Test vectors ============ Testing the correctness of the primitives implemented in each ``cryptography`` backend requires trusted test vectors. Where possible these vectors are obtained from official sources such as `NIST`_ or `IETF`_ RFCs. When this is not possible ``cryptography`` has chosen to create a set of custom vectors using an official vector file as input to verify consistency between implemented backends. Vectors are kept in the `cryptography_vectors` package rather than within our main test suite. Sources ------- Asymmetric ciphers ~~~~~~~~~~~~~~~~~~ * RSA PKCS #1 from the RSA FTP site (ftp://ftp.rsasecurity.com/pub/pkcs/pkcs-1/ and ftp://ftp.rsa.com/pub/rsalabs/tmp/). * RSA FIPS 186-2 and PKCS1 v1.5 vulnerability test vectors from `NIST CAVP`_. * FIPS 186-2 and FIPS 186-3 DSA test vectors from `NIST CAVP`_. * FIPS 186-2 and FIPS 186-3 ECDSA test vectors from `NIST CAVP`_. * DH and ECDH and ECDH+KDF(17.4) test vectors from `NIST CAVP`_. * Ed25519 test vectors from the `Ed25519 website_`. * OpenSSL PEM RSA serialization vectors from the `OpenSSL example key`_ and `GnuTLS key parsing tests`_. * OpenSSL PEM DSA serialization vectors from the `GnuTLS example keys`_. * PKCS #8 PEM serialization vectors from * GnuTLS: `enc-rsa-pkcs8.pem`_, `enc2-rsa-pkcs8.pem`_, `unenc-rsa-pkcs8.pem`_, `pkcs12_s2k_pem.c`_. The contents of `enc2-rsa-pkcs8.pem`_ was re-encrypted using a stronger PKCS#8 cipher. * `Botan's ECC private keys`_. * `asymmetric/public/PKCS1/dsa.pub.pem`_ is a PKCS1 DSA public key from the Ruby test suite. Custom asymmetric vectors ~~~~~~~~~~~~~~~~~~~~~~~~~ .. toctree:: :maxdepth: 1 custom-vectors/secp256k1 * ``asymmetric/PEM_Serialization/ec_private_key.pem`` and ``asymmetric/DER_Serialization/ec_private_key.der`` - Contains an Elliptic Curve key generated by OpenSSL from the curve ``secp256r1``. * ``asymmetric/PEM_Serialization/ec_private_key_encrypted.pem`` and ``asymmetric/DER_Serialization/ec_private_key_encrypted.der``- Contains the same Elliptic Curve key as ``ec_private_key.pem``, except that it is encrypted with AES-128 with the password "123456". * ``asymmetric/PEM_Serialization/ec_public_key.pem`` and ``asymmetric/DER_Serialization/ec_public_key.der``- Contains the public key corresponding to ``ec_private_key.pem``, generated using OpenSSL. * ``asymmetric/PEM_Serialization/rsa_private_key.pem`` - Contains an RSA 2048 bit key generated using OpenSSL, protected by the secret "123456" with DES3 encryption. * ``asymmetric/PEM_Serialization/rsa_public_key.pem`` and ``asymmetric/DER_Serialization/rsa_public_key.der``- Contains an RSA 2048 bit public generated using OpenSSL from ``rsa_private_key.pem``. * ``asymmetric/PEM_Serialization/dsaparam.pem`` - Contains 2048-bit DSA parameters generated using OpenSSL; contains no keys. * ``asymmetric/PEM_Serialization/dsa_private_key.pem`` - Contains a DSA 2048 bit key generated using OpenSSL from the parameters in ``dsaparam.pem``, protected by the secret "123456" with DES3 encryption. * ``asymmetric/PEM_Serialization/dsa_public_key.pem`` and ``asymmetric/DER_Serialization/dsa_public_key.der`` - Contains a DSA 2048 bit key generated using OpenSSL from ``dsa_private_key.pem``. * ``asymmetric/PKCS8/unenc-dsa-pkcs8.pem`` and ``asymmetric/DER_Serialization/unenc-dsa-pkcs8.der`` - Contains a DSA 1024 bit key generated using OpenSSL. * ``asymmetric/PKCS8/unenc-dsa-pkcs8.pub.pem`` and ``asymmetric/DER_Serialization/unenc-dsa-pkcs8.pub.der`` - Contains a DSA 2048 bit public key generated using OpenSSL from ``unenc-dsa-pkcs8.pem``. * DER conversions of the `GnuTLS example keys`_ for DSA as well as the `OpenSSL example key`_ for RSA. * DER conversions of `enc-rsa-pkcs8.pem`_, `enc2-rsa-pkcs8.pem`_, and `unenc-rsa-pkcs8.pem`_. * ``asymmetric/public/PKCS1/rsa.pub.pem`` and ``asymmetric/public/PKCS1/rsa.pub.der`` are PKCS1 conversions of the public key from ``asymmetric/PKCS8/unenc-rsa-pkcs8.pem`` using PEM and DER encoding. Key exchange ~~~~~~~~~~~~ * ``vectors/cryptography_vectors/asymmetric/DH/RFC5114.txt`` contains Diffie-Hellman examples from appendix A.1, A.2 and A.3 of :rfc:`5114`. X.509 ~~~~~ * PKITS test suite from `NIST PKI Testing`_. * ``v1_cert.pem`` from the OpenSSL source tree (`testx509.pem`_). * ``ecdsa_root.pem`` - `DigiCert Global Root G3`_, a ``secp384r1`` ECDSA root certificate. * ``verisign-md2-root.pem`` - A legacy Verisign public root signed using the MD2 algorithm. This is a PEM conversion of the `root data`_ in the NSS source tree. * ``cryptography.io.pem`` - A leaf certificate issued by RapidSSL for the cryptography website. * ``rapidssl_sha256_ca_g3.pem`` - The intermediate CA that issued the ``cryptography.io.pem`` certificate. * ``wildcard_san.pem`` - A leaf certificate issued by a public CA for ``langui.sh`` that contains wildcard entries in the SAN extension. * ``san_edipartyname.der`` - A DSA certificate from a `Mozilla bug`_ containing a SAN extension with an ``ediPartyName`` general name. * ``san_x400address.der`` - A DSA certificate from a `Mozilla bug`_ containing a SAN extension with an ``x400Address`` general name. Custom X.509 Vectors ~~~~~~~~~~~~~~~~~~~~ * ``invalid_version.pem`` - Contains an RSA 2048 bit certificate with the X.509 version field set to ``0x7``. * ``post2000utctime.pem`` - Contains an RSA 2048 bit certificate with the ``notBefore`` and ``notAfter`` fields encoded as post-2000 ``UTCTime``. * ``dsa_selfsigned_ca.pem`` - Contains a DSA self-signed CA certificate generated using OpenSSL. * ``ec_no_named_curve.pem`` - Contains an ECDSA certificate that does not have an embedded OID defining the curve. * ``all_supported_names.pem`` - An RSA 2048 bit certificate generated using OpenSSL that contains a subject and issuer that have two of each supported attribute type from :rfc:`5280`. * ``unsupported_subject_name.pem`` - An RSA 2048 bit self-signed CA certificate generated using OpenSSL that contains the unsupported "initials" name. * ``utf8_common_name.pem`` - An RSA 2048 bit self-signed CA certificate generated using OpenSSL that contains a UTF8String common name with the value "We heart UTF8!™". * ``two_basic_constraints.pem`` - An RSA 2048 bit self-signed certificate containing two basic constraints extensions. * ``basic_constraints_not_critical.pem`` - An RSA 2048 bit self-signed certificate containing a basic constraints extension that is not marked as critical. * ``bc_path_length_zero.pem`` - An RSA 2048 bit self-signed certificate containing a basic constraints extension with a path length of zero. * ``unsupported_extension.pem`` - An RSA 2048 bit self-signed certificate containing an unsupported extension type. The OID was encoded as "1.2.3.4" with an ``extnValue`` of "value". * ``unsupported_extension_critical.pem`` - An RSA 2048 bit self-signed certificate containing an unsupported extension type marked critical. The OID was encoded as "1.2.3.4" with an ``extnValue`` of "value". * ``san_email_dns_ip_dirname_uri.pem`` - An RSA 2048 bit self-signed certificate containing a subject alternative name extension with the following general names: ``rfc822Name``, ``dNSName``, ``iPAddress``, ``directoryName``, and ``uniformResourceIdentifier``. * ``san_empty_hostname.pem`` - An RSA 2048 bit self-signed certificate containing a subject alternative extension with an empty ``dNSName`` general name. * ``san_other_name.pem`` - An RSA 2048 bit self-signed certificate containing a subject alternative name extension with the ``otherName`` general