initially checkin

1 files changed, 126 insertions, 0 deletions

diff --git a/g10/passphrase.c b/g10/passphrase.c
new file mode 100644
index 000000000..c95b27bbd
--- /dev/null
+++ b/g10/passphrase.c
@@ -0,0 +1,126 @@
+/* passphrase.c -  Get a passphrase
+ *	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 <assert.h>
+#include "util.h"
+#include "memory.h"
+#include "ttyio.h"
+#include "cipher.h"
+
+
+static int hash_passphrase( DEK *dek, char *pw );
+
+
+/****************
+ * Get a passphrase for the secret key with KEYID, display TEXT
+ * if the user needs to enter the passphrase.
+ * Returns: m_alloced md5 passphrase hash; caller must free
+ */
+DEK *
+get_passphrase_hash( u32 *keyid, char *text )
+{
+    char *p=NULL, *pw;
+    DEK *dek;
+
+    if( keyid ) {
+	tty_printf("Need a pass phrase to unlock the secret key!\n");
+	tty_printf("KeyID: %08lX\n\n",  keyid[1] );
+    }
+    if( keyid && (p=getenv("PGPPATHPHRASE")) ) {
+	pw = m_alloc_secure(strlen(p)+1);
+	strcpy(pw,p);
+	tty_printf("Taking it from $PGPPATHPHRASE !\n",  keyid[1] );
+    }
+    else
+	pw = tty_get_hidden("Enter pass phrase: " );
+    dek = m_alloc_secure( sizeof *dek );
+    dek->algo = CIPHER_ALGO_BLOWFISH;
+    if( hash_passphrase( dek, pw ) )
+	log_bug("get_passphrase_hash\n");
+    m_free(pw); /* is allocated in secure memory, so it will be burned */
+    if( !p ) {
+	tty_kill_prompt();
+	tty_printf("\n\n");
+    }
+    return dek;
+}
+
+
+/****************
+ * This function is used to construct a DEK from a user input.
+ * It uses the default CIPHER
+ */
+int
+make_dek_from_passphrase( DEK *dek, int mode )
+{
+    char *pw, *pw2;
+    int rc=0;
+
+    pw = tty_get_hidden("Enter pass phrase: " );
+    tty_kill_prompt();
+    if( mode == 2 ) {
+	pw2 = tty_get_hidden("Repeat pass phrase: " );
+	if( strcmp(pw, pw2) ) {
+	    m_free(pw2);
+	    m_free(pw);
+	    return G10ERR_PASSPHRASE;
+	}
+	m_free(pw2);
+    }
+    rc = hash_passphrase( dek, pw );
+    m_free(pw);
+    return rc;
+}
+
+
+static int
+hash_passphrase( DEK *dek, char *pw )
+{
+    int rc = 0;
+
+    dek->keylen = 0;
+    if( dek->algo == CIPHER_ALGO_IDEA ) {
+	MD5HANDLE md5;
+
+	md5 = md5_open(1);
+	md5_write( md5, pw, strlen(pw) );
+	md5_final( md5 );
+	dek->keylen = 16;
+	memcpy( dek->key, md5_read(md5), dek->keylen );
+	md5_close(md5);
+    }
+    else if( dek->algo == CIPHER_ALGO_BLOWFISH ) {
+	RMDHANDLE rmd;
+
+	rmd = rmd160_open(1);
+	rmd160_write( rmd, pw, strlen(pw) );
+	dek->keylen = 20;
+	memcpy( dek->key, rmd160_final(rmd), dek->keylen );
+	rmd160_close(rmd);
+    }
+    else
+	rc = G10ERR_UNSUPPORTED;
+    return rc;
+}
+