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using System;
using System.IO;
using System.Text;
using Org.BouncyCastle.Utilities;
using Org.BouncyCastle.Utilities.Encoders;
namespace Org.BouncyCastle.Asn1.X500.Style
{
public abstract class IetfUtilities
{
public static string ValueToString(Asn1Encodable value)
{
StringBuilder vBuf = new StringBuilder();
if (value is IAsn1String && !(value is DerUniversalString))
{
string v = ((IAsn1String)value).GetString();
if (v.Length > 0 && v[0] == '#')
{
vBuf.Append('\\');
}
vBuf.Append(v);
}
else
{
try
{
vBuf.Append('#');
vBuf.Append(Hex.ToHexString(value.ToAsn1Object().GetEncoded(Asn1Encodable.Der)));
}
catch (IOException e)
{
throw new ArgumentException("Other value has no encoded form", e);
}
}
int end = vBuf.Length;
int index = 0;
if (vBuf.Length >= 2 && vBuf[0] == '\\' && vBuf[1] == '#')
{
index += 2;
}
while (index != end)
{
switch (vBuf[index])
{
case ',':
case '"':
case '\\':
case '+':
case '=':
case '<':
case '>':
case ';':
{
vBuf.Insert(index, "\\");
index += 2;
++end;
break;
}
default:
{
++index;
break;
}
}
}
int start = 0;
if (vBuf.Length > 0)
{
while (vBuf.Length > start && vBuf[start] == ' ')
{
vBuf.Insert(start, "\\");
start += 2;
}
}
int endBuf = vBuf.Length - 1;
while (endBuf >= 0 && vBuf[endBuf] == ' ')
{
vBuf.Insert(endBuf, "\\");
endBuf--;
}
return vBuf.ToString();
}
public static string Canonicalize(string s)
{
string value = s.ToLowerInvariant();
if (value.Length > 0 && value[0] == '#')
{
Asn1Object obj = DecodeObject(value);
if (obj is IAsn1String str)
{
value = str.GetString().ToLowerInvariant();
}
}
if (value.Length > 1)
{
int start = 0;
while (start + 1 < value.Length && value[start] == '\\' && value[start + 1] == ' ')
{
start += 2;
}
int end = value.Length - 1;
while (end - 1 > 0 && value[end - 1] == '\\' && value[end] == ' ')
{
end -= 2;
}
if (start > 0 || end < value.Length - 1)
{
value = value.Substring(start, end + 1 - start);
}
}
return StripInternalSpaces(value);
}
public static string CanonicalString(Asn1Encodable value)
{
return Canonicalize(ValueToString(value));
}
private static Asn1Object DecodeObject(string oValue)
{
try
{
return Asn1Object.FromByteArray(Hex.DecodeStrict(oValue, 1, oValue.Length - 1));
}
catch (IOException e)
{
throw new InvalidOperationException("unknown encoding in name: " + e);
}
}
public static string StripInternalSpaces(string str)
{
if (str.IndexOf(" ") < 0)
return str;
StringBuilder res = new StringBuilder();
char c1 = str[0];
res.Append(c1);
for (int k = 1; k < str.Length; k++)
{
char c2 = str[k];
if (!(' ' == c1 && ' ' == c2))
{
res.Append(c2);
c1 = c2;
}
}
return res.ToString();
}
public static bool RdnAreEqual(Rdn rdn1, Rdn rdn2)
{
if (rdn1.Count != rdn2.Count)
return false;
AttributeTypeAndValue[] atvs1 = rdn1.GetTypesAndValues();
AttributeTypeAndValue[] atvs2 = rdn2.GetTypesAndValues();
if (atvs1.Length != atvs2.Length)
return false;
for (int i = 0; i != atvs1.Length; i++)
{
if (!AtvAreEqual(atvs1[i], atvs2[i]))
return false;
}
return true;
}
private static bool AtvAreEqual(AttributeTypeAndValue atv1, AttributeTypeAndValue atv2)
{
if (atv1 == atv2)
return true;
if (null == atv1 || null == atv2)
return false;
DerObjectIdentifier o1 = atv1.Type;
DerObjectIdentifier o2 = atv2.Type;
if (!o1.Equals(o2))
return false;
string v1 = CanonicalString(atv1.Value);
string v2 = CanonicalString(atv2.Value);
if (!v1.Equals(v2))
return false;
return true;
}
}
}
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