1 files changed, 816 insertions, 0 deletions

diff --git a/regress/cred.c b/regress/cred.c
new file mode 100644
index 0000000..4998649
--- /dev/null
+++ b/regress/cred.c
@@ -0,0 +1,816 @@
+/*
+ * Copyright (c) 2018 Yubico AB. All rights reserved.
+ * Use of this source code is governed by a BSD-style
+ * license that can be found in the LICENSE file.
+ */
+
+#include <assert.h>
+#include <fido.h>
+#include <string.h>
+
+#define FAKE_DEV_HANDLE ((void *)0xdeadbeef)
+
+static const unsigned char cdh[32] = {
+        0xf9, 0x64, 0x57, 0xe7, 0x2d, 0x97, 0xf6, 0xbb,
+        0xdd, 0xd7, 0xfb, 0x06, 0x37, 0x62, 0xea, 0x26,
+        0x20, 0x44, 0x8e, 0x69, 0x7c, 0x03, 0xf2, 0x31,
+        0x2f, 0x99, 0xdc, 0xaf, 0x3e, 0x8a, 0x91, 0x6b,
+};
+
+static const unsigned char authdata[198] = {
+        0x58, 0xc4, 0x49, 0x96, 0x0d, 0xe5, 0x88, 0x0e,
+        0x8c, 0x68, 0x74, 0x34, 0x17, 0x0f, 0x64, 0x76,
+        0x60, 0x5b, 0x8f, 0xe4, 0xae, 0xb9, 0xa2, 0x86,
+        0x32, 0xc7, 0x99, 0x5c, 0xf3, 0xba, 0x83, 0x1d,
+        0x97, 0x63, 0x41, 0x00, 0x00, 0x00, 0x00, 0xf8,
+        0xa0, 0x11, 0xf3, 0x8c, 0x0a, 0x4d, 0x15, 0x80,
+        0x06, 0x17, 0x11, 0x1f, 0x9e, 0xdc, 0x7d, 0x00,
+        0x40, 0x53, 0xfb, 0xdf, 0xaa, 0xce, 0x63, 0xde,
+        0xc5, 0xfe, 0x47, 0xe6, 0x52, 0xeb, 0xf3, 0x5d,
+        0x53, 0xa8, 0xbf, 0x9d, 0xd6, 0x09, 0x6b, 0x5e,
+        0x7f, 0xe0, 0x0d, 0x51, 0x30, 0x85, 0x6a, 0xda,
+        0x68, 0x70, 0x85, 0xb0, 0xdb, 0x08, 0x0b, 0x83,
+        0x2c, 0xef, 0x44, 0xe2, 0x36, 0x88, 0xee, 0x76,
+        0x90, 0x6e, 0x7b, 0x50, 0x3e, 0x9a, 0xa0, 0xd6,
+        0x3c, 0x34, 0xe3, 0x83, 0xe7, 0xd1, 0xbd, 0x9f,
+        0x25, 0xa5, 0x01, 0x02, 0x03, 0x26, 0x20, 0x01,
+        0x21, 0x58, 0x20, 0x17, 0x5b, 0x27, 0xa6, 0x56,
+        0xb2, 0x26, 0x0c, 0x26, 0x0c, 0x55, 0x42, 0x78,
+        0x17, 0x5d, 0x4c, 0xf8, 0xa2, 0xfd, 0x1b, 0xb9,
+        0x54, 0xdf, 0xd5, 0xeb, 0xbf, 0x22, 0x64, 0xf5,
+        0x21, 0x9a, 0xc6, 0x22, 0x58, 0x20, 0x87, 0x5f,
+        0x90, 0xe6, 0xfd, 0x71, 0x27, 0x9f, 0xeb, 0xe3,
+        0x03, 0x44, 0xbc, 0x8d, 0x49, 0xc6, 0x1c, 0x31,
+        0x3b, 0x72, 0xae, 0xd4, 0x53, 0xb1, 0xfe, 0x5d,
+        0xe1, 0x30, 0xfc, 0x2b, 0x1e, 0xd2,
+};
+
+static const unsigned char authdata_dupkeys[200] = {
+        0x58, 0xc6, 0x49, 0x96, 0x0d, 0xe5, 0x88, 0x0e,
+        0x8c, 0x68, 0x74, 0x34, 0x17, 0x0f, 0x64, 0x76,
+        0x60, 0x5b, 0x8f, 0xe4, 0xae, 0xb9, 0xa2, 0x86,
+        0x32, 0xc7, 0x99, 0x5c, 0xf3, 0xba, 0x83, 0x1d,
+        0x97, 0x63, 0x41, 0x00, 0x00, 0x00, 0x00, 0xf8,
+        0xa0, 0x11, 0xf3, 0x8c, 0x0a, 0x4d, 0x15, 0x80,
+        0x06, 0x17, 0x11, 0x1f, 0x9e, 0xdc, 0x7d, 0x00,
+        0x40, 0x53, 0xfb, 0xdf, 0xaa, 0xce, 0x63, 0xde,
+        0xc5, 0xfe, 0x47, 0xe6, 0x52, 0xeb, 0xf3, 0x5d,
+        0x53, 0xa8, 0xbf, 0x9d, 0xd6, 0x09, 0x6b, 0x5e,
+        0x7f, 0xe0, 0x0d, 0x51, 0x30, 0x85, 0x6a, 0xda,
+        0x68, 0x70, 0x85, 0xb0, 0xdb, 0x08, 0x0b, 0x83,
+        0x2c, 0xef, 0x44, 0xe2, 0x36, 0x88, 0xee, 0x76,
+        0x90, 0x6e, 0x7b, 0x50, 0x3e, 0x9a, 0xa0, 0xd6,
+        0x3c, 0x34, 0xe3, 0x83, 0xe7, 0xd1, 0xbd, 0x9f,
+        0x25, 0xa6, 0x01, 0x02, 0x01, 0x02, 0x03, 0x26,
+        0x20, 0x01, 0x21, 0x58, 0x20, 0x17, 0x5b, 0x27,
+        0xa6, 0x56, 0xb2, 0x26, 0x0c, 0x26, 0x0c, 0x55,
+        0x42, 0x78, 0x17, 0x5d, 0x4c, 0xf8, 0xa2, 0xfd,
+        0x1b, 0xb9, 0x54, 0xdf, 0xd5, 0xeb, 0xbf, 0x22,
+        0x64, 0xf5, 0x21, 0x9a, 0xc6, 0x22, 0x58, 0x20,
+        0x87, 0x5f, 0x90, 0xe6, 0xfd, 0x71, 0x27, 0x9f,
+        0xeb, 0xe3, 0x03, 0x44, 0xbc, 0x8d, 0x49, 0xc6,
+        0x1c, 0x31, 0x3b, 0x72, 0xae, 0xd4, 0x53, 0xb1,
+        0xfe, 0x5d, 0xe1, 0x30, 0xfc, 0x2b, 0x1e, 0xd2,
+};
+
+static const unsigned char authdata_unsorted_keys[198] = {
+        0x58, 0xc4, 0x49, 0x96, 0x0d, 0xe5, 0x88, 0x0e,
+        0x8c, 0x68, 0x74, 0x34, 0x17, 0x0f, 0x64, 0x76,
+        0x60, 0x5b, 0x8f, 0xe4, 0xae, 0xb9, 0xa2, 0x86,
+        0x32, 0xc7, 0x99, 0x5c, 0xf3, 0xba, 0x83, 0x1d,
+        0x97, 0x63, 0x41, 0x00, 0x00, 0x00, 0x00, 0xf8,
+        0xa0, 0x11, 0xf3, 0x8c, 0x0a, 0x4d, 0x15, 0x80,
+        0x06, 0x17, 0x11, 0x1f, 0x9e, 0xdc, 0x7d, 0x00,
+        0x40, 0x53, 0xfb, 0xdf, 0xaa, 0xce, 0x63, 0xde,
