Example usage for org.bouncycastle.crypto.signers ECDSASigner verifySignature

List of usage examples for org.bouncycastle.crypto.signers ECDSASigner verifySignature

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Introduction

In this page you can find the example usage for org.bouncycastle.crypto.signers ECDSASigner verifySignature.

Prototype

public boolean verifySignature(byte[] message, BigInteger r, BigInteger s)

Source Link

Document

return true if the value r and s represent a DSA signature for the passed in message (for standard DSA the message should be a SHA-1 hash of the real message to be verified).

Usage

From source file:ACNS.thresholdDSA.Util.java

License:Apache License

public static boolean verifySignature(byte[] message, BigInteger r, BigInteger s, byte[] pub,
        ECDomainParameters Curve) {//ww w . j av  a  2s  .c  o m
    ECDSASigner signer = new ECDSASigner();
    ECPublicKeyParameters params = new ECPublicKeyParameters(Curve.getCurve().decodePoint(pub), Curve);
    signer.init(false, params);
    try {
        return signer.verifySignature(message, r, s);
    } catch (NullPointerException e) {
        // Bouncy Castle contains a bug that can cause NPEs given specially
        // crafted signatures. Those signatures
        // are inherently invalid/attack sigs so we just fail them here
        // rather than crash the thread.
        System.out.println("Caught NPE inside bouncy castle");
        e.printStackTrace();
        return false;
    }
}

From source file:com.aaasec.sigserv.cscommon.xmldsig.XMLSign.java

License:EUPL

public static boolean ecdsaVerifyDigest(byte[] digest, EcdsaSigValue signature, PublicKey pubKey) {
    try {//from  w  ww  . jav a  2s  . c  om
        ECDSASigner ecdsa = new ECDSASigner();
        CipherParameters param = ECUtil.generatePublicKeyParameter(pubKey);
        ecdsa.init(false, param);
        EcdsaSigValue sigVal = EcdsaSigValue.getInstance(signature);
        return ecdsa.verifySignature(digest, sigVal.getR(), sigVal.getS());
    } catch (Exception ex) {
        Logger.getLogger(XMLSign.class.getName()).log(Level.SEVERE, null, ex);
    }
    return false;
}

From source file:com.bitsofproof.supernode.api.ECKeyPair.java

License:Apache License

public static boolean verify(byte[] hash, byte[] signature, byte[] pub) {
    ASN1InputStream asn1 = new ASN1InputStream(signature);
    try {// w  w w.j a  va2  s  . com
        ECDSASigner signer = new ECDSASigner();
        signer.init(false, new ECPublicKeyParameters(curve.getCurve().decodePoint(pub), domain));

        DLSequence seq = (DLSequence) asn1.readObject();
        BigInteger r = ((DERInteger) seq.getObjectAt(0)).getPositiveValue();
        BigInteger s = ((DERInteger) seq.getObjectAt(1)).getPositiveValue();
        return signer.verifySignature(hash, r, s);
    } catch (Exception e) {
        // threat format errors as invalid signatures
        return false;
    } finally {
        try {
            asn1.close();
        } catch (IOException e) {
        }
    }
}

From source file:com.DSC.crypto.ECDSA.java

License:Open Source License

/**
 * Verify the data, return true if the signature is valid, false otherwise
 * @param pubKey/*from   w w w  .jav  a 2s .  c o m*/
 * @param data
 * @param signature
 * @return
 */
private static boolean verify(CipherParameters pubKey, byte[] data, BigInteger[] signature) {
    ECDSASigner ecdsa = new ECDSASigner();
    ecdsa.init(false, pubKey);
    return ecdsa.verifySignature(data, signature[0], signature[1]);
}

From source file:com.github.horrorho.inflatabledonkey.crypto.ec.ECCurvePoint.java

License:Open Source License

public boolean verifySignature(byte[] message, BigInteger r, BigInteger s) {
    ECDomainParameters ecDomainParameters = ECAssistant.ecDomainParametersFrom(x9ECParameters);
    ECPublicKeyParameters ecPublicKeyParameters = new ECPublicKeyParameters(Q, ecDomainParameters);