name. * ``san_registered_id.pem`` - An RSA 1024 bit certificate containing a subject alternative name extension with the ``registeredID`` general name. * ``all_key_usages.pem`` - An RSA 2048 bit self-signed certificate containing a key usage extension with all nine purposes set to true. * ``extended_key_usage.pem`` - An RSA 2048 bit self-signed certificate containing an extended key usage extension with eight usages. * ``san_idna_names.pem`` - An RSA 2048 bit self-signed certificate containing a subject alternative name extension with ``rfc822Name``, ``dNSName``, and ``uniformResourceIdentifier`` general names with IDNA (:rfc:`5895`) encoding. * ``san_wildcard_idna.pem`` - An RSA 2048 bit self-signed certificate containing a subject alternative name extension with a ``dNSName`` general name with a wildcard IDNA (:rfc:`5895`) domain. * ``san_idna2003_dnsname.pem`` - An RSA 2048 bit self-signed certificate containing a subject alternative name extension with an IDNA 2003 (:rfc:`3490`) ``dNSName``. * ``san_rfc822_names.pem`` - An RSA 2048 bit self-signed certificate containing a subject alternative name extension with various ``rfc822Name`` values. * ``san_rfc822_idna.pem`` - An RSA 2048 bit self-signed certificate containing a subject alternative name extension with an IDNA ``rfc822Name``. * ``san_uri_with_port.pem`` - An RSA 2048 bit self-signed certificate containing a subject alternative name extension with various ``uniformResourceIdentifier`` values. * ``san_ipaddr.pem`` - An RSA 2048 bit self-signed certificate containing a subject alternative name extension with an ``iPAddress`` value. * ``san_dirname.pem`` - An RSA 2048 bit self-signed certificate containing a subject alternative name extension with a ``directoryName`` value. * ``inhibit_any_policy_5.pem`` - An RSA 2048 bit self-signed certificate containing an inhibit any policy extension with the value 5. * ``inhibit_any_policy_negative.pem`` - An RSA 2048 bit self-signed certificate containing an inhibit any policy extension with the value -1. * ``authority_key_identifier.pem`` - An RSA 2048 bit self-signed certificate containing an authority key identifier extension with key identifier, authority certificate issuer, and authority certificate serial number fields. * ``authority_key_identifier_no_keyid.pem`` - An RSA 2048 bit self-signed certificate containing an authority key identifier extension with authority certificate issuer and authority certificate serial number fields. * ``aia_ocsp_ca_issuers.pem`` - An RSA 2048 bit self-signed certificate containing an authority information access extension with two OCSP and one CA issuers entry. * ``aia_ocsp.pem`` - An RSA 2048 bit self-signed certificate containing an authority information access extension with an OCSP entry. * ``aia_ca_issuers.pem`` - An RSA 2048 bit self-signed certificate containing an authority information access extension with a CA issuers entry. * ``cdp_empty_hostname.pem`` - An RSA 2048 bit self-signed certificate containing a CRL distribution point extension with ``fullName`` URI without a hostname. * ``cdp_fullname_reasons_crl_issuer.pem`` - An RSA 1024 bit certificate containing a CRL distribution points extension with ``fullName``, ``cRLIssuer``, and ``reasons`` data. * ``cdp_crl_issuer.pem`` - An RSA 1024 bit certificate containing a CRL distribution points extension with ``cRLIssuer`` data. * ``cdp_all_reasons.pem`` - An RSA 1024 bit certificate containing a CRL distribution points extension with all ``reasons`` bits set. * ``cdp_reason_aa_compromise.pem`` - An RSA 1024 bit certificate containing a CRL distribution points extension with the ``AACompromise`` ``reasons`` bit set. * ``nc_permitted_excluded.pem`` - An RSA 2048 bit