50 lines
1.5 KiB
Go
50 lines
1.5 KiB
Go
package claim
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import (
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"crypto/elliptic"
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"crypto/x509/pkix"
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"encoding/asn1"
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"github.com/lbryio/lbry.go/extras/errors"
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"github.com/btcsuite/btcd/btcec"
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)
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func PublicKeyToDER(publicKey *btcec.PublicKey) ([]byte, error) {
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var publicKeyBytes []byte
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var publicKeyAlgorithm pkix.AlgorithmIdentifier
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var err error
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pub := publicKey.ToECDSA()
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publicKeyBytes = elliptic.Marshal(pub.Curve, pub.X, pub.Y)
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//ans1 encoding oid for ecdsa public key https://github.com/golang/go/blob/release-branch.go1.12/src/crypto/x509/x509.go#L457
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publicKeyAlgorithm.Algorithm = asn1.ObjectIdentifier{1, 2, 840, 10045, 2, 1}
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//asn1 encoding oid for secp256k1 https://github.com/bitpay/bitpay-go/blob/v2.2.2/key_utils/key_utils.go#L30
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paramBytes, err := asn1.Marshal(asn1.ObjectIdentifier{1, 3, 132, 0, 10})
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if err != nil {
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return nil, errors.Err(err)
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}
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publicKeyAlgorithm.Parameters.FullBytes = paramBytes
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return asn1.Marshal(publicKeyInfo{
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Algorithm: publicKeyAlgorithm,
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PublicKey: asn1.BitString{
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Bytes: publicKeyBytes,
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BitLength: 8 * len(publicKeyBytes),
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},
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})
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}
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func (c *ClaimHelper) GetPublicKey() (*btcec.PublicKey, error) {
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if c.GetChannel() == nil {
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return nil, errors.Err("claim is not of type channel, so there is no public key to get")
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}
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return getPublicKeyFromBytes(c.GetChannel().PublicKey)
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}
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func getPublicKeyFromBytes(pubKeyBytes []byte) (*btcec.PublicKey, error) {
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PKInfo := publicKeyInfo{}
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asn1.Unmarshal(pubKeyBytes, &PKInfo)
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pubkeyBytes1 := []byte(PKInfo.PublicKey.Bytes)
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return btcec.ParsePubKey(pubkeyBytes1, btcec.S256())
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}
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