89 lines
2.5 KiB
Go
89 lines
2.5 KiB
Go
// Copyright (c) 2014 Conformal Systems LLC.
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// Use of this source code is governed by an ISC
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// license that can be found in the LICENSE file.
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package btcec_test
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import (
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"encoding/hex"
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"fmt"
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"github.com/btcsuite/btcwire"
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"github.com/conformal/btcec"
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)
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// This example demonstrates signing a message with a secp256k1 private key that
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// is first parsed form raw bytes and serializing the generated signature.
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func Example_signMessage() {
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// Decode a hex-encoded private key.
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pkBytes, err := hex.DecodeString("22a47fa09a223f2aa079edf85a7c2d4f87" +
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"20ee63e502ee2869afab7de234b80c")
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if err != nil {
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fmt.Println(err)
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return
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}
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privKey, pubKey := btcec.PrivKeyFromBytes(btcec.S256(), pkBytes)
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// Sign a message using the private key.
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message := "test message"
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messageHash := btcwire.DoubleSha256([]byte(message))
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signature, err := privKey.Sign(messageHash)
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if err != nil {
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fmt.Println(err)
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return
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}
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// Serialize and display the signature.
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//
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// NOTE: This is commented out for the example since the signature
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// produced uses random numbers and therefore will always be different.
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//fmt.Printf("Serialized Signature: %x\n", signature.Serialize())
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// Verify the signature for the message using the public key.
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verified := signature.Verify(messageHash, pubKey)
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fmt.Printf("Signature Verified? %v\n", verified)
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// Output:
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// Signature Verified? true
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}
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// This example demonstrates verifying a secp256k1 signature against a public
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// key that is first parsed from raw bytes. The signature is also parsed from
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// raw bytes.
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func Example_verifySignature() {
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// Decode hex-encoded serialized public key.
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pubKeyBytes, err := hex.DecodeString("02a673638cb9587cb68ea08dbef685c" +
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"6f2d2a751a8b3c6f2a7e9a4999e6e4bfaf5")
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if err != nil {
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fmt.Println(err)
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return
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}
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pubKey, err := btcec.ParsePubKey(pubKeyBytes, btcec.S256())
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if err != nil {
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fmt.Println(err)
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return
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}
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// Decode hex-encoded serialized signature.
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sigBytes, err := hex.DecodeString("30450220090ebfb3690a0ff115bb1b38b" +
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"8b323a667b7653454f1bccb06d4bbdca42c2079022100ec95778b51e707" +
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"1cb1205f8bde9af6592fc978b0452dafe599481c46d6b2e479")
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if err != nil {
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fmt.Println(err)
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return
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}
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signature, err := btcec.ParseSignature(sigBytes, btcec.S256())
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if err != nil {
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fmt.Println(err)
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return
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}
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// Verify the signature for the message using the public key.
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message := "test message"
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messageHash := btcwire.DoubleSha256([]byte(message))
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verified := signature.Verify(messageHash, pubKey)
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fmt.Println("Signature Verified?", verified)
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// Output:
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// Signature Verified? true
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}
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