DER is an international standard for serializing data structures which is widely used in cryptography.
DER is an international standard for serializing data structures which is widely used in cryptography. It's somewhat like protocol buffers but less convenient. This method returns a standard DER encoding of the signature, as recognized by OpenSSL and other libraries.
Will automatically adjust the S component to be less than or equal to half the curve order, if necessary.
Will automatically adjust the S component to be less than or equal to half the curve order, if necessary. This is required because for every signature (r,s) the signature (r, -s (mod N)) is a valid signature of the same message. However, we dislike the ability to modify the bits of a Bitcoin transaction after it's been signed, as that violates various assumed invariants. Thus in future only one of those forms will be considered legal and the other will be banned.