releasing mercury-1.0.0-alpha-1
git-svn-id: https://svn.apache.org/repos/asf/maven/sandbox/tags/mercury-1.0.0-alpha-1@701561 13f79535-47bb-0310-9956-ffa450edef68
diff --git a/mercury-crypto/mercury-crypto-basic/src/main/java/org/apache/maven/mercury/crypto/pgp/PgpHelper.java b/mercury-crypto/mercury-crypto-basic/src/main/java/org/apache/maven/mercury/crypto/pgp/PgpHelper.java
new file mode 100644
index 0000000..0146e69
--- /dev/null
+++ b/mercury-crypto/mercury-crypto-basic/src/main/java/org/apache/maven/mercury/crypto/pgp/PgpHelper.java
@@ -0,0 +1,152 @@
+package org.apache.maven.mercury.crypto.pgp;
+
+import java.io.ByteArrayOutputStream;
+import java.io.FileInputStream;
+import java.io.IOException;
+import java.io.InputStream;
+import java.math.BigInteger;
+import java.security.Security;
+import java.util.Iterator;
+
+import org.bouncycastle.jce.provider.BouncyCastleProvider;
+import org.bouncycastle.openpgp.PGPCompressedData;
+import org.bouncycastle.openpgp.PGPException;
+import org.bouncycastle.openpgp.PGPObjectFactory;
+import org.bouncycastle.openpgp.PGPSecretKey;
+import org.bouncycastle.openpgp.PGPSecretKeyRing;
+import org.bouncycastle.openpgp.PGPSecretKeyRingCollection;
+import org.bouncycastle.openpgp.PGPSignature;
+import org.bouncycastle.openpgp.PGPSignatureList;
+import org.bouncycastle.openpgp.PGPUtil;
+import org.codehaus.plexus.lang.DefaultLanguage;
+import org.codehaus.plexus.lang.Language;
+
+/**
+ * PGP helper - collection of utility methods, loosely based on one of the
+ * Bouncy Castle's SignedFileProcessor.java
+ *
+ */
+public class PgpHelper
+{
+ public static final String PROVIDER = "BC";
+ public static final String EXTENSION = "asc";
+
+ private static final Language lang = new DefaultLanguage( PgpHelper.class );
+ //---------------------------------------------------------------------------------
+ static
+ {
+ Security.addProvider( new BouncyCastleProvider() );
+ }
+ //---------------------------------------------------------------------------------
+ /**
+ * load a key ring stream and find the secret key by hex id
+ *
+ * @param in PGP keystore
+ * @param hexId key id
+ * @return
+ * @throws IOException
+ * @throws PGPException
+ */
+ public static PGPSecretKeyRing readKeyRing( InputStream in, String hexId )
+ throws IOException, PGPException
+ {
+ if( in == null )
+ throw new IllegalArgumentException( lang.getMessage( "null.input.stream" ) );
+
+ if( hexId == null || hexId.length() < 16 )
+ throw new IllegalArgumentException( lang.getMessage( "bad.key.id", hexId ) );
+
+ long id = hexToId( hexId );
+
+ in = PGPUtil.getDecoderStream( in );
+
+ PGPSecretKeyRingCollection pgpSec = new PGPSecretKeyRingCollection( in );
+
+ Iterator<PGPSecretKeyRing> ringIt = pgpSec.getKeyRings();
+
+ while( ringIt.hasNext() )
+ {
+ PGPSecretKeyRing keyRing = ringIt.next();
+ PGPSecretKey key = keyRing.getSecretKey( id );
+ if( key != null )
+ return keyRing;
+ }
+
+ throw new IllegalArgumentException( lang.getMessage( "no.secret.key", hexId ) );
+ }
+ //---------------------------------------------------------------------------------
+ public static long hexToId( String hexId )
+ {
+ BigInteger bi = new BigInteger( hexId, 16 );
+ return bi.longValue();
+ }
+ //---------------------------------------------------------------------------------
+ public static PGPSignature readSignature( InputStream inS )
+ throws IOException, PGPException
+ {
+ if( inS == null )
+ throw new IllegalArgumentException( "null.input.stream" );
+
+ InputStream in = inS;
+ in = PGPUtil.getDecoderStream( in );
+
+ PGPObjectFactory pgpObjectFactory = new PGPObjectFactory( in );
+ PGPSignatureList sigList = null;
+
+ Object pgpObject = pgpObjectFactory.nextObject();
+
+ if( pgpObject == null )
+ throw new PGPException( lang.getMessage( "no.objects.in.stream" ) );
+
+ if( pgpObject instanceof PGPCompressedData )
+ {
+ PGPCompressedData cd = (PGPCompressedData)pgpObject;
+
+ pgpObjectFactory = new PGPObjectFactory( cd.getDataStream() );
+
+ sigList = (PGPSignatureList)pgpObjectFactory.nextObject();
+ }
+ else
+ {
+ sigList = (PGPSignatureList)pgpObject;
+ }
+
+ if( sigList.size() < 1 )
+ throw new PGPException( lang.getMessage( "no.signatures.in.stream" ) );
+
+ PGPSignature sig = sigList.get(0);
+
+ return sig;
+ }
+ //---------------------------------------------------------------------------------
+ public static String streamToString( InputStream in )
+ throws IOException
+ {
+ if( in == null )
+ return null;
+
+ ByteArrayOutputStream ba = new ByteArrayOutputStream();
+ int b = 0;
+ while( (b = in.read()) != -1 )
+ ba.write( b );
+
+ return ba.toString();
+ }
+ //---------------------------------------------------------------------------------
+ public static String fileToString( String fileName )
+ throws IOException
+ {
+ FileInputStream fis = null;
+ try
+ {
+ fis = new FileInputStream( fileName );
+ return streamToString( fis );
+ }
+ finally
+ {
+ if( fis != null ) try { fis.close(); } catch( Exception any ) {}
+ }
+ }
+ //---------------------------------------------------------------------------------
+ //---------------------------------------------------------------------------------
+}
