Examples with X9IntegerConverter org.spongycastle.asn1.x9.X9IntegerConverter used on opensource projects

Example 11 with X9IntegerConverter

use of org.spongycastle.asn1.x9.X9IntegerConverter in project web3sdk by FISCO-BCOS.

the class Sign 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);
}

Example 12 with X9IntegerConverter

use of org.spongycastle.asn1.x9.X9IntegerConverter in project aion by aionnetwork.

the class ECKeySecp256k1 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);
}

Example 13 with X9IntegerConverter

use of org.spongycastle.asn1.x9.X9IntegerConverter in project keycloak by keycloak.

the class ECDSASignatureProvider method asn1derToConcatenatedRS.

public static byte[] asn1derToConcatenatedRS(final byte[] derEncodedSignatureValue, int signLength) throws IOException {
    int len = signLength / 2;
    ASN1InputStream asn1InputStream = new ASN1InputStream(derEncodedSignatureValue);
    ASN1Primitive asn1Primitive = asn1InputStream.readObject();
    asn1InputStream.close();
    ASN1Sequence asn1Sequence = (ASN1Sequence.getInstance(asn1Primitive));
    ASN1Integer rASN1 = (ASN1Integer) asn1Sequence.getObjectAt(0);
    ASN1Integer sASN1 = (ASN1Integer) asn1Sequence.getObjectAt(1);
    X9IntegerConverter x9IntegerConverter = new X9IntegerConverter();
    byte[] r = x9IntegerConverter.integerToBytes(rASN1.getValue(), len);
    byte[] s = x9IntegerConverter.integerToBytes(sASN1.getValue(), len);
    byte[] concatenatedSignatureValue = new byte[signLength];
    System.arraycopy(r, 0, concatenatedSignatureValue, 0, len);
    System.arraycopy(s, 0, concatenatedSignatureValue, len, len);
    return concatenatedSignatureValue;
}