    ECDSASigner signer = new ECDSASigner();
    signer.init(false, ecPublicKeyParameters);

    return signer.verifySignature(message, r, s);
}

From source file:com.github.horrorho.inflatabledonkey.crypto.eckey.DefaultECPublicKey.java

License:Open Source License

@Override
public boolean verifySignature(byte[] message, BigInteger r, BigInteger s) {
    ECDomainParameters ecDomainParameters = ECAssistant.ecDomainParametersFrom(x9ECParameters);
    ECPublicKeyParameters ecPublicKeyParameters = new ECPublicKeyParameters(Q, ecDomainParameters);

    ECDSASigner signer = new ECDSASigner();
    signer.init(false, ecPublicKeyParameters);

    return signer.verifySignature(message, r, s);
}

From source file:com.google.bitcoin.core.ECKey.java

License:Apache License

/**
 * <p>Verifies the given ECDSA signature against the message bytes using the public key bytes.</p>
 * /*w  ww  . j a  v  a 2 s  .  co m*/
 * <p>When using native ECDSA verification, data must be 32 bytes, and no element may be
 * larger than 520 bytes.</p>
 *
 * @param data      Hash of the data to verify.
 * @param signature ASN.1 encoded signature.
 * @param pub       The public key bytes to use.
 */
public static boolean verify(byte[] data, ECDSASignature signature, byte[] pub) {
    if (FAKE_SIGNATURES)
        return true;

    if (NativeSecp256k1.enabled)
        return NativeSecp256k1.verify(data, signature.encodeToDER(), pub);

    ECDSASigner signer = new ECDSASigner();
    ECPublicKeyParameters params = new ECPublicKeyParameters(CURVE.getCurve().decodePoint(pub), CURVE);
    signer.init(false, params);
    try {
        return signer.verifySignature(data, signature.r, signature.s);
    } catch (NullPointerException e) {
        // Bouncy Castle contains a bug that can cause NPEs given specially crafted signatures. Those signatures
        // are inherently invalid/attack sigs so we just fail them here rather than crash the thread.
        log.error("Caught NPE inside bouncy castle");
        e.printStackTrace();
        return false;
    }
}

From source file:COSE.SignCommon.java

boolean validateSignature(byte[] rgbToBeSigned, byte[] rgbSignature, CipherParameters key)
        throws CoseException {
    AlgorithmID alg = AlgorithmID.FromCBOR(findAttribute(HeaderKeys.Algorithm));
    Digest digest;/*from   ww  w .j  a  v  a 2 s  . c  o  m*/

    switch (alg) {
    case ECDSA_256:
        digest = new SHA256Digest();
        break;

    case ECDSA_384:
        digest = new SHA384Digest();
        break;

    case ECDSA_512:
        digest = new SHA512Digest();
        break;

    default:
        throw new CoseException("Unsupported algorithm specified");
    }

    switch (alg) {
    case ECDSA_256:
    case ECDSA_384:
    case ECDSA_512: {
        byte[] rgbR = new byte[rgbSignature.length / 2];
        byte[] rgbS = new byte[rgbSignature.length / 2];
        System.arraycopy(rgbSignature, 0, rgbR, 0, rgbR.length);
        System.arraycopy(rgbSignature, rgbR.length, rgbS, 0, rgbR.length);

        digest.update(rgbToBeSigned, 0, rgbToBeSigned.length);
        byte[] rgbDigest = new byte[digest.getDigestSize()];
        digest.doFinal(rgbDigest, 0);

        ECDSASigner ecdsa = new ECDSASigner();
        ecdsa.init(false, key);
        return ecdsa.verifySignature(rgbDigest, new BigInteger(1, rgbR), new BigInteger(1, rgbS));
    }

    default:
        throw new CoseException("Internal error");
    }
}

From source file:COSE.SignCommon.java

boolean validateSignature(byte[] rgbToBeSigned, byte[] rgbSignature, OneKey cnKey) throws CoseException {
    AlgorithmID alg = AlgorithmID.FromCBOR(findAttribute(HeaderKeys.Algorithm));
    Digest digest;/*w w  w . jav a 2  s  .  co  m*/

    switch (alg) {
    case ECDSA_256:
        digest = new SHA256Digest();
        break;

    case ECDSA_384:
        digest = new SHA384Digest();
        break;

    case ECDSA_512:
        digest = new SHA512Digest();
        break;

    default:
        throw new CoseException("Unsupported algorithm specified");
    }

    switch (alg) {
    case ECDSA_256:
    case ECDSA_384:
    case ECDSA_512: {
        byte[] rgbR = new byte[rgbSignature.length / 2];
        byte[] rgbS = new byte[rgbSignature.length / 2];
        System.arraycopy(rgbSignature, 0, rgbR, 0, rgbR.length);
        System.arraycopy(rgbSignature, rgbR.length, rgbS, 0, rgbR.length);

        digest.update(rgbToBeSigned, 0, rgbToBeSigned.length);
        byte[] rgbDigest = new byte[digest.getDigestSize()];
        digest.doFinal(rgbDigest, 0);

        X9ECParameters p = cnKey.GetCurve();
        ECDomainParameters parameters = new ECDomainParameters(p.getCurve(), p.getG(), p.getN(), p.getH());
        BigInteger bnX = new BigInteger(1, cnKey.get(KeyKeys.EC2_X).GetByteString());
        ECPoint point = p.getCurve().createPoint(bnX,
                new BigInteger(1, cnKey.get(KeyKeys.EC2_Y).GetByteString()));

        ECPublicKeyParameters pubKey = new ECPublicKeyParameters(point, parameters);

        ECDSASigner ecdsa = new ECDSASigner();
        ecdsa.init(false, pubKey);
        return ecdsa.verifySignature(rgbDigest, new BigInteger(1, rgbR), new BigInteger(1, rgbS));
    }

    default:
        throw new CoseException("Internal error");
    }
}

From source file:COSE.Signer.java

static boolean validateSignature(AlgorithmID alg, byte[] rgbToBeSigned, byte[] rgbSignature, OneKey cnKey)
        throws CoseException {
    Digest digest;/*from w  ww .jav a  2  s  . c  o  m*/

    switch (alg) {
    case ECDSA_256:
        digest = new SHA256Digest();
        break;

    case ECDSA_384:
        digest = new SHA384Digest();
        break;

    case ECDSA_512:
        digest = new SHA512Digest();
        break;

    default:
        throw new CoseException("Unsupported algorithm specified");
    }

    switch (alg) {
    case ECDSA_256:
    case ECDSA_384:
    case ECDSA_512: {
        byte[] rgbR = new byte[rgbSignature.length / 2];
        byte[] rgbS = new byte[rgbSignature.length / 2];
        System.arraycopy(rgbSignature, 0, rgbR, 0, rgbR.length);
        System.arraycopy(rgbSignature, rgbR.length, rgbS, 0, rgbR.length);

        digest.update(rgbToBeSigned, 0, rgbToBeSigned.length);
        byte[] rgbDigest = new byte[digest.getDigestSize()];
        digest.doFinal(rgbDigest, 0);

        X9ECParameters p = cnKey.GetCurve();
        ECDomainParameters parameters = new ECDomainParameters(p.getCurve(), p.getG(), p.getN(), p.getH());
        BigInteger bnX = new BigInteger(1, cnKey.get(KeyKeys.EC2_X.AsCBOR()).GetByteString());
        ECPoint point = p.getCurve().createPoint(bnX,
                new BigInteger(1, cnKey.get(KeyKeys.EC2_Y.AsCBOR()).GetByteString()));

        ECPublicKeyParameters pubKey = new ECPublicKeyParameters(point, parameters);

        ECDSASigner ecdsa = new ECDSASigner();
        ecdsa.init(false, pubKey);
        return ecdsa.verifySignature(rgbDigest, new BigInteger(1, rgbR), new BigInteger(1, rgbS));
    }

    default:
        throw new CoseException("Internal error");
    }
}