95 lines
1.6 KiB
C#
95 lines
1.6 KiB
C#
using System;
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using System.IO;
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using System.Text;
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using Org.BouncyCastle.Asn1;
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using Org.BouncyCastle.Utilities.Encoders;
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namespace Org.BouncyCastle.X509
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{
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class PemParser
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{
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private readonly string _header1;
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private readonly string _header2;
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private readonly string _footer1;
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private readonly string _footer2;
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internal PemParser(
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string type)
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{
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_header1 = "-----BEGIN " + type + "-----";
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_header2 = "-----BEGIN X509 " + type + "-----";
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_footer1 = "-----END " + type + "-----";
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_footer2 = "-----END X509 " + type + "-----";
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}
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private string ReadLine(
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Stream inStream)
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{
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int c;
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StringBuilder l = new StringBuilder();
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do
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{
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while (((c = inStream.ReadByte()) != '\r') && c != '\n' && (c >= 0))
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{
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if (c == '\r')
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{
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continue;
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}
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l.Append((char)c);
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}
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}
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while (c >= 0 && l.Length == 0);
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if (c < 0)
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{
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return null;
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}
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return l.ToString();
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}
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internal Asn1Sequence ReadPemObject(
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Stream inStream)
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{
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string line;
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StringBuilder pemBuf = new StringBuilder();
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while ((line = ReadLine(inStream)) != null)
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{
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if (line.StartsWith(_header1) || line.StartsWith(_header2))
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{
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break;
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}
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}
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while ((line = ReadLine(inStream)) != null)
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{
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if (line.StartsWith(_footer1) || line.StartsWith(_footer2))
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{
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break;
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}
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pemBuf.Append(line);
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}
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if (pemBuf.Length != 0)
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{
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Asn1Object o = Asn1Object.FromByteArray(Base64.Decode(pemBuf.ToString()));
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if (!(o is Asn1Sequence))
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{
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throw new IOException("malformed PEM data encountered");
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}
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return (Asn1Sequence) o;
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}
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return null;
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}
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}
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}
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