Decode JWT specific base64url encoding with padding stripped.

enclose the msg with eth message for sign.

Encode JWT specific base64url encoding with padding stripped.

get pubkey bytes from privatekey string.

data to hash.

Decode decodes a hex string with 0x prefix.

sign on data hash.

Implements the Sign method from SigningMethod for this signing method.

signature to address(hex string).

verify signature with Pubkey.

Verify the signature of HS256 tokens.