright (c) 2015, Linaro Limited
+# All rights reserved.
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions are met:
+#
+# 1. Redistributions of source code must retain the above copyright notice,
+# this list of conditions and the following disclaimer.
+#
+# 2. Redistributions in binary form must reproduce the above copyright notice,
+# this list of conditions and the following disclaimer in the documentation
+# and/or other materials provided with the distribution.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+# ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+# LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+# CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+# SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+# INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+# CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+# ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+# POSSIBILITY OF SUCH DAMAGE.
+#
+
+def get_args():
+	import argparse
+
+	parser = argparse.ArgumentParser()
+	parser.add_argument('--prefix', required=True, \
+		help='Prefix for the public key exponent and modulus in c file')
+
+	parser.add_argument('--out', required=True, \
+		help='Name of c file for the public key')
+
+	parser.add_argument('--key', required=True, help='Name of key file')
+
+	return parser.parse_args()
+
+def main():
+	import array
+	from Crypto.PublicKey import RSA
+	from Crypto.Util.number import long_to_bytes
+
+	args = get_args();
+
+	f = open(args.key, 'r')
+	key = RSA.importKey(f.read())
+	f.close
+
+	f = open(args.out, 'w')
+
+	f.write("#include <stdint.h>\n");
+	f.write("#include <stddef.h>\n\n");
+
+	f.write("const uint32_t " + args.prefix + "_exponent = " +
+		str(key.publickey().e) + ";\n\n")
+
+	f.write("const uint8_t " + args.prefix + "_modulus[] = {\n")
+	i = 0;
+	for x in array.array("B", long_to_bytes(key.publickey().n)):
+		f.write("0x" + '{0:02x}'.format(x) + ",")
+		i = i + 1;
+		if i % 8 == 0:
+			f.write("\n");
+		else:
+			f.write(" ");
+	f.write("};\n");
+
+	f.write("const size_t " + args.prefix + "_modulus_size = sizeof(" + \
+		args.prefix + "_modulus);\n")
+
+	f.close()
+
+if __name__ == "__main__":
+	main()