1 files changed, 77 insertions, 0 deletions
diff --git a/Crypto/src/pkcs/Pkcs12Utilities.cs b/Crypto/src/pkcs/Pkcs12Utilities.cs
new file mode 100644
index 000000000..d35c8b6a2
--- /dev/null
+++ b/Crypto/src/pkcs/Pkcs12Utilities.cs
@@ -0,0 +1,77 @@
+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.ObjectID, mData.GetSalt(), itCount, passwd, false, data);
+
+ AlgorithmIdentifier algId = new AlgorithmIdentifier(
+ mData.Mac.AlgorithmID.ObjectID, 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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