1 files changed, 87 insertions, 0 deletions
diff --git a/core/src/main/java/org/spongycastle/util/io/pem/PemReader.java b/core/src/main/java/org/spongycastle/util/io/pem/PemReader.java
new file mode 100644
index 00000000..0b909167
--- /dev/null
+++ b/core/src/main/java/org/spongycastle/util/io/pem/PemReader.java
@@ -0,0 +1,87 @@
+package org.spongycastle.util.io.pem;
+
+import java.io.BufferedReader;
+import java.io.IOException;
+import java.io.Reader;
+import java.util.ArrayList;
+import java.util.List;
+
+import org.spongycastle.util.encoders.Base64;
+
+/**
+ * A generic PEM reader, based on the format outlined in RFC 1421
+ */
+public class PemReader
+    extends BufferedReader
+{
+    private static final String BEGIN = "-----BEGIN ";
+    private static final String END = "-----END ";
+
+    public PemReader(Reader reader)
+    {
+        super(reader);
+    }
+
+    public PemObject readPemObject()
+        throws IOException
+    {
+        String line = readLine();
+
+        while (line != null && !line.startsWith(BEGIN))
+        {
+            line = readLine();
+        }
+
+        if (line != null)
+        {
+            line = line.substring(BEGIN.length());
+            int index = line.indexOf('-');
+            String type = line.substring(0, index);
+
+            if (index > 0)
+            {
+                return loadObject(type);
+            }
+        }
+
+        return null;
+    }
+
+    private PemObject loadObject(String type)
+        throws IOException
+    {
+        String          line;
+        String          endMarker = END + type;
+        StringBuffer    buf = new StringBuffer();
+        List            headers = new ArrayList();
+
+        while ((line = readLine()) != null)
+        {
+            if (line.indexOf(":") >= 0)
+            {
+                int index = line.indexOf(':');
+                String hdr = line.substring(0, index);
+                String value = line.substring(index + 1).trim();
+
+                headers.add(new PemHeader(hdr, value));
+
+                continue;
+            }
+
+            if (line.indexOf(endMarker) != -1)
+            {
+                break;
+            }
+            
+            buf.append(line.trim());
+        }
+
+        if (line == null)
+        {
+            throw new IOException(endMarker + " not found");
+        }
+
+        return new PemObject(type, headers, Base64.decode(buf.toString()));
+    }
+
+}