54 lines
2.2 KiB
Java
54 lines
2.2 KiB
Java
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package org.bouncycastle.crypto.engines;
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import java.math.BigInteger;
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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.RSABlindingParameters;
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import org.bouncycastle.crypto.params.RSAKeyParameters;
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/* loaded from: classes6.dex */
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public class RSABlindingEngine implements AsymmetricBlockCipher {
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private BigInteger blindingFactor;
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private RSACoreEngine core = new RSACoreEngine();
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private boolean forEncryption;
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private RSAKeyParameters key;
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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 convertInput = this.core.convertInput(bArr, i, i2);
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return this.core.convertOutput(this.forEncryption ? blindMessage(convertInput) : unblindMessage(convertInput));
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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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if (cipherParameters instanceof ParametersWithRandom) {
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cipherParameters = ((ParametersWithRandom) cipherParameters).getParameters();
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}
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RSABlindingParameters rSABlindingParameters = (RSABlindingParameters) cipherParameters;
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this.core.init(z, rSABlindingParameters.getPublicKey());
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this.forEncryption = z;
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this.key = rSABlindingParameters.getPublicKey();
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this.blindingFactor = rSABlindingParameters.getBlindingFactor();
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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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private BigInteger unblindMessage(BigInteger bigInteger) {
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BigInteger modulus = this.key.getModulus();
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return bigInteger.multiply(this.blindingFactor.modInverse(modulus)).mod(modulus);
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}
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private BigInteger blindMessage(BigInteger bigInteger) {
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return bigInteger.multiply(this.blindingFactor.modPow(this.key.getExponent(), this.key.getModulus())).mod(this.key.getModulus());
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}
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}
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