diff --git a/t/assets/ed25519/cert.pem b/t/assets/ed25519/cert.pem
index 51bd991..56e0cf9 100644
--- a/t/assets/ed25519/cert.pem
+++ b/t/assets/ed25519/cert.pem
@@ -1,46 +1,3 @@
-Certificate:
-    Data:
-        Version: 3 (0x2)
-        Serial Number: 2 (0x2)
-        Signature Algorithm: sha256WithRSAEncryption
-        Issuer: CN=picotls test ca
-        Validity
-            Not Before: Mar 21 23:16:56 2021 GMT
-            Not After : Mar 19 23:16:56 2031 GMT
-        Subject: CN=ed25519.test.example.com
-        Subject Public Key Info:
-            Public Key Algorithm: ED25519
-                ED25519 Public-Key:
-                pub:
-                    ca:06:f0:64:9b:72:b2:4c:fb:c1:75:52:53:ae:d9:
-                    91:e5:5e:ff:3a:d9:49:4e:66:66:3e:0f:7b:d9:c2:
-                    ae:11
-        X509v3 extensions:
-            X509v3 Basic Constraints: 
-                CA:FALSE
-            Netscape Comment: 
-                OpenSSL Generated Certificate
-            X509v3 Subject Key Identifier: 
-                3D:85:D9:DB:34:7D:0E:92:6D:65:07:56:2B:9C:A0:89:7F:91:8F:01
-            X509v3 Authority Key Identifier: 
-                keyid:BF:79:CA:97:B2:60:78:20:96:AA:46:57:9C:DF:A7:B2:23:F5:25:63
-
-    Signature Algorithm: sha256WithRSAEncryption
-         4d:eb:fb:66:26:b7:64:3c:3c:46:43:e9:1b:1a:e8:7a:2a:56:
-         93:17:3c:b0:bd:fc:9a:02:ba:4e:a0:d5:91:1e:e0:e0:cf:23:
-         98:38:9e:d7:09:a0:a1:5b:81:9e:56:4f:b3:44:bc:42:d5:95:
-         6b:6e:7f:64:2f:92:c3:3f:da:0a:76:74:e7:74:f3:ac:8f:86:
-         66:9f:77:ab:f7:33:e5:46:06:ae:bc:60:1d:e4:3b:87:93:59:
-         f7:7d:d2:0a:87:0f:f3:ba:c0:77:30:ae:62:41:62:2c:99:2c:
-         7d:8c:51:31:fb:c4:9f:08:c7:b9:68:5a:b3:64:ed:49:1d:16:
-         91:ff:2a:ca:2f:1c:61:69:b8:6a:8c:fe:d7:69:de:83:cf:db:
-         8c:42:93:8f:11:d7:4e:8b:dd:e2:ba:7e:7c:f7:24:c8:e3:47:
-         77:52:b0:7c:d5:72:56:f4:b9:75:4a:70:ac:f2:a6:25:f7:d0:
-         fd:29:ca:bc:39:68:c5:8f:1a:ca:88:41:47:c3:4c:fc:a1:66:
-         a0:f8:cf:1b:82:a9:e3:bd:86:4e:66:59:f8:32:79:bd:98:e2:
-         6d:b0:68:ed:b9:0f:b0:bd:43:2d:dc:05:a1:27:88:88:d1:e1:
-         1e:6d:7c:43:8e:76:45:32:88:a9:5d:af:cb:dc:1f:a1:fc:39:
-         e7:1f:61:8d
 -----BEGIN CERTIFICATE-----
 MIICOTCCASGgAwIBAgIBAjANBgkqhkiG9w0BAQsFADAaMRgwFgYDVQQDEw9waWNv
 dGxzIHRlc3QgY2EwHhcNMjEwMzIxMjMxNjU2WhcNMzEwMzE5MjMxNjU2WjAjMSEw
diff --git a/t/assets/secp384r1/cert.pem b/t/assets/secp384r1/cert.pem
index 8d33af8..8c03b51 100644
--- a/t/assets/secp384r1/cert.pem
+++ b/t/assets/secp384r1/cert.pem
@@ -1,52 +1,3 @@
-Certificate:
-    Data:
-        Version: 3 (0x2)
-        Serial Number: 3 (0x3)
-        Signature Algorithm: sha256WithRSAEncryption