+        0xc5, 0xfe, 0x47, 0xe6, 0x52, 0xeb, 0xf3, 0x5d,
+        0x53, 0xa8, 0xbf, 0x9d, 0xd6, 0x09, 0x6b, 0x5e,
+        0x7f, 0xe0, 0x0d, 0x51, 0x30, 0x85, 0x6a, 0xda,
+        0x68, 0x70, 0x85, 0xb0, 0xdb, 0x08, 0x0b, 0x83,
+        0x2c, 0xef, 0x44, 0xe2, 0x36, 0x88, 0xee, 0x76,
+        0x90, 0x6e, 0x7b, 0x50, 0x3e, 0x9a, 0xa0, 0xd6,
+        0x3c, 0x34, 0xe3, 0x83, 0xe7, 0xd1, 0xbd, 0x9f,
+        0x25, 0xa5, 0x03, 0x26, 0x01, 0x02, 0x20, 0x01,
+        0x21, 0x58, 0x20, 0x17, 0x5b, 0x27, 0xa6, 0x56,
+        0xb2, 0x26, 0x0c, 0x26, 0x0c, 0x55, 0x42, 0x78,
+        0x17, 0x5d, 0x4c, 0xf8, 0xa2, 0xfd, 0x1b, 0xb9,
+        0x54, 0xdf, 0xd5, 0xeb, 0xbf, 0x22, 0x64, 0xf5,
+        0x21, 0x9a, 0xc6, 0x22, 0x58, 0x20, 0x87, 0x5f,
+        0x90, 0xe6, 0xfd, 0x71, 0x27, 0x9f, 0xeb, 0xe3,
+        0x03, 0x44, 0xbc, 0x8d, 0x49, 0xc6, 0x1c, 0x31,
+        0x3b, 0x72, 0xae, 0xd4, 0x53, 0xb1, 0xfe, 0x5d,
+        0xe1, 0x30, 0xfc, 0x2b, 0x1e, 0xd2,
+};
+
+static const unsigned char x509[742] = {
+        0x30, 0x82, 0x02, 0xe2, 0x30, 0x81, 0xcb, 0x02,
+        0x01, 0x01, 0x30, 0x0d, 0x06, 0x09, 0x2a, 0x86,
+        0x48, 0x86, 0xf7, 0x0d, 0x01, 0x01, 0x0b, 0x05,
+        0x00, 0x30, 0x1d, 0x31, 0x1b, 0x30, 0x19, 0x06,
+        0x03, 0x55, 0x04, 0x03, 0x13, 0x12, 0x59, 0x75,
+        0x62, 0x69, 0x63, 0x6f, 0x20, 0x55, 0x32, 0x46,
+        0x20, 0x54, 0x65, 0x73, 0x74, 0x20, 0x43, 0x41,
+        0x30, 0x1e, 0x17, 0x0d, 0x31, 0x34, 0x30, 0x35,
+        0x31, 0x35, 0x31, 0x32, 0x35, 0x38, 0x35, 0x34,
+        0x5a, 0x17, 0x0d, 0x31, 0x34, 0x30, 0x36, 0x31,
+        0x34, 0x31, 0x32, 0x35, 0x38, 0x35, 0x34, 0x5a,
+        0x30, 0x1d, 0x31, 0x1b, 0x30, 0x19, 0x06, 0x03,
+        0x55, 0x04, 0x03, 0x13, 0x12, 0x59, 0x75, 0x62,
+        0x69, 0x63, 0x6f, 0x20, 0x55, 0x32, 0x46, 0x20,
+        0x54, 0x65, 0x73, 0x74, 0x20, 0x45, 0x45, 0x30,
+        0x59, 0x30, 0x13, 0x06, 0x07, 0x2a, 0x86, 0x48,
+        0xce, 0x3d, 0x02, 0x01, 0x06, 0x08, 0x2a, 0x86,
+        0x48, 0xce, 0x3d, 0x03, 0x01, 0x07, 0x03, 0x42,
+        0x00, 0x04, 0xdb, 0x0a, 0xdb, 0xf5, 0x21, 0xc7,
+        0x5c, 0xce, 0x63, 0xdc, 0xa6, 0xe1, 0xe8, 0x25,
+        0x06, 0x0d, 0x94, 0xe6, 0x27, 0x54, 0x19, 0x4f,
+        0x9d, 0x24, 0xaf, 0x26, 0x1a, 0xbe, 0xad, 0x99,
+        0x44, 0x1f, 0x95, 0xa3, 0x71, 0x91, 0x0a, 0x3a,
+        0x20, 0xe7, 0x3e, 0x91, 0x5e, 0x13, 0xe8, 0xbe,
+        0x38, 0x05, 0x7a, 0xd5, 0x7a, 0xa3, 0x7e, 0x76,
+        0x90, 0x8f, 0xaf, 0xe2, 0x8a, 0x94, 0xb6, 0x30,
+        0xeb, 0x9d, 0x30, 0x0d, 0x06, 0x09, 0x2a, 0x86,
+        0x48, 0x86, 0xf7, 0x0d, 0x01, 0x01, 0x0b, 0x05,
+        0x00, 0x03, 0x82, 0x02, 0x01, 0x00, 0x95, 0x40,
+        0x6b, 0x50, 0x61, 0x7d, 0xad, 0x84, 0xa3, 0xb4,
+        0xeb, 0x88, 0x0f, 0xe3, 0x30, 0x0f, 0x2d, 0xa2,
+        0x0a, 0x00, 0xd9, 0x25, 0x04, 0xee, 0x72, 0xfa,
+        0x67, 0xdf, 0x58, 0x51, 0x0f, 0x0b, 0x47, 0x02,
+        0x9c, 0x3e, 0x41, 0x29, 0x4a, 0x93, 0xac, 0x29,
+        0x85, 0x89, 0x2d, 0xa4, 0x7a, 0x81, 0x32, 0x28,
+        0x57, 0x71, 0x01, 0xef, 0xa8, 0x42, 0x88, 0x16,
+        0x96, 0x37, 0x91, 0xd5, 0xdf, 0xe0, 0x8f, 0xc9,
+        0x3c, 0x8d, 0xb0, 0xcd, 0x89, 0x70, 0x82, 0xec,
+        0x79, 0xd3, 0xc6, 0x78, 0x73, 0x29, 0x32, 0xe5,
+        0xab, 0x6c, 0xbd, 0x56, 0x9f, 0xd5, 0x45, 0x91,
+        0xce, 0xc1, 0xdd, 0x8d, 0x64, 0xdc, 0xe9, 0x9c,
+        0x1f, 0x5e, 0x3c, 0xd2, 0xaf, 0x51, 0xa5, 0x82,
+        0x18, 0xaf, 0xe0, 0x37, 0xe7, 0x32, 0x9e, 0x76,
+        0x05, 0x77, 0x02, 0x7b, 0xe6, 0x24, 0xa0, 0x31,
+        0x56, 0x1b, 0xfd, 0x19, 0xc5, 0x71, 0xd3, 0xf0,
+        0x9e, 0xc0, 0x73, 0x05, 0x4e, 0xbc, 0x85, 0xb8,
+        0x53, 0x9e, 0xef, 0xc5, 0xbc, 0x9c, 0x56, 0xa3,
+        0xba, 0xd9, 0x27, 0x6a, 0xbb, 0xa9, 0x7a, 0x40,
+        0xd7, 0x47, 0x8b, 0x55, 0x72, 0x6b, 0xe3, 0xfe,
+        0x28, 0x49, 0x71, 0x24, 0xf4, 0x8f, 0xf4, 0x20,
+        0x81, 0xea, 0x38, 0xff, 0x7c, 0x0a, 0x4f, 0xdf,
+        0x02, 0x82, 0x39, 0x81, 0x82, 0x3b, 0xca, 0x09,
+        0xdd, 0xca, 0xaa, 0x0f, 0x27, 0xf5, 0xa4, 0x83,
+        0x55, 0x6c, 0x9a, 0x39, 0x9b, 0x15, 0x3a, 0x16,
+        0x63, 0xdc, 0x5b, 0xf9, 0xac, 0x5b, 0xbc, 0xf7,
+        0x9f, 0xbe, 0x0f, 0x8a, 0xa2, 0x3c, 0x31, 0x13,
