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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.crypto.util;
import java.io.IOException;
import org.bouncycastle.asn1.ASN1EncodableVector;
import org.bouncycastle.asn1.ASN1OctetString;
import org.bouncycastle.asn1.ASN1TaggedObject;
import org.bouncycastle.asn1.DERSequence;
import org.bouncycastle.asn1.DERTaggedObject;
import org.bouncycastle.asn1.x509.AlgorithmIdentifier;
/**
* Builder and holder class for preparing SP 800-56A compliant OtherInfo. The data is ultimately encoded as a DER SEQUENCE.
* Empty octet strings are used to represent nulls in compulsory fields.
*/
public class DEROtherInfo
{
/**
* Builder to create OtherInfo
*/
public static final class Builder
{
private final AlgorithmIdentifier algorithmID;
private final ASN1OctetString partyUVInfo;
private final ASN1OctetString partyVInfo;
private ASN1TaggedObject suppPubInfo;
private ASN1TaggedObject suppPrivInfo;
/**
* Create a basic builder with just the compulsory fields.
*
* @param algorithmID the algorithm associated with this invocation of the KDF.
* @param partyUInfo sender party info.
* @param partyVInfo receiver party info.
*/
public Builder(AlgorithmIdentifier algorithmID, byte[] partyUInfo, byte[] partyVInfo)
{
this.algorithmID = algorithmID;
this.partyUVInfo = DerUtil.getOctetString(partyUInfo);
this.partyVInfo = DerUtil.getOctetString(partyVInfo);
}
/**
* Add optional supplementary public info (DER tagged, implicit, 0).
*
* @param suppPubInfo supplementary public info.
* @return the current builder instance.
*/
public Builder withSuppPubInfo(byte[] suppPubInfo)
{
this.suppPubInfo = new DERTaggedObject(false, 0, DerUtil.getOctetString(suppPubInfo));
return this;
}
/**
* Add optional supplementary private info (DER tagged, implicit, 1).
*
* @param suppPrivInfo supplementary private info.
* @return the current builder instance.
*/
public Builder withSuppPrivInfo(byte[] suppPrivInfo)
{
this.suppPrivInfo = new DERTaggedObject(false, 1, DerUtil.getOctetString(suppPrivInfo));
return this;
}
/**
* Build the KTSOtherInfo.
*
* @return an KTSOtherInfo containing the data.
*/
public DEROtherInfo build()
{
ASN1EncodableVector v = new ASN1EncodableVector();
v.add(algorithmID);
v.add(partyUVInfo);
v.add(partyVInfo);
if (suppPubInfo != null)
{
v.add(suppPubInfo);
}
if (suppPrivInfo != null)
{
v.add(suppPrivInfo);
}
return new DEROtherInfo(new DERSequence(v));
}
}
private final DERSequence sequence;
private DEROtherInfo(DERSequence sequence)
{
this.sequence = sequence;
}
public byte[] getEncoded()
throws IOException
{
return sequence.getEncoded();
}
}
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