Example usage for org.bouncycastle.asn1 DLSequence getEncoded

Introduction

In this page you can find the example usage for org.bouncycastle.asn1 DLSequence getEncoded.

Prototype

public byte[] getEncoded() throws IOException 

Source Link

Document

Return the default BER or DER encoding for this object.

Usage

From source file:org.certificateservices.custom.c2x.its.crypto.DefaultCryptoManager.java

License:Open Source License

/**
 * @see org.certificateservices.custom.c2x.its.crypto.CryptoManager#verifySignature(byte[], Signature, PublicKey)
 *//*from  w  w w  .  java2s  .  c o  m*/
@Override
public boolean verifySignature(byte[] message, Signature signature, PublicKey publicKey)
        throws IllegalArgumentException, SignatureException, IOException {
    PublicKeyAlgorithm alg = signature.getPublicKeyAlgorithm();

    if (alg == PublicKeyAlgorithm.ecdsa_nistp256_with_sha256) {
        try {
            EcdsaSignature ecdsaSignature = signature.getSignatureValue();

            // Create Signature Data
            ASN1Integer asn1R = new ASN1Integer(ecdsaSignature.getR().getX());
            ASN1Integer asn1S = new ASN1Integer(SerializationHelper.readFixedFieldSizeKey(alg,
                    new ByteArrayInputStream(ecdsaSignature.getSignatureValue())));
            DLSequence dLSequence = new DLSequence(new ASN1Encodable[] { asn1R, asn1S });
            byte[] dERSignature = dLSequence.getEncoded();

            byte[] messageDigest = digest(message, alg);

            java.security.Signature sig = java.security.Signature.getInstance("NONEwithECDSA", provider);
            sig.initVerify(publicKey);
            sig.update(messageDigest);
            return sig.verify(dERSignature);
        } catch (Exception e) {
            if (e instanceof IllegalArgumentException) {
                throw (IllegalArgumentException) e;
            }
            if (e instanceof IOException) {
                throw (IOException) e;
            }
            if (e instanceof SignatureException) {
                throw (SignatureException) e;
            }

            throw new SignatureException("Internal error verifying signature " + e.getClass().getSimpleName()
                    + ": " + e.getMessage(), e);
        }

    } else {
        throw new IllegalArgumentException(
                "Unsupported signature algoritm: " + signature.getPublicKeyAlgorithm());
    }
}

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