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author | 2015-08-28 09:58:54 +0800 | |
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committer | 2015-09-01 12:44:00 +0800 | |
commit | e44e3482bdb4d0ebde2d8b41830ac2cdb07948fb (patch) | |
tree | 66b09f592c55df2878107a468a91d21506104d3f /qemu/roms/ipxe/src/crypto/rbg.c | |
parent | 9ca8dbcc65cfc63d6f5ef3312a33184e1d726e00 (diff) |
Add qemu 2.4.0
Change-Id: Ic99cbad4b61f8b127b7dc74d04576c0bcbaaf4f5
Signed-off-by: Yang Zhang <yang.z.zhang@intel.com>
Diffstat (limited to 'qemu/roms/ipxe/src/crypto/rbg.c')
-rw-r--r-- | qemu/roms/ipxe/src/crypto/rbg.c | 115 |
1 files changed, 115 insertions, 0 deletions
diff --git a/qemu/roms/ipxe/src/crypto/rbg.c b/qemu/roms/ipxe/src/crypto/rbg.c new file mode 100644 index 000000000..e2d06978c --- /dev/null +++ b/qemu/roms/ipxe/src/crypto/rbg.c @@ -0,0 +1,115 @@ +/* + * Copyright (C) 2012 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 ); + +/** @file + * + * RBG mechanism + * + * This mechanism is designed to comply with ANS X9.82 Part 4 (April + * 2011 Draft) Section 10. This standard is unfortunately not freely + * available. + * + * The chosen RBG design is that of a DRBG with a live entropy source + * with no conditioning function. Only a single security strength is + * supported. No seedfile is used since there may be no non-volatile + * storage available. The system UUID is used as the personalisation + * string. + */ + +#include <stdint.h> +#include <string.h> +#include <ipxe/init.h> +#include <ipxe/settings.h> +#include <ipxe/uuid.h> +#include <ipxe/crypto.h> +#include <ipxe/drbg.h> +#include <ipxe/rbg.h> + +/** The RBG */ +struct random_bit_generator rbg; + +/** + * Start up RBG + * + * @ret rc Return status code + * + * This is the RBG_Startup function defined in ANS X9.82 Part 4 (April + * 2011 Draft) Section 9.1.2.2. + */ +static int rbg_startup ( void ) { + union uuid uuid; + int len; + int rc; + + /* Try to obtain system UUID for use as personalisation + * string, in accordance with ANS X9.82 Part 3-2007 Section + * 8.5.2. If no UUID is available, proceed without a + * personalisation string. + */ + if ( ( len = fetch_uuid_setting ( NULL, &uuid_setting, &uuid ) ) < 0 ) { + rc = len; + DBGC ( &rbg, "RBG could not fetch personalisation string: " + "%s\n", strerror ( rc ) ); + len = 0; + } + + /* Instantiate DRBG */ + if ( ( rc = drbg_instantiate ( &rbg.state, &uuid, len ) ) != 0 ) { + DBGC ( &rbg, "RBG could not instantiate DRBG: %s\n", + strerror ( rc ) ); + return rc; + } + + return 0; +} + +/** + * Shut down RBG + * + */ +static void rbg_shutdown ( void ) { + + /* Uninstantiate DRBG */ + drbg_uninstantiate ( &rbg.state ); +} + +/** RBG startup function */ +static void rbg_startup_fn ( void ) { + + /* Start up RBG. There is no way to report an error at this + * stage, but a failed startup will result in an invalid DRBG + * that refuses to generate bits. + */ + rbg_startup(); +} + +/** RBG shutdown function */ +static void rbg_shutdown_fn ( int booting __unused ) { + + /* Shut down RBG */ + rbg_shutdown(); +} + +/** RBG startup table entry */ +struct startup_fn startup_rbg __startup_fn ( STARTUP_NORMAL ) = { + .startup = rbg_startup_fn, + .shutdown = rbg_shutdown_fn, +}; |