552 lines
19 KiB
C#
552 lines
19 KiB
C#
using System;
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using System.Collections;
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using System.IO;
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using Org.BouncyCastle.Asn1;
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using Org.BouncyCastle.Asn1.Cms;
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using Org.BouncyCastle.Asn1.Kisa;
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using Org.BouncyCastle.Asn1.Nist;
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using Org.BouncyCastle.Asn1.Ntt;
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using Org.BouncyCastle.Asn1.Pkcs;
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using Org.BouncyCastle.Asn1.X509;
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using Org.BouncyCastle.Asn1.X9;
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using Org.BouncyCastle.Crypto;
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using Org.BouncyCastle.Crypto.Parameters;
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using Org.BouncyCastle.Math;
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using Org.BouncyCastle.Security;
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using Org.BouncyCastle.X509;
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namespace Org.BouncyCastle.Cms
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{
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/**
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* General class for generating a CMS enveloped-data message.
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*
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* A simple example of usage.
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*
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* <pre>
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* CMSEnvelopedDataGenerator fact = new CMSEnvelopedDataGenerator();
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*
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* fact.addKeyTransRecipient(cert);
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*
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* CMSEnvelopedData data = fact.generate(content, algorithm, "BC");
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* </pre>
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*/
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public class CmsEnvelopedGenerator
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{
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internal static readonly short[] rc2Table =
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{
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0xbd, 0x56, 0xea, 0xf2, 0xa2, 0xf1, 0xac, 0x2a, 0xb0, 0x93, 0xd1, 0x9c, 0x1b, 0x33, 0xfd, 0xd0,
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0x30, 0x04, 0xb6, 0xdc, 0x7d, 0xdf, 0x32, 0x4b, 0xf7, 0xcb, 0x45, 0x9b, 0x31, 0xbb, 0x21, 0x5a,
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0x41, 0x9f, 0xe1, 0xd9, 0x4a, 0x4d, 0x9e, 0xda, 0xa0, 0x68, 0x2c, 0xc3, 0x27, 0x5f, 0x80, 0x36,
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0x3e, 0xee, 0xfb, 0x95, 0x1a, 0xfe, 0xce, 0xa8, 0x34, 0xa9, 0x13, 0xf0, 0xa6, 0x3f, 0xd8, 0x0c,
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0x78, 0x24, 0xaf, 0x23, 0x52, 0xc1, 0x67, 0x17, 0xf5, 0x66, 0x90, 0xe7, 0xe8, 0x07, 0xb8, 0x60,
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0x48, 0xe6, 0x1e, 0x53, 0xf3, 0x92, 0xa4, 0x72, 0x8c, 0x08, 0x15, 0x6e, 0x86, 0x00, 0x84, 0xfa,
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0xf4, 0x7f, 0x8a, 0x42, 0x19, 0xf6, 0xdb, 0xcd, 0x14, 0x8d, 0x50, 0x12, 0xba, 0x3c, 0x06, 0x4e,
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0xec, 0xb3, 0x35, 0x11, 0xa1, 0x88, 0x8e, 0x2b, 0x94, 0x99, 0xb7, 0x71, 0x74, 0xd3, 0xe4, 0xbf,
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0x3a, 0xde, 0x96, 0x0e, 0xbc, 0x0a, 0xed, 0x77, 0xfc, 0x37, 0x6b, 0x03, 0x79, 0x89, 0x62, 0xc6,
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0xd7, 0xc0, 0xd2, 0x7c, 0x6a, 0x8b, 0x22, 0xa3, 0x5b, 0x05, 0x5d, 0x02, 0x75, 0xd5, 0x61, 0xe3,
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0x18, 0x8f, 0x55, 0x51, 0xad, 0x1f, 0x0b, 0x5e, 0x85, 0xe5, 0xc2, 0x57, 0x63, 0xca, 0x3d, 0x6c,
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0xb4, 0xc5, 0xcc, 0x70, 0xb2, 0x91, 0x59, 0x0d, 0x47, 0x20, 0xc8, 0x4f, 0x58, 0xe0, 0x01, 0xe2,
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0x16, 0x38, 0xc4, 0x6f, 0x3b, 0x0f, 0x65, 0x46, 0xbe, 0x7e, 0x2d, 0x7b, 0x82, 0xf9, 0x40, 0xb5,
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0x1d, 0x73, 0xf8, 0xeb, 0x26, 0xc7, 0x87, 0x97, 0x25, 0x54, 0xb1, 0x28, 0xaa, 0x98, 0x9d, 0xa5,
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0x64, 0x6d, 0x7a, 0xd4, 0x10, 0x81, 0x44, 0xef, 0x49, 0xd6, 0xae, 0x2e, 0xdd, 0x76, 0x5c, 0x2f,
