org.bouncycastle.its.ETSIRecipientInfo Maven / Gradle / Ivy

Go to download

Show more of this group Show more artifacts with this name
Show all versions of bcpkix-jdk15to18 Show documentation

The Bouncy Castle Java APIs for CMS, PKCS, EAC, TSP, CMP, CRMF, OCSP, and certificate generation. This jar contains APIs for JDK 1.5 to JDK 1.8. The APIs can be used in conjunction with a JCE/JCA provider such as the one provided with the Bouncy Castle Cryptography APIs.

There is a newer version: 1.79

Show newest version

package org.bouncycastle.its;


import org.bouncycastle.its.operator.ETSIDataDecryptor;
import org.bouncycastle.oer.its.ieee1609dot2.AesCcmCiphertext;
import org.bouncycastle.oer.its.ieee1609dot2.EncryptedData;
import org.bouncycastle.oer.its.ieee1609dot2.EncryptedDataEncryptionKey;
import org.bouncycastle.oer.its.ieee1609dot2.PKRecipientInfo;
import org.bouncycastle.oer.its.ieee1609dot2.RecipientInfo;
import org.bouncycastle.oer.its.ieee1609dot2.SymmetricCiphertext;
import org.bouncycastle.oer.its.ieee1609dot2.basetypes.EccP256CurvePoint;
import org.bouncycastle.oer.its.ieee1609dot2.basetypes.EciesP256EncryptedKey;
import org.bouncycastle.util.Arrays;

public class ETSIRecipientInfo
{
    private final RecipientInfo recipientInfo;
    private final EncryptedData encryptedData;

    public ETSIRecipientInfo(EncryptedData encryptedData, RecipientInfo recipientInfo)
    {
        this.recipientInfo = recipientInfo;
        this.encryptedData = encryptedData;
    }

    public ETSIRecipientInfo(RecipientInfo recipientInfo)
    {
        this.recipientInfo = recipientInfo;
        this.encryptedData = null;
    }

    public RecipientInfo getRecipientInfo()
    {
        return recipientInfo;
    }


    public EncryptedData getEncryptedData()
    {
        return encryptedData;
    }

    public byte[] getContent(ETSIDataDecryptor ddec)
    {
        if (SymmetricCiphertext.aes128ccm != encryptedData.getCiphertext().getChoice())
        {
            throw new IllegalArgumentException("Encrypted data is no AES 128 CCM");
        }

        AesCcmCiphertext act = AesCcmCiphertext.getInstance(encryptedData.getCiphertext().getSymmetricCiphertext());

        // Test it is the correct kind of recipient info.
        PKRecipientInfo pkRecipientInfo = PKRecipientInfo.getInstance(recipientInfo.getRecipientInfo());
        EncryptedDataEncryptionKey edec = pkRecipientInfo.getEncKey();

        EciesP256EncryptedKey key = EciesP256EncryptedKey.getInstance(edec.getEncryptedDataEncryptionKey());
        EccP256CurvePoint point = EccP256CurvePoint.getInstance(key.getV());

        // [ephemeral public key][encrypted key][tag]
        byte[] wrappedKey = Arrays.concatenate(point.getEncodedPoint(), key.getC().getOctets(), key.getT().getOctets());

        return ddec.decrypt(wrappedKey, act.getCcmCiphertext().getContent(), act.getNonce().getOctets());
    }


}