compress stuff implemented

1 files changed, 100 insertions, 0 deletions

diff --git a/g10/cipher.c b/g10/cipher.c
new file mode 100644
index 000000000..562579a43
--- /dev/null
+++ b/g10/cipher.c
@@ -0,0 +1,100 @@
+/* cipher.c - En-/De-ciphering filter
+ *	Copyright (c) 1997 by Werner Koch (dd9jn)
+ *
+ * This file is part of G10.
+ *
+ * G10 is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * G10 is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
+ */
+
+#include <config.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <errno.h>
+#include <assert.h>
+
+#include "errors.h"
+#include "iobuf.h"
+#include "memory.h"
+#include "util.h"
+#include "filter.h"
+#include "packet.h"
+#include "options.h"
+
+
+
+
+/****************
+ * This filter is used to en/de-cipher data.
+ */
+int
+cipher_filter( void *opaque, int control,
+	       IOBUF a, byte *buf, size_t *ret_len)
+{
+    size_t size = *ret_len;
+    cipher_filter_context_t *cfx = opaque;
+    int rc=0;
+
+    if( control == IOBUFCTRL_UNDERFLOW ) { /* decipher */
+	rc = -1; /* FIXME:*/
+    }
+    else if( control == IOBUFCTRL_FLUSH ) { /* encipher */
+	assert(a);
+	if( !cfx->header ) {
+	    PACKET pkt;
+	    PKT_encr_data ed;
+	    byte temp[10];
+
+	    memset( &ed, 0, sizeof ed );
+	    ed.len = cfx->datalen;
+	    init_packet( &pkt );
+	    pkt.pkttype = PKT_ENCR_DATA;
+	    pkt.pkt.encr_data = &ed;
+	    if( build_packet( a, &pkt ))
+		log_bug("build_packet(ENCR_DATA) failed\n");
+	    randomize_buffer( temp, 8, 1 );
+	    temp[8] = temp[6];
+	    temp[9] = temp[7];
+	    if( cfx->dek->algo == CIPHER_ALGO_BLOWFISH ) {
+		cfx->bf_ctx = m_alloc_secure( sizeof *cfx->bf_ctx );
+		blowfish_setkey( cfx->bf_ctx, cfx->dek->key, cfx->dek->keylen );
+		blowfish_setiv( cfx->bf_ctx, NULL );
+		blowfish_encode_cfb( cfx->bf_ctx, temp, temp, 10);
+	    }
+	    else
+		log_bug("no cipher algo %d\n", cfx->dek->algo);
+
+	    iobuf_write(a, temp, 10);
+	    cfx->header=1;
+	}
+
+	if( cfx->dek->algo == CIPHER_ALGO_BLOWFISH )
+	    blowfish_encode_cfb( cfx->bf_ctx, buf, buf, size);
+	if( iobuf_write( a, buf, size ) )
+	    rc = G10ERR_WRITE_FILE;
+    }
+    else if( control == IOBUFCTRL_FREE ) {
+	if( cfx->dek->algo == CIPHER_ALGO_BLOWFISH )
+	    m_free(cfx->bf_ctx);
+    }
+    else if( control == IOBUFCTRL_DESC ) {
+	*(char**)buf = "cipher_filter";
+    }
+    return rc;
+}
+
+
+
+