/** * Output this ECKey as an ASN.1 encoded private key, as understood by OpenSSL or used by the BitCoin reference * implementation in its wallet storage format. */ public byte[] toASN1() { try { ByteArrayOutputStream baos = new ByteArrayOutputStream(400); // ASN1_SEQUENCE(EC_PRIVATEKEY) = { // ASN1_SIMPLE(EC_PRIVATEKEY, version, LONG), // ASN1_SIMPLE(EC_PRIVATEKEY, privateKey, ASN1_OCTET_STRING), // ASN1_EXP_OPT(EC_PRIVATEKEY, parameters, ECPKPARAMETERS, 0), // ASN1_EXP_OPT(EC_PRIVATEKEY, publicKey, ASN1_BIT_STRING, 1) // } ASN1_SEQUENCE_END(EC_PRIVATEKEY) DERSequenceGenerator seq = new DERSequenceGenerator(baos); seq.addObject(new ASN1Integer(1)); // version seq.addObject(new DEROctetString(priv.toByteArray())); seq.addObject(new DERTaggedObject(0, SECNamedCurves.getByName("secp256k1").toASN1Primitive())); seq.addObject(new DERTaggedObject(1, new DERBitString(getPubKey()))); seq.close(); return baos.toByteArray(); } catch (IOException e) { throw new RuntimeException(e); // Cannot happen, writing to memory stream. } }
static ECDomainParameters getECParameters(int namedCurve) { int index = namedCurve - 1; if (index < 0 || index >= curveNames.length) { return null; } String curveName = curveNames[index]; // Lazily created the first time a particular curve is accessed X9ECParameters ecP = SECNamedCurves.getByName(curveName); if (ecP == null) { return null; } // It's a bit inefficient to do this conversion every time return new ECDomainParameters(ecP.getCurve(), ecP.getG(), ecP.getN(), ecP.getH(), ecP.getSeed()); } }
ecP = SECNamedCurves.getByName(name);
public static X9ECParameters getNamedCurveByName( String curveName) { X9ECParameters params = CustomNamedCurves.getByName(curveName); if (params == null) { params = X962NamedCurves.getByName(curveName); if (params == null) { params = SECNamedCurves.getByName(curveName); } if (params == null) { params = NISTNamedCurves.getByName(curveName); } if (params == null) { params = TeleTrusTNamedCurves.getByName(curveName); } if (params == null) { params = ANSSINamedCurves.getByName(curveName); } if (params == null) { params = GMNamedCurves.getByName(curveName); } } return params; }
X9ECParameters params = SECNamedCurves.getByName("secp256k1"); ECDomainParameters CURVE = new ECDomainParameters(params.getCurve(), params.getG(), params.getN(), params.getH()); BigInteger HALF_CURVE_ORDER = params.getN().shiftRight(1);
public static boolean verify(byte[] publicKey, byte[] signature, byte[] msg) { X9ECParameters params = SECNamedCurves.getByName("secp256k1"); ECDomainParameters EC_PARAMS = new ECDomainParameters(params.getCurve(), params.getG(), params.getN(), params.getH()); synchronized (EC_PARAMS) { boolean valid; ECDSASigner signerVer = new ECDSASigner(new HMacDSAKCalculator(new SHA256Digest())); try { ECPublicKeyParameters pubKey = new ECPublicKeyParameters(EC_PARAMS.getCurve().decodePoint(publicKey), EC_PARAMS); signerVer.init(false, pubKey); ASN1InputStream derSigStream = new ASN1InputStream(signature); DLSequence seq = (DLSequence) derSigStream.readObject(); BigInteger r = ((ASN1Integer) seq.getObjectAt(0)).getPositiveValue(); BigInteger s = ((ASN1Integer) seq.getObjectAt(1)).getPositiveValue(); derSigStream.close(); valid = signerVer.verifySignature(msg, r, s); } catch (IOException e) { throw new RuntimeException(); } return valid; } } }
ecP = SECNamedCurves.getByName(name); if (ecP == null)
if (ecP == null) ecP = SECNamedCurves.getByName(curveName); if (ecP == null)