1 files changed, 48 insertions, 26 deletions
diff --git a/rsa/util.py b/rsa/util.py
index cb31c46..087caf8 100644
--- a/rsa/util.py
+++ b/rsa/util.py
@@ -24,36 +24,57 @@ def private_to_public() -> None:
     """Reads a private key and outputs the corresponding public key."""
 
     # Parse the CLI options
-    parser = OptionParser(usage='usage: %prog [options]',
-                          description='Reads a private key and outputs the '
-                                      'corresponding public key. Both private and public keys use '
-                                      'the format described in PKCS#1 v1.5')
+    parser = OptionParser(
+        usage="usage: %prog [options]",
+        description="Reads a private key and outputs the "
+        "corresponding public key. Both private and public keys use "
+        "the format described in PKCS#1 v1.5",
+    )
 
-    parser.add_option('-i', '--input', dest='infilename', type='string',
-                      help='Input filename. Reads from stdin if not specified')
-    parser.add_option('-o', '--output', dest='outfilename', type='string',
-                      help='Output filename. Writes to stdout of not specified')
+    parser.add_option(
+        "-i",
+        "--input",
+        dest="infilename",
+        type="string",
+        help="Input filename. Reads from stdin if not specified",
+    )
+    parser.add_option(
+        "-o",
+        "--output",
+        dest="outfilename",
+        type="string",
+        help="Output filename. Writes to stdout of not specified",
+    )
 
-    parser.add_option('--inform', dest='inform',
-                      help='key format of input - default PEM',
-                      choices=('PEM', 'DER'), default='PEM')
+    parser.add_option(
+        "--inform",
+        dest="inform",
+        help="key format of input - default PEM",
+        choices=("PEM", "DER"),
+        default="PEM",
+    )
 
-    parser.add_option('--outform', dest='outform',
-                      help='key format of output - default PEM',
-                      choices=('PEM', 'DER'), default='PEM')
+    parser.add_option(
+        "--outform",
+        dest="outform",
+        help="key format of output - default PEM",
+        choices=("PEM", "DER"),
+        default="PEM",
+    )
 
     (cli, cli_args) = parser.parse_args(sys.argv)
 
     # Read the input data
     if cli.infilename:
-        print('Reading private key from %s in %s format' %
-              (cli.infilename, cli.inform), file=sys.stderr)
-        with open(cli.infilename, 'rb') as infile:
+        print(
+            "Reading private key from %s in %s format" % (cli.infilename, cli.inform),
+            file=sys.stderr,
+        )
+        with open(cli.infilename, "rb") as infile:
             in_data = infile.read()
     else:
-        print('Reading private key from stdin in %s format' % cli.inform,
-              file=sys.stderr)
-        in_data = sys.stdin.read().encode('ascii')
+        print("Reading private key from stdin in %s format" % cli.inform, file=sys.stderr)
+        in_data = sys.stdin.read().encode("ascii")
 
     assert type(in_data) == bytes, type(in_data)
 
@@ -65,11 +86,12 @@ def private_to_public() -> None:
     out_data = pub_key.save_pkcs1(cli.outform)
 
     if cli.outfilename:
-        print('Writing public key to %s in %s format' %
-              (cli.outfilename, cli.outform), file=sys.stderr)
-        with open(cli.outfilename, 'wb') as outfile:
+        print(
+            "Writing public key to %s in %s format" % (cli.outfilename, cli.outform),
+            file=sys.stderr,
+        )
+        with open(cli.outfilename, "wb") as outfile:
             outfile.write(out_data)
     else:
-        print('Writing public key to stdout in %s format' % cli.outform,
-              file=sys.stderr)
-        sys.stdout.write(out_data.decode('ascii'))
+        print("Writing public key to stdout in %s format" % cli.outform, file=sys.stderr)
+        sys.stdout.write(out_data.decode("ascii"))