1 files changed, 94 insertions, 0 deletions
diff --git a/crypto/src/x509/PEMParser.cs b/crypto/src/x509/PEMParser.cs
new file mode 100644
index 000000000..8c117f323
--- /dev/null
+++ b/crypto/src/x509/PEMParser.cs
@@ -0,0 +1,94 @@
+using System;
+using System.IO;
+using System.Text;
+
+using Org.BouncyCastle.Asn1;
+using Org.BouncyCastle.Utilities.Encoders;
+
+namespace Org.BouncyCastle.X509
+{
+ class PemParser
+ {
+ private readonly string _header1;
+ private readonly string _header2;
+ private readonly string _footer1;
+ private readonly string _footer2;
+
+ internal PemParser(
+ string type)
+ {
+ _header1 = "-----BEGIN " + type + "-----";
+ _header2 = "-----BEGIN X509 " + type + "-----";
+ _footer1 = "-----END " + type + "-----";
+ _footer2 = "-----END X509 " + type + "-----";
+ }
+
+ private string ReadLine(
+ Stream inStream)
+ {
+ int c;
+ StringBuilder l = new StringBuilder();
+
+ do
+ {
+ while (((c = inStream.ReadByte()) != '\r') && c != '\n' && (c >= 0))
+ {
+ if (c == '\r')
+ {
+ continue;
+ }
+
+ l.Append((char)c);
+ }
+ }
+ while (c >= 0 && l.Length == 0);
+
+ if (c < 0)
+ {
+ return null;
+ }
+
+ return l.ToString();
+ }
+
+ internal Asn1Sequence ReadPemObject(
+ Stream inStream)
+ {
+ string line;
+ StringBuilder pemBuf = new StringBuilder();
+
+ while ((line = ReadLine(inStream)) != null)
+ {
+ if (line.StartsWith(_header1) || line.StartsWith(_header2))
+ {
+ break;
+ }
+ }
+
+ while ((line = ReadLine(inStream)) != null)
+ {
+ if (line.StartsWith(_footer1) || line.StartsWith(_footer2))
+ {
+ break;
+ }
+
+ pemBuf.Append(line);
+ }
+
+ if (pemBuf.Length != 0)
+ {
+ Asn1Object o = Asn1Object.FromByteArray(Base64.Decode(pemBuf.ToString()));
+
+ if (!(o is Asn1Sequence))
+ {
+ throw new IOException("malformed PEM data encountered");
+ }
+
+ return (Asn1Sequence) o;
+ }
+
+ return null;
+ }
+ }
+}
+
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