-        Issuer: CN=picotls test ca
-        Validity
-            Not Before: Mar 22 00:14:34 2021 GMT
-            Not After : Mar 20 00:14:34 2031 GMT
-        Subject: CN=secp384r1.test.example.com
-        Subject Public Key Info:
-            Public Key Algorithm: id-ecPublicKey
-                Public-Key: (384 bit)
-                pub:
-                    04:01:0f:f2:01:e8:b2:24:58:9b:4a:80:21:44:2c:
-                    56:19:86:d8:41:f3:f1:7e:00:b2:01:94:ff:38:c5:
-                    d6:29:83:36:3e:6d:dc:38:88:93:5f:c2:11:9f:de:
-                    04:65:bd:41:cf:8a:3c:f6:6f:0b:5b:07:51:6c:f1:
-                    59:20:9b:16:79:35:d2:0d:f6:7c:3f:86:8f:c2:1d:
-                    54:2d:2b:f5:25:4c:89:a8:62:b1:9f:80:1f:f1:c2:
-                    dc:9e:4b:a6:b8:c5:5a
-                ASN1 OID: secp384r1
-                NIST CURVE: P-384
-        X509v3 extensions:
-            X509v3 Basic Constraints: 
-                CA:FALSE
-            Netscape Comment: 
-                OpenSSL Generated Certificate
-            X509v3 Subject Key Identifier: 
-                C3:D2:A4:8C:90:23:54:D8:9F:ED:59:94:83:09:0D:D5:22:83:A0:F1
-            X509v3 Authority Key Identifier: 
-                keyid:BF:79:CA:97:B2:60:78:20:96:AA:46:57:9C:DF:A7:B2:23:F5:25:63
-
-    Signature Algorithm: sha256WithRSAEncryption
-         37:c8:be:48:a7:68:57:4e:aa:92:b9:19:0d:f8:84:4b:9d:94:
-         32:26:ba:d4:1d:4e:1f:88:69:a0:68:d7:4f:48:05:c7:80:2a:
-         04:d9:67:76:4c:c0:49:93:69:1b:20:58:ce:44:8b:a6:54:8a:
-         54:a1:00:93:52:d1:a3:ad:a0:cf:e6:18:30:64:20:a9:4c:8c:
-         ed:c2:7a:7b:7a:c3:8c:c0:65:4f:16:7a:b1:9b:3e:03:10:6c:
-         9f:6c:33:fc:2d:d5:a0:75:93:78:c6:db:21:5d:23:20:15:46:
-         3d:bb:77:16:41:43:71:58:de:d6:0c:be:b5:6f:27:87:c3:91:
-         99:3c:a7:fe:48:3f:7d:7d:03:ac:b5:8c:ce:f1:70:1e:4f:7c:
-         42:28:d8:95:98:ed:6b:17:3b:51:ac:ff:ee:cb:79:c1:6c:2e:
-         39:4c:ab:f5:c9:a2:42:6b:a8:1c:38:17:4d:49:78:ba:10:7f:
-         25:5d:6c:f4:01:20:2e:17:bf:e3:42:0f:7b:43:01:b7:d4:85:
-         2d:0e:f2:3b:c8:82:76:43:ca:8b:4b:af:1c:05:18:ef:da:7c:
-         3c:ad:30:90:fd:4b:f7:00:11:bd:99:7f:9f:6d:67:0e:80:c4:
-         08:e9:cf:2f:38:e3:d9:ff:ad:7e:99:5a:39:47:7b:c1:4a:b7:
-         af:54:e0:c5
 -----BEGIN CERTIFICATE-----
 MIIChzCCAW+gAwIBAgIBAzANBgkqhkiG9w0BAQsFADAaMRgwFgYDVQQDEw9waWNv
 dGxzIHRlc3QgY2EwHhcNMjEwMzIyMDAxNDM0WhcNMzEwMzIwMDAxNDM0WjAlMSMw
diff --git a/t/assets/secp521r1/cert.pem b/t/assets/secp521r1/cert.pem
index f9a963c..28a76c1 100644
--- a/t/assets/secp521r1/cert.pem
+++ b/t/assets/secp521r1/cert.pem
@@ -1,54 +1,3 @@
-Certificate:
-    Data:
-        Version: 3 (0x2)
