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authorNeil Horman <nhorman@tuxdriver.com>2008-08-14 22:15:52 +1000
committerHerbert Xu <herbert@gondor.apana.org.au>2008-08-29 15:50:04 +1000
commit17f0f4a47df9aea9ee26c939f8057c35e0be1847 (patch)
treed6c7ff6c93573227a49c9e8fe06c53d97950e4e6
parentccb778e1841ce04b4c10b39f0dd2558ab2c6dcd4 (diff)
crypto: rng - RNG interface and implementation
This patch adds a random number generator interface as well as a cryptographic pseudo-random number generator based on AES. It is meant to be used in cases where a deterministic CPRNG is required. One of the first applications will be as an input in the IPsec IV generation process. Signed-off-by: Neil Horman <nhorman@tuxdriver.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
-rw-r--r--crypto/Kconfig16
-rw-r--r--crypto/Makefile4
-rw-r--r--crypto/ansi_cprng.c417
-rw-r--r--crypto/krng.c66
-rw-r--r--crypto/rng.c126
-rw-r--r--include/crypto/internal/rng.h26
-rw-r--r--include/crypto/rng.h75
-rw-r--r--include/linux/crypto.h25
8 files changed, 754 insertions, 1 deletions
diff --git a/crypto/Kconfig b/crypto/Kconfig
index a784c2dce57e..2274293e71e1 100644
--- a/crypto/Kconfig
+++ b/crypto/Kconfig
@@ -46,6 +46,10 @@ config CRYPTO_HASH
tristate
select CRYPTO_ALGAPI
+config CRYPTO_RNG
+ tristate
+ select CRYPTO_ALGAPI
+
config CRYPTO_MANAGER
tristate "Cryptographic algorithm manager"
select CRYPTO_AEAD
@@ -689,6 +693,18 @@ config CRYPTO_LZO
help
This is the LZO algorithm.
+comment "Random Number Generation"
+
+config CRYPTO_ANSI_CPRNG
+ tristate "Pseudo Random Number Generation for Cryptographic modules"
+ select CRYPTO_AES
+ select CRYPTO_RNG
+ select CRYPTO_FIPS
+ help
+ This option enables the generic pseudo random number generator
+ for cryptographic modules. Uses the Algorithm specified in
+ ANSI X9.31 A.2.4
+
source "drivers/crypto/Kconfig"
endif # if CRYPTO
diff --git a/crypto/Makefile b/crypto/Makefile
index 8a27b834ea76..5862b807334e 100644
--- a/crypto/Makefile
+++ b/crypto/Makefile
@@ -73,7 +73,9 @@ obj-$(CONFIG_CRYPTO_MICHAEL_MIC) += michael_mic.o
obj-$(CONFIG_CRYPTO_CRC32C) += crc32c.o
obj-$(CONFIG_CRYPTO_AUTHENC) += authenc.o
obj-$(CONFIG_CRYPTO_LZO) += lzo.o
-
+obj-$(CONFIG_CRYPTO_RNG) += rng.o
+obj-$(CONFIG_CRYPTO_RNG) += krng.o
+obj-$(CONFIG_CRYPTO_ANSI_CPRNG) += ansi_cprng.o
obj-$(CONFIG_CRYPTO_TEST) += tcrypt.o
#
diff --git a/crypto/ansi_cprng.c b/crypto/ansi_cprng.c
new file mode 100644
index 000000000000..72db0fd763cc
--- /dev/null
+++ b/crypto/ansi_cprng.c
@@ -0,0 +1,417 @@
+/*
+ * 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>
+
+#include "internal.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);\
+} while (0)
+
+static void xor_vectors(unsigned char *in1, unsigned char *in2,
+ unsigned char *out, unsigned int size)
+{
+ int i;
+
+ for (i = 0; i < size; i++)
+ out[i] = in1[i] ^ in2[i];
+
+}
+/*
+ * Returns DEFAULT_BLK_SZ bytes of random data per call
+ * returns 0 if generation succeded, <0 if something went wrong
+ */
+static int _get_more_prng_bytes(struct prng_context *ctx)
+{
+ int i;
+ unsigned char tmp[DEFAULT_BLK_SZ];
+ unsigned char *output = NULL;
+
+
+ dbgprint(KERN_CRIT "Calling _get_more_prng_bytes for context %p\n",
