use of org.spongycastle.asn1.x9.X9IntegerConverter in project AppCoins-ethereumj by AppStoreFoundation.
the class ECKey method decompressKey.
/**
* Decompress a compressed public key (x co-ord and low-bit of y-coord).
*
* @param xBN -
* @param yBit -
* @return -
*/
private static ECPoint decompressKey(BigInteger xBN, boolean yBit) {
X9IntegerConverter x9 = new X9IntegerConverter();
byte[] compEnc = x9.integerToBytes(xBN, 1 + x9.getByteLength(CURVE.getCurve()));
compEnc[0] = (byte) (yBit ? 0x03 : 0x02);
return CURVE.getCurve().decodePoint(compEnc);
}
use of org.spongycastle.asn1.x9.X9IntegerConverter in project rskj by rsksmart.
the class Secp256k1ServiceBC method decompressKey.
/**
* Decompress a compressed public key (x co-ord and low-bit of y-coord).
*
* @param xBN -
* @param yBit -
* @return -
*/
private ECPoint decompressKey(BigInteger xBN, boolean yBit) {
X9IntegerConverter x9 = new X9IntegerConverter();
byte[] compEnc = x9.integerToBytes(xBN, 1 + x9.getByteLength(CURVE.getCurve()));
compEnc[0] = (byte) (yBit ? 0x03 : 0x02);
return CURVE.getCurve().decodePoint(compEnc);
}
use of org.spongycastle.asn1.x9.X9IntegerConverter in project robovm by robovm.
the class BCECPublicKey method populateFromPubKeyInfo.
private void populateFromPubKeyInfo(SubjectPublicKeyInfo info) {
X962Parameters params = new X962Parameters((ASN1Primitive) info.getAlgorithm().getParameters());
ECCurve curve;
EllipticCurve ellipticCurve;
if (params.isNamedCurve()) {
ASN1ObjectIdentifier oid = (ASN1ObjectIdentifier) params.getParameters();
X9ECParameters ecP = ECUtil.getNamedCurveByOid(oid);
curve = ecP.getCurve();
ellipticCurve = EC5Util.convertCurve(curve, ecP.getSeed());
ecSpec = new ECNamedCurveSpec(ECUtil.getCurveName(oid), ellipticCurve, new ECPoint(ecP.getG().getX().toBigInteger(), ecP.getG().getY().toBigInteger()), ecP.getN(), ecP.getH());
} else if (params.isImplicitlyCA()) {
ecSpec = null;
curve = configuration.getEcImplicitlyCa().getCurve();
} else {
X9ECParameters ecP = X9ECParameters.getInstance(params.getParameters());
curve = ecP.getCurve();
ellipticCurve = EC5Util.convertCurve(curve, ecP.getSeed());
this.ecSpec = new ECParameterSpec(ellipticCurve, new ECPoint(ecP.getG().getX().toBigInteger(), ecP.getG().getY().toBigInteger()), ecP.getN(), ecP.getH().intValue());
}
DERBitString bits = info.getPublicKeyData();
byte[] data = bits.getBytes();
ASN1OctetString key = new DEROctetString(data);
//
if (data[0] == 0x04 && data[1] == data.length - 2 && (data[2] == 0x02 || data[2] == 0x03)) {
int qLength = new X9IntegerConverter().getByteLength(curve);
if (qLength >= data.length - 3) {
try {
key = (ASN1OctetString) ASN1Primitive.fromByteArray(data);
} catch (IOException ex) {
throw new IllegalArgumentException("error recovering public key");
}
}
}
X9ECPoint derQ = new X9ECPoint(curve, key);
this.q = derQ.getPoint();
}
use of org.spongycastle.asn1.x9.X9IntegerConverter in project robovm by robovm.
the class JCEECPublicKey method populateFromPubKeyInfo.
private void populateFromPubKeyInfo(SubjectPublicKeyInfo info) {
// BEGIN android-removed
// if (info.getAlgorithmId().getObjectId().equals(CryptoProObjectIdentifiers.gostR3410_2001))
// {
// DERBitString bits = info.getPublicKeyData();
// ASN1OctetString key;
// this.algorithm = "ECGOST3410";
//
// try
// {
// key = (ASN1OctetString) ASN1Primitive.fromByteArray(bits.getBytes());
// }
// catch (IOException ex)
// {
// throw new IllegalArgumentException("error recovering public key");
// }
//
// byte[] keyEnc = key.getOctets();
// byte[] x = new byte[32];
// byte[] y = new byte[32];
//
// for (int i = 0; i != x.length; i++)
// {
// x[i] = keyEnc[32 - 1 - i];
// }
//
// for (int i = 0; i != y.length; i++)
// {
// y[i] = keyEnc[64 - 1 - i];
// }
//
// gostParams = new GOST3410PublicKeyAlgParameters((ASN1Sequence)info.getAlgorithmId().getParameters());
//
// ECNamedCurveParameterSpec spec = ECGOST3410NamedCurveTable.getParameterSpec(ECGOST3410NamedCurves.getName(gostParams.getPublicKeyParamSet()));
//
// ECCurve curve = spec.getCurve();
// EllipticCurve ellipticCurve = EC5Util.convertCurve(curve, spec.getSeed());
//
// this.q = curve.createPoint(new BigInteger(1, x), new BigInteger(1, y), false);
//
// ecSpec = new ECNamedCurveSpec(
// ECGOST3410NamedCurves.getName(gostParams.getPublicKeyParamSet()),
// ellipticCurve,
// new ECPoint(
// spec.getG().getX().toBigInteger(),
// spec.getG().getY().toBigInteger()),
// spec.getN(), spec.getH());
//
// }
// else
// END android-removed
{
X962Parameters params = new X962Parameters((ASN1Primitive) info.getAlgorithmId().getParameters());
ECCurve curve;
EllipticCurve ellipticCurve;
if (params.isNamedCurve()) {
ASN1ObjectIdentifier oid = (ASN1ObjectIdentifier) params.getParameters();
X9ECParameters ecP = ECUtil.getNamedCurveByOid(oid);
curve = ecP.getCurve();
ellipticCurve = EC5Util.convertCurve(curve, ecP.getSeed());
ecSpec = new ECNamedCurveSpec(ECUtil.getCurveName(oid), ellipticCurve, new ECPoint(ecP.getG().getX().toBigInteger(), ecP.getG().getY().toBigInteger()), ecP.getN(), ecP.getH());
} else if (params.isImplicitlyCA()) {
ecSpec = null;
curve = BouncyCastleProvider.CONFIGURATION.getEcImplicitlyCa().getCurve();
} else {
X9ECParameters ecP = X9ECParameters.getInstance(params.getParameters());
curve = ecP.getCurve();
ellipticCurve = EC5Util.convertCurve(curve, ecP.getSeed());
this.ecSpec = new ECParameterSpec(ellipticCurve, new ECPoint(ecP.getG().getX().toBigInteger(), ecP.getG().getY().toBigInteger()), ecP.getN(), ecP.getH().intValue());
}
DERBitString bits = info.getPublicKeyData();
byte[] data = bits.getBytes();
ASN1OctetString key = new DEROctetString(data);
//
if (data[0] == 0x04 && data[1] == data.length - 2 && (data[2] == 0x02 || data[2] == 0x03)) {
int qLength = new X9IntegerConverter().getByteLength(curve);
if (qLength >= data.length - 3) {
try {
key = (ASN1OctetString) ASN1Primitive.fromByteArray(data);
} catch (IOException ex) {
throw new IllegalArgumentException("error recovering public key");
}
}
}
X9ECPoint derQ = new X9ECPoint(curve, key);
this.q = derQ.getPoint();
}
}
use of org.spongycastle.asn1.x9.X9IntegerConverter in project SmartMesh_Android by SmartMeshFoundation.
the class Sign2 method decompressKey.
/**
* Decompress a compressed public key (x co-ord and low-bit of y-coord).
*/
private static ECPoint decompressKey(BigInteger xBN, boolean yBit) {
X9IntegerConverter x9 = new X9IntegerConverter();
byte[] compEnc = x9.integerToBytes(xBN, 1 + x9.getByteLength(CURVE.getCurve()));
compEnc[0] = (byte) (yBit ? 0x03 : 0x02);
return CURVE.getCurve().decodePoint(compEnc);
}
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