1 files changed, 94 insertions, 0 deletions
diff --git a/Crypto/src/util/io/pem/PemReader.cs b/Crypto/src/util/io/pem/PemReader.cs
new file mode 100644
index 000000000..b3284705d
--- /dev/null
+++ b/Crypto/src/util/io/pem/PemReader.cs
@@ -0,0 +1,94 @@
+using System;
+using System.Collections;
+using System.IO;
+using System.Text;
+
+using Org.BouncyCastle.Utilities.Encoders;
+
+namespace Org.BouncyCastle.Utilities.IO.Pem
+{
+ public class PemReader
+ {
+ private const string BeginString = "-----BEGIN ";
+ private const string EndString = "-----END ";
+
+ private readonly TextReader reader;
+
+ public PemReader(TextReader reader)
+ {
+ if (reader == null)
+ throw new ArgumentNullException("reader");
+
+ this.reader = reader;
+ }
+
+ public TextReader Reader
+ {
+ get { return reader; }
+ }
+
+ /// <returns>
+ /// A <see cref="PemObject"/>
+ /// </returns>
+ /// <exception cref="IOException"></exception>
+ public PemObject ReadPemObject()
+ {
+ string line = reader.ReadLine();
+
+ if (line != null && line.StartsWith(BeginString))
+ {
+ line = line.Substring(BeginString.Length);
+ int index = line.IndexOf('-');
+ string type = line.Substring(0, index);
+
+ if (index > 0)
+ return LoadObject(type);
+ }
+
+ return null;
+ }
+
+ private PemObject LoadObject(string type)
+ {
+ string endMarker = EndString + type;
+ IList headers = Platform.CreateArrayList();
+ StringBuilder buf = new StringBuilder();
+
+ string line;
+ while ((line = reader.ReadLine()) != null
+ && line.IndexOf(endMarker) == -1)
+ {
+ int colonPos = line.IndexOf(':');
+
+ if (colonPos == -1)
+ {
+ buf.Append(line.Trim());
+ }
+ else
+ {
+ // Process field
+ string fieldName = line.Substring(0, colonPos).Trim();
+
+ if (fieldName.StartsWith("X-"))
+ fieldName = fieldName.Substring(2);
+
+ string fieldValue = line.Substring(colonPos + 1).Trim();
+
+ headers.Add(new PemHeader(fieldName, fieldValue));
+ }
+ }
+
+ if (line == null)
+ {
+ throw new IOException(endMarker + " not found");
+ }
+
+ if (buf.Length % 4 != 0)
+ {
+ throw new IOException("base64 data appears to be truncated");
+ }
+
+ return new PemObject(type, headers, Base64.Decode(buf.ToString()));
+ }
+ }
+}
|