+ ctx);
+
+ hexdump("Input DT: ", ctx->DT, DEFAULT_BLK_SZ);
+ hexdump("Input I: ", ctx->I, DEFAULT_BLK_SZ);
+ hexdump("Input V: ", ctx->V, DEFAULT_BLK_SZ);
+
+ /*
+ * This algorithm is a 3 stage state machine
+ */
+ for (i = 0; i < 3; i++) {
+
+ switch (i) {
+ case 0:
+ /*
+ * Start by encrypting the counter value
+ * This gives us an intermediate value I
+ */
+ memcpy(tmp, ctx->DT, DEFAULT_BLK_SZ);
+ output = ctx->I;
+ hexdump("tmp stage 0: ", tmp, DEFAULT_BLK_SZ);
+ break;
+ case 1:
+
+ /*
+ * Next xor I with our secret vector V
+ * encrypt that result to obtain our
+ * pseudo random data which we output
+ */
+ xor_vectors(ctx->I, ctx->V, tmp, DEFAULT_BLK_SZ);
+ hexdump("tmp stage 1: ", tmp, DEFAULT_BLK_SZ);
+ output = ctx->rand_data;
+ break;
+ case 2:
+ /*
+ * First check that we didn't produce the same
+ * random data that we did last time around through this
+ */
+ if (!memcmp(ctx->rand_data, ctx->last_rand_data,
+ DEFAULT_BLK_SZ)) {
+ printk(KERN_ERR
+ "ctx %p Failed repetition check!\n",
+ ctx);
+ ctx->flags |= PRNG_NEED_RESET;
+ return -EINVAL;
+ }
+ memcpy(ctx->last_rand_data, ctx->rand_data,
+ DEFAULT_BLK_SZ);
+
+ /*
+ * Lastly xor the random data with I
+ * and encrypt that to obtain a new secret vector V
+ */
+ xor_vectors(ctx->rand_data, ctx->I, tmp,
+ DEFAULT_BLK_SZ);
+ output = ctx->V;
+ hexdump("tmp stage 2: ", tmp, DEFAULT_BLK_SZ);
+ break;
+ }
+
+
+ /* do the encryption */
+ crypto_cipher_encrypt_one(ctx->tfm, output, tmp);
+
+ }
+
+ /*
+ * Now update our DT value
+ */
+ for (i = 0; i < DEFAULT_BLK_SZ; i++) {
+ ctx->DT[i] += 1;
+ if (ctx->DT[i] != 0)
+ break;
+ }
+
+ dbgprint("Returning new block for context %p\n", ctx);
+ ctx->rand_data_valid = 0;
+
+ hexdump("Output DT: ", ctx->DT, DEFAULT_BLK_SZ);
+ hexdump("Output I: ", ctx->I, DEFAULT_BLK_SZ);
+ hexdump("Output V: ", ctx->V, DEFAULT_BLK_SZ);
+ hexdump("New Random Data: ", ctx->rand_data, DEFAULT_BLK_SZ);
+
+ return 0;
+}
+
+/* Our exported functions */
+static int get_prng_bytes(char *buf, size_t nbytes, struct prng_context *ctx)
+{
+ unsigned long flags;
+ unsigned char *ptr = buf;
+ unsigned int byte_count = (unsigned int)nbytes;
+ int err;
+
+
+ if (nbytes < 0)
+ return -EINVAL;
+
+ spin_lock_irqsave(&ctx->prng_lock, flags);
+
+ err = -EINVAL;
+ if (ctx->flags & PRNG_NEED_RESET)
+ goto done;
+
+ /*
+ * If the FIXED_SIZE flag is on, only return whole blocks of
+ * pseudo random data
+ */
+ err = -EINVAL;
+ if (ctx->flags & PRNG_FIXED_SIZE) {
+ if (nbytes < DEFAULT_BLK_SZ)
+ goto done;
+ byte_count = DEFAULT_BLK_SZ;
+ }
+
+ err = byte_count;
+
+ dbgprint(KERN_CRIT "getting %d random bytes for context %p\n",
+ byte_count, ctx);
+
+
+remainder:
+ if (ctx->rand_data_valid == DEFAULT_BLK_SZ) {
+ if (_get_more_prng_bytes(ctx) < 0) {
+ memset(buf, 0, nbytes);
+ err = -EINVAL;
+ goto done;
+ }
+ }
+
+ /*
+ * Copy up to the next whole block size
+ */
+ if (byte_count < DEFAULT_BLK_SZ) {
+ for (; ctx->rand_data_valid < DEFAULT_BLK_SZ;
+ ctx->rand_data_valid++) {
+ *ptr = ctx->rand_data[ctx->rand_data_valid];
+ ptr++;
+ byte_count--;
+ if (byte_count == 0)
+ goto done;
+ }
+ }
+
+ /*
+ * Now copy whole blocks
+ */
+ for (; byte_count >= DEFAULT_BLK_SZ; byte_count -= DEFAULT_BLK_SZ) {
