1 files changed, 80 insertions, 0 deletions
diff --git a/scripts/sign.py b/scripts/sign.py
new file mode 100755
index 0000000..f407f3b
--- /dev/null
+++ b/scripts/sign.py
@@ -0,0 +1,80 @@
+#!/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():
+	from argparse import ArgumentParser
+
+	parser = ArgumentParser()
+	parser.add_argument('--key', required=True, help='Name of key file')
+	parser.add_argument('--in', required=True, dest='inf', \
+			help='Name of in file')
+	parser.add_argument('--out', required=True, help='Name of out file')
+	return parser.parse_args()
+
+def main():
+	from Crypto.Signature import PKCS1_v1_5
+	from Crypto.Hash import SHA256
+	from Crypto.PublicKey import RSA
+	import struct
+
+	args = get_args()
+
+	f = open(args.key, 'rb')
+	key = RSA.importKey(f.read())
+	f.close()
+
+	f = open(args.inf, 'rb')
+	img = f.read()
+	f.close()
+
+	signer = PKCS1_v1_5.new(key)
+	h = SHA256.new()
+
+	digest_len = h.digest_size
+	sig_len = len(signer.sign(h))
+	img_size = len(img)
+
+	magic = 0x4f545348	# SHDR_MAGIC
+	img_type = 0		# SHDR_TA
+	algo = 0x70004830	# TEE_ALG_RSASSA_PKCS1_V1_5_SHA256
+	shdr = struct.pack('<IIIIHH', \
+		magic, img_type, img_size, algo, digest_len, sig_len)
+
+	h.update(shdr)
+	h.update(img)
+	sig = signer.sign(h)
+
+	f = open(args.out, 'wb')
+	f.write(shdr)
+	f.write(h.digest())
+	f.write(sig)
+	f.write(img)
+	f.close()
+
+if __name__ == "__main__":
+	main()