--- a/utils/key2pub.py
+++ b/utils/key2pub.py
@@ -1,9 +1,9 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 import sys
 try:
        from M2Crypto import RSA
-except ImportError, e:
+except ImportError as e:
        sys.stderr.write('ERROR: Failed to import the "M2Crypto" module: %s\n' % e.message)
        sys.stderr.write('Please install the "M2Crypto" Python module.\n')
        sys.stderr.write('On Debian GNU/Linux the package is called "python-m2crypto".\n')
@@ -17,7 +17,7 @@ def print_bignum(output, name, val):
     for v in val:
         if not idx:
             output.write('\t')
-        output.write('0x%.2x, ' % ord(v))
+        output.write('0x%.2x, ' % v)
         idx += 1
         if idx == 8:
             idx = 0
@@ -40,7 +40,7 @@ struct key_params {
 
 static const struct key_params keys[] = {
 ''')
-    for n in xrange(n + 1):
+    for n in range(n + 1):
         output.write('	KEYS(e_%d, n_%d),\n' % (n, n))
     output.write('};\n')
 
@@ -49,7 +49,7 @@ files = sys.argv[1:-1]
 outfile = sys.argv[-1]
 
 if len(files) == 0:
-    print 'Usage: %s input-file... output-file' % (sys.argv[0], )
+    print('Usage: %s input-file... output-file' % (sys.argv[0], ))
     sys.exit(2)
 
 output = open(outfile, 'w')