1 files changed, 94 insertions, 0 deletions
diff --git a/prov/src/main/java/org/spongycastle/jce/provider/PEMUtil.java b/prov/src/main/java/org/spongycastle/jce/provider/PEMUtil.java
new file mode 100644
index 00000000..989d2ecc
--- /dev/null
+++ b/prov/src/main/java/org/spongycastle/jce/provider/PEMUtil.java
@@ -0,0 +1,94 @@
+package org.spongycastle.jce.provider;
+
+import java.io.IOException;
+import java.io.InputStream;
+
+import org.spongycastle.asn1.ASN1InputStream;
+import org.spongycastle.asn1.ASN1Primitive;
+import org.spongycastle.asn1.ASN1Sequence;
+import org.spongycastle.util.encoders.Base64;
+
+public class PEMUtil
+{
+    private final String _header1;
+    private final String _header2;
+    private final String _footer1;
+    private final String _footer2;
+
+    PEMUtil(
+        String type)
+    {
+        _header1 = "-----BEGIN " + type + "-----";
+        _header2 = "-----BEGIN X509 " + type + "-----";
+        _footer1 = "-----END " + type + "-----";
+        _footer2 = "-----END X509 " + type + "-----";
+    }
+
+    private String readLine(
+        InputStream in)
+        throws IOException
+    {
+        int             c;
+        StringBuffer    l = new StringBuffer();
+
+        do
+        {
+            while (((c = in.read()) != '\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();
+    }
+
+    ASN1Sequence readPEMObject(
+        InputStream  in)
+        throws IOException
+    {
+        String          line;
+        StringBuffer    pemBuf = new StringBuffer();
+
+        while ((line = readLine(in)) != null)
+        {
+            if (line.startsWith(_header1) || line.startsWith(_header2))
+            {
+                break;
+            }
+        }
+
+        while ((line = readLine(in)) != null)
+        {
+            if (line.startsWith(_footer1) || line.startsWith(_footer2))
+            {
+                break;
+            }
+
+            pemBuf.append(line);
+        }
+
+        if (pemBuf.length() != 0)
+        {
+            ASN1Primitive o = new ASN1InputStream(Base64.decode(pemBuf.toString())).readObject();
+            if (!(o instanceof ASN1Sequence))
+            {
+                throw new IOException("malformed PEM data encountered");
+            }
+
+            return (ASN1Sequence)o;
+        }
+
+        return null;
+    }
+}