From 8870621e1de271894efd70b034d4dcc8855d20a2 Mon Sep 17 00:00:00 2001
From: Nick Mathewson <nickm@torproject.org>
Date: Tue, 12 Sep 2006 18:05:54 +0000
Subject:  r8785@Kushana:  nickm | 2006-09-12 14:05:46 -0400  Add non-dist
 utility for weasel

svn:r8373
---
 contrib/id_to_fp.c | 50 ++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 50 insertions(+)
 create mode 100644 contrib/id_to_fp.c

(limited to 'contrib/id_to_fp.c')

diff --git a/contrib/id_to_fp.c b/contrib/id_to_fp.c
new file mode 100644
index 000000000..c8f74ff16
--- /dev/null
+++ b/contrib/id_to_fp.c
@@ -0,0 +1,50 @@
+/* Copyright 2006 Nick Mathewson; see LICENSE for licensing information */
+/* $Id$ */
+
+/* id_to_fp.c : Helper for directory authority ops.  When somebody sends us
+ * a private key, this utility converts the private key into a fingerprint
+ * so you can de-list that fingerprint.
+ */
+
+#include <openssl/rsa.h>
+#include <openssl/bio.h>
+#include <openssl/sha.h>
+#include <openssl/pem.h>
+
+#include <stdio.h>
+#include <stdlib.h>
+
+#define die(s) do { fprintf(stderr, s "\n"); return 1; } while (0)
+
+int
+main(int argc, char **argv)
+{
+  BIO *b;
+  RSA *key;
+  unsigned char *buf, *bufp;
+  int len, i;
+  unsigned char digest[20];
+
+  if (argc != 2)
+    die("I want a filename");
+  if (!(b = BIO_new_file(argv[1], "r")))
+    die("couldn't open file");
+
+  if (!(key = PEM_read_bio_RSAPrivateKey(b, NULL, NULL, NULL)))
+    die("couldn't parse key");
+
+  len = i2d_RSAPublicKey(key, NULL);
+  bufp = buf = malloc(len+1);
+  len = i2d_RSAPublicKey(key, &bufp);
+  if (len < 0)
+    die("Bizarre key");
+
+  SHA1(buf, len, digest);
+  for (i=0; i < 20; i += 2) {
+    printf("%02X%02X ", (int)digest[i], (int)digest[i+1]);
+  }
+  printf("\n");
+
+  return 0;
+}
+
-- 
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