+        0xa3, 0x32, 0x48, 0xca, 0x58, 0x87, 0xf8, 0x7b,
+        0xa0, 0xa1, 0x0a, 0x6a, 0x60, 0x96, 0x93, 0x5f,
+        0x5d, 0x26, 0x9e, 0x63, 0x1d, 0x09, 0xae, 0x9a,
+        0x41, 0xe5, 0xbd, 0x08, 0x47, 0xfe, 0xe5, 0x09,
+        0x9b, 0x20, 0xfd, 0x12, 0xe2, 0xe6, 0x40, 0x7f,
+        0xba, 0x4a, 0x61, 0x33, 0x66, 0x0d, 0x0e, 0x73,
+        0xdb, 0xb0, 0xd5, 0xa2, 0x9a, 0x9a, 0x17, 0x0d,
+        0x34, 0x30, 0x85, 0x6a, 0x42, 0x46, 0x9e, 0xff,
+        0x34, 0x8f, 0x5f, 0x87, 0x6c, 0x35, 0xe7, 0xa8,
+        0x4d, 0x35, 0xeb, 0xc1, 0x41, 0xaa, 0x8a, 0xd2,
+        0xda, 0x19, 0xaa, 0x79, 0xa2, 0x5f, 0x35, 0x2c,
+        0xa0, 0xfd, 0x25, 0xd3, 0xf7, 0x9d, 0x25, 0x18,
+        0x2d, 0xfa, 0xb4, 0xbc, 0xbb, 0x07, 0x34, 0x3c,
+        0x8d, 0x81, 0xbd, 0xf4, 0xe9, 0x37, 0xdb, 0x39,
+        0xe9, 0xd1, 0x45, 0x5b, 0x20, 0x41, 0x2f, 0x2d,
+        0x27, 0x22, 0xdc, 0x92, 0x74, 0x8a, 0x92, 0xd5,
+        0x83, 0xfd, 0x09, 0xfb, 0x13, 0x9b, 0xe3, 0x39,
+        0x7a, 0x6b, 0x5c, 0xfa, 0xe6, 0x76, 0x9e, 0xe0,
+        0xe4, 0xe3, 0xef, 0xad, 0xbc, 0xfd, 0x42, 0x45,
+        0x9a, 0xd4, 0x94, 0xd1, 0x7e, 0x8d, 0xa7, 0xd8,
+        0x05, 0xd5, 0xd3, 0x62, 0xcf, 0x15, 0xcf, 0x94,
+        0x7d, 0x1f, 0x5b, 0x58, 0x20, 0x44, 0x20, 0x90,
+        0x71, 0xbe, 0x66, 0xe9, 0x9a, 0xab, 0x74, 0x32,
+        0x70, 0x53, 0x1d, 0x69, 0xed, 0x87, 0x66, 0xf4,
+        0x09, 0x4f, 0xca, 0x25, 0x30, 0xc2, 0x63, 0x79,
+        0x00, 0x3c, 0xb1, 0x9b, 0x39, 0x3f, 0x00, 0xe0,
+        0xa8, 0x88, 0xef, 0x7a, 0x51, 0x5b, 0xe7, 0xbd,
+        0x49, 0x64, 0xda, 0x41, 0x7b, 0x24, 0xc3, 0x71,
+        0x22, 0xfd, 0xd1, 0xd1, 0x20, 0xb3, 0x3f, 0x97,
+        0xd3, 0x97, 0xb2, 0xaa, 0x18, 0x1c, 0x9e, 0x03,
+        0x77, 0x7b, 0x5b, 0x7e, 0xf9, 0xa3, 0xa0, 0xd6,
+        0x20, 0x81, 0x2c, 0x38, 0x8f, 0x9d, 0x25, 0xde,
+        0xe9, 0xc8, 0xf5, 0xdd, 0x6a, 0x47, 0x9c, 0x65,
+        0x04, 0x5a, 0x56, 0xe6, 0xc2, 0xeb, 0xf2, 0x02,
+        0x97, 0xe1, 0xb9, 0xd8, 0xe1, 0x24, 0x76, 0x9f,
+        0x23, 0x62, 0x39, 0x03, 0x4b, 0xc8, 0xf7, 0x34,
+        0x07, 0x49, 0xd6, 0xe7, 0x4d, 0x9a,
+};
+
+const unsigned char sig[70] = {
+        0x30, 0x44, 0x02, 0x20, 0x54, 0x92, 0x28, 0x3b,
+        0x83, 0x33, 0x47, 0x56, 0x68, 0x79, 0xb2, 0x0c,
+        0x84, 0x80, 0xcc, 0x67, 0x27, 0x8b, 0xfa, 0x48,
+        0x43, 0x0d, 0x3c, 0xb4, 0x02, 0x36, 0x87, 0x97,
+        0x3e, 0xdf, 0x2f, 0x65, 0x02, 0x20, 0x1b, 0x56,
+        0x17, 0x06, 0xe2, 0x26, 0x0f, 0x6a, 0xe9, 0xa9,
+        0x70, 0x99, 0x62, 0xeb, 0x3a, 0x04, 0x1a, 0xc4,
+        0xa7, 0x03, 0x28, 0x56, 0x7c, 0xed, 0x47, 0x08,
+        0x68, 0x73, 0x6a, 0xb6, 0x89, 0x0d,
+};
+
+const unsigned char pubkey[64] = {
+        0x17, 0x5b, 0x27, 0xa6, 0x56, 0xb2, 0x26, 0x0c,
+        0x26, 0x0c, 0x55, 0x42, 0x78, 0x17, 0x5d, 0x4c,
+        0xf8, 0xa2, 0xfd, 0x1b, 0xb9, 0x54, 0xdf, 0xd5,
+        0xeb, 0xbf, 0x22, 0x64, 0xf5, 0x21, 0x9a, 0xc6,
+        0x87, 0x5f, 0x90, 0xe6, 0xfd, 0x71, 0x27, 0x9f,
+        0xeb, 0xe3, 0x03, 0x44, 0xbc, 0x8d, 0x49, 0xc6,
+        0x1c, 0x31, 0x3b, 0x72, 0xae, 0xd4, 0x53, 0xb1,
+        0xfe, 0x5d, 0xe1, 0x30, 0xfc, 0x2b, 0x1e, 0xd2,
+};
+
+const unsigned char id[64] = {
+        0x53, 0xfb, 0xdf, 0xaa, 0xce, 0x63, 0xde, 0xc5,
+        0xfe, 0x47, 0xe6, 0x52, 0xeb, 0xf3, 0x5d, 0x53,
+        0xa8, 0xbf, 0x9d, 0xd6, 0x09, 0x6b, 0x5e, 0x7f,
+        0xe0, 0x0d, 0x51, 0x30, 0x85, 0x6a, 0xda, 0x68,
+        0x70, 0x85, 0xb0, 0xdb, 0x08, 0x0b, 0x83, 0x2c,
+        0xef, 0x44, 0xe2, 0x36, 0x88, 0xee, 0x76, 0x90,
+        0x6e, 0x7b, 0x50, 0x3e, 0x9a, 0xa0, 0xd6, 0x3c,
+        0x34, 0xe3, 0x83, 0xe7, 0xd1, 0xbd, 0x9f, 0x25,
+};
+
+const char rp_id[] = "localhost";
+const char rp_name[] = "sweet home localhost";
+
+static void *
+dummy_open(const char *path)
+{
+        (void)path;
+
+        return (FAKE_DEV_HANDLE);
+}
+
+static void
+dummy_close(void *handle)
+{
+        assert(handle == FAKE_DEV_HANDLE);
+}
+
+static int
+dummy_read(void *handle, unsigned char *buf, size_t len, int ms)
+{
+        (void)handle;
+        (void)buf;
+        (void)len;
+        (void)ms;
+
+        abort();
+        /* NOTREACHED */
+}
+
+static int
+dummy_write(void *handle, const unsigned char *buf, size_t len)
