isSNormalized returns true for the integer sigS if sigS falls in lower half of the curve order It is expected that the caller passes the curve order as a big Int along with the s portion of the signature.

NormalizeS will invert the s value if not already in the lower half of curve order value by subtracting it from the curve order (N).

signatureRaw takes two big integers and returns a byte value that is the result of concatenating the byte values of each of the given integers.

unmarshalDER takes a DER-encoded byte array, and dumps it into a (hopefully-appropriate) struct.

dsaSignature contains the two integers needed for an ECDSA signature value.

Options struct contains anything that is needed for configuring a plugin with one element initially, a path to a configuration, which can be interpreted differently by an individual plugin.

Plugin interface specifies the methods required for implementation by a plugin.