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General BLAKE2 signature rsa ecdsa eddsa This document describes the conventions for using the BLAKE2b-512 hash function with each of the following signature algorithms: RSA Public-Key Cryptography Standards #1 version 1.5 (RSA PKCS#1 v1.5), RSA Probabilistic Signature Scheme (RSASSA-PSS), RSA Encryption Scheme - Optimal Asymmetric Encryption Padding (RSAES-OAEP), Elliptic Curve Digital Signature Algorithm (ECDSA), and Edwards-curve Digital Signature Algorithm (EdDSA). This specification applies to the Internet X.509 Public Key Infrastructure (PKI) when digital signatures are used to sign certificates and certificate revocation lists (CRLs). This document also specifies the object identifiers (OIDs) for the combinations of the BLAKE2b-512 hash function with the aforementioned signature algorithms.

The SHA-2 family of hash functions is currently the only secure and widely supported option for digital signatures in the PKIX ecosystem. While there is no reason to be seriously concerned about the security of SHA-2, which is still acceptable according to NIST SP 800-131A rev. 1, numerous previous hash functions have eventually suffered from collision attacks and needed to be replaced. Since it takes a very long time to establish support for new primitives in the PKIX ecosystem, it seems prudent to have an alternative prepared. This document specifies object identifiers (OIDs) to identify the combination of BLAKE2b-512 with each of RSA PKCS#1 v1.5, RSASSA-PSS, RSAES-OAEP, ECDSA, and EdDSA. The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this document are to be interpreted as described in .

This section describes the signature algorithms and corresponding OIDs, which may be used in conjunction with the BLAKE2b-512 hash function. The OIDs will be assigned under the following OID arc, which is based on the OID tree from .

specifies the RSA PKCS #1 v1.5 signature algorithm. This section specifies a single OID to identify the combination of BLAKE2b-512 with RSA PKCS#1 v1.5.

specifies the RSASSA-PSS signature algorithm. This section specifies a single OID to identify the combination of BLAKE2b-512 with RSASSA-PSS.

specifies the RSAES-OAEP signature algorithm. This section specifies a single OID to identify the combination of BLAKE2b-512 with RSAES-OAEP.

NIST FIPS PUB 186-4 specifies the ECDSA signature algorithm. This section specifies a single OID to identify the combination of BLAKE2b-512 with ECDSA.

specifies the EdDSA signature algorithm. This section specifies two OIDs to identify the combination of BLAKE2b-512 with the edwards25519 and edwards448 curves.

None

The authors would like to thank the designers for answering our questions about BLAKE2 and allowing us to use their object identifier space. In particular, our email exchanges with Jean-Philippe Aumasson were very helpful.

&RFC2119; &RFC2313; &RFC4055; &RFC7693; &RFC8032; National Institute of Standards and Technology