+{
+        (void)handle;
+        (void)buf;
+        (void)len;
+
+        abort();
+        /* NOTREACHED */
+}
+
+static fido_cred_t *
+alloc_cred(void)
+{
+        fido_cred_t *c;
+
+        c = fido_cred_new();
+        assert(c != NULL);
+
+        return (c);
+}
+
+static void
+free_cred(fido_cred_t *c)
+{
+        fido_cred_free(&c);
+        assert(c == NULL);
+}
+
+static fido_dev_t *
+alloc_dev(void)
+{
+        fido_dev_t *d;
+
+        d = fido_dev_new();
+        assert(d != NULL);
+
+        return (d);
+}
+
+static void
+free_dev(fido_dev_t *d)
+{
+        fido_dev_free(&d);
+        assert(d == NULL);
+}
+
+static void
+empty_cred(void)
+{
+        fido_cred_t *c;
+        fido_dev_t *d;
+        fido_dev_io_t io_f;
+
+        c = alloc_cred();
+        assert(fido_cred_authdata_len(c) == 0);
+        assert(fido_cred_authdata_ptr(c) == NULL);
+        assert(fido_cred_clientdata_hash_len(c) == 0);
+        assert(fido_cred_clientdata_hash_ptr(c) == NULL);
+        assert(fido_cred_flags(c) == 0);
+        assert(fido_cred_fmt(c) == NULL);
+        assert(fido_cred_id_len(c) == 0);
+        assert(fido_cred_id_ptr(c) == NULL);
+        assert(fido_cred_pubkey_len(c) == 0);
+        assert(fido_cred_pubkey_ptr(c) == NULL);
+        assert(fido_cred_rp_id(c) == NULL);
+        assert(fido_cred_rp_name(c) == NULL);
+        assert(fido_cred_sig_len(c) == 0);
+        assert(fido_cred_sig_ptr(c) == NULL);
+        assert(fido_cred_x5c_len(c) == 0);
+        assert(fido_cred_x5c_ptr(c) == NULL);
+        assert(fido_cred_verify(c) == FIDO_ERR_INVALID_ARGUMENT);
+
+        io_f.open = dummy_open;
+        io_f.close = dummy_close;
+        io_f.read = dummy_read;
+        io_f.write = dummy_write;
+        d = alloc_dev();
+
+        fido_dev_force_u2f(d);
+        assert(fido_dev_set_io_functions(d, &io_f) == FIDO_OK);
+        assert(fido_dev_make_cred(d, c, NULL) == FIDO_ERR_INVALID_ARGUMENT);
+        assert(fido_dev_make_cred(d, c, "") == FIDO_ERR_UNSUPPORTED_OPTION);
+        assert(fido_cred_verify(c) == FIDO_ERR_INVALID_ARGUMENT);
+
+        fido_dev_force_fido2(d);
+        assert(fido_dev_set_io_functions(d, &io_f) == FIDO_OK);
+        assert(fido_dev_make_cred(d, c, NULL) == FIDO_ERR_INVALID_ARGUMENT);
+        assert(fido_dev_make_cred(d, c, "") == FIDO_ERR_INVALID_ARGUMENT);
+        assert(fido_cred_verify(c) == FIDO_ERR_INVALID_ARGUMENT);
+
+        free_cred(c);
+        free_dev(d);
+}
+
+static void
+valid_cred(void)
+{
+        fido_cred_t *c;
+
+        c = alloc_cred();
+        assert(fido_cred_set_type(c, COSE_ES256) == FIDO_OK);
+        assert(fido_cred_set_clientdata_hash(c, cdh, sizeof(cdh)) == FIDO_OK);
+        assert(fido_cred_set_rp(c, rp_id, rp_name) == FIDO_OK);
+        assert(fido_cred_set_authdata(c, authdata, sizeof(authdata)) == FIDO_OK);
+        assert(fido_cred_set_rk(c, FIDO_OPT_FALSE) == FIDO_OK);
+        assert(fido_cred_set_uv(c, FIDO_OPT_FALSE) == FIDO_OK);
+        assert(fido_cred_set_x509(c, x509, sizeof(x509)) == FIDO_OK);
+        assert(fido_cred_set_sig(c, sig, sizeof(sig)) == FIDO_OK);
+        assert(fido_cred_set_fmt(c, "packed") == FIDO_OK);
+        assert(fido_cred_verify(c) == FIDO_OK);
+        assert(fido_cred_pubkey_len(c) == sizeof(pubkey));
+        assert(memcmp(fido_cred_pubkey_ptr(c), pubkey, sizeof(pubkey)) == 0);
+        assert(fido_cred_id_len(c) == sizeof(id));
+        assert(memcmp(fido_cred_id_ptr(c), id, sizeof(id)) == 0);
+        free_cred(c);
+}
+
+static void
+no_cdh(void)
+{
+        fido_cred_t *c;
+
+        c = alloc_cred();
+        assert(fido_cred_set_type(c, COSE_ES256) == FIDO_OK);
+        assert(fido_cred_set_rp(c, rp_id, rp_name) == FIDO_OK);
+        assert(fido_cred_set_authdata(c, authdata, sizeof(authdata)) == FIDO_OK);
+        assert(fido_cred_set_rk(c, FIDO_OPT_FALSE) == FIDO_OK);
+        assert(fido_cred_set_uv(c, FIDO_OPT_FALSE) == FIDO_OK);
+        assert(fido_cred_set_x509(c, x509, sizeof(x509)) == FIDO_OK);
+        assert(fido_cred_set_sig(c, sig, sizeof(sig)) == FIDO_OK);
+        assert(fido_cred_set_fmt(c, "packed") == FIDO_OK);
+        assert(fido_cred_verify(c) == FIDO_ERR_INVALID_ARGUMENT);
