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Example 6 with BCECPrivateKey

use of org.spongycastle.jcajce.provider.asymmetric.ec.BCECPrivateKey in project toshi-android-client by toshiapp.

the class ECKey method doSign.

/**
 * Signs the given hash and returns the R and S components as BigIntegers
 * and put them in ECDSASignature
 *
 * @param input to sign
 * @return ECDSASignature signature that contains the R and S components
 */
public ECDSASignature doSign(byte[] input) {
    if (input.length != 32) {
        throw new IllegalArgumentException("Expected 32 byte input to ECDSA signature, not " + input.length);
    }
    // No decryption of private key required.
    if (privKey == null)
        throw new MissingPrivateKeyException();
    if (privKey instanceof BCECPrivateKey) {
        ECDSASigner signer = new ECDSASigner(new HMacDSAKCalculator(new SHA256Digest()));
        ECPrivateKeyParameters privKeyParams = new ECPrivateKeyParameters(((BCECPrivateKey) privKey).getD(), CURVE);
        signer.init(true, privKeyParams);
        BigInteger[] components = signer.generateSignature(input);
        return new ECDSASignature(components[0], components[1]).toCanonicalised();
    } else {
        try {
            final Signature ecSig = ECSignatureFactory.getRawInstance(provider);
            ecSig.initSign(privKey);
            ecSig.update(input);
            final byte[] derSignature = ecSig.sign();
            return ECDSASignature.decodeFromDER(derSignature).toCanonicalised();
        } catch (SignatureException | InvalidKeyException ex) {
            throw new RuntimeException("ECKey signing error", ex);
        }
    }
}
Also used : ECDSASigner(org.spongycastle.crypto.signers.ECDSASigner) SignatureException(java.security.SignatureException) InvalidKeyException(java.security.InvalidKeyException) BCECPrivateKey(org.spongycastle.jcajce.provider.asymmetric.ec.BCECPrivateKey) HMacDSAKCalculator(org.spongycastle.crypto.signers.HMacDSAKCalculator) ECPrivateKeyParameters(org.spongycastle.crypto.params.ECPrivateKeyParameters) SHA256Digest(org.spongycastle.crypto.digests.SHA256Digest) Signature(java.security.Signature) BigInteger(java.math.BigInteger)

Example 7 with BCECPrivateKey

use of org.spongycastle.jcajce.provider.asymmetric.ec.BCECPrivateKey in project toshi-android-client by toshiapp.

the class ECKey method decryptAES.

/**
 * Decrypt cipher by AES in SIC(also know as CTR) mode
 *
 * @param cipher -proper cipher
 * @return decrypted cipher, equal length to the cipher.
 * @deprecated should not use EC private scalar value as an AES key
 */
public byte[] decryptAES(byte[] cipher) {
    if (privKey == null) {
        throw new MissingPrivateKeyException();
    }
    if (!(privKey instanceof BCECPrivateKey)) {
        throw new UnsupportedOperationException("Cannot use the private key as an AES key");
    }
    AESFastEngine engine = new AESFastEngine();
    SICBlockCipher ctrEngine = new SICBlockCipher(engine);
    KeyParameter key = new KeyParameter(BigIntegers.asUnsignedByteArray(((BCECPrivateKey) privKey).getD()));
    ParametersWithIV params = new ParametersWithIV(key, new byte[16]);
    ctrEngine.init(false, params);
    int i = 0;
    byte[] out = new byte[cipher.length];
    while (i < cipher.length) {
        ctrEngine.processBlock(cipher, i, out, i);
        i += engine.getBlockSize();
        if (cipher.length - i < engine.getBlockSize())
            break;
    }
    // process left bytes
    if (cipher.length - i > 0) {
        byte[] tmpBlock = new byte[16];
        System.arraycopy(cipher, i, tmpBlock, 0, cipher.length - i);
        ctrEngine.processBlock(tmpBlock, 0, tmpBlock, 0);
        System.arraycopy(tmpBlock, 0, out, i, cipher.length - i);
    }
    return out;
}
Also used : ParametersWithIV(org.spongycastle.crypto.params.ParametersWithIV) KeyParameter(org.spongycastle.crypto.params.KeyParameter) SICBlockCipher(org.spongycastle.crypto.modes.SICBlockCipher) AESFastEngine(org.spongycastle.crypto.engines.AESFastEngine) ECPoint(org.spongycastle.math.ec.ECPoint) BCECPrivateKey(org.spongycastle.jcajce.provider.asymmetric.ec.BCECPrivateKey)

Aggregations

BCECPrivateKey (org.spongycastle.jcajce.provider.asymmetric.ec.BCECPrivateKey)7 BigInteger (java.math.BigInteger)4 InvalidKeyException (java.security.InvalidKeyException)4 Signature (java.security.Signature)4 SignatureException (java.security.SignatureException)4 SHA256Digest (org.spongycastle.crypto.digests.SHA256Digest)4 ECPrivateKeyParameters (org.spongycastle.crypto.params.ECPrivateKeyParameters)4 ECDSASigner (org.spongycastle.crypto.signers.ECDSASigner)4 HMacDSAKCalculator (org.spongycastle.crypto.signers.HMacDSAKCalculator)4 AESFastEngine (org.spongycastle.crypto.engines.AESFastEngine)3 SICBlockCipher (org.spongycastle.crypto.modes.SICBlockCipher)3 KeyParameter (org.spongycastle.crypto.params.KeyParameter)3 ParametersWithIV (org.spongycastle.crypto.params.ParametersWithIV)3 ECPoint (org.spongycastle.math.ec.ECPoint)3 ISignature (org.aion.crypto.ISignature)1