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0xa7, 0x1c, 0xc9, 0x09, 0x69, 0x9a, 0x83, 0xcf, 0x29, 0x39, 0xb9, 0xe9, 0x4c, 0xff, 0x43, 0xab
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};
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internal static readonly short[] rc2Ekb =
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{
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0x5d, 0xbe, 0x9b, 0x8b, 0x11, 0x99, 0x6e, 0x4d, 0x59, 0xf3, 0x85, 0xa6, 0x3f, 0xb7, 0x83, 0xc5,
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0xe4, 0x73, 0x6b, 0x3a, 0x68, 0x5a, 0xc0, 0x47, 0xa0, 0x64, 0x34, 0x0c, 0xf1, 0xd0, 0x52, 0xa5,
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0xb9, 0x1e, 0x96, 0x43, 0x41, 0xd8, 0xd4, 0x2c, 0xdb, 0xf8, 0x07, 0x77, 0x2a, 0xca, 0xeb, 0xef,
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0x10, 0x1c, 0x16, 0x0d, 0x38, 0x72, 0x2f, 0x89, 0xc1, 0xf9, 0x80, 0xc4, 0x6d, 0xae, 0x30, 0x3d,
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0xce, 0x20, 0x63, 0xfe, 0xe6, 0x1a, 0xc7, 0xb8, 0x50, 0xe8, 0x24, 0x17, 0xfc, 0x25, 0x6f, 0xbb,
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0x6a, 0xa3, 0x44, 0x53, 0xd9, 0xa2, 0x01, 0xab, 0xbc, 0xb6, 0x1f, 0x98, 0xee, 0x9a, 0xa7, 0x2d,
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0x4f, 0x9e, 0x8e, 0xac, 0xe0, 0xc6, 0x49, 0x46, 0x29, 0xf4, 0x94, 0x8a, 0xaf, 0xe1, 0x5b, 0xc3,
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0xb3, 0x7b, 0x57, 0xd1, 0x7c, 0x9c, 0xed, 0x87, 0x40, 0x8c, 0xe2, 0xcb, 0x93, 0x14, 0xc9, 0x61,
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0x2e, 0xe5, 0xcc, 0xf6, 0x5e, 0xa8, 0x5c, 0xd6, 0x75, 0x8d, 0x62, 0x95, 0x58, 0x69, 0x76, 0xa1,
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0x4a, 0xb5, 0x55, 0x09, 0x78, 0x33, 0x82, 0xd7, 0xdd, 0x79, 0xf5, 0x1b, 0x0b, 0xde, 0x26, 0x21,
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0x28, 0x74, 0x04, 0x97, 0x56, 0xdf, 0x3c, 0xf0, 0x37, 0x39, 0xdc, 0xff, 0x06, 0xa4, 0xea, 0x42,
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0x08, 0xda, 0xb4, 0x71, 0xb0, 0xcf, 0x12, 0x7a, 0x4e, 0xfa, 0x6c, 0x1d, 0x84, 0x00, 0xc8, 0x7f,
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0x91, 0x45, 0xaa, 0x2b, 0xc2, 0xb1, 0x8f, 0xd5, 0xba, 0xf2, 0xad, 0x19, 0xb2, 0x67, 0x36, 0xf7,
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0x0f, 0x0a, 0x92, 0x7d, 0xe3, 0x9d, 0xe9, 0x90, 0x3e, 0x23, 0x27, 0x66, 0x13, 0xec, 0x81, 0x15,
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0xbd, 0x22, 0xbf, 0x9f, 0x7e, 0xa9, 0x51, 0x4b, 0x4c, 0xfb, 0x02, 0xd3, 0x70, 0x86, 0x31, 0xe7,
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0x3b, 0x05, 0x03, 0x54, 0x60, 0x48, 0x65, 0x18, 0xd2, 0xcd, 0x5f, 0x32, 0x88, 0x0e, 0x35, 0xfd
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};
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// TODO Create named constants for all of these
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public static readonly string DesEde3Cbc = PkcsObjectIdentifiers.DesEde3Cbc.Id;
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public static readonly string RC2Cbc = PkcsObjectIdentifiers.RC2Cbc.Id;
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public const string IdeaCbc = "1.3.6.1.4.1.188.7.1.1.2";
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public const string Cast5Cbc = "1.2.840.113533.7.66.10";
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public static readonly string Aes128Cbc = NistObjectIdentifiers.IdAes128Cbc.Id;
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public static readonly string Aes192Cbc = NistObjectIdentifiers.IdAes192Cbc.Id;
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public static readonly string Aes256Cbc = NistObjectIdentifiers.IdAes256Cbc.Id;
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public static readonly string Camellia128Cbc = NttObjectIdentifiers.IdCamellia128Cbc.Id;
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public static readonly string Camellia192Cbc = NttObjectIdentifiers.IdCamellia192Cbc.Id;
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public static readonly string Camellia256Cbc = NttObjectIdentifiers.IdCamellia256Cbc.Id;
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public static readonly string SeedCbc = KisaObjectIdentifiers.IdSeedCbc.Id;
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public static readonly string DesEde3Wrap = PkcsObjectIdentifiers.IdAlgCms3DesWrap.Id;
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public static readonly string Aes128Wrap = NistObjectIdentifiers.IdAes128Wrap.Id;
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public static readonly string Aes192Wrap = NistObjectIdentifiers.IdAes192Wrap.Id;
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public static readonly string Aes256Wrap = NistObjectIdentifiers.IdAes256Wrap.Id;
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public static readonly string Camellia128Wrap = NttObjectIdentifiers.IdCamellia128Wrap.Id;