+        assert(fido_cred_pubkey_len(c) == sizeof(pubkey));
+        assert(memcmp(fido_cred_pubkey_ptr(c), pubkey, sizeof(pubkey)) == 0);
+        assert(fido_cred_id_len(c) == sizeof(id));
+        assert(memcmp(fido_cred_id_ptr(c), id, sizeof(id)) == 0);
+        free_cred(c);
+}
+
+static void
+no_rp_id(void)
+{
+        fido_cred_t *c;
+
+        c = alloc_cred();
+        assert(fido_cred_set_type(c, COSE_ES256) == FIDO_OK);
+        assert(fido_cred_set_clientdata_hash(c, cdh, sizeof(cdh)) == FIDO_OK);
+        assert(fido_cred_set_authdata(c, authdata, sizeof(authdata)) == FIDO_OK);
+        assert(fido_cred_set_rk(c, FIDO_OPT_FALSE) == FIDO_OK);
+        assert(fido_cred_set_uv(c, FIDO_OPT_FALSE) == FIDO_OK);
+        assert(fido_cred_set_x509(c, x509, sizeof(x509)) == FIDO_OK);
+        assert(fido_cred_set_sig(c, sig, sizeof(sig)) == FIDO_OK);
+        assert(fido_cred_set_fmt(c, "packed") == FIDO_OK);
+        assert(fido_cred_verify(c) == FIDO_ERR_INVALID_ARGUMENT);
+        assert(fido_cred_pubkey_len(c) == sizeof(pubkey));
+        assert(memcmp(fido_cred_pubkey_ptr(c), pubkey, sizeof(pubkey)) == 0);
+        assert(fido_cred_id_len(c) == sizeof(id));
+        assert(memcmp(fido_cred_id_ptr(c), id, sizeof(id)) == 0);
+        free_cred(c);
+}
+
+static void
+no_rp_name(void)
+{
+        fido_cred_t *c;
+
+        c = alloc_cred();
+        assert(fido_cred_set_type(c, COSE_ES256) == FIDO_OK);
+        assert(fido_cred_set_rp(c, rp_id, NULL) == FIDO_OK);
+        assert(fido_cred_set_clientdata_hash(c, cdh, sizeof(cdh)) == FIDO_OK);
+        assert(fido_cred_set_authdata(c, authdata, sizeof(authdata)) == FIDO_OK);
+        assert(fido_cred_set_rk(c, FIDO_OPT_FALSE) == FIDO_OK);
+        assert(fido_cred_set_uv(c, FIDO_OPT_FALSE) == FIDO_OK);
+        assert(fido_cred_set_x509(c, x509, sizeof(x509)) == FIDO_OK);
+        assert(fido_cred_set_sig(c, sig, sizeof(sig)) == FIDO_OK);
+        assert(fido_cred_set_fmt(c, "packed") == FIDO_OK);
+        assert(fido_cred_verify(c) == FIDO_OK);
+        assert(fido_cred_pubkey_len(c) == sizeof(pubkey));
+        assert(memcmp(fido_cred_pubkey_ptr(c), pubkey, sizeof(pubkey)) == 0);
+        assert(fido_cred_id_len(c) == sizeof(id));
+        assert(memcmp(fido_cred_id_ptr(c), id, sizeof(id)) == 0);
+        free_cred(c);
+}
+
+static void
+no_authdata(void)
+{
+        fido_cred_t *c;
+
+        c = alloc_cred();
+        assert(fido_cred_set_type(c, COSE_ES256) == FIDO_OK);
+        assert(fido_cred_set_clientdata_hash(c, cdh, sizeof(cdh)) == FIDO_OK);
+        assert(fido_cred_set_rp(c, rp_id, rp_name) == FIDO_OK);
+        assert(fido_cred_set_rk(c, FIDO_OPT_FALSE) == FIDO_OK);
+        assert(fido_cred_set_uv(c, FIDO_OPT_FALSE) == FIDO_OK);
+        assert(fido_cred_set_x509(c, x509, sizeof(x509)) == FIDO_OK);
+        assert(fido_cred_set_sig(c, sig, sizeof(sig)) == FIDO_OK);
+        assert(fido_cred_set_fmt(c, "packed") == FIDO_OK);
+        assert(fido_cred_verify(c) == FIDO_ERR_INVALID_ARGUMENT);
+        assert(fido_cred_pubkey_len(c) == 0);
+        assert(fido_cred_pubkey_ptr(c) == NULL);
+        assert(fido_cred_id_len(c) == 0);
+        assert(fido_cred_id_ptr(c) == NULL);
+        free_cred(c);
+}
+
+static void
+no_x509(void)
+{
+        fido_cred_t *c;
+
+        c = alloc_cred();
+        assert(fido_cred_set_type(c, COSE_ES256) == FIDO_OK);
+        assert(fido_cred_set_clientdata_hash(c, cdh, sizeof(cdh)) == FIDO_OK);
+        assert(fido_cred_set_rp(c, rp_id, rp_name) == FIDO_OK);
+        assert(fido_cred_set_authdata(c, authdata, sizeof(authdata)) == FIDO_OK);
+        assert(fido_cred_set_rk(c, FIDO_OPT_FALSE) == FIDO_OK);
+        assert(fido_cred_set_uv(c, FIDO_OPT_FALSE) == FIDO_OK);
+        assert(fido_cred_set_sig(c, sig, sizeof(sig)) == FIDO_OK);
+        assert(fido_cred_set_fmt(c, "packed") == FIDO_OK);
+        assert(fido_cred_verify(c) == FIDO_ERR_INVALID_ARGUMENT);
+        assert(fido_cred_pubkey_len(c) == sizeof(pubkey));
+        assert(memcmp(fido_cred_pubkey_ptr(c), pubkey, sizeof(pubkey)) == 0);
+        assert(fido_cred_id_len(c) == sizeof(id));
+        assert(memcmp(fido_cred_id_ptr(c), id, sizeof(id)) == 0);
+        free_cred(c);
