[tor-commits] [tor/release-0.3.5] Add a test for crypto_pk_asn1_decode_private maxbits.

[nickm at torproject.org]

commit ab2e66ccdc4406a195d77b202bae21c17c634cb5
Author: Nick Mathewson <nickm at torproject.org>
Date:   Sat Mar 14 13:50:38 2020 -0400

    Add a test for crypto_pk_asn1_decode_private maxbits.
---
 src/test/test_crypto.c | 24 ++++++++++++++++++++++++
 1 file changed, 24 insertions(+)

diff --git a/src/test/test_crypto.c b/src/test/test_crypto.c
index fa79f4cc4..2373e5bf8 100644
--- a/src/test/test_crypto.c
+++ b/src/test/test_crypto.c
@@ -1492,6 +1492,29 @@ test_crypto_pk_pem_encrypted(void *arg)
 }
 
 static void
+test_crypto_pk_bad_size(void *arg)
+{
+  (void)arg;
+  crypto_pk_t *pk1 = pk_generate(0);
+  crypto_pk_t *pk2 = NULL;
+  char buf[2048];
+  int n = crypto_pk_asn1_encode_private(pk1, buf, sizeof(buf));
+  tt_int_op(n, OP_GT, 0);
+
+  /* Set the max bit count smaller: we should refuse to decode the key.*/
+  pk2 = crypto_pk_asn1_decode_private(buf, n, 1020);
+  tt_assert(! pk2);
+
+  /* Set the max bit count larger: it should decode fine. */
+  pk2 = crypto_pk_asn1_decode_private(buf, n, 2048);
+  tt_assert(pk2);
+
+ done:
+  crypto_pk_free(pk1);
+  crypto_pk_free(pk2);
+}
+
+static void
 test_crypto_pk_invalid_private_key(void *arg)
 {
   (void)arg;
@@ -3163,6 +3186,7 @@ struct testcase_t crypto_tests[] = {
   { "pk_fingerprints", test_crypto_pk_fingerprints, TT_FORK, NULL, NULL },
   { "pk_base64", test_crypto_pk_base64, TT_FORK, NULL, NULL },
   { "pk_pem_encrypted", test_crypto_pk_pem_encrypted, TT_FORK, NULL, NULL },
+  { "pk_bad_size", test_crypto_pk_bad_size, 0, NULL, NULL },
   { "pk_invalid_private_key", test_crypto_pk_invalid_private_key, 0,
     NULL, NULL },
   CRYPTO_LEGACY(digests),