self-signed certificate containing a name constraints extension with both permitted and excluded elements. Contains ``IPv4`` and ``IPv6`` addresses with network mask as well as ``dNSName`` with a leading period. * ``nc_permitted_excluded_2.pem`` - An RSA 2048 bit self-signed certificate containing a name constraints extension with both permitted and excluded elements. Unlike ``nc_permitted_excluded.pem``, the general names do not contain any name constraints specific values. * ``nc_permitted.pem`` - An RSA 2048 bit self-signed certificate containing a name constraints extension with permitted elements. * ``nc_permitted_2.pem`` - An RSA 2048 bit self-signed certificate containing a name constraints extension with permitted elements that do not contain any name constraints specific values. * ``nc_excluded.pem`` - An RSA 2048 bit self-signed certificate containing a name constraints extension with excluded elements. * ``nc_invalid_ip_netmask.pem`` - An RSA 2048 bit self-signed certificate containing a name constraints extension with a permitted element that has an ``IPv6`` IP and an invalid network mask. * ``nc_single_ip_netmask.pem`` - An RSA 2048 bit self-signed certificate containing a name constraints extension with a permitted element that has two IPs with ``/32`` and ``/128`` network masks. * ``cp_user_notice_with_notice_reference.pem`` - An RSA 2048 bit self-signed certificate containing a certificate policies extension with a notice reference in the user notice. * ``cp_user_notice_with_explicit_text.pem`` - An RSA 2048 bit self-signed certificate containing a certificate policies extension with explicit text and no notice reference. * ``cp_cps_uri.pem`` - An RSA 2048 bit self-signed certificate containing a certificate policies extension with a CPS URI and no user notice. * ``cp_user_notice_no_explicit_text.pem`` - An RSA 2048 bit self-signed certificate containing a certificate policies extension with a user notice with no explicit text. * ``cp_invalid.pem`` - An RSA 2048 bit self-signed certificate containing a certificate policies extension with invalid data. * ``ian_uri.pem`` - An RSA 2048 bit certificate containing an issuer alternative name extension with a ``URI`` general name. * ``ocsp_nocheck.pem`` - An RSA 2048 bit self-signed certificate containing an ``OCSPNoCheck`` extension. * ``pc_inhibit_require.pem`` - An RSA 2048 bit self-signed certificate containing a policy constraints extension with both inhibit policy mapping and require explicit policy elements. * ``pc_inhibit.pem`` - An RSA 2048 bit self-signed certificate containing a policy constraints extension with an inhibit policy mapping element. * ``pc_require.pem`` - An RSA 2048 bit self-signed certificate containing a policy constraints extension with a require explicit policy element. * ``unsupported_subject_public_key_info.pem`` - A certificate whose public key is an unknown OID (``1.3.6.1.4.1.8432.1.1.2``). Custom X.509 Request Vectors ~~~~~~~~~~~~~~~~~~~~~~~~~~~~ * ``dsa_sha1.pem`` and ``dsa_sha1.der`` - Contain a certificate request using 1024-bit DSA parameters and SHA1 generated using OpenSSL. * ``rsa_md4.pem`` and ``rsa_md4.der`` - Contain a certificate request using 2048 bit RSA and MD4 generated using OpenSSL. * ``rsa_sha1.pem`` and ``rsa_sha1.der`` - Contain a certificate request using 2048 bit RSA and SHA1 generated using OpenSSL. * ``rsa_sha256.pem`` and ``rsa_sha256.der`` - Contain a certificate request using 2048 bit RSA and SHA256 generated using OpenSSL. * ``ec_sha256.pem`` and ``ec_sha256.der`` - Contain a certificate request using EC (``secp384r1``) and SHA256 generated using OpenSSL. * ``san_rsa_sha1.pem`` and ``san_rsa_sha1.der`` - Contain a certificate request using RSA and