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public static readonly string Camellia192Wrap = NttObjectIdentifiers.IdCamellia192Wrap.Id;
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public static readonly string Camellia256Wrap = NttObjectIdentifiers.IdCamellia256Wrap.Id;
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public static readonly string SeedWrap = KisaObjectIdentifiers.IdNpkiAppCmsSeedWrap.Id;
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public static readonly string ECDHSha1Kdf = X9ObjectIdentifiers.DHSinglePassStdDHSha1KdfScheme.Id;
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internal static readonly CmsEnvelopedHelper Helper = CmsEnvelopedHelper.Instance;
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internal readonly IList recipientInfs = new ArrayList();
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internal readonly SecureRandom rand;
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protected class RecipientInf
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{
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private readonly X509Certificate cert;
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private AlgorithmIdentifier keyEncAlg;
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private readonly AsymmetricKeyParameter pubKey;
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private readonly Asn1OctetString subKeyId;
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private readonly string secKeyAlgorithm;
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private readonly KeyParameter secKey;
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private readonly KekIdentifier secKeyId;
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private readonly OriginatorIdentifierOrKey originator;
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private const Asn1OctetString ukm = null;
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private readonly AlgorithmIdentifier derivationAlg;
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internal RecipientInf(
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X509Certificate cert)
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{
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this.cert = cert;
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this.pubKey = cert.GetPublicKey();
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try
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{
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TbsCertificateStructure tbs = TbsCertificateStructure.GetInstance(
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Asn1Object.FromByteArray(cert.GetTbsCertificate()));
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keyEncAlg = tbs.SubjectPublicKeyInfo.AlgorithmID;
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}
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// catch (IOException e)
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catch (Exception)
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{
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throw new ArgumentException("can't extract key algorithm from this cert");
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}
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// catch (CertificateEncodingException)
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// {
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// throw new ArgumentException("can't extract tbs structure from this cert");
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// }
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}
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internal RecipientInf(
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AsymmetricKeyParameter pubKey,
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Asn1OctetString subKeyId)
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{
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this.pubKey = pubKey;
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this.subKeyId = subKeyId;
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try
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{
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SubjectPublicKeyInfo info = SubjectPublicKeyInfoFactory.CreateSubjectPublicKeyInfo(pubKey);
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keyEncAlg = info.AlgorithmID;
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}
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catch (IOException)
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{
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throw new ArgumentException("can't extract key algorithm from this key");
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}
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}
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internal RecipientInf(
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string secKeyAlgorithm, // TODO Can get this from secKey?
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KeyParameter secKey,
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KekIdentifier secKeyId)
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{
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this.secKeyAlgorithm = secKeyAlgorithm;
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this.secKey = secKey;
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this.secKeyId = secKeyId;
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if (secKeyAlgorithm.StartsWith("DES"))
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{
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keyEncAlg = new AlgorithmIdentifier(
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PkcsObjectIdentifiers.IdAlgCms3DesWrap,
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DerNull.Instance);
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}
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else if (secKeyAlgorithm.StartsWith("RC2"))
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{
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keyEncAlg = new AlgorithmIdentifier(
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PkcsObjectIdentifiers.IdAlgCmsRC2Wrap,
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new DerInteger(58));
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}
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else if (secKeyAlgorithm.StartsWith("AES"))
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{
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int length = secKey.GetKey().Length * 8;
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DerObjectIdentifier wrapOid;
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if (length == 128)
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{
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wrapOid = NistObjectIdentifiers.IdAes128Wrap;
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}
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else if (length == 192)
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{
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wrapOid = NistObjectIdentifiers.IdAes192Wrap;
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}
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else if (length == 256)
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{
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wrapOid = NistObjectIdentifiers.IdAes256Wrap;
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}
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else
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{
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throw new ArgumentException("illegal keysize in AES");
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}
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keyEncAlg = new AlgorithmIdentifier(wrapOid); // parameters absent
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}
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else if (secKeyAlgorithm.StartsWith("SEED"))
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{
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// parameters absent
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keyEncAlg = new AlgorithmIdentifier(KisaObjectIdentifiers.IdNpkiAppCmsSeedWrap);
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}
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else if (secKeyAlgorithm.StartsWith("CAMELLIA"))
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{
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int length = secKey.GetKey().Length * 8;
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DerObjectIdentifier wrapOid;
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if (length == 128)
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{
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wrapOid = NttObjectIdentifiers.IdCamellia128Wrap;
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}
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else if (length == 192)
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{
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wrapOid = NttObjectIdentifiers.IdCamellia192Wrap;
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}
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else if (length == 256)
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{
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wrapOid = NttObjectIdentifiers.IdCamellia256Wrap;
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}
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else
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{
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throw new ArgumentException("illegal keysize in Camellia");
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}
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keyEncAlg = new AlgorithmIdentifier(wrapOid); // parameters must be absent
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}
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else
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{
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throw new ArgumentException("unknown algorithm");
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}
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}
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public RecipientInf(
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string secKeyAlgorithm, // TODO Can get this from secKey?
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KeyParameter secKey,
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string algorithm,
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string wrapOid,
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OriginatorIdentifierOrKey originator,
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X509Certificate cert)
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{
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DerSequence paramSeq = new DerSequence(
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new DerObjectIdentifier(wrapOid),
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DerNull.Instance);
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this.secKeyAlgorithm = secKeyAlgorithm;
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this.secKey = secKey;
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this.keyEncAlg = new AlgorithmIdentifier(new DerObjectIdentifier(algorithm), paramSeq);
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this.originator = originator;
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this.cert = cert;
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}
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public RecipientInf(
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string secKeyAlgorithm, // TODO Can get this from secKey?
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KeyParameter secKey,
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AlgorithmIdentifier derivationAlg)
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{
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this.secKeyAlgorithm = secKeyAlgorithm;
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this.secKey = secKey;
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this.derivationAlg = derivationAlg;
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}
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internal RecipientInfo ToRecipientInfo(
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KeyParameter key,
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SecureRandom random)
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{
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byte[] keyBytes = key.GetKey();
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if (pubKey != null)
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{
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IWrapper keyWrapper = Helper.CreateWrapper(keyEncAlg.ObjectID.Id);
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keyWrapper.Init(true, new ParametersWithRandom(pubKey, random));
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Asn1OctetString encKey = new DerOctetString(
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keyWrapper.Wrap(keyBytes, 0, keyBytes.Length));
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RecipientIdentifier recipId;
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if (cert != null)
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{
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TbsCertificateStructure tbs = TbsCertificateStructure.GetInstance(
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Asn1Object.FromByteArray(cert.GetTbsCertificate()));
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Asn1.Cms.IssuerAndSerialNumber encSid = new Asn1.Cms.IssuerAndSerialNumber(
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tbs.Issuer, tbs.SerialNumber.Value);
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recipId = new RecipientIdentifier(encSid);
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}
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else
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{
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recipId = new RecipientIdentifier(subKeyId);
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}
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return new RecipientInfo(new KeyTransRecipientInfo(recipId, keyEncAlg, encKey));
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}
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else if (originator != null)
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{
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IWrapper keyWrapper = Helper.CreateWrapper(
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DerObjectIdentifier.GetInstance(
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Asn1Sequence.GetInstance(keyEncAlg.Parameters)[0]).Id);
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keyWrapper.Init(true, new ParametersWithRandom(secKey, random));
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Asn1OctetString encKey = new DerOctetString(
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keyWrapper.Wrap(keyBytes, 0, keyBytes.Length));
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RecipientEncryptedKey rKey = new RecipientEncryptedKey(
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new KeyAgreeRecipientIdentifier(
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new Asn1.Cms.IssuerAndSerialNumber(
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PrincipalUtilities.GetIssuerX509Principal(cert),
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cert.SerialNumber)),
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encKey);
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return new RecipientInfo(
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new KeyAgreeRecipientInfo(originator, ukm, keyEncAlg, new DerSequence(rKey)));
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}
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else if (derivationAlg != null)
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{
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string rfc3211WrapperName = Helper.GetRfc3211WrapperName(secKeyAlgorithm);
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IWrapper keyWrapper = Helper.CreateWrapper(rfc3211WrapperName);
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// Note: In Java build, the IV is automatically generated in JCE layer
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int ivLength = rfc3211WrapperName.StartsWith("DESEDE") ? 8 : 16;
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byte[] iv = new byte[ivLength];
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random.NextBytes(iv);
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ICipherParameters parameters = new ParametersWithIV(secKey, iv);
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keyWrapper.Init(true, new ParametersWithRandom(parameters, random));
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Asn1OctetString encKey = new DerOctetString(
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keyWrapper.Wrap(keyBytes, 0, keyBytes.Length));
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// byte[] iv = keyWrapper.GetIV();
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DerSequence seq = new DerSequence(
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new DerObjectIdentifier(secKeyAlgorithm),
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new DerOctetString(iv));
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keyEncAlg = new AlgorithmIdentifier(PkcsObjectIdentifiers.IdAlgPwriKek, seq);
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return new RecipientInfo(new PasswordRecipientInfo(derivationAlg, keyEncAlg, encKey));
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}
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else
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{
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IWrapper keyWrapper = Helper.CreateWrapper(keyEncAlg.ObjectID.Id);
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keyWrapper.Init(true, new ParametersWithRandom(secKey, random));
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Asn1OctetString encKey = new DerOctetString(
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keyWrapper.Wrap(keyBytes, 0, keyBytes.Length));
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return new RecipientInfo(new KekRecipientInfo(secKeyId, keyEncAlg, encKey));
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}
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}
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}
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public CmsEnvelopedGenerator()
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: this(new SecureRandom())
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{
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}
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/// <summary>Constructor allowing specific source of randomness</summary>
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/// <param name="rand">Instance of <c>SecureRandom</c> to use.</param>
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public CmsEnvelopedGenerator(
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SecureRandom rand)
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{
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this.rand = rand;
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}
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/**
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* add a recipient.
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*
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* @param cert recipient's public key certificate
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* @exception ArgumentException if there is a problem with the certificate
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*/
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public void AddKeyTransRecipient(
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X509Certificate cert)
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{
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recipientInfs.Add(new RecipientInf(cert));
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}
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/**
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* add a recipient
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*
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* @param key the public key used by the recipient
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* @param subKeyId the identifier for the recipient's public key
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* @exception ArgumentException if there is a problem with the key
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*/
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public void AddKeyTransRecipient(
|
|
AsymmetricKeyParameter pubKey,
|
|
byte[] subKeyId)
|
|
{
|
|
recipientInfs.Add(new CmsEnvelopedGenerator.RecipientInf(pubKey, new DerOctetString(subKeyId)));
|
|
}
|
|
|
|
/**
|
|
* add a KEK recipient.
|
|
* @param key the secret key to use for wrapping
|
|
* @param keyIdentifier the byte string that identifies the key
|
|
*/
|
|
public void AddKekRecipient(
|
|
string keyAlgorithm, // TODO Remove need for this parameter
|
|
KeyParameter key,
|
|
byte[] keyIdentifier)
|
|
{
|
|
recipientInfs.Add(new RecipientInf(keyAlgorithm, key, new KekIdentifier(keyIdentifier, null, null)));
|
|
}
|
|
|
|
public void AddPasswordRecipient(
|
|
CmsPbeKey pbeKey,
|
|
string kekAlgorithmOid)
|
|
{
|
|
Pbkdf2Params p = new Pbkdf2Params(pbeKey.Salt, pbeKey.IterationCount);
|
|
KeyParameter secretKey = pbeKey.GetEncoded(kekAlgorithmOid);
|
|
recipientInfs.Add(new RecipientInf(kekAlgorithmOid, secretKey, new AlgorithmIdentifier(PkcsObjectIdentifiers.IdPbkdf2, p)));
|
|
}
|
|
|
|
/**
|
|
* Add a key agreement based recipient.
|
|
*
|
|
* @param agreementAlgorithm key agreement algorithm to use.
|
|
* @param senderPrivateKey private key to initialise sender side of agreement with.
|
|
* @param senderPublicKey sender public key to include with message.
|
|
* @param recipientCert recipient's public key certificate.
|
|
* @param cekWrapAlgorithm OID for key wrapping algorithm to use.
|
|
* @exception SecurityUtilityException if the algorithm requested cannot be found
|
|
* @exception InvalidKeyException if the keys are inappropriate for the algorithm specified
|
|
*/
|
|
public void AddKeyAgreementRecipient(
|
|
string agreementAlgorithm,
|
|
AsymmetricKeyParameter senderPrivateKey,
|
|
AsymmetricKeyParameter senderPublicKey,
|
|
X509Certificate recipientCert,
|
|
string cekWrapAlgorithm)
|
|
{
|
|
if (!senderPrivateKey.IsPrivate)
|
|
throw new ArgumentException("Expected private key", "senderPrivateKey");
|
|
if (senderPublicKey.IsPrivate)
|
|
throw new ArgumentException("Expected public key", "senderPublicKey");
|
|
|
|
IBasicAgreement agreement = AgreementUtilities.GetBasicAgreementWithKdf(
|
|
agreementAlgorithm, cekWrapAlgorithm);
|
|
|
|
agreement.Init(new ParametersWithRandom(senderPrivateKey, rand));
|
|
|
|
BigInteger secretNum = agreement.CalculateAgreement(recipientCert.GetPublicKey());
|
|
|
|
try
|
|
{
|
|
SubjectPublicKeyInfo oPubKeyInfo =
|
|
SubjectPublicKeyInfoFactory.CreateSubjectPublicKeyInfo(senderPublicKey);
|
|
|
|
OriginatorIdentifierOrKey originator = new OriginatorIdentifierOrKey(
|
|
new OriginatorPublicKey(
|
|
new AlgorithmIdentifier(oPubKeyInfo.AlgorithmID.ObjectID, DerNull.Instance),
|
|
oPubKeyInfo.PublicKeyData.GetBytes()));
|
|
|
|
// TODO Fix the way bytes are derived from the secret
|
|
byte[] secretBytes = secretNum.ToByteArrayUnsigned();
|
|
KeyParameter secret = ParameterUtilities.CreateKeyParameter(
|
|
cekWrapAlgorithm, secretBytes);
|
|
|
|
recipientInfs.Add(
|
|
new RecipientInf(cekWrapAlgorithm, secret, agreementAlgorithm,
|
|
cekWrapAlgorithm, originator, recipientCert));
|
|
}
|
|
catch (IOException e)
|
|
{
|
|
throw new InvalidKeyException("cannot extract originator public key: " + e);
|
|
}
|
|
}
|
|
|
|
protected internal virtual AlgorithmIdentifier GetAlgorithmIdentifier(
|
|
string encryptionOid,
|
|
KeyParameter encKey,
|
|
Asn1Encodable asn1Params,
|
|
out ICipherParameters cipherParameters)
|
|
{
|
|
Asn1Object asn1Object;
|
|
if (asn1Params != null)
|
|
{
|
|
asn1Object = asn1Params.ToAsn1Object();
|
|
cipherParameters = ParameterUtilities.GetCipherParameters(
|
|
encryptionOid, encKey, asn1Object);
|
|
}
|
|
else
|
|
{
|
|
asn1Object = DerNull.Instance;
|
|
cipherParameters = encKey;
|
|
}
|
|
|
|
return new AlgorithmIdentifier(
|
|
new DerObjectIdentifier(encryptionOid),
|
|
asn1Object);
|
|
}
|
|
|
|
protected internal virtual Asn1Encodable GenerateAsn1Parameters(
|
|
string encryptionOid,
|
|
byte[] encKeyBytes)
|
|
{
|
|
Asn1Encodable asn1Params = null;
|
|
|
|
try
|
|
{
|
|
if (encryptionOid.Equals(RC2Cbc))
|
|
{
|
|
byte[] iv = new byte[8];
|
|
rand.NextBytes(iv);
|
|
|
|
// TODO Is this detailed repeat of Java version really necessary?
|
|
int effKeyBits = encKeyBytes.Length * 8;
|
|
int parameterVersion;
|
|
|
|
if (effKeyBits < 256)
|
|
{
|
|
parameterVersion = rc2Table[effKeyBits];
|
|
}
|
|
else
|
|
{
|
|
parameterVersion = effKeyBits;
|
|
}
|
|
|
|
asn1Params = new RC2CbcParameter(parameterVersion, iv);
|
|
}
|
|
else
|
|
{
|
|
asn1Params = ParameterUtilities.GenerateParameters(encryptionOid, rand);
|
|
}
|
|
}
|
|
catch (SecurityUtilityException)
|
|
{
|
|
// No problem... no parameters generated
|
|
}
|
|
|
|
return asn1Params;
|
|
}
|
|
}
|
|
}
|