-        Serial Number: 4 (0x4)
-        Signature Algorithm: sha256WithRSAEncryption
-        Issuer: CN=picotls test ca
-        Validity
-            Not Before: Mar 22 00:34:45 2021 GMT
-            Not After : Mar 20 00:34:45 2031 GMT
-        Subject: CN=secp521r1.test.example.com
-        Subject Public Key Info:
-            Public Key Algorithm: id-ecPublicKey
-                Public-Key: (521 bit)
-                pub:
-                    04:00:2c:95:0a:72:ae:8e:93:32:bf:9f:2b:f4:bf:
-                    f7:1c:bd:29:33:d3:f1:83:1f:f4:ed:ce:7f:7f:e4:
-                    82:d6:e9:2a:62:8f:25:22:e2:ee:0b:bf:27:07:79:
-                    a7:e3:00:01:f0:fb:13:f2:9c:fc:5d:06:68:60:12:
-                    39:e7:69:63:f8:70:62:00:7b:13:92:2f:58:f9:a9:
-                    b3:70:3a:39:40:29:73:a2:a3:ba:1a:d5:cd:ec:73:
-                    88:2e:ca:81:80:55:1b:95:ff:9a:bf:a9:35:f4:e5:
-                    f5:f3:95:fe:aa:73:bc:3d:bd:4a:c3:0b:e2:11:65:
-                    c3:a2:4b:b8:41:32:16:a1:08:e3:e1:51:92
-                ASN1 OID: secp521r1
-                NIST CURVE: P-521
-        X509v3 extensions:
-            X509v3 Basic Constraints: 
-                CA:FALSE
-            Netscape Comment: 
-                OpenSSL Generated Certificate
-            X509v3 Subject Key Identifier: 
-                BF:5B:DB:18:6B:81:70:CB:39:CC:47:53:18:75:8B:90:9E:66:5B:08
-            X509v3 Authority Key Identifier: 
-                keyid:BF:79:CA:97:B2:60:78:20:96:AA:46:57:9C:DF:A7:B2:23:F5:25:63
-
-    Signature Algorithm: sha256WithRSAEncryption
-         12:c1:bc:3d:8b:bb:24:bc:e0:01:ab:a1:51:15:0a:9e:aa:8a:
-         3a:49:5b:0c:d0:ed:29:3c:01:94:18:af:49:8f:50:af:a6:75:
-         7f:f8:e3:ff:0e:0b:66:ca:95:4c:9e:2e:d7:d1:06:ea:db:42:
-         32:d7:b6:7e:14:0b:ca:86:25:57:01:76:76:24:bc:a2:a7:6b:
-         e1:9a:3e:00:fc:a9:db:b3:a9:ec:89:a2:dd:e8:30:3d:e5:64:
-         eb:e0:d5:c6:60:c9:4c:a7:3a:61:69:0d:03:11:f9:61:ae:7e:
-         16:87:7f:af:10:da:08:11:d7:54:a1:5f:97:f1:3a:78:8c:5a:
-         0c:f8:a2:0c:fa:ae:17:d5:8c:1a:84:d5:77:b7:fd:c1:5f:f9:
-         56:9d:79:be:ba:5d:a1:17:1a:10:94:e7:09:49:48:e6:08:d7:
-         ee:68:64:19:17:c5:91:b0:b0:e0:0d:42:67:de:9c:3c:5f:34:
-         d7:1d:f5:98:a8:66:29:87:65:fe:b6:15:ab:47:1e:42:10:62:
-         dd:cb:86:0f:68:3e:5d:51:0a:22:c3:07:3d:e5:cb:44:2b:89:
-         9c:33:dd:8f:db:88:b4:0a:8c:d7:da:a1:19:55:18:87:26:c0:
-         e2:2e:ee:b7:1c:64:31:27:97:8d:09:d7:6d:ab:2f:0b:4c:97:
-         0f:5a:d3:eb
 -----BEGIN CERTIFICATE-----
 MIICrTCCAZWgAwIBAgIBBDANBgkqhkiG9w0BAQsFADAaMRgwFgYDVQQDEw9waWNv
 dGxzIHRlc3QgY2EwHhcNMjEwMzIyMDAzNDQ1WhcNMzEwMzIwMDAzNDQ1WjAlMSMw