ConstantTimeByteCompare is a constant-time byte comparison of x and y.

ECDSAKey takes the given elliptic curve, and private key (d) byte slice and returns the private ECDSA key.

ECDSAKeyFromPoint takes the given elliptic curve and point and returns the private and public keypair.

ECDSAPublicKey takes the provide curve and (x, y) coordinates and returns *ecdsa.PublicKey.

HMACKeyDerivation provides an implementation of a NIST-800-108 of a KDF (Key Derivation Function) in Counter Mode.

VerifySignature takes the provided public key, hash, and asn1 encoded signature and returns whether the given signature is valid.