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using System;
using System.IO;
using Org.BouncyCastle.Asn1;
using Org.BouncyCastle.Asn1.Pkcs;
using Org.BouncyCastle.Asn1.X509;
namespace Org.BouncyCastle.Pkcs
{
/**
* Utility class for reencoding PKCS#12 files to definite length.
*/
public class Pkcs12Utilities
{
/**
* Just re-encode the outer layer of the PKCS#12 file to definite length encoding.
*
* @param berPKCS12File - original PKCS#12 file
* @return a byte array representing the DER encoding of the PFX structure
* @throws IOException
*/
public static byte[] ConvertToDefiniteLength(
byte[] berPkcs12File)
{
Pfx pfx = new Pfx(Asn1Sequence.GetInstance(Asn1Object.FromByteArray(berPkcs12File)));
return pfx.GetEncoded(Asn1Encodable.Der);
}
/**
* Re-encode the PKCS#12 structure to definite length encoding at the inner layer
* as well, recomputing the MAC accordingly.
*
* @param berPKCS12File - original PKCS12 file.
* @param provider - provider to use for MAC calculation.
* @return a byte array representing the DER encoding of the PFX structure.
* @throws IOException on parsing, encoding errors.
*/
public static byte[] ConvertToDefiniteLength(
byte[] berPkcs12File,
char[] passwd)
{
Pfx pfx = new Pfx(Asn1Sequence.GetInstance(Asn1Object.FromByteArray(berPkcs12File)));
ContentInfo info = pfx.AuthSafe;
Asn1OctetString content = Asn1OctetString.GetInstance(info.Content);
Asn1Object obj = Asn1Object.FromByteArray(content.GetOctets());
info = new ContentInfo(info.ContentType, new DerOctetString(obj.GetEncoded(Asn1Encodable.Der)));
MacData mData = pfx.MacData;
try
{
int itCount = mData.IterationCount.IntValue;
byte[] data = Asn1OctetString.GetInstance(info.Content).GetOctets();
byte[] res = Pkcs12Store.CalculatePbeMac(
mData.Mac.AlgorithmID.Algorithm, mData.GetSalt(), itCount, passwd, false, data);
AlgorithmIdentifier algId = new AlgorithmIdentifier(
mData.Mac.AlgorithmID.Algorithm, DerNull.Instance);
DigestInfo dInfo = new DigestInfo(algId, res);
mData = new MacData(dInfo, mData.GetSalt(), itCount);
}
catch (Exception e)
{
throw new IOException("error constructing MAC: " + e.ToString());
}
pfx = new Pfx(info, mData);
return pfx.GetEncoded(Asn1Encodable.Der);
}
}
}
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