Add qemu 2.4.0

[kvmfornfv.git] / qemu / roms / ipxe / src / crypto / chap.c

diff --git a/qemu/roms/ipxe/src/crypto/chap.c b/qemu/roms/ipxe/src/crypto/chap.c
new file mode 100644 (file)
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+++ b/qemu/roms/ipxe/src/crypto/chap.c
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+/*
+ * Copyright (C) 2006 Michael Brown <mbrown@fensystems.co.uk>.
+ *
+ * This program 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 any later version.
+ *
+ * This program 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., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301, USA.
+ */
+
+FILE_LICENCE ( GPL2_OR_LATER );
+
+#include <stddef.h>
+#include <stdlib.h>
+#include <string.h>
+#include <errno.h>
+#include <assert.h>
+#include <ipxe/crypto.h>
+#include <ipxe/chap.h>
+
+/** @file
+ *
+ * CHAP protocol
+ *
+ */
+
+/**
+ * Initialise CHAP challenge/response
+ *
+ * @v chap             CHAP challenge/response
+ * @v digest           Digest algorithm to use
+ * @ret rc             Return status code
+ *
+ * Initialises a CHAP challenge/response structure.  This routine
+ * allocates memory, and so may fail.  The allocated memory must
+ * eventually be freed by a call to chap_finish().
+ */
+int chap_init ( struct chap_response *chap,
+               struct digest_algorithm *digest ) {
+       size_t state_len;
+       void *state;
+
+       assert ( chap->digest == NULL );
+       assert ( chap->digest_context == NULL );
+       assert ( chap->response == NULL );
+
+       DBG ( "CHAP %p initialising with %s digest\n", chap, digest->name );
+
+       state_len = ( digest->ctxsize + digest->digestsize );
+       state = malloc ( state_len );
+       if ( ! state ) {
+               DBG ( "CHAP %p could not allocate %zd bytes for state\n",
+                     chap, state_len );
+               return -ENOMEM;
+       }
+       
+       chap->digest = digest;
+       chap->digest_context = state;
+       chap->response = ( state + digest->ctxsize );
+       chap->response_len = digest->digestsize;
+       digest_init ( chap->digest, chap->digest_context );
+       return 0;
+}
+
+/**
+ * Add data to the CHAP challenge
+ *
+ * @v chap             CHAP response
+ * @v data             Data to add
+ * @v len              Length of data to add
+ */
+void chap_update ( struct chap_response *chap, const void *data,
+                  size_t len ) {
+       assert ( chap->digest != NULL );
+       assert ( chap->digest_context != NULL );
+
+       if ( ! chap->digest )
+               return;
+
+       digest_update ( chap->digest, chap->digest_context, data, len );
+}
+
+/**
+ * Respond to the CHAP challenge
+ *
+ * @v chap             CHAP response
+ *
+ * Calculates the final CHAP response value, and places it in @c
+ * chap->response, with a length of @c chap->response_len.
+ */
+void chap_respond ( struct chap_response *chap ) {
+       assert ( chap->digest != NULL );
+       assert ( chap->digest_context != NULL );
+       assert ( chap->response != NULL );
+
+       DBG ( "CHAP %p responding to challenge\n", chap );
+
+       if ( ! chap->digest )
+               return;
+
+       digest_final ( chap->digest, chap->digest_context, chap->response );
+}
+
+/**
+ * Free resources used by a CHAP response
+ *
+ * @v chap             CHAP response
+ */
+void chap_finish ( struct chap_response *chap ) {
+       void *state = chap->digest_context;
+
+       DBG ( "CHAP %p finished\n", chap );
+
+       free ( state );
+       memset ( chap, 0, sizeof ( *chap ) );
+}