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PrivKey defines a secp256r1 ECDSA private key.
secret number serialized using big-endian encoding
PubKey defines a secp256r1 ECDSA public key.
Point on secp256r1 curve in a compressed representation as specified in section 4.3.6 of ANSI X9.62: https://webstore.ansi.org/standards/ascx9/ansix9621998