// Copyright (c) 2014 The btcsuite developers
// Copyright (c) 2015-2021 The Decred developers
// Use of this source code is governed by an ISC
// license that can be found in the LICENSE file.

// TODO: change this to work with sha256

package ecdsa_test

// // This example demonstrates signing a message with a secp256k1 secret key that
// // is first parsed from raw bytes and serializing the generated signature.
// func ExampleSign() {
// 	// Decode a hex-encoded secret key.
// 	pkBytes, err := hex.Dec("22a47fa09a223f2aa079edf85a7c2d4f87" +
// 		"20ee63e502ee2869afab7de234b80c")
// 	if err != nil {
// 		fmt.Println(err)
// 		return
// 	}
// 	secKey := secp256k1.SecKeyFromBytes(pkBytes)
//
// 	// Sign a message using the secret key.
// 	message := "test message"
// 	messageHash := blake256.Sum256(by(message))
// 	signature := ecdsa.Sign(secKey, messageHash[:])
//
// 	// Serialize and display the signature.
// 	fmt.Printf("Serialized Signature: %x\n", signature.Serialize())
//
// 	// Verify the signature for the message using the public key.
// 	pubKey := secKey.Pubkey()
// 	verified := signature.Verify(messageHash[:], pubKey)
// 	fmt.Printf("Signature Verified? %v\n", verified)
//
// 	// Output:
// 	// Serialized Signature: 3045022100fcc0a8768cfbcefcf2cadd7cfb0fb18ed08dd2e2ae84bef1a474a3d351b26f0302200fc1a350b45f46fa00101391302818d748c2b22615511a3ffd5bb638bd777207
// 	// Signature Verified? true
// }

// // This example demonstrates verifying a secp256k1 signature against a public
// // key that is first parsed from raw bytes.  The signature is also parsed from
// // raw bytes.
// func ExampleSignature_Verify() {
// 	// Decode hex-encoded serialized public key.
// 	pubKeyBytes, err := hex.Dec("02a673638cb9587cb68ea08dbef685c" +
// 		"6f2d2a751a8b3c6f2a7e9a4999e6e4bfaf5")
// 	if err != nil {
// 		fmt.Println(err)
// 		return
// 	}
// 	pubKey, err := secp256k1.ParsePubKey(pubKeyBytes)
// 	if err != nil {
// 		fmt.Println(err)
// 		return
// 	}
//
// 	// Decode hex-encoded serialized signature.
// 	sigBytes, err := hex.Dec("3045022100fcc0a8768cfbcefcf2cadd7cfb0" +
// 		"fb18ed08dd2e2ae84bef1a474a3d351b26f0302200fc1a350b45f46fa0010139130" +
// 		"2818d748c2b22615511a3ffd5bb638bd777207")
// 	if err != nil {
// 		fmt.Println(err)
// 		return
// 	}
// 	signature, err := ecdsa.ParseDERSignature(sigBytes)
// 	if err != nil {
// 		fmt.Println(err)
// 		return
// 	}
//
// 	// Verify the signature for the message using the public key.
// 	message := "test message"
// 	messageHash := blake256.Sum256(by(message))
// 	verified := signature.Verify(messageHash[:], pubKey)
// 	fmt.Println("Signature Verified?", verified)
//
// 	// Output:
// 	// Signature Verified? true
// }