68 lines
3.1 KiB
Java
68 lines
3.1 KiB
Java
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package org.bouncycastle.crypto.engines;
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import java.math.BigInteger;
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import java.security.SecureRandom;
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import org.bouncycastle.crypto.AsymmetricBlockCipher;
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import org.bouncycastle.crypto.CipherParameters;
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import org.bouncycastle.crypto.params.ParametersWithRandom;
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import org.bouncycastle.crypto.params.RSAKeyParameters;
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import org.bouncycastle.crypto.params.RSAPrivateCrtKeyParameters;
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import org.bouncycastle.util.BigIntegers;
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/* loaded from: classes6.dex */
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public class RSABlindedEngine implements AsymmetricBlockCipher {
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private static final BigInteger ONE = BigInteger.valueOf(1);
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private RSACoreEngine core = new RSACoreEngine();
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private RSAKeyParameters key;
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private SecureRandom random;
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@Override // org.bouncycastle.crypto.AsymmetricBlockCipher
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public byte[] processBlock(byte[] bArr, int i, int i2) {
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BigInteger processBlock;
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RSAPrivateCrtKeyParameters rSAPrivateCrtKeyParameters;
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BigInteger publicExponent;
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if (this.key == null) {
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throw new IllegalStateException("RSA engine not initialised");
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}
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BigInteger convertInput = this.core.convertInput(bArr, i, i2);
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RSAKeyParameters rSAKeyParameters = this.key;
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if (!(rSAKeyParameters instanceof RSAPrivateCrtKeyParameters) || (publicExponent = (rSAPrivateCrtKeyParameters = (RSAPrivateCrtKeyParameters) rSAKeyParameters).getPublicExponent()) == null) {
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processBlock = this.core.processBlock(convertInput);
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} else {
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BigInteger modulus = rSAPrivateCrtKeyParameters.getModulus();
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BigInteger bigInteger = ONE;
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BigInteger createRandomInRange = BigIntegers.createRandomInRange(bigInteger, modulus.subtract(bigInteger), this.random);
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processBlock = this.core.processBlock(createRandomInRange.modPow(publicExponent, modulus).multiply(convertInput).mod(modulus)).multiply(createRandomInRange.modInverse(modulus)).mod(modulus);
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if (!convertInput.equals(processBlock.modPow(publicExponent, modulus))) {
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throw new IllegalStateException("RSA engine faulty decryption/signing detected");
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}
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}
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return this.core.convertOutput(processBlock);
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}
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@Override // org.bouncycastle.crypto.AsymmetricBlockCipher
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public void init(boolean z, CipherParameters cipherParameters) {
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SecureRandom secureRandom;
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this.core.init(z, cipherParameters);
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if (cipherParameters instanceof ParametersWithRandom) {
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ParametersWithRandom parametersWithRandom = (ParametersWithRandom) cipherParameters;
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this.key = (RSAKeyParameters) parametersWithRandom.getParameters();
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secureRandom = parametersWithRandom.getRandom();
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} else {
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this.key = (RSAKeyParameters) cipherParameters;
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secureRandom = new SecureRandom();
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}
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this.random = secureRandom;
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}
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@Override // org.bouncycastle.crypto.AsymmetricBlockCipher
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public int getOutputBlockSize() {
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return this.core.getOutputBlockSize();
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}
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@Override // org.bouncycastle.crypto.AsymmetricBlockCipher
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public int getInputBlockSize() {
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return this.core.getInputBlockSize();
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}
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}
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