SHA1 with a subject alternative name extension generated using OpenSSL. * ``two_basic_constraints.pem`` - A certificate signing request for a RSA 2048 bit key containing two basic constraints extensions. * ``unsupported_extension.pem`` - A certificate signing request for an RSA 2048 bit key containing containing an unsupported extension type. The OID was encoded as "1.2.3.4" with an ``extnValue`` of "value". * ``unsupported_extension_critical.pem`` - A certificate signing request for an RSA 2048 bit key containing containing an unsupported extension type marked critical. The OID was encoded as "1.2.3.4" with an ``extnValue`` of "value". * ``basic_constraints.pem`` - A certificate signing request for a RSA 2048 bit key containing a basic constraints extension marked as critical. Custom X.509 Certificate Revocation List Vectors ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ * ``crl_all_reasons.pem`` - Contains a CRL with 12 revoked certificates, whose serials match their list position. It includes one revocation without any entry extensions, 10 revocations with every supported reason code and one revocation with an unsupported, non-critical entry extension with the OID value set to "1.2.3.4". * ``crl_dup_entry_ext.pem`` - Contains a CRL with one revocation which has a duplicate entry extension. * ``crl_md2_unknown_crit_entry_ext.pem`` - Contains a CRL with one revocation which contains an unsupported critical entry extension with the OID value set to "1.2.3.4". The CRL uses an unsupported MD2 signature algorithm. * ``crl_unsupported_reason.pem`` - Contains a CRL with one revocation which has an unsupported reason code. * ``crl_inval_cert_issuer_entry_ext.pem`` - Contains a CRL with one revocation which has one entry extension for certificate issuer with an empty value. * ``crl_empty.pem`` - Contains a CRL with no revoked certificates. * ``crl_ian_aia_aki.pem`` - Contains a CRL with ``IssuerAlternativeName``, ``AuthorityInformationAccess``, ``AuthorityKeyIdentifier`` and ``CRLNumber`` extensions. Hashes ~~~~~~ * MD5 from :rfc:`1321`. * RIPEMD160 from the `RIPEMD website`_. * SHA1 from `NIST CAVP`_. * SHA2 (224, 256, 384, 512) from `NIST CAVP`_. * Whirlpool from the `Whirlpool website`_. HMAC ~~~~ * HMAC-MD5 from :rfc:`2202`. * HMAC-SHA1 from :rfc:`2202`. * HMAC-RIPEMD160 from :rfc:`2286`. * HMAC-SHA2 (224, 256, 384, 512) from :rfc:`4231`. Key derivation functions ~~~~~~~~~~~~~~~~~~~~~~~~ * HKDF (SHA1, SHA256) from :rfc:`5869`. * PBKDF2 (HMAC-SHA1) from :rfc:`6070`. * scrypt from the `draft RFC`_. * X9.63 KDF from `NIST CAVP`_. Key wrapping ~~~~~~~~~~~~ * AES key wrap (AESKW) and 3DES key wrap test vectors from `NIST CAVP`_. Recipes ~~~~~~~ * Fernet from its `specification repository`_. Symmetric ciphers ~~~~~~~~~~~~~~~~~ * AES (CBC, CFB, ECB, GCM, OFB) from `NIST CAVP`_. * AES CTR from :rfc:`3686`. * 3DES (CBC, CFB, ECB, OFB) from `NIST CAVP`_. * ARC4 (KEY-LENGTH: 40, 56, 64, 80, 128, 192, 256) from :rfc:`6229`. * ARC4 (KEY-LENGTH: 160) generated by this project. See: :doc:`/development/custom-vectors/arc4` * Blowfish (CBC, CFB, ECB, OFB) from `Bruce Schneier's vectors`_. * Camellia (ECB) from NTT's `Camellia page`_ as linked by `CRYPTREC`_. * Camellia (CBC, CFB, OFB) from `OpenSSL's test vectors`_. * CAST5 (ECB) from :rfc:`2144`. * CAST5 (CBC, CFB, OFB) generated by this project. See: :doc:`/development/custom-vectors/cast5` * IDEA (ECB) from the `NESSIE IDEA vectors`_ created by `NESSIE`_. * IDEA (CBC, CFB, OFB) generated by this project. See: :doc:`/development/custom-vectors/idea` * SEED (ECB) from :rfc:`4269`. * SEED (CBC) from :rfc:`4196`. * SEED (CFB, OFB) generated by this project. See: :doc:`/development/custom-vectors/seed` Two factor authentication ~~~~~~~~~~~~~~~~~~~~~~~~~ * HOTP from :rfc:`4226` * TOTP from :rfc:`6238` (Note that an `errata`_ for the test vectors in RFC 6238 exists) CMAC ~~~~ * AES-128, AES-192, AES-256, 3DES from `NIST SP-800-38B`_ Creating test vectors --------------------- When official vectors are unavailable ``cryptography`` may choose to build its own using existing vectors as source material. Custom Symmetric Vectors ~~~~~~~~~~~~~~~~~~~~~~~~ .. toctree:: :maxdepth: 1 custom-vectors/arc4 custom-vectors/cast5 custom-vectors/idea custom-vectors/seed If official test vectors appear in the future the custom generated vectors should be discarded. Any vectors generated by this method must also be prefixed with the following header format (substituting the correct information): .. code-block:: python # CAST5 CBC vectors built for https://github.com/pyca/cryptography # Derived from the AESVS MMT test data for CBC # Verified against the CommonCrypto and Go crypto packages # Key Length : 128 .. _`NIST`: http://www.nist.gov/ .. _`IETF`: https://www.ietf.org/ .. _`NIST CAVP`: http://csrc.nist.gov/groups/STM/cavp/ .. _`Bruce Schneier's vectors`: https://www.schneier.com/code/vectors.txt .. _`Camellia page`: https://info.isl.ntt.co.jp/crypt/eng/camellia/ .. _`CRYPTREC`: http://www.cryptrec.go.jp .. _`OpenSSL's test vectors`: https://github.com/openssl/openssl/blob/97cf1f6c2854a3a955fd7dd3a1f113deba00c9ef/crypto/evp/evptests.txt#L232 .. _`RIPEMD website`: http://homes.esat.kuleuven.be/~bosselae/ripemd160.html .. _`Whirlpool website`: http://www.larc.usp.br/~pbarreto/WhirlpoolPage.html .. _`draft RFC`: https://tools.ietf.org/html/draft-josefsson-scrypt-kdf-01 .. _`Specification repository`: https://github.com/fernet/spec .. _`errata`: https://www.rfc-editor.org/errata_search.php?rfc=6238 .. _`OpenSSL example key`: https://github.com/openssl/openssl/blob/d02b48c63a58ea4367a0e905979f140b7d090f86/test/testrsa.pem .. _`GnuTLS key parsing tests`: https://gitlab.com/gnutls/gnutls/commit/f16ef39ef0303b02d7fa590a37820440c466ce8d .. _`enc-rsa-pkcs8.pem`: https://gitlab.com/gnutls/gnutls/blob/f8d943b38bf74eaaa11d396112daf43cb8aa82ae/tests/pkcs8-decode/encpkcs8.pem .. _`enc2-rsa-pkcs8.pem`: https://gitlab.com/gnutls/gnutls/blob/f8d943b38bf74eaaa11d396112daf43cb8aa82ae/tests/pkcs8-decode/enc2pkcs8.pem .. _`unenc-rsa-pkcs8.pem`: https://gitlab.com/gnutls/gnutls/blob/f8d943b38bf74eaaa11d396112daf43cb8aa82ae/tests/pkcs8-decode/unencpkcs8.pem .. _`pkcs12_s2k_pem.c`: https://gitlab.com/gnutls/gnutls/blob/f8d943b38bf74eaaa11d396112daf43cb8aa82ae/tests/pkcs12_s2k_pem.c .. _`Botan's ECC private keys`: https://github.com/randombit/botan/tree/4917f26a2b154e841cd27c1bcecdd41d2bdeb6ce/src/tests/data/ecc .. _`GnuTLS example keys`: https://gitlab.com/gnutls/gnutls/commit/ad2061deafdd7db78fd405f9d143b0a7c579da7b .. _`NESSIE IDEA vectors`: https://www.cosic.esat.kuleuven.be/nessie/testvectors/bc/idea/Idea-128-64.verified.test-vectors .. _`NESSIE`: https://en.wikipedia.org/wiki/NESSIE .. _`Ed25519 website`: http://ed25519.cr.yp.to/software.html .. _`NIST SP-800-38B`: http://csrc.nist.gov/publications/nistpubs/800-38B/Updated_CMAC_Examples.pdf .. _`NIST PKI Testing`: http://csrc.nist.gov/groups/ST/crypto_apps_infra/pki/pkitesting.html .. _`testx509.pem`: https://github.com/openssl/openssl/blob/master/test/testx509.pem .. _`DigiCert Global Root G3`: http://cacerts.digicert.com/DigiCertGlobalRootG3.crt .. _`root data`: https://hg.mozilla.org/projects/nss/file/25b2922cc564/security/nss/lib/ckfw/builtins/certdata.txt#l2053 .. _`asymmetric/public/PKCS1/dsa.pub.pem`: https://github.com/ruby/ruby/blob/4ccb387f3bc436a08fc6d72c4931994f5de95110/test/openssl/test_pkey_dsa.rb#L53 .. _`Mozilla bug`: https://bugzilla.mozilla.org/show_bug.cgi?id=233586