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using System;
using System.IO;
using Org.BouncyCastle.Utilities.IO;
namespace Org.BouncyCastle.Bcpg.OpenPgp
{
/**
* Utility functions for looking a S-expression keys. This class will move when it finds a better home!
* <p>
* Format documented here:
* http://git.gnupg.org/cgi-bin/gitweb.cgi?p=gnupg.git;a=blob;f=agent/keyformat.txt;h=42c4b1f06faf1bbe71ffadc2fee0fad6bec91a97;hb=refs/heads/master
* </p>
*/
public sealed class SXprUtilities
{
private SXprUtilities()
{
}
private static int ReadLength(Stream input, int ch)
{
int len = ch - '0';
while ((ch = input.ReadByte()) >= 0 && ch != ':')
{
len = len * 10 + ch - '0';
}
return len;
}
internal static string ReadString(Stream input, int ch)
{
int len = ReadLength(input, ch);
#if NETCOREAPP2_1_OR_GREATER || NETSTANDARD2_1_OR_GREATER
return string.Create(len, input, (chars, input) =>
{
for (int i = 0; i < chars.Length; ++i)
{
chars[i] = Convert.ToChar(input.ReadByte());
}
});
#else
char[] chars = new char[len];
for (int i = 0; i != chars.Length; i++)
{
chars[i] = (char)input.ReadByte();
}
return new string(chars);
#endif
}
internal static byte[] ReadBytes(Stream input, int ch)
{
int len = ReadLength(input, ch);
byte[] data = new byte[len];
Streams.ReadFully(input, data);
return data;
}
internal static S2k ParseS2k(Stream input)
{
SkipOpenParenthesis(input);
string alg = ReadString(input, input.ReadByte());
byte[] iv = ReadBytes(input, input.ReadByte());
long iterationCount = long.Parse(ReadString(input, input.ReadByte()));
SkipCloseParenthesis(input);
// we have to return the actual iteration count provided.
return new MyS2k(HashAlgorithmTag.Sha1, iv, iterationCount);
}
internal static void SkipOpenParenthesis(Stream input)
{
int ch = input.ReadByte();
if (ch != '(')
throw new IOException("unknown character encountered");
}
internal static void SkipCloseParenthesis(Stream input)
{
int ch = input.ReadByte();
if (ch != ')')
throw new IOException("unknown character encountered");
}
private class MyS2k : S2k
{
private readonly long mIterationCount64;
internal MyS2k(HashAlgorithmTag algorithm, byte[] iv, long iterationCount64)
: base(algorithm, iv, (int)iterationCount64)
{
this.mIterationCount64 = iterationCount64;
}
public override long IterationCount
{
get { return mIterationCount64; }
}
}
}
}
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