net: don't crash when processing a certificate with an unknown public key.

net/data/ssl/certificates/ecdsa_rsa_test.pem

Index: net/data/ssl/certificates/ecdsa_rsa_test.pem
diff --git a/net/data/ssl/certificates/ecdsa_rsa_test.pem b/net/data/ssl/certificates/ecdsa_rsa_test.pem
new file mode 100644
index 0000000000000000000000000000000000000000..d0c354491be96155991a40d856297bc4e9a90104
--- /dev/null
+++ b/net/data/ssl/certificates/ecdsa_rsa_test.pem
@@ -0,0 +1,49 @@
+Certificate:
+    Data:
+        Version: 3 (0x2)
+        Serial Number:
+            bf:09:cb:f2:ef:7b:cf:d0:7c:a2:98:c5:8b:10:cc:3d
+        Signature Algorithm: sha1WithRSAEncryption
+        Issuer: CN=RSA Test Root
+        Validity
+            Not Before: Jan  1 00:16:40 1970
+            Not After : Aug 23 18:58:05 2014
+        Subject: CN=test2.imperialviolet.org
+        Subject Public Key Info:
+            Public Key Algorithm: id-ecPublicKey
+            EC Public Key:
+                pub: 
+                    04:39:51:60:78:0c:0d:2f:00:c8:79:5c:3f:03:da:
+                    d9:f5:e0:0c:c1:b8:07:e6:d1:86:c7:0d:fa:8d:22:
+                    b8:d3:85:0a:98:25:d2:41:d3:6e:f3:13:be:4e:e7:
+                    55:f5:1a:0d:a7:b1:73:8d:fe:94:b3:8b:88:5a:f1:
+                    82:25:36:29:1c
+                ASN1 OID: prime256v1
+        X509v3 extensions:
+            X509v3 Key Usage: critical
+                Digital Signature, Key Encipherment
+            X509v3 Basic Constraints: critical
+                CA:TRUE
+            X509v3 Subject Alternative Name: 
+                DNS:test2.imperialviolet.org
+    Signature Algorithm: sha1WithRSAEncryption
+        2f:34:ee:2d:99:8c:84:f7:ba:56:2c:ff:c7:64:2a:8d:06:ab:
+        dd:91:41:48:f6:8f:47:a9:53:e2:a5:d5:45:79:3a:c5:36:f9:
+        6e:d3:d9:72:e0:6c:1b:7d:4d:da:a7:af:36:4a:83:3a:94:42:
+        97:3e:74:f3:58:73:3a:a6:f4:c9:66:04:b2:3f:81:97:a1:d2:
+        3b:6c:49:49:ab:d4:c8:d3:6b:0a:9a:0f:6d:58:cd:4e:6d:4d:
+        de:d8:59:21:29:26:7f:2a:0d:44:a7:40:a9:45:ba:13:e7:40:
+        8e:a7:cb:eb:4f:30:50:a3:fc:48:75:74:d1:d8:d0:9c:5d:94:
+        42:66
+-----BEGIN CERTIFICATE-----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+-----END CERTIFICATE-----