+ if (_get_more_prng_bytes(ctx) < 0) {
+ memset(buf, 0, nbytes);
+ err = -EINVAL;
+ goto done;
+ }
+ memcpy(ptr, ctx->rand_data, DEFAULT_BLK_SZ);
+ ctx->rand_data_valid += DEFAULT_BLK_SZ;
+ ptr += DEFAULT_BLK_SZ;
+ }
+
+ /*
+ * Now copy any extra partial data
+ */
+ if (byte_count)
+ goto remainder;
+
+done:
+ spin_unlock_irqrestore(&ctx->prng_lock, flags);
+ dbgprint(KERN_CRIT "returning %d from get_prng_bytes in context %p\n",
+ err, ctx);
+ return err;
+}
+
+static void free_prng_context(struct prng_context *ctx)
+{
+ crypto_free_cipher(ctx->tfm);
+}
+
+static int reset_prng_context(struct prng_context *ctx,
+ unsigned char *key, size_t klen,
+ unsigned char *V, unsigned char *DT)
+{
+ int ret;
+ int rc = -EINVAL;
+ unsigned char *prng_key;
+
+ spin_lock(&ctx->prng_lock);
+ ctx->flags |= PRNG_NEED_RESET;
+
+ prng_key = (key != NULL) ? key : (unsigned char *)DEFAULT_PRNG_KEY;
+
+ if (!key)
+ klen = DEFAULT_PRNG_KSZ;
+
+ if (V)
+ memcpy(ctx->V, V, DEFAULT_BLK_SZ);
+ else
+ memcpy(ctx->V, DEFAULT_V_SEED, DEFAULT_BLK_SZ);
+
+ if (DT)
+ memcpy(ctx->DT, DT, DEFAULT_BLK_SZ);
+ else
+ memset(ctx->DT, 0, DEFAULT_BLK_SZ);
+
+ memset(ctx->rand_data, 0, DEFAULT_BLK_SZ);
+ memset(ctx->last_rand_data, 0, DEFAULT_BLK_SZ);
+
+ if (ctx->tfm)
+ crypto_free_cipher(ctx->tfm);
+
+ ctx->tfm = crypto_alloc_cipher("aes", 0, 0);
+ if (IS_ERR(ctx->tfm)) {
+ dbgprint(KERN_CRIT "Failed to alloc tfm for context %p\n",
+ ctx);
+ ctx->tfm = NULL;
+ goto out;
+ }
+
+ ctx->rand_data_valid = DEFAULT_BLK_SZ;
+
+ ret = crypto_cipher_setkey(ctx->tfm, prng_key, klen);
+ if (ret) {
+ dbgprint(KERN_CRIT "PRNG: setkey() failed flags=%x\n",
+ crypto_cipher_get_flags(ctx->tfm));
+ crypto_free_cipher(ctx->tfm);
+ goto out;
+ }
+
+ rc = 0;
+ ctx->flags &= ~PRNG_NEED_RESET;
+out:
+ spin_unlock(&ctx->prng_lock);
+
+ return rc;
+
+}
+
+static int cprng_init(struct crypto_tfm *tfm)
+{
+ struct prng_context *ctx = crypto_tfm_ctx(tfm);
+
+ spin_lock_init(&ctx->prng_lock);
+
+ return reset_prng_context(ctx, NULL, DEFAULT_PRNG_KSZ, NULL, NULL);
+}
+
+static void cprng_exit(struct crypto_tfm *tfm)
+{
+ free_prng_context(crypto_tfm_ctx(tfm));
+}
+
+static int cprng_get_random(struct crypto_rng *tfm, u8 *rdata,
+ unsigned int dlen)
+{
+ struct prng_context *prng = crypto_rng_ctx(tfm);
+
+ return get_prng_bytes(rdata, dlen, prng);
+}
+
+static int cprng_reset(struct crypto_rng *tfm, u8 *seed, unsigned int slen)
+{
+ struct prng_context *prng = crypto_rng_ctx(tfm);
+ u8 *key = seed + DEFAULT_PRNG_KSZ;
+
+ if (slen < DEFAULT_PRNG_KSZ + DEFAULT_BLK_SZ)
+ return -EINVAL;
+
+ reset_prng_context(prng, key, DEFAULT_PRNG_KSZ, seed, NULL);
+
+ if (prng->flags & PRNG_NEED_RESET)
+ return -EINVAL;
+ return 0;
+}
+
+static struct crypto_alg rng_alg = {
+ .cra_name = "stdrng",
+ .cra_driver_name = "ansi_cprng",
+ .cra_priority = 100,
+ .cra_flags = CRYPTO_ALG_TYPE_RNG,
+ .cra_ctxsize = sizeof(struct prng_context),
+ .cra_type = &crypto_rng_type,
+ .cra_module = THIS_MODULE,
+ .cra_list = LIST_HEAD_INIT(rng_alg.cra_list),
+ .cra_init = cprng_init,
+ .cra_exit = cprng_exit,
+ .cra_u = {
+ .rng = {
+ .rng_make_random = cprng_get_random,
+ .rng_reset = cprng_reset,
+ .seedsize = DEFAULT_PRNG_KSZ + DEFAULT_BLK_SZ,
+ }
+ }
+};
+
+
+/* Module initalization */
+static int __init prng_mod_init(void)
+{
+ int ret = 0;
+
+ if (fips_enabled)
+ rng_alg.cra_priority += 200;
+
+ ret = crypto_register_alg(&rng_alg);
+
+ if (ret)
+ goto out;
+out:
+ return 0;
+}
+
+static void __exit prng_mod_fini(void)
+{
+ crypto_unregister_alg(&rng_alg);
+ return;
+}
+
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("Software Pseudo Random Number Generator");
+MODULE_AUTHOR("Neil Horman <nhorman@tuxdriver.com>");
+module_param(dbg, int, 0);
+MODULE_PARM_DESC(dbg, "Boolean to enable debugging (0/1 == off/on)");
+module_init(prng_mod_init);
+module_exit(prng_mod_fini);
+MODULE_ALIAS("stdrng");
diff --git a/crypto/krng.c b/crypto/krng.c
new file mode 100644
index 000000000000..4328bb3430ed
--- /dev/null
+++ b/crypto/krng.c
@@ -0,0 +1,66 @@
+/*
+ * RNG implementation using standard kernel RNG.
+ *
+ * Copyright (c) 2008 Herbert Xu <herbert@gondor.apana.org.au>
+ *
+ * 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/random.h>
+
+static int krng_get_random(struct crypto_rng *tfm, u8 *rdata, unsigned int dlen)
+{
+ get_random_bytes(rdata, dlen);
+ return 0;
+}
+
+static int krng_reset(struct crypto_rng *tfm, u8 *seed, unsigned int slen)
+{
+ return 0;
+}
+
+static struct crypto_alg krng_alg = {
+ .cra_name = "stdrng",
+ .cra_driver_name = "krng",
+ .cra_priority = 200,
+ .cra_flags = CRYPTO_ALG_TYPE_RNG,
+ .cra_ctxsize = 0,
+ .cra_type = &crypto_rng_type,
+ .cra_module = THIS_MODULE,
+ .cra_list = LIST_HEAD_INIT(krng_alg.cra_list),
+ .cra_u = {
+ .rng = {
+ .rng_make_random = krng_get_random,
+ .rng_reset = krng_reset,
+ .seedsize = 0,
+ }
+ }
+};
+
+
+/* Module initalization */
+static int __init krng_mod_init(void)
+{
+ return crypto_register_alg(&krng_alg);
+}
+
+static void __exit krng_mod_fini(void)
+{
+ crypto_unregister_alg(&krng_alg);
+ return;
+}
+
+module_init(krng_mod_init);
+module_exit(krng_mod_fini);
+
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("Kernel Random Number Generator");
+MODULE_ALIAS("stdrng");
diff --git a/crypto/rng.c b/crypto/rng.c
new file mode 100644
index 000000000000..6e94bc735578
--- /dev/null
+++ b/crypto/rng.c
@@ -0,0 +1,126 @@
+/*
+ * Cryptographic API.
+ *
+ * RNG operations.
+ *
+ * Copyright (c) 2008 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 option)
+ * any later version.
+ *
+ */
+
+#include <asm/atomic.h>
+#include <crypto/internal/rng.h>
+#include <linux/err.h>
+#include <linux/module.h>
+#include <linux/mutex.h>
+#include <linux/random.h>
+#include <linux/seq_file.h>
+#include <linux/string.h>
+
+static DEFINE_MUTEX(crypto_default_rng_lock);
+struct crypto_rng *crypto_default_rng;
+EXPORT_SYMBOL_GPL(crypto_default_rng);
+static int crypto_default_rng_refcnt;
+
+static int rngapi_reset(struct crypto_rng *tfm, u8 *seed, unsigned int slen)
+{
+ u8 *buf = NULL;
+ int err;
+
+ if (!seed && slen) {
+ buf = kmalloc(slen, GFP_KERNEL);
+ if (!buf)
+ return -ENOMEM;
+
+ get_random_bytes(buf, slen);
+ seed = buf;
+ }
+
+ err = crypto_rng_alg(tfm)->rng_reset(tfm, seed, slen);
+
+ kfree(buf);
+ return err;
+}
+
+static int crypto_init_rng_ops(struct crypto_tfm *tfm, u32 type, u32 mask)
+