77 lines
2.6 KiB
Java
77 lines
2.6 KiB
Java
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package org.bouncycastle.crypto.generators;
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import org.bouncycastle.crypto.DataLengthException;
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import org.bouncycastle.crypto.DerivationFunction;
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import org.bouncycastle.crypto.DerivationParameters;
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import org.bouncycastle.crypto.Digest;
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import org.bouncycastle.crypto.params.MGFParameters;
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/* loaded from: classes6.dex */
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public class MGF1BytesGenerator implements DerivationFunction {
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private Digest digest;
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private int hLen;
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private byte[] seed;
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@Override // org.bouncycastle.crypto.DerivationFunction
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public void init(DerivationParameters derivationParameters) {
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if (!(derivationParameters instanceof MGFParameters)) {
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throw new IllegalArgumentException("MGF parameters required for MGF1Generator");
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}
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this.seed = ((MGFParameters) derivationParameters).getSeed();
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}
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public Digest getDigest() {
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return this.digest;
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}
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@Override // org.bouncycastle.crypto.DerivationFunction
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public int generateBytes(byte[] bArr, int i, int i2) throws DataLengthException, IllegalArgumentException {
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int i3;
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if (bArr.length - i2 < i) {
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throw new DataLengthException("output buffer too small");
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}
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byte[] bArr2 = new byte[this.hLen];
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byte[] bArr3 = new byte[4];
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this.digest.reset();
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if (i2 > this.hLen) {
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i3 = 0;
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do {
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ItoOSP(i3, bArr3);
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Digest digest = this.digest;
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byte[] bArr4 = this.seed;
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digest.update(bArr4, 0, bArr4.length);
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this.digest.update(bArr3, 0, 4);
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this.digest.doFinal(bArr2, 0);
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int i4 = this.hLen;
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System.arraycopy(bArr2, 0, bArr, (i3 * i4) + i, i4);
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i3++;
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} while (i3 < i2 / this.hLen);
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} else {
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i3 = 0;
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}
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if (this.hLen * i3 < i2) {
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ItoOSP(i3, bArr3);
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Digest digest2 = this.digest;
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byte[] bArr5 = this.seed;
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digest2.update(bArr5, 0, bArr5.length);
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this.digest.update(bArr3, 0, 4);
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this.digest.doFinal(bArr2, 0);
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int i5 = i3 * this.hLen;
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System.arraycopy(bArr2, 0, bArr, i + i5, i2 - i5);
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}
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return i2;
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}
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private void ItoOSP(int i, byte[] bArr) {
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bArr[0] = (byte) (i >>> 24);
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bArr[1] = (byte) (i >>> 16);
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bArr[2] = (byte) (i >>> 8);
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bArr[3] = (byte) i;
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}
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public MGF1BytesGenerator(Digest digest) {
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this.digest = digest;
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this.hLen = digest.getDigestSize();
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}
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}
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