Added python keygen tool

Author: danielinux

tools/keytools/keygen.py

@@ -0,0 +1,87 @@
+#!/usr/bin/python3
+
+import sys,os
+from wolfcrypt import ciphers
+
+Cfile_Banner="/* Public-key file for wolfBoot, automatically generated. Do not edit.  */\n"+ \
+             "/*\n" + \
+             " * This file has been generated and contains the public key which is\n"+ \
+             " * used by wolfBoot to verify the updates.\n"+ \
+             " */" \
+             "\n#include <stdint.h>\n\n" + \
+             "const uint8_t ed25519_pub_key[32] = {\n" 
+
+sign="ed25519"
+
+argc = len(sys.argv)
+argv = sys.argv
+
+if (argc < 2) or (argc > 3):
+    print("Usage: %s [--ed25519 | --ecc256 ] pub_key_file.c\n" % sys.argv[0])
+    sys.exit(1)
+
+if argc == 3:
+    if argv[1] != '--ed25519' and argv[1] != '--ecc256':
+        print("Usage: %s [--ed25519 | --ecc256 ] pub_key_file.c\n" % sys.argv[0])
+        sys.exit(1)
+    sign=argv[1][2:]
+    pubkey_cfile = argv[2]
+else:
+    pubkey_cfile = argv[1]
+
+if pubkey_cfile[-2:] != '.c':
+    print("** Warning: generated public key cfile does not have a '.c' extension")
+
+key_file=sign+".der"
+
+print ("Selected cipher:      " + sign)
+print ("Output Private key:   " + key_file)
+print ("Output C file:        " + pubkey_cfile)
+
+if (sign == "ed25519"):
+    ed = ciphers.Ed25519Private.make_key(32)
+    priv,pub = ed.encode_key()
+    if os.path.exists(key_file):
+        choice = input("** Warning: key file already exist! Are you sure you want to "+
+                "generate a new key and overwrite the existing key? [Type 'Yes, I am sure!']: ")
+        if (choice != "Yes, I am sure!"):
+            print("Operation canceled.")
+            sys.exit(2)
+
+    print()
+    print("Creating file " + key_file)
+    with open(key_file, "wb") as f:
+        f.write(priv)
+        f.write(pub)
+        f.close()
+    print("Creating file " + pubkey_cfile)
+    with open(pubkey_cfile, "w") as f:
+        f.write(Cfile_Banner)
+        i = 0
+        for c in bytes(pub[0:-1]):
+            f.write("0x%02X, " % c)
+            i += 1
+            if (i % 8 == 0):
+                f.write('\n')
+        f.write("0x%02X" % pub[-1])
+        f.write("\n};\n")
+        f.write("const uint32_t ed25519_pub_key_len = 32;\n")
+        f.close()
+
+if (sign == "ecc256"):
+    ec = ciphers.EccPrivate.make_key(64)
+    priv = ec.encode_key()
+    if os.path.exists(key_file):
+        choice = input("** Warning: key file already exist! Are you sure you want to "+
+                "generate a new key and overwrite the existing key? [Type 'Yes, I am sure!']: ")
+        if (choice != "Yes, I am sure!"):
+            print("Operation canceled.")
+            sys.exit(2)
+
+    print()
+    print("Creating file " + key_file)
+    with open(key_file, "wb") as f:
+        f.write(priv)
+        f.close()
+
+

tools/keytools/test.c

@@ -0,0 +1,14 @@
+/* Public-key file for wolfBoot, automatically generated. Do not edit.  */
+/*
+ * This file has been generated and contains the public key which is
+ * used by wolfBoot to verify the updates.
+ */
+#include <stdint.h>
+
+const uint8_t ed25519_pub_key[32] = {
+0xB3, 0xAE, 0xD5, 0xEC, 0x20, 0xB0, 0x59, 0x99, 
+0x2C, 0x0D, 0x76, 0x67, 0xA7, 0x29, 0x0A, 0x6D, 
+0x34, 0xD0, 0xDA, 0xBC, 0x7B, 0xDB, 0x2C, 0x6D, 
+0x2F, 0x2A, 0xD5, 0xAE, 0xE1, 0x41, 0x02, 0x46
+};
+const uint32_t ed25519_pub_key_len = 32;