what-the-bank/sources/org/bouncycastle/crypto/generators/SCrypt.java

package org.bouncycastle.crypto.generators;

import org.bouncycastle.crypto.digests.SHA256Digest;
import org.bouncycastle.crypto.engines.Salsa20Engine;
import org.bouncycastle.crypto.params.KeyParameter;
import org.bouncycastle.util.Arrays;
import org.bouncycastle.util.Pack;

/* loaded from: classes6.dex */
public class SCrypt {
    public static byte[] generate(byte[] bArr, byte[] bArr2, int i, int i2, int i3, int i4) {
        if (bArr == null) {
            throw new IllegalArgumentException("Passphrase P must be provided.");
        }
        if (bArr2 == null) {
            throw new IllegalArgumentException("Salt S must be provided.");
        }
        if (i <= 1) {
            throw new IllegalArgumentException("Cost parameter N must be > 1.");
        }
        if (i2 == 1 && i > 65536) {
            throw new IllegalArgumentException("Cost parameter N must be > 1 and < 65536.");
        }
        if (i2 <= 0) {
            throw new IllegalArgumentException("Block size r must be >= 1.");
        }
        int i5 = Integer.MAX_VALUE / (i2 << 10);
        if (i3 > 0 && i3 <= i5) {
            if (i4 > 0) {
                return MFcrypt(bArr, bArr2, i, i2, i3, i4);
            }
            throw new IllegalArgumentException("Generated key length dkLen must be >= 1.");
        }
        StringBuilder sb = new StringBuilder("Parallelisation parameter p must be >= 1 and <= ");
        sb.append(i5);
        sb.append(" (based on block size r of ");
        sb.append(i2);
        sb.append(")");
        throw new IllegalArgumentException(sb.toString());
    }

    private static void Xor(int[] iArr, int[] iArr2, int i, int[] iArr3) {
        for (int length = iArr3.length - 1; length >= 0; length--) {
            iArr3[length] = iArr[length] ^ iArr2[i + length];
        }
    }

    private static byte[] SingleIterationPBKDF2(byte[] bArr, byte[] bArr2, int i) {
        PKCS5S2ParametersGenerator pKCS5S2ParametersGenerator = new PKCS5S2ParametersGenerator(new SHA256Digest());
        pKCS5S2ParametersGenerator.init(bArr, bArr2, 1);
        return ((KeyParameter) pKCS5S2ParametersGenerator.generateDerivedMacParameters(i << 3)).getKey();
    }

    private static void SMix(int[] iArr, int i, int i2, int i3) {
        int i4 = i3 << 5;
        int[] iArr2 = new int[16];
        int[] iArr3 = new int[16];
        int[] iArr4 = new int[i4];
        int[] iArr5 = new int[i4];
        int[][] iArr6 = new int[i2];
        try {
            System.arraycopy(iArr, i, iArr5, 0, i4);
            for (int i5 = 0; i5 < i2; i5++) {
                iArr6[i5] = Arrays.clone(iArr5);
                BlockMix(iArr5, iArr2, iArr3, iArr4, i3);
            }
            for (int i6 = 0; i6 < i2; i6++) {
                Xor(iArr5, iArr6[iArr5[i4 - 16] & (i2 - 1)], 0, iArr5);
                BlockMix(iArr5, iArr2, iArr3, iArr4, i3);
            }
            System.arraycopy(iArr5, 0, iArr, i, i4);
            ClearAll(iArr6);
            ClearAll(new int[][]{iArr5, iArr2, iArr3, iArr4});
        } catch (Throwable th) {
            ClearAll(iArr6);
            ClearAll(new int[][]{iArr5, iArr2, iArr3, iArr4});
            throw th;
        }
    }

    private static byte[] MFcrypt(byte[] bArr, byte[] bArr2, int i, int i2, int i3, int i4) {
        int i5 = i2 << 7;
        byte[] SingleIterationPBKDF2 = SingleIterationPBKDF2(bArr, bArr2, i3 * i5);
        int[] iArr = null;
        try {
            int length = SingleIterationPBKDF2.length >>> 2;
            iArr = new int[length];
            Pack.littleEndianToInt(SingleIterationPBKDF2, 0, iArr);
            for (int i6 = 0; i6 < length; i6 += i5 >>> 2) {
                SMix(iArr, i6, i, i2);
            }
            Pack.intToLittleEndian(iArr, SingleIterationPBKDF2, 0);
            return SingleIterationPBKDF2(bArr, SingleIterationPBKDF2, i4);
        } finally {
            Clear(SingleIterationPBKDF2);
            Clear(iArr);
        }
    }

    private static void ClearAll(int[][] iArr) {
        for (int[] iArr2 : iArr) {
            Clear(iArr2);
        }
    }

    private static void Clear(int[] iArr) {
        if (iArr != null) {
            Arrays.fill(iArr, 0);
        }
    }

    private static void Clear(byte[] bArr) {
        if (bArr != null) {
            Arrays.fill(bArr, (byte) 0);
        }
    }

    private static void BlockMix(int[] iArr, int[] iArr2, int[] iArr3, int[] iArr4, int i) {
        System.arraycopy(iArr, iArr.length - 16, iArr2, 0, 16);
        int length = iArr.length;
        int i2 = 0;
        int i3 = 0;
        for (int i4 = i << 1; i4 > 0; i4--) {
            Xor(iArr2, iArr, i2, iArr3);
            Salsa20Engine.salsaCore(8, iArr3, iArr2);
            System.arraycopy(iArr2, 0, iArr4, i3, 16);
            i3 = ((length >>> 1) + i2) - i3;
            i2 += 16;
        }
        System.arraycopy(iArr4, 0, iArr, 0, iArr4.length);
    }
}