// TestSigCacheAddEvictEntry tests the eviction case where a new signature
// triplet is added to a full signature cache which should trigger randomized
// eviction, followed by adding the new element to the cache.
func TestSigCacheAddEvictEntry(t *testing.T) {
// Create a sigcache that can hold up to 100 entries.
sigCacheSize := uint(100)
sigCache := NewSigCache(sigCacheSize)
// Fill the sigcache up with some random sig triplets.
for i := uint(0); i < sigCacheSize; i++ {
msg, sig, key, err := genRandomSig()
if err != nil {
t.Fatalf("unable to generate random signature test data")
}
sigCache.Add(*msg, sig, key)
sigCopy, _ := btcec.ParseSignature(sig.Serialize(), btcec.S256())
keyCopy, _ := btcec.ParsePubKey(key.SerializeCompressed(), btcec.S256())
if !sigCache.Exists(*msg, sigCopy, keyCopy) {
t.Errorf("previously added item not found in signature" +
"cache")
}
}
// The sigcache should now have sigCacheSize entries within it.
if uint(len(sigCache.validSigs)) != sigCacheSize {
t.Fatalf("sigcache should now have %v entries, instead it has %v",
sigCacheSize, len(sigCache.validSigs))
}
// Add a new entry, this should cause eviction of a randomly chosen
// previous entry.
msgNew, sigNew, keyNew, err := genRandomSig()
if err != nil {
t.Fatalf("unable to generate random signature test data")
}
sigCache.Add(*msgNew, sigNew, keyNew)
// The sigcache should still have sigCache entries.
if uint(len(sigCache.validSigs)) != sigCacheSize {
t.Fatalf("sigcache should now have %v entries, instead it has %v",
sigCacheSize, len(sigCache.validSigs))
}
// The entry added above should be found within the sigcache.
sigNewCopy, _ := btcec.ParseSignature(sigNew.Serialize(), btcec.S256())
keyNewCopy, _ := btcec.ParsePubKey(keyNew.SerializeCompressed(), btcec.S256())
if !sigCache.Exists(*msgNew, sigNewCopy, keyNewCopy) {
t.Fatalf("previously added item not found in signature cache")
}
}
func TestPubKeys(t *testing.T) {
for _, test := range pubKeyTests {
pk, err := btcec.ParsePubKey(test.key, btcec.S256())
if err != nil {
if test.isValid {
t.Errorf("%s pubkey failed when shouldn't %v",
test.name, err)
}
continue
}
if !test.isValid {
t.Errorf("%s counted as valid when it should fail",
test.name)
continue
}
var pkStr []byte
switch test.format {
case btcec.TstPubkeyUncompressed:
pkStr = (*btcec.PublicKey)(pk).SerializeUncompressed()
case btcec.TstPubkeyCompressed:
pkStr = (*btcec.PublicKey)(pk).SerializeCompressed()
case btcec.TstPubkeyHybrid:
pkStr = (*btcec.PublicKey)(pk).SerializeHybrid()
}
if !bytes.Equal(test.key, pkStr) {
t.Errorf("%s pubkey: serialized keys do not match.",
test.name)
spew.Dump(test.key)
spew.Dump(pkStr)
}
}
}
// TestSigCacheAddMaxEntriesZeroOrNegative tests that if a sigCache is created
// with a max size <= 0, then no entries are added to the sigcache at all.
func TestSigCacheAddMaxEntriesZeroOrNegative(t *testing.T) {
// Create a sigcache that can hold up to 0 entries.
sigCache := NewSigCache(0)
// Generate a random sigCache entry triplet.
msg1, sig1, key1, err := genRandomSig()
if err != nil {
t.Errorf("unable to generate random signature test data")
}
// Add the triplet to the signature cache.
sigCache.Add(*msg1, sig1, key1)
// The generated triplet should not be found.
sig1Copy, _ := btcec.ParseSignature(sig1.Serialize(), btcec.S256())
key1Copy, _ := btcec.ParsePubKey(key1.SerializeCompressed(), btcec.S256())
if sigCache.Exists(*msg1, sig1Copy, key1Copy) {
t.Errorf("previously added signature found in sigcache, but" +
"shouldn't have been")
}
// There shouldn't be any entries in the sigCache.
if len(sigCache.validSigs) != 0 {
t.Errorf("%v items found in sigcache, no items should have"+
"been added", len(sigCache.validSigs))
}
}
// TstAddressPubKey makes an AddressPubKey, setting the unexported fields with
// the parameters.
