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builtin-script.c
ansi_cprng.c 10.92 KiB
/*
* PRNG: Pseudo Random Number Generator
* Based on NIST Recommended PRNG From ANSI X9.31 Appendix A.2.4 using
* AES 128 cipher
*
* (C) Neil Horman <nhorman@tuxdriver.com>
*
* 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 (at your
* any later version.
*
*
*/
#include <crypto/internal/rng.h>
#include <linux/err.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/string.h>
#define DEFAULT_PRNG_KEY "0123456789abcdef"
#define DEFAULT_PRNG_KSZ 16
#define DEFAULT_BLK_SZ 16
#define DEFAULT_V_SEED "zaybxcwdveuftgsh"
/*
* Flags for the prng_context flags field
*/
#define PRNG_FIXED_SIZE 0x1
#define PRNG_NEED_RESET 0x2
/*
* Note: DT is our counter value
* I is our intermediate value
* V is our seed vector
* See http://csrc.nist.gov/groups/STM/cavp/documents/rng/931rngext.pdf
* for implementation details
*/
struct prng_context {
spinlock_t prng_lock;
unsigned char rand_data[DEFAULT_BLK_SZ];
unsigned char last_rand_data[DEFAULT_BLK_SZ];
unsigned char DT[DEFAULT_BLK_SZ];
unsigned char I[DEFAULT_BLK_SZ];
unsigned char V[DEFAULT_BLK_SZ];
u32 rand_data_valid;
struct crypto_cipher *tfm;
u32 flags;
};
static int dbg;
static void hexdump(char *note, unsigned char *buf, unsigned int len)
{
if (dbg) {
printk(KERN_CRIT "%s", note);
print_hex_dump(KERN_CONT, "", DUMP_PREFIX_OFFSET,
16, 1,
buf, len, false);
}
}
#define dbgprint(format, args...) do {\
if (dbg)\
printk(format, ##args);\