From febb2251cac30594cf81965bd38714a1abfd8d76 Mon Sep 17 00:00:00 2001
From: Nick Mathewson <nickm@torproject.org>
Date: Fri, 26 Sep 2003 20:41:23 +0000
Subject: Add code to parse fingerprint files and compare routers against
 fingerprint files.

svn:r490
---
 src/common/crypto.c | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

(limited to 'src/common/crypto.c')

diff --git a/src/common/crypto.c b/src/common/crypto.c
index cf209451a1..fa1bf2b734 100644
--- a/src/common/crypto.c
+++ b/src/common/crypto.c
@@ -677,11 +677,27 @@ crypto_pk_get_fingerprint(crypto_pk_env_t *pk, char *fp_out)
   }
   *bufp = '\0';
   assert(strlen(buf) == FINGERPRINT_LEN);
+  assert(crypto_pk_check_fingerprint_syntax(buf));
   strcpy(fp_out, buf);
   free(buf);
   return 0;
 }
 
+int 
+crypto_pk_check_fingerprint_syntax(const char *s)
+{
+  int i;
+  for (i = 0; i < FINGERPRINT_LEN; ++i) {
+    if ((i%5) == 4) {
+      if (!isspace(s[i])) return 0;
+    } else {
+      if (!isxdigit(s[i])) return 0;
+    }
+  }
+  if (s[FINGERPRINT_LEN]) return 0;
+  return 1;
+}
+
 /* symmetric crypto */
 int crypto_cipher_generate_key(crypto_cipher_env_t *env)
 {
-- 
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