func TstAddressPubKey(serializedPubKey []byte, pubKeyFormat PubKeyFormat,
netID byte) *AddressPubKey {
pubKey, _ := btcec.ParsePubKey(serializedPubKey, btcec.S256())
return &AddressPubKey{
pubKeyFormat: pubKeyFormat,
pubKey: (*btcec.PublicKey)(pubKey),
pubKeyHashID: netID,
}
}
// NewKeyFromString returns a new extended key instance from a base58-encoded
// extended key.
func NewKeyFromString(key string) (*ExtendedKey, error) {
// The base58-decoded extended key must consist of a serialized payload
// plus an additional 4 bytes for the checksum.
decoded := base58.Decode(key)
if len(decoded) != serializedKeyLen+4 {
return nil, ErrInvalidKeyLen
}
// The serialized format is:
// version (4) || depth (1) || parent fingerprint (4)) ||
// child num (4) || chain code (32) || key data (33) || checksum (4)
// Split the payload and checksum up and ensure the checksum matches.
payload := decoded[:len(decoded)-4]
checkSum := decoded[len(decoded)-4:]
expectedCheckSum := wire.DoubleSha256(payload)[:4]
if !bytes.Equal(checkSum, expectedCheckSum) {
return nil, ErrBadChecksum
}
// Deserialize each of the payload fields.
version := payload[:4]
depth := uint16(payload[4:5][0])
parentFP := payload[5:9]
childNum := binary.BigEndian.Uint32(payload[9:13])
chainCode := payload[13:45]
keyData := payload[45:78]
// The key data is a private key if it starts with 0x00. Serialized
// compressed pubkeys either start with 0x02 or 0x03.
isPrivate := keyData[0] == 0x00
if isPrivate {
// Ensure the private key is valid. It must be within the range
// of the order of the secp256k1 curve and not be 0.
keyData = keyData[1:]
keyNum := new(big.Int).SetBytes(keyData)
if keyNum.Cmp(btcec.S256().N) >= 0 || keyNum.Sign() == 0 {
return nil, ErrUnusableSeed
}
} else {
// Ensure the public key parses correctly and is actually on the
// secp256k1 curve.
_, err := btcec.ParsePubKey(keyData, btcec.S256())
if err != nil {
return nil, err
}
}
return newExtendedKey(version, keyData, chainCode, parentFP, depth,
childNum, isPrivate), nil
}
func TestPrivKeys(t *testing.T) {
tests := []struct {
name string
key []byte
}{
{
name: "check curve",
key: []byte{
0xea, 0xf0, 0x2c, 0xa3, 0x48, 0xc5, 0x24, 0xe6,
0x39, 0x26, 0x55, 0xba, 0x4d, 0x29, 0x60, 0x3c,
0xd1, 0xa7, 0x34, 0x7d, 0x9d, 0x65, 0xcf, 0xe9,
0x3c, 0xe1, 0xeb, 0xff, 0xdc, 0xa2, 0x26, 0x94,
},
},
}
for _, test := range tests {
priv, pub := btcec.PrivKeyFromBytes(btcec.S256(), test.key)
_, err := btcec.ParsePubKey(
pub.SerializeUncompressed(), btcec.S256())
if err != nil {
t.Errorf("%s privkey: %v", test.name, err)
continue
}
hash := []byte{0x0, 0x1, 0x2, 0x3, 0x4, 0x5, 0x6, 0x7, 0x8, 0x9}
sig, err := priv.Sign(hash)
if err != nil {
t.Errorf("%s could not sign: %v", test.name, err)
continue
}
if !sig.Verify(hash, pub) {
t.Errorf("%s could not verify: %v", test.name, err)
continue
}
serializedKey := priv.Serialize()
if !bytes.Equal(serializedKey, test.key) {
t.Errorf("%s unexpected serialized bytes - got: %x, "+
"want: %x", test.name, serializedKey, test.key)
}
}
}
// This example demonstrates encrypting a message for a public key that is first
// parsed from raw bytes, then decrypting it using the corresponding private key.
func Example_encryptMessage() {
// Decode the hex-encoded pubkey of the recipient.
