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The Bouncy Castle Crypto package is a Java implementation of cryptographic algorithms. This jar contains JCE provider and lightweight API for the Bouncy Castle Cryptography APIs for JDK 1.5 to JDK 1.8 with debug enabled.
package org.bouncycastle.asn1.misc;
import java.math.BigInteger;
import org.bouncycastle.asn1.ASN1EncodableVector;
import org.bouncycastle.asn1.ASN1Integer;
import org.bouncycastle.asn1.ASN1Object;
import org.bouncycastle.asn1.ASN1OctetString;
import org.bouncycastle.asn1.ASN1Primitive;
import org.bouncycastle.asn1.ASN1Sequence;
import org.bouncycastle.asn1.DEROctetString;
import org.bouncycastle.asn1.DERSequence;
import org.bouncycastle.util.Arrays;
/**
* RFC 7914 scrypt parameters.
*
*
* scrypt-params ::= SEQUENCE {
* salt OCTET STRING,
* costParameter INTEGER (1..MAX),
* blockSize INTEGER (1..MAX),
* parallelizationParameter INTEGER (1..MAX),
* keyLength INTEGER (1..MAX) OPTIONAL
* }
*
*/
public class ScryptParams
extends ASN1Object
{
private final byte[] salt;
private final BigInteger costParameter;
private final BigInteger blockSize;
private final BigInteger parallelizationParameter;
private final BigInteger keyLength;
public ScryptParams(byte[] salt, int costParameter, int blockSize, int parallelizationParameter)
{
this(salt, BigInteger.valueOf(costParameter), BigInteger.valueOf(blockSize), BigInteger.valueOf(parallelizationParameter), null);
}
public ScryptParams(byte[] salt, int costParameter, int blockSize, int parallelizationParameter, int keyLength)
{
this(salt, BigInteger.valueOf(costParameter), BigInteger.valueOf(blockSize), BigInteger.valueOf(parallelizationParameter), BigInteger.valueOf(keyLength));
}
/**
* Base constructor.
*
* @param salt salt value
* @param costParameter specifies the CPU/Memory cost parameter N
* @param blockSize block size parameter r
* @param parallelizationParameter parallelization parameter
* @param keyLength length of key to be derived (in octects)
*/
public ScryptParams(byte[] salt, BigInteger costParameter, BigInteger blockSize, BigInteger parallelizationParameter, BigInteger keyLength)
{
this.salt = Arrays.clone(salt);
this.costParameter = costParameter;
this.blockSize = blockSize;
this.parallelizationParameter = parallelizationParameter;
this.keyLength = keyLength;
}
public static ScryptParams getInstance(
Object o)
{
if (o instanceof ScryptParams)
{
return (ScryptParams)o;
}
else if (o != null)
{
return new ScryptParams(ASN1Sequence.getInstance(o));
}
return null;
}
private ScryptParams(ASN1Sequence seq)
{
if (seq.size() != 4 && seq.size() != 5)
{
throw new IllegalArgumentException("invalid sequence: size = " + seq.size());
}
this.salt = Arrays.clone(ASN1OctetString.getInstance(seq.getObjectAt(0)).getOctets());
this.costParameter = ASN1Integer.getInstance(seq.getObjectAt(1)).getValue();
this.blockSize = ASN1Integer.getInstance(seq.getObjectAt(2)).getValue();
this.parallelizationParameter = ASN1Integer.getInstance(seq.getObjectAt(3)).getValue();
if (seq.size() == 5)
{
this.keyLength = ASN1Integer.getInstance(seq.getObjectAt(4)).getValue();
}
else
{
this.keyLength = null;
}
}
public byte[] getSalt()
{
return Arrays.clone(salt);
}
public BigInteger getCostParameter()
{
return costParameter;
}
public BigInteger getBlockSize()
{
return blockSize;
}
public BigInteger getParallelizationParameter()
{
return parallelizationParameter;
}
/**
* Return the length in octets for the derived key.
*
* @return length for key to be derived (in octets)
*/
public BigInteger getKeyLength()
{
return keyLength;
}
public ASN1Primitive toASN1Primitive()
{
ASN1EncodableVector v = new ASN1EncodableVector();
v.add(new DEROctetString(salt));
v.add(new ASN1Integer(costParameter));
v.add(new ASN1Integer(blockSize));
v.add(new ASN1Integer(parallelizationParameter));
if (keyLength != null)
{
v.add(new ASN1Integer(keyLength));
}
return new DERSequence(v);
}
}
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