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secp256k1: Use blake256 directly in examples.

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This modifies the ecdsa and schnorr examples to call blake256 directly
instead of indirecting through chainhash in order to avoid the chainhash
dependency which is otherwise not needed.

The go.mod and go.sum files are updated accordingly to remove the
no longer required dependency.
This commit is contained in:
Dave Collins 2021-08-04 03:52:55 -05:00
parent af1d6d9990
commit a1ce2e116f
No known key found for this signature in database
GPG Key ID: B8904D9D9C93D1F2
4 changed files with 15 additions and 20 deletions
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14
dcrec/secp256k1/ecdsa/example_test.go
View File

@ -1,5 +1,5 @@
// Copyright (c) 2014 The btcsuite developers
// Copyright (c) 2015-2020 The Decred 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.
@ -9,7 +9,7 @@ import (
"encoding/hex"
"fmt"
"github.com/decred/dcrd/chaincfg/chainhash"
"github.com/decred/dcrd/crypto/blake256"
"github.com/decred/dcrd/dcrec/secp256k1/v4"
"github.com/decred/dcrd/dcrec/secp256k1/v4/ecdsa"
)
@ -28,15 +28,15 @@ func ExampleSign() {
// Sign a message using the private key.
message := "test message"
messageHash := chainhash.HashB([]byte(message))
signature := ecdsa.Sign(privKey, messageHash)
messageHash := blake256.Sum256([]byte(message))
signature := ecdsa.Sign(privKey, 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 := privKey.PubKey()
verified := signature.Verify(messageHash, pubKey)
verified := signature.Verify(messageHash[:], pubKey)
fmt.Printf("Signature Verified? %v\n", verified)
// Output:
@ -77,8 +77,8 @@ func ExampleSignature_Verify() {
// Verify the signature for the message using the public key.
message := "test message"
messageHash := chainhash.HashB([]byte(message))
verified := signature.Verify(messageHash, pubKey)
messageHash := blake256.Sum256([]byte(message))
verified := signature.Verify(messageHash[:], pubKey)
fmt.Println("Signature Verified?", verified)
// Output:

5
dcrec/secp256k1/go.mod
View File

@ -2,7 +2,4 @@ module github.com/decred/dcrd/dcrec/secp256k1/v4
go 1.13
require (
github.com/decred/dcrd/chaincfg/chainhash v1.0.2
github.com/decred/dcrd/crypto/blake256 v1.0.0
)
require github.com/decred/dcrd/crypto/blake256 v1.0.0

2
dcrec/secp256k1/go.sum
View File

@ -1,4 +1,2 @@
github.com/decred/dcrd/chaincfg/chainhash v1.0.2 h1:rt5Vlq/jM3ZawwiacWjPa+smINyLRN07EO0cNBV6DGU=
github.com/decred/dcrd/chaincfg/chainhash v1.0.2/go.mod h1:BpbrGgrPTr3YJYRN3Bm+D9NuaFd+zGyNeIKgrhCXK60=
github.com/decred/dcrd/crypto/blake256 v1.0.0 h1:/8DMNYp9SGi5f0w7uCm6d6M4OU2rGFK09Y2A4Xv7EE0=
github.com/decred/dcrd/crypto/blake256 v1.0.0/go.mod h1:sQl2p6Y26YV+ZOcSTP6thNdn47hh8kt6rqSlvmrXFAc=

14
dcrec/secp256k1/schnorr/example_test.go
View File

@ -1,4 +1,4 @@
// Copyright (c) 2020 The Decred developers
// Copyright (c) 2020-2021 The Decred developers
// Use of this source code is governed by an ISC
// license that can be found in the LICENSE file.
@ -8,7 +8,7 @@ import (
"encoding/hex"
"fmt"
"github.com/decred/dcrd/chaincfg/chainhash"
"github.com/decred/dcrd/crypto/blake256"
"github.com/decred/dcrd/dcrec/secp256k1/v4"
"github.com/decred/dcrd/dcrec/secp256k1/v4/schnorr"
)
@ -28,8 +28,8 @@ func ExampleSign() {
// Sign a message using the private key.
message := "test message"
messageHash := chainhash.HashB([]byte(message))
signature, err := schnorr.Sign(privKey, messageHash)
messageHash := blake256.Sum256([]byte(message))
signature, err := schnorr.Sign(privKey, messageHash[:])
if err != nil {
fmt.Println(err)
return
@ -40,7 +40,7 @@ func ExampleSign() {
// Verify the signature for the message using the public key.
pubKey := privKey.PubKey()
verified := signature.Verify(messageHash, pubKey)
verified := signature.Verify(messageHash[:], pubKey)
fmt.Printf("Signature Verified? %v\n", verified)
// Output:
@ -81,8 +81,8 @@ func ExampleSignature_Verify() {
// Verify the signature for the message using the public key.
message := "test message"
messageHash := chainhash.HashB([]byte(message))
verified := signature.Verify(messageHash, pubKey)
messageHash := blake256.Sum256([]byte(message))
verified := signature.Verify(messageHash[:], pubKey)
fmt.Println("Signature Verified?", verified)
// Output: