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using System;
using Org.BouncyCastle.Utilities;
namespace Org.BouncyCastle.Asn1.Misc
{
public class Cast5CbcParameters
: Asn1Encodable
{
public static Cast5CbcParameters GetInstance(object o)
{
if (o == null)
return null;
if (o is Cast5CbcParameters cast5CbcParameters)
return cast5CbcParameters;
return new Cast5CbcParameters(Asn1Sequence.GetInstance(o));
}
public static Cast5CbcParameters GetInstance(Asn1TaggedObject taggedObject, bool declaredExplicit)
{
return new Cast5CbcParameters(Asn1Sequence.GetInstance(taggedObject, declaredExplicit));
}
private readonly Asn1OctetString m_iv;
private readonly DerInteger m_keyLength;
private Cast5CbcParameters(Asn1Sequence seq)
{
int count = seq.Count, pos = 0;
if (count < 1 || count > 2)
throw new ArgumentException("Bad sequence size: " + count, nameof(seq));
m_iv = Asn1Utilities.ReadOptional(seq, ref pos, Asn1OctetString.GetOptional)
?? new DerOctetString(new byte[8]);
m_keyLength = DerInteger.GetInstance(seq[pos++]);
if (pos != count)
throw new ArgumentException("Unexpected elements in sequence", nameof(seq));
}
public Cast5CbcParameters(byte[] iv, int keyLength)
{
m_iv = new DerOctetString(iv ?? new byte[8]);
m_keyLength = new DerInteger(keyLength);
}
public Asn1OctetString IV => m_iv;
public byte[] GetIV() => Arrays.Clone(m_iv.GetOctets());
public int KeyLength => m_keyLength.IntValueExact;
/**
* Produce an object suitable for an Asn1OutputStream.
* <pre>
* cast5CBCParameters ::= Sequence {
* iv OCTET STRING DEFAULT 0,
* -- Initialization vector
* keyLength Integer
* -- Key length, in bits
* }
* </pre>
*/
public override Asn1Object ToAsn1Object()
{
return IsDefaultIV(m_iv)
? new DerSequence(m_keyLength)
: new DerSequence(m_iv, m_keyLength);
}
private static bool IsDefaultIV(Asn1OctetString iv)
{
return iv.GetOctetsLength() == 8
&& Arrays.AreAllZeroes(iv.GetOctets(), 0, 8);
}
}
}
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