Add test vectors for Crypto - ES256K - sign and verify operations
Test vectors extracted from web5-js, where they are currently being used.
README includes a link to reference implementations of the functions being tested so that other SDK implementers can re-implement in other languages.
[!NOTE]
This test vector was intentionally named ES256K and not Secp256k1 as it tests the sign and verify operations of a concrete implementation of the ECDSA algorithm with the secp256k1 curve and SHA-256 hash function.
The ES256K algorithm identifier is defined in RFC8812, which specifies the use of ECDSA with the secp256k1 curve and the SHA-256 cryptographic hash function. This provides a succinct and unambiguous identifier for this combination of signature algorithm (ECDSA), curve (secp256k1), and hash function (SHA-256). The same algorithm identifiers are used broadly across JSON Object Signing and Encryption (JOSE) standards and when working with DIDs and VCs.
There are other non-signature algorithms (e.g., ECDH, ECIES, etc.) that the secp256k1 curve can be used with and other hash functions (e.g., SHA-384 or SHA-512) that can be used with ECDSA+secp256k1. There are even other signature algorithms (e.g., Schnorr) that can use both secp256k1 and SHA-256.
This PR will:
signandverifyoperationsweb5-js, where they are currently being used.closes #84