122 lines
3.3 KiB
Go
122 lines
3.3 KiB
Go
package claim
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import (
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"crypto/ecdsa"
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"crypto/sha256"
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"crypto/x509/pkix"
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"encoding/asn1"
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"encoding/hex"
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"math/big"
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"github.com/lbryio/lbry.go/extras/errors"
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"github.com/lbryio/lbryschema.go/address"
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)
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type publicKeyInfo struct {
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Raw asn1.RawContent
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Algorithm pkix.AlgorithmIdentifier
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PublicKey asn1.BitString
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}
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const SECP256k1 = "SECP256k1"
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//const NIST256p = "NIST256p"
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//const NIST384p = "NIST384p"
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func getClaimSignatureDigest(bytes ...[]byte) [32]byte {
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var combined []byte
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for _, b := range bytes {
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combined = append(combined, b...)
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}
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digest := sha256.Sum256(combined)
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return [32]byte(digest)
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}
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func (c *ClaimHelper) VerifyDigest(certificate *ClaimHelper, signature [64]byte, digest [32]byte) bool {
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if certificate == nil {
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return false
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}
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R := &big.Int{}
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S := &big.Int{}
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R.SetBytes(signature[0:32])
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S.SetBytes(signature[32:64])
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pk, err := certificate.GetPublicKey()
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if err != nil {
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return false
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}
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return ecdsa.Verify(pk.ToECDSA(), digest[:], R, S)
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}
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func (c *ClaimHelper) ValidateClaimSignature(certificate *ClaimHelper, k string, certificateId string, blockchainName string) (bool, error) {
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if c.LegacyClaim != nil {
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return c.validateV1ClaimSignature(certificate, k, certificateId, blockchainName)
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}
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return c.validateClaimSignature(certificate, k, certificateId, blockchainName)
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}
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func (c *ClaimHelper) validateClaimSignature(certificate *ClaimHelper, firstInputTxID, certificateId string, blockchainName string) (bool, error) {
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certificateIdSlice, err := hex.DecodeString(certificateId)
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if err != nil {
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return false, errors.Err(err)
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}
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certificateIdSlice = reverseBytes(certificateIdSlice)
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firstInputTxIDBytes, err := hex.DecodeString(firstInputTxID)
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if err != nil {
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return false, errors.Err(err)
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}
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signature := c.Signature
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if signature == nil {
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return false, errors.Err("claim does not have a signature")
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}
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signatureBytes := [64]byte{}
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for i, b := range signature {
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signatureBytes[i] = b
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}
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serialized, err := c.serialized()
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if err != nil {
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return false, errors.Err("serialization error")
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}
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claimDigest := getClaimSignatureDigest(firstInputTxIDBytes, certificateIdSlice, serialized)
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return c.VerifyDigest(certificate, signatureBytes, claimDigest), nil
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}
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func (c *ClaimHelper) validateV1ClaimSignature(certificate *ClaimHelper, claimAddy string, certificateId string, blockchainName string) (bool, error) {
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addressBytes, err := address.DecodeAddress(claimAddy, blockchainName)
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if err != nil {
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return false, err
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}
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//For V1 claim_id was incorrectly stored for claim signing.
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// So the bytes are not reversed like they are supposed to be (Endianess)
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certificateIdSlice, err := hex.DecodeString(certificateId)
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if err != nil {
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return false, err
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}
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signature := c.Signature
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if signature == nil {
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return false, errors.Err("claim does not have a signature")
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}
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signatureBytes := [64]byte{}
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for i := range signatureBytes {
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signatureBytes[i] = signature[i]
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}
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claimAddress, err := address.ValidateAddress(addressBytes, blockchainName)
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if err != nil {
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return false, errors.Err("invalid address")
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}
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serializedNoSig, err := c.serializedNoSignature()
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if err != nil {
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return false, errors.Err("serialization error")
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}
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claimDigest := getClaimSignatureDigest(claimAddress[:], serializedNoSig, certificateIdSlice)
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return c.VerifyDigest(certificate, signatureBytes, claimDigest), nil
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}
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