pubKeyBytes, err := hex.DecodeString("04115c42e757b2efb7671c578530ec191a1" +
"359381e6a71127a9d37c486fd30dae57e76dc58f693bd7e7010358ce6b165e483a29" +
"21010db67ac11b1b51b651953d2") // uncompressed pubkey
if err != nil {
fmt.Println(err)
return
}
pubKey, err := btcec.ParsePubKey(pubKeyBytes, btcec.S256())
if err != nil {
fmt.Println(err)
return
}
// Encrypt a message decryptable by the private key corresponding to pubKey
message := "test message"
ciphertext, err := btcec.Encrypt(pubKey, []byte(message))
if err != nil {
fmt.Println(err)
return
}
// Decode the hex-encoded private key.
pkBytes, err := hex.DecodeString("a11b0a4e1a132305652ee7a8eb7848f6ad" +
"5ea381e3ce20a2c086a2e388230811")
if err != nil {
fmt.Println(err)
return
}
// note that we already have corresponding pubKey
privKey, _ := btcec.PrivKeyFromBytes(btcec.S256(), pkBytes)
// Try decrypting and verify if it's the same message.
plaintext, err := btcec.Decrypt(privKey, ciphertext)
if err != nil {
fmt.Println(err)
return
}
fmt.Println(string(plaintext))
// Output:
// test message
}
// TestSigCacheAddExists tests the ability to add, and later check the
// existence of a signature triplet in the signature cache.
func TestSigCacheAddExists(t *testing.T) {
sigCache := NewSigCache(200)
// Generate a random sigCache entry triplet.
msg1, sig1, key1, err := genRandomSig()
if err != nil {
t.Errorf("unable to generate random signature test data")
}
// Add the triplet to the signature cache.
sigCache.Add(*msg1, sig1, key1)
// The previously added triplet should now be found within the sigcache.
sig1Copy, _ := btcec.ParseSignature(sig1.Serialize(), btcec.S256())
key1Copy, _ := btcec.ParsePubKey(key1.SerializeCompressed(), btcec.S256())
if !sigCache.Exists(*msg1, sig1Copy, key1Copy) {
t.Errorf("previously added item not found in signature cache")
}
}
// 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 Example_verifySignature() {
// Decode hex-encoded serialized public key.
pubKeyBytes, err := hex.DecodeString("02a673638cb9587cb68ea08dbef685c" +
"6f2d2a751a8b3c6f2a7e9a4999e6e4bfaf5")
if err != nil {
fmt.Println(err)
return
}
pubKey, err := btcec.ParsePubKey(pubKeyBytes, btcec.S256())
if err != nil {
fmt.Println(err)
return
}
// Decode hex-encoded serialized signature.
sigBytes, err := hex.DecodeString("30450220090ebfb3690a0ff115bb1b38b" +
"8b323a667b7653454f1bccb06d4bbdca42c2079022100ec95778b51e707" +
"1cb1205f8bde9af6592fc978b0452dafe599481c46d6b2e479")
if err != nil {
fmt.Println(err)
return
}
signature, err := btcec.ParseSignature(sigBytes, btcec.S256())
if err != nil {
fmt.Println(err)
return
}
// Verify the signature for the message using the public key.
message := "test message"
messageHash := wire.DoubleSha256([]byte(message))
verified := signature.Verify(messageHash, pubKey)
fmt.Println("Signature Verified?", verified)
// Output:
// Signature Verified? true
}
// NewAddressPubKey returns a new AddressPubKey which represents a pay-to-pubkey
// address. The serializedPubKey parameter must be a valid pubkey and can be
// uncompressed, compressed, or hybrid.
func NewAddressPubKey(serializedPubKey []byte, net *chaincfg.Params) (*AddressPubKey, error) {
pubKey, err := btcec.ParsePubKey(serializedPubKey, btcec.S256())
if err != nil {
return nil, err
}
// Set the format of the pubkey. This probably should be returned
// from btcec, but do it here to avoid API churn. We already know the
// pubkey is valid since it parsed above, so it's safe to simply examine
// the leading byte to get the format.
pkFormat := PKFUncompressed
switch serializedPubKey[0] {
case 0x02, 0x03:
pkFormat = PKFCompressed
case 0x06, 0x07:
pkFormat = PKFHybrid
}
return &AddressPubKey{
pubKeyFormat: pkFormat,
pubKey: pubKey,
pubKeyHashID: net.PubKeyHashAddrID,
}, nil
}
// ECPubKey converts the extended key to a btcec public key and returns it.
func (k *ExtendedKey) ECPubKey() (*btcec.PublicKey, error) {
return btcec.ParsePubKey(k.pubKeyBytes(), btcec.S256())
}
// Child returns a derived child extended key at the given index. When this
// extended key is a private extended key (as determined by the IsPrivate
// function), a private extended key will be derived. Otherwise, the derived
// extended key will be also be a public extended key.