+}
+
+static void
+no_sig(void)
+{
+        fido_cred_t *c;
+
+        c = alloc_cred();
+        assert(fido_cred_set_type(c, COSE_ES256) == FIDO_OK);
+        assert(fido_cred_set_clientdata_hash(c, cdh, sizeof(cdh)) == FIDO_OK);
+        assert(fido_cred_set_rp(c, rp_id, rp_name) == FIDO_OK);
+        assert(fido_cred_set_authdata(c, authdata, sizeof(authdata)) == FIDO_OK);
+        assert(fido_cred_set_rk(c, FIDO_OPT_FALSE) == FIDO_OK);
+        assert(fido_cred_set_uv(c, FIDO_OPT_FALSE) == FIDO_OK);
+        assert(fido_cred_set_x509(c, x509, sizeof(x509)) == FIDO_OK);
+        assert(fido_cred_set_fmt(c, "packed") == FIDO_OK);
+        assert(fido_cred_verify(c) == FIDO_ERR_INVALID_ARGUMENT);
+        assert(fido_cred_pubkey_len(c) == sizeof(pubkey));
+        assert(memcmp(fido_cred_pubkey_ptr(c), pubkey, sizeof(pubkey)) == 0);
+        assert(fido_cred_id_len(c) == sizeof(id));
+        assert(memcmp(fido_cred_id_ptr(c), id, sizeof(id)) == 0);
+        free_cred(c);
+}
+
+static void
+no_fmt(void)
+{
+        fido_cred_t *c;
+
+        c = alloc_cred();
+        assert(fido_cred_set_type(c, COSE_ES256) == FIDO_OK);
+        assert(fido_cred_set_clientdata_hash(c, cdh, sizeof(cdh)) == FIDO_OK);
+        assert(fido_cred_set_rp(c, rp_id, rp_name) == FIDO_OK);
+        assert(fido_cred_set_authdata(c, authdata, sizeof(authdata)) == FIDO_OK);
+        assert(fido_cred_set_rk(c, FIDO_OPT_FALSE) == FIDO_OK);
+        assert(fido_cred_set_uv(c, FIDO_OPT_FALSE) == FIDO_OK);
+        assert(fido_cred_set_x509(c, x509, sizeof(x509)) == FIDO_OK);
+        assert(fido_cred_set_sig(c, sig, sizeof(sig)) == FIDO_OK);
+        assert(fido_cred_verify(c) == FIDO_ERR_INVALID_ARGUMENT);
+        assert(fido_cred_pubkey_len(c) == sizeof(pubkey));
+        assert(memcmp(fido_cred_pubkey_ptr(c), pubkey, sizeof(pubkey)) == 0);
+        assert(fido_cred_id_len(c) == sizeof(id));
+        assert(memcmp(fido_cred_id_ptr(c), id, sizeof(id)) == 0);
+        free_cred(c);
+}
+
+static void
+wrong_options(void)
+{
+        fido_cred_t *c;
+
+        c = alloc_cred();
+        assert(fido_cred_set_type(c, COSE_ES256) == FIDO_OK);
+        assert(fido_cred_set_clientdata_hash(c, cdh, sizeof(cdh)) == FIDO_OK);
+        assert(fido_cred_set_rp(c, rp_id, rp_name) == FIDO_OK);
+        assert(fido_cred_set_authdata(c, authdata, sizeof(authdata)) == FIDO_OK);
+        assert(fido_cred_set_rk(c, FIDO_OPT_FALSE) == FIDO_OK);
+        assert(fido_cred_set_uv(c, FIDO_OPT_TRUE) == FIDO_OK);
+        assert(fido_cred_set_x509(c, x509, sizeof(x509)) == FIDO_OK);
+        assert(fido_cred_set_sig(c, sig, sizeof(sig)) == FIDO_OK);
+        assert(fido_cred_set_fmt(c, "packed") == FIDO_OK);
+        assert(fido_cred_verify(c) == FIDO_ERR_INVALID_PARAM);
+        assert(fido_cred_pubkey_len(c) == sizeof(pubkey));
+        assert(memcmp(fido_cred_pubkey_ptr(c), pubkey, sizeof(pubkey)) == 0);
+        assert(fido_cred_id_len(c) == sizeof(id));
+        assert(memcmp(fido_cred_id_ptr(c), id, sizeof(id)) == 0);
+        free_cred(c);
+}
+
+static void
+junk_cdh(void)
+{
+        fido_cred_t *c;
+        unsigned char *junk;
+
+        junk = malloc(sizeof(cdh));
+        assert(junk != NULL);
+        memcpy(junk, cdh, sizeof(cdh));
+        junk[0] = ~junk[0];
+
+        c = alloc_cred();
+        assert(fido_cred_set_type(c, COSE_ES256) == FIDO_OK);
+        assert(fido_cred_set_clientdata_hash(c, junk, sizeof(cdh)) == FIDO_OK);
+        assert(fido_cred_set_rp(c, rp_id, rp_name) == FIDO_OK);
+        assert(fido_cred_set_authdata(c, authdata, sizeof(authdata)) == FIDO_OK);
+        assert(fido_cred_set_rk(c, FIDO_OPT_FALSE) == FIDO_OK);
+        assert(fido_cred_set_uv(c, FIDO_OPT_FALSE) == FIDO_OK);
+        assert(fido_cred_set_x509(c, x509, sizeof(x509)) == FIDO_OK);
+        assert(fido_cred_set_sig(c, sig, sizeof(sig)) == FIDO_OK);
+        assert(fido_cred_set_fmt(c, "packed") == FIDO_OK);
+        assert(fido_cred_verify(c) == FIDO_ERR_INVALID_SIG);
+        assert(fido_cred_pubkey_len(c) == sizeof(pubkey));
+        assert(memcmp(fido_cred_pubkey_ptr(c), pubkey, sizeof(pubkey)) == 0);
+        assert(fido_cred_id_len(c) == sizeof(id));
