74 lines
3.2 KiB
Java
74 lines
3.2 KiB
Java
|
package org.bouncycastle.crypto.kems;
|
||
|
|
|
||
|
|
import java.math.BigInteger;
|
||
|
|
import java.security.SecureRandom;
|
||
|
|
import org.bouncycastle.crypto.CipherParameters;
|
||
|
|
import org.bouncycastle.crypto.DerivationFunction;
|
||
|
|
import org.bouncycastle.crypto.KeyEncapsulation;
|
||
|
|
import org.bouncycastle.crypto.params.KDFParameters;
|
||
|
|
import org.bouncycastle.crypto.params.KeyParameter;
|
||
|
|
import org.bouncycastle.crypto.params.RSAKeyParameters;
|
||
|
|
import org.bouncycastle.util.BigIntegers;
|
||
|
|
|
||
|
|
/* loaded from: classes6.dex */
|
||
|
|
public class RSAKeyEncapsulation implements KeyEncapsulation {
|
||
|
|
private DerivationFunction kdf;
|
||
|
|
private RSAKeyParameters key;
|
||
|
|
private SecureRandom rnd;
|
||
|
|
private static final BigInteger ZERO = BigInteger.valueOf(0);
|
||
|
|
private static final BigInteger ONE = BigInteger.valueOf(1);
|
||
|
|
|
||
|
|
@Override // org.bouncycastle.crypto.KeyEncapsulation
|
||
|
|
public void init(CipherParameters cipherParameters) throws IllegalArgumentException {
|
||
|
|
if (!(cipherParameters instanceof RSAKeyParameters)) {
|
||
|
|
throw new IllegalArgumentException("RSA key required");
|
||
|
|
}
|
||
|
|
this.key = (RSAKeyParameters) cipherParameters;
|
||
|
|
}
|
||
|
|
|
||
|
|
protected KeyParameter generateKey(BigInteger bigInteger, BigInteger bigInteger2, int i) {
|
||
|
|
this.kdf.init(new KDFParameters(BigIntegers.asUnsignedByteArray((bigInteger.bitLength() + 7) / 8, bigInteger2), null));
|
||
|
|
byte[] bArr = new byte[i];
|
||
|
|
this.kdf.generateBytes(bArr, 0, i);
|
||
|
|
return new KeyParameter(bArr);
|
||
|
|
}
|
||
|
|
|
||
|
|
@Override // org.bouncycastle.crypto.KeyEncapsulation
|
||
|
|
public CipherParameters encrypt(byte[] bArr, int i, int i2) throws IllegalArgumentException {
|
||
|
|
if (this.key.isPrivate()) {
|
||
|
|
throw new IllegalArgumentException("Public key required for encryption");
|
||
|
|
}
|
||
|
|
BigInteger modulus = this.key.getModulus();
|
||
|
|
BigInteger exponent = this.key.getExponent();
|
||
|
|
BigInteger createRandomInRange = BigIntegers.createRandomInRange(ZERO, modulus.subtract(ONE), this.rnd);
|
||
|
|
byte[] asUnsignedByteArray = BigIntegers.asUnsignedByteArray((modulus.bitLength() + 7) / 8, createRandomInRange.modPow(exponent, modulus));
|
||
|
|
System.arraycopy(asUnsignedByteArray, 0, bArr, i, asUnsignedByteArray.length);
|
||
|
|
return generateKey(modulus, createRandomInRange, i2);
|
||
|
|
}
|
||
|
|
|
||
|
|
public CipherParameters encrypt(byte[] bArr, int i) {
|
||
|
|
return encrypt(bArr, 0, i);
|
||
|
|
}
|
||
|
|
|
||
|
|
@Override // org.bouncycastle.crypto.KeyEncapsulation
|
||
|
|
public CipherParameters decrypt(byte[] bArr, int i, int i2, int i3) throws IllegalArgumentException {
|
||
|
|
if (!this.key.isPrivate()) {
|
||
|
|
throw new IllegalArgumentException("Private key required for decryption");
|
||
|
|
}
|
||
|
|
BigInteger modulus = this.key.getModulus();
|
||
|
|
BigInteger exponent = this.key.getExponent();
|
||
|
|
byte[] bArr2 = new byte[i2];
|
||
|
|
System.arraycopy(bArr, i, bArr2, 0, i2);
|
||
|
|
return generateKey(modulus, new BigInteger(1, bArr2).modPow(exponent, modulus), i3);
|
||
|
|
}
|
||
|
|
|
||
|
|
public CipherParameters decrypt(byte[] bArr, int i) {
|
||
|
|
return decrypt(bArr, 0, bArr.length, i);
|
||
|
|
}
|
||
|
|
|
||
|
|
public RSAKeyEncapsulation(DerivationFunction derivationFunction, SecureRandom secureRandom) {
|
||
|
|
this.kdf = derivationFunction;
|
||
|
|
this.rnd = secureRandom;
|
||
|
|
}
|
||
|
|
}
|