//
// When the index is greater to or equal than the HardenedKeyStart constant, the
// derived extended key will be a hardened extended key. It is only possible to
// derive a hardended extended key from a private extended key. Consequently,
// this function will return ErrDeriveHardFromPublic if a hardened child
// extended key is requested from a public extended key.
//
// A hardened extended key is useful since, as previously mentioned, it requires
// a parent private extended key to derive. In other words, normal child
// extended public keys can be derived from a parent public extended key (no
// knowledge of the parent private key) whereas hardened extended keys may not
// be.
//
// NOTE: There is an extremely small chance (< 1 in 2^127) the specific child
// index does not derive to a usable child. The ErrInvalidChild error will be
// returned if this should occur, and the caller is expected to ignore the
// invalid child and simply increment to the next index.
func (k *ExtendedKey) Child(i uint32) (*ExtendedKey, error) {
// There are four scenarios that could happen here:
// 1) Private extended key -> Hardened child private extended key
// 2) Private extended key -> Non-hardened child private extended key
// 3) Public extended key -> Non-hardened child public extended key
// 4) Public extended key -> Hardened child public extended key (INVALID!)
// Case #4 is invalid, so error out early.
// A hardened child extended key may not be created from a public
// extended key.
isChildHardened := i >= HardenedKeyStart
if !k.isPrivate && isChildHardened {
return nil, ErrDeriveHardFromPublic
}
// The data used to derive the child key depends on whether or not the
// child is hardened per [BIP32].
//
// For hardened children:
// 0x00 || ser256(parentKey) || ser32(i)
//
// For normal children:
// serP(parentPubKey) || ser32(i)
keyLen := 33
data := make([]byte, keyLen+4)
if isChildHardened {
// Case #1.
// When the child is a hardened child, the key is known to be a
// private key due to the above early return. Pad it with a
// leading zero as required by [BIP32] for deriving the child.
copy(data[1:], k.key)
} else {
// Case #2 or #3.
// This is either a public or private extended key, but in
// either case, the data which is used to derive the child key
// starts with the secp256k1 compressed public key bytes.
copy(data, k.pubKeyBytes())
}
binary.BigEndian.PutUint32(data[keyLen:], i)
// Take the HMAC-SHA512 of the current key's chain code and the derived
// data:
// I = HMAC-SHA512(Key = chainCode, Data = data)
hmac512 := hmac.New(sha512.New, k.chainCode)
hmac512.Write(data)
ilr := hmac512.Sum(nil)
// Split "I" into two 32-byte sequences Il and Ir where:
// Il = intermediate key used to derive the child
// Ir = child chain code
il := ilr[:len(ilr)/2]
childChainCode := ilr[len(ilr)/2:]
// Both derived public or private keys rely on treating the left 32-byte
// sequence calculated above (Il) as a 256-bit integer that must be
// within the valid range for a secp256k1 private key. There is a small
// chance (< 1 in 2^127) this condition will not hold, and in that case,
// a child extended key can't be created for this index and the caller
// should simply increment to the next index.
ilNum := new(big.Int).SetBytes(il)
if ilNum.Cmp(btcec.S256().N) >= 0 || ilNum.Sign() == 0 {
return nil, ErrInvalidChild
}
// The algorithm used to derive the child key depends on whether or not
// a private or public child is being derived.
//
// For private children:
// childKey = parse256(Il) + parentKey
//
// For public children:
// childKey = serP(point(parse256(Il)) + parentKey)
var isPrivate bool
var childKey []byte
if k.isPrivate {
// Case #1 or #2.
// Add the parent private key to the intermediate private key to
// derive the final child key.
//
// childKey = parse256(Il) + parenKey
keyNum := new(big.Int).SetBytes(k.key)
ilNum.Add(ilNum, keyNum)
ilNum.Mod(ilNum, btcec.S256().N)
childKey = ilNum.Bytes()
isPrivate = true
} else {
// Case #3.
// Calculate the corresponding intermediate public key for
// intermediate private key.
ilx, ily := btcec.S256().ScalarBaseMult(il)
if ilx.Sign() == 0 || ily.Sign() == 0 {
return nil, ErrInvalidChild
}
// Convert the serialized compressed parent public key into X
// and Y coordinates so it can be added to the intermediate
// public key.
pubKey, err := btcec.ParsePubKey(k.key, btcec.S256())
if err != nil {
return nil, err
}
// Add the intermediate public key to the parent public key to
// derive the final child key.
//
// childKey = serP(point(parse256(Il)) + parentKey)
childX, childY := btcec.S256().Add(ilx, ily, pubKey.X, pubKey.Y)
pk := btcec.PublicKey{Curve: btcec.S256(), X: childX, Y: childY}
childKey = pk.SerializeCompressed()
}
// The fingerprint of the parent for the derived child is the first 4
// bytes of the RIPEMD160(SHA256(parentPubKey)).
parentFP := coinutil.Hash160(k.pubKeyBytes())[:4]
return newExtendedKey(k.version, childKey, childChainCode, parentFP,
k.depth+1, i, isPrivate), nil
}
func TestChaining(t *testing.T) {
tests := []struct {
name string
cc []byte
origPrivateKey []byte
nextPrivateKeyUncompressed []byte
nextPrivateKeyCompressed []byte
nextPublicKeyUncompressed []byte
nextPublicKeyCompressed []byte
}{
{
name: "chaintest 1",
cc: []byte("3318959fff419ab8b556facb3c429a86"),
origPrivateKey: []byte("5ffc975976eaaa1f7b179f384ebbc053"),
nextPrivateKeyUncompressed: []byte{
0xd3, 0xfe, 0x2e, 0x96, 0x44, 0x12, 0x2d, 0xaa,
0x80, 0x8e, 0x36, 0x17, 0xb5, 0x9f, 0x8c, 0xd2,
0x72, 0x8c, 0xaf, 0xf1, 0xdb, 0xd6, 0x4a, 0x92,
0xd7, 0xc7, 0xee, 0x2b, 0x56, 0x34, 0xe2, 0x87,
},
nextPrivateKeyCompressed: []byte{
0x08, 0x56, 0x7a, 0x1b, 0x89, 0x56, 0x2e, 0xfa,
0xb4, 0x02, 0x59, 0x69, 0x10, 0xc3, 0x60, 0x1f,
0x34, 0xf0, 0x55, 0x02, 0x8a, 0xbf, 0x37, 0xf5,
0x22, 0x80, 0x9f, 0xd2, 0xe5, 0x42, 0x5b, 0x2d,
},
nextPublicKeyUncompressed: []byte{
0x04, 0xdd, 0x70, 0x31, 0xa5, 0xf9, 0x06, 0x70,
0xd3, 0x9a, 0x24, 0x5b, 0xd5, 0x73, 0xdd, 0xb6,
0x15, 0x81, 0x0b, 0x78, 0x19, 0xbc, 0xc8, 0x26,
0xc9, 0x16, 0x86, 0x73, 0xae, 0xe4, 0xc0, 0xed,
0x39, 0x81, 0xb4, 0x86, 0x2d, 0x19, 0x8c, 0x67,
0x9c, 0x93, 0x99, 0xf6, 0xd2, 0x3f, 0xd1, 0x53,
0x9e, 0xed, 0xbd, 0x07, 0xd6, 0x4f, 0xa9, 0x81,
0x61, 0x85, 0x46, 0x84, 0xb1, 0xa0, 0xed, 0xbc,
0xa7,
},
nextPublicKeyCompressed: []byte{
0x02, 0x2c, 0x48, 0x73, 0x37, 0x35, 0x74, 0x7f,
0x05, 0x58, 0xc1, 0x4e, 0x0d, 0x18, 0xc2, 0xbf,
0xcc, 0x83, 0xa2, 0x4d, 0x64, 0xab, 0xba, 0xea,
0xeb, 0x4c, 0xcd, 0x4c, 0x0c, 0x21, 0xc4, 0x30,
0x0f,
},
},
}
for _, test := range tests {
// Create both uncompressed and compressed public keys for original
// private key.
origPubUncompressed := pubkeyFromPrivkey(test.origPrivateKey, false)
origPubCompressed := pubkeyFromPrivkey(test.origPrivateKey, true)
// Create next chained private keys, chained from both the uncompressed
// and compressed pubkeys.
nextPrivUncompressed, err := chainedPrivKey(test.origPrivateKey,
origPubUncompressed, test.cc)
if err != nil {
t.Errorf("%s: Uncompressed chainedPrivKey failed: %v", test.name, err)
return
}
nextPrivCompressed, err := chainedPrivKey(test.origPrivateKey,
origPubCompressed, test.cc)
if err != nil {
t.Errorf("%s: Compressed chainedPrivKey failed: %v", test.name, err)
return
}
// Verify that the new private keys match the expected values
// in the test case.
if !bytes.Equal(nextPrivUncompressed, test.nextPrivateKeyUncompressed) {
t.Errorf("%s: Next private key (from uncompressed pubkey) does not match expected.\nGot: %s\nExpected: %s",
test.name, spew.Sdump(nextPrivUncompressed), spew.Sdump(test.nextPrivateKeyUncompressed))
return
}
if !bytes.Equal(nextPrivCompressed, test.nextPrivateKeyCompressed) {
t.Errorf("%s: Next private key (from compressed pubkey) does not match expected.\nGot: %s\nExpected: %s",
test.name, spew.Sdump(nextPrivCompressed), spew.Sdump(test.nextPrivateKeyCompressed))
return
}
// Create the next pubkeys generated from the next private keys.
nextPubUncompressedFromPriv := pubkeyFromPrivkey(nextPrivUncompressed, false)
nextPubCompressedFromPriv := pubkeyFromPrivkey(nextPrivCompressed, true)
// Create the next pubkeys by chaining directly off the original
// pubkeys (without using the original's private key).
nextPubUncompressedFromPub, err := chainedPubKey(origPubUncompressed, test.cc)
if err != nil {
t.Errorf("%s: Uncompressed chainedPubKey failed: %v", test.name, err)
return
}
nextPubCompressedFromPub, err := chainedPubKey(origPubCompressed, test.cc)
if err != nil {
t.Errorf("%s: Compressed chainedPubKey failed: %v", test.name, err)
return
}
// Public keys (used to generate the bitcoin address) MUST match.
if !bytes.Equal(nextPubUncompressedFromPriv, nextPubUncompressedFromPub) {
t.Errorf("%s: Uncompressed public keys do not match.", test.name)
}
if !bytes.Equal(nextPubCompressedFromPriv, nextPubCompressedFromPub) {
t.Errorf("%s: Compressed public keys do not match.", test.name)
}
// Verify that all generated public keys match the expected
// values in the test case.
if !bytes.Equal(nextPubUncompressedFromPub, test.nextPublicKeyUncompressed) {
t.Errorf("%s: Next uncompressed public keys do not match expected value.\nGot: %s\nExpected: %s",
test.name, spew.Sdump(nextPubUncompressedFromPub), spew.Sdump(test.nextPublicKeyUncompressed))
return
}
if !bytes.Equal(nextPubCompressedFromPub, test.nextPublicKeyCompressed) {
t.Errorf("%s: Next compressed public keys do not match expected value.\nGot: %s\nExpected: %s",
test.name, spew.Sdump(nextPubCompressedFromPub), spew.Sdump(test.nextPublicKeyCompressed))
return
}
// Sign data with the next private keys and verify signature with
// the next pubkeys.
pubkeyUncompressed, err := btcec.ParsePubKey(nextPubUncompressedFromPub, btcec.S256())
if err != nil {
t.Errorf("%s: Unable to parse next uncompressed pubkey: %v", test.name, err)
return
}
pubkeyCompressed, err := btcec.ParsePubKey(nextPubCompressedFromPub, btcec.S256())
if err != nil {
t.Errorf("%s: Unable to parse next compressed pubkey: %v", test.name, err)
return
}
privkeyUncompressed := &btcec.PrivateKey{
PublicKey: *pubkeyUncompressed.ToECDSA(),
D: new(big.Int).SetBytes(nextPrivUncompressed),
}
privkeyCompressed := &btcec.PrivateKey{
PublicKey: *pubkeyCompressed.ToECDSA(),
D: new(big.Int).SetBytes(nextPrivCompressed),
}
data := "String to sign."
sig, err := privkeyUncompressed.Sign([]byte(data))
if err != nil {
t.Errorf("%s: Unable to sign data with next private key (chained from uncompressed pubkey): %v",
test.name, err)
return
}
ok := sig.Verify([]byte(data), privkeyUncompressed.PubKey())
if !ok {
t.Errorf("%s: btcec signature verification failed for next keypair (chained from uncompressed pubkey).",
test.name)
return
}
sig, err = privkeyCompressed.Sign([]byte(data))
if err != nil {
t.Errorf("%s: Unable to sign data with next private key (chained from compressed pubkey): %v",
test.name, err)
return
}
ok = sig.Verify([]byte(data), privkeyCompressed.PubKey())
if !ok {
t.Errorf("%s: btcec signature verification failed for next keypair (chained from compressed pubkey).",
test.name)
return
}
}
}