+        assert(memcmp(fido_cred_id_ptr(c), id, sizeof(id)) == 0);
+        free_cred(c);
+        free(junk);
+}
+
+static void
+junk_rp_id(void)
+{
+        fido_cred_t *c;
+
+        c = alloc_cred();
+        assert(fido_cred_set_type(c, COSE_ES256) == FIDO_OK);
+        assert(fido_cred_set_clientdata_hash(c, cdh, sizeof(cdh)) == FIDO_OK);
+        assert(fido_cred_set_rp(c, "potato", rp_name) == FIDO_OK);
+        assert(fido_cred_set_authdata(c, authdata, sizeof(authdata)) == FIDO_OK);
+        assert(fido_cred_set_rk(c, FIDO_OPT_FALSE) == FIDO_OK);
+        assert(fido_cred_set_uv(c, FIDO_OPT_FALSE) == FIDO_OK);
+        assert(fido_cred_set_x509(c, x509, sizeof(x509)) == FIDO_OK);
+        assert(fido_cred_set_sig(c, sig, sizeof(sig)) == FIDO_OK);
+        assert(fido_cred_set_fmt(c, "packed") == FIDO_OK);
+        assert(fido_cred_verify(c) == FIDO_ERR_INVALID_PARAM);
+        assert(fido_cred_pubkey_len(c) == sizeof(pubkey));
+        assert(memcmp(fido_cred_pubkey_ptr(c), pubkey, sizeof(pubkey)) == 0);
+        assert(fido_cred_id_len(c) == sizeof(id));
+        assert(memcmp(fido_cred_id_ptr(c), id, sizeof(id)) == 0);
+        free_cred(c);
+}
+
+static void
+junk_rp_name(void)
+{
+        fido_cred_t *c;
+
+        c = alloc_cred();
+        assert(fido_cred_set_type(c, COSE_ES256) == FIDO_OK);
+        assert(fido_cred_set_clientdata_hash(c, cdh, sizeof(cdh)) == FIDO_OK);
+        assert(fido_cred_set_rp(c, rp_id, "potato") == FIDO_OK);
+        assert(fido_cred_set_authdata(c, authdata, sizeof(authdata)) == FIDO_OK);
+        assert(fido_cred_set_rk(c, FIDO_OPT_FALSE) == FIDO_OK);
+        assert(fido_cred_set_uv(c, FIDO_OPT_FALSE) == FIDO_OK);
+        assert(fido_cred_set_x509(c, x509, sizeof(x509)) == FIDO_OK);
+        assert(fido_cred_set_sig(c, sig, sizeof(sig)) == FIDO_OK);
+        assert(fido_cred_set_fmt(c, "packed") == FIDO_OK);
+        assert(fido_cred_verify(c) == FIDO_OK);
+        assert(fido_cred_pubkey_len(c) == sizeof(pubkey));
+        assert(memcmp(fido_cred_pubkey_ptr(c), pubkey, sizeof(pubkey)) == 0);
+        assert(fido_cred_id_len(c) == sizeof(id));
+        assert(memcmp(fido_cred_id_ptr(c), id, sizeof(id)) == 0);
+        free_cred(c);
+}
+
+static void
+junk_authdata(void)
+{
+        fido_cred_t *c;
+        unsigned char *junk;
+
+        junk = malloc(sizeof(authdata));
+        assert(junk != NULL);
+        memcpy(junk, authdata, sizeof(authdata));
+        junk[0] = ~junk[0];
+
+        c = alloc_cred();
+        assert(fido_cred_set_authdata(c, junk,
+            sizeof(authdata)) == FIDO_ERR_INVALID_ARGUMENT);
+        assert(fido_cred_authdata_len(c) == 0);
+        assert(fido_cred_authdata_ptr(c) == NULL);
+        assert(fido_cred_flags(c) == 0);
+        assert(fido_cred_fmt(c) == NULL);
+        assert(fido_cred_id_len(c) == 0);
+        assert(fido_cred_id_ptr(c) == NULL);
+        assert(fido_cred_pubkey_len(c) == 0);
+        assert(fido_cred_pubkey_ptr(c) == NULL);
+        assert(fido_cred_rp_id(c) == NULL);
+        assert(fido_cred_rp_name(c) == NULL);
+        assert(fido_cred_sig_len(c) == 0);
+        assert(fido_cred_sig_ptr(c) == NULL);
+        assert(fido_cred_x5c_len(c) == 0);
+        assert(fido_cred_x5c_ptr(c) == NULL);
+        assert(fido_cred_verify(c) == FIDO_ERR_INVALID_ARGUMENT);
+        free_cred(c);
+        free(junk);
+}
+
+static void
+junk_sig(void)
+{
+        fido_cred_t *c;
+        unsigned char *junk;
+
+        junk = malloc(sizeof(sig));
+        assert(junk != NULL);
+        memcpy(junk, sig, sizeof(sig));
+        junk[0] = ~junk[0];
+
+        c = alloc_cred();
+        assert(fido_cred_set_type(c, COSE_ES256) == FIDO_OK);
+        assert(fido_cred_set_clientdata_hash(c, cdh, sizeof(cdh)) == FIDO_OK);
+        assert(fido_cred_set_rp(c, rp_id, rp_name) == FIDO_OK);
+        assert(fido_cred_set_authdata(c, authdata, sizeof(authdata)) == FIDO_OK);
+        assert(fido_cred_set_rk(c, FIDO_OPT_FALSE) == FIDO_OK);
+        assert(fido_cred_set_uv(c, FIDO_OPT_FALSE) == FIDO_OK);
+        assert(fido_cred_set_x509(c, x509, sizeof(x509)) == FIDO_OK);
+        assert(fido_cred_set_sig(c, junk, sizeof(sig)) == FIDO_OK);
+        assert(fido_cred_set_fmt(c, "packed") == FIDO_OK);
+        assert(fido_cred_verify(c) == FIDO_ERR_INVALID_SIG);
+        assert(fido_cred_pubkey_len(c) == sizeof(pubkey));
+        assert(memcmp(fido_cred_pubkey_ptr(c), pubkey, sizeof(pubkey)) == 0);
+        assert(fido_cred_id_len(c) == sizeof(id));
+        assert(memcmp(fido_cred_id_ptr(c), id, sizeof(id)) == 0);
+        free_cred(c);
+        free(junk);
+}
+
+static void
+junk_x509(void)
+{
+        fido_cred_t *c;
+        unsigned char *junk;
+
+        junk = malloc(sizeof(x509));
+        assert(junk != NULL);
+        memcpy(junk, x509, sizeof(x509));
+        junk[0] = ~junk[0];
+
+        c = alloc_cred();
+        assert(fido_cred_set_type(c, COSE_ES256) == FIDO_OK);
+        assert(fido_cred_set_clientdata_hash(c, cdh, sizeof(cdh)) == FIDO_OK);
+        assert(fido_cred_set_rp(c, rp_id, rp_name) == FIDO_OK);
+        assert(fido_cred_set_authdata(c, authdata, sizeof(authdata)) == FIDO_OK);
+        assert(fido_cred_set_rk(c, FIDO_OPT_FALSE) == FIDO_OK);
+        assert(fido_cred_set_uv(c, FIDO_OPT_FALSE) == FIDO_OK);
+        assert(fido_cred_set_x509(c, junk, sizeof(x509)) == FIDO_OK);
+        assert(fido_cred_set_sig(c, sig, sizeof(sig)) == FIDO_OK);
+        assert(fido_cred_set_fmt(c, "packed") == FIDO_OK);
+        assert(fido_cred_verify(c) == FIDO_ERR_INVALID_SIG);
+        assert(fido_cred_pubkey_len(c) == sizeof(pubkey));
+        assert(memcmp(fido_cred_pubkey_ptr(c), pubkey, sizeof(pubkey)) == 0);
+        assert(fido_cred_id_len(c) == sizeof(id));
+        assert(memcmp(fido_cred_id_ptr(c), id, sizeof(id)) == 0);
+        free_cred(c);
+        free(junk);
+}
+
+/* github issue #6 */
+static void
+invalid_type(void)
+{
+        fido_cred_t *c;
+
+        c = alloc_cred();
+        assert(fido_cred_set_type(c, COSE_RS256) == FIDO_OK);
+        assert(fido_cred_set_clientdata_hash(c, cdh, sizeof(cdh)) == FIDO_OK);
+        assert(fido_cred_set_rp(c, rp_id, rp_name) == FIDO_OK);
+        assert(fido_cred_set_authdata(c, authdata, sizeof(authdata)) == FIDO_ERR_INVALID_ARGUMENT);
+        assert(fido_cred_set_rk(c, FIDO_OPT_FALSE) == FIDO_OK);
+        assert(fido_cred_set_uv(c, FIDO_OPT_FALSE) == FIDO_OK);
+        assert(fido_cred_set_x509(c, x509, sizeof(x509)) == FIDO_OK);
+        assert(fido_cred_set_sig(c, sig, sizeof(sig)) == FIDO_OK);
+        assert(fido_cred_set_fmt(c, "packed") == FIDO_OK);
+        assert(fido_cred_verify(c) == FIDO_ERR_INVALID_ARGUMENT);
+        assert(fido_cred_pubkey_len(c) == 0);
+        assert(fido_cred_pubkey_ptr(c) == NULL);
+        assert(fido_cred_id_len(c) == 0);
+        assert(fido_cred_id_ptr(c) == NULL);
+        free_cred(c);
+}
+
+/* cbor_serialize_alloc misuse */
+static void
+bad_cbor_serialize(void)
+{
+        fido_cred_t *c;
+
+        c = alloc_cred();
+        assert(fido_cred_set_type(c, COSE_ES256) == FIDO_OK);
+        assert(fido_cred_set_authdata(c, authdata, sizeof(authdata)) == FIDO_OK);
+        assert(fido_cred_authdata_len(c) == sizeof(authdata));
+        free_cred(c);
+}
+
+static void
+duplicate_keys(void)
+{
+        fido_cred_t *c;
+
+        c = alloc_cred();
+        assert(fido_cred_set_type(c, COSE_ES256) == FIDO_OK);
+        assert(fido_cred_set_authdata(c, authdata_dupkeys,
+            sizeof(authdata_dupkeys)) == FIDO_ERR_INVALID_ARGUMENT);
+        free_cred(c);
+}
+
+static void
+unsorted_keys(void)
+{
+        fido_cred_t *c;
+
+        c = alloc_cred();
+        assert(fido_cred_set_type(c, COSE_ES256) == FIDO_OK);
+        assert(fido_cred_set_authdata(c, authdata_unsorted_keys,
+            sizeof(authdata_unsorted_keys)) == FIDO_ERR_INVALID_ARGUMENT);
+        free_cred(c);
+}
+
+int
+main(void)
+{
+        fido_init(0);
+
+        empty_cred();
+        valid_cred();
+        no_cdh();
+        no_rp_id();
+        no_rp_name();
+        no_authdata();
+        no_x509();
+        no_sig();
+        no_fmt();
+        junk_cdh();
+        junk_rp_id();
+        junk_rp_name();
+        junk_authdata();
+        junk_x509();
+        junk_sig();
+        wrong_options();
+        invalid_type();
+        bad_cbor_serialize();
+        duplicate_keys();
+        unsorted_keys();
+
+        exit(0);
+}