Size helps implement the hash.Hash interface.

Subject retrieves claim "sub" per its type in https://tools.ietf.org/html/rfc7519#section-4.1.2

GetSigningMethod is implicitly tested inside the following two functions.

TestTimeValuesThroughJSON verifies that the time values that are set via the Set{IssuedAt,NotBefore,Expiration}() methods can actually be parsed back

UnmarshalJSON implements json.Unmarshaler for signature.

MarshalJSON implements json.Unmarshaler for rawBase64.

UnmarshalJSON implements json.Unmarshaler for Claims.

UnmarshalJSON implements json.Unmarshaler for Claims.

Validate returns any errors found while validating the provided SigningOpts. The receiver validates |have|. It'll return an error if the passed Signin

Validate validates the Claims per the claims found in https://tools.ietf.org/html/rfc7519#section-4.1

Verify implements the Verify method from SigningMethod. For this signing method, must be an *rsa.PublicKey.

Verify implements the Verify method from SigningMethod. For this verify method, key must be an *ecdsa.PublicKey.

Verify implements the Verify method from SigningMethod. For this verify method, key must be an *rsa.PublicKey.

Verify implements the Verify method from SigningMethod. For this signing method, must be a []byte.

Verify helps implement the SigningMethod interface.

VerifyCallback validates the current JWS' signature as-is. It accepts a callback function that can be used to access header parameters to lookup neede

cache marshals the protected and unprotected headers, but only if they've changed since their last cache.

h is passed to crypto.RegisterHash.