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The Bouncy Castle Java APIs for CMS, PKCS, EAC, TSP, CMP, CRMF, OCSP, and certificate generation. This jar contains APIs for JDK 1.8 and up. The APIs are designed primarily to be used in conjunction with the BC LTS provider but may also be used with other providers providing cryptographic services.

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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());
    }


}