Examples with Sm2Cipher com.github.zhenwei.core.asn1.pkcs.Sm2Cipher used on opensource projects

Example 1 with Sm2Cipher

use of com.github.zhenwei.core.asn1.pkcs.Sm2Cipher in project LinLong-Java by zhenwei1108.

the class SM2Engine method decryptGm.

private byte[] decryptGm(byte[] in, int inOff, int inLen) throws InvalidCipherTextException {
    Sm2Cipher sm2Cipher = Sm2Cipher.getInstance(in).setMode(mode);
    ASN1Integer x = sm2Cipher.getX();
    ASN1Integer y = sm2Cipher.getY();
    ECPoint c1P = ecParams.getCurve().createPoint(x.getValue(), y.getValue());
    byte[] c1 = c1P.getEncoded(false);
    ECPoint s = c1P.multiply(ecParams.getH());
    if (s.isInfinity()) {
        throw new InvalidCipherTextException("[h]C1 at infinity");
    }
    c1P = c1P.multiply(((ECPrivateKeyParameters) ecKey).getD()).normalize();
    byte[] c2 = sm2Cipher.getCipher().getOctets();
    kdf(digest, c1P, c2);
    byte[] c3 = new byte[digest.getDigestSize()];
    addFieldElement(digest, c1P.getAffineXCoord());
    digest.update(c2, 0, c2.length);
    addFieldElement(digest, c1P.getAffineYCoord());
    digest.doFinal(c3, 0);
    int check = 0;
    byte[] hash = sm2Cipher.getHash().getOctets();
    for (int i = 0; i != c3.length; i++) {
        check |= c3[i] ^ hash[i];
    }
    Arrays.fill(c1, (byte) 0);
    Arrays.fill(c3, (byte) 0);
    if (check != 0) {
        Arrays.fill(c2, (byte) 0);
        throw new InvalidCipherTextException("invalid cipher text");
    }
    return c2;
}

Example 2 with Sm2Cipher

use of com.github.zhenwei.core.asn1.pkcs.Sm2Cipher in project LinLong-Java by zhenwei1108.

the class SM2Engine method encryptGm.

// todo 实现SM2Cipher
private byte[] encryptGm(byte[] in, int inOff, int inLen) throws IOException {
    byte[] cipher = new byte[inLen];
    System.arraycopy(in, inOff, cipher, 0, cipher.length);
    ECMultiplier multiplier = createBasePointMultiplier();
    ECPoint kPB;
    BigInteger x, y;
    do {
        BigInteger k = nextK();
        ECPoint c1P = multiplier.multiply(ecParams.getG(), k).normalize();
        // x , y
        x = c1P.getAffineXCoord().toBigInteger();
        y = c1P.getAffineYCoord().toBigInteger();
        kPB = ((ECPublicKeyParameters) ecKey).getQ().multiply(k).normalize();
        kdf(digest, kPB, cipher);
    } while (notEncrypted(cipher, in, inOff));
    byte[] hash = new byte[digest.getDigestSize()];
    addFieldElement(digest, kPB.getAffineXCoord());
    digest.update(in, inOff, inLen);
    addFieldElement(digest, kPB.getAffineYCoord());
    digest.doFinal(hash, 0);
    return new Sm2Cipher(x, y, hash, cipher).setMode(mode).getEncoded(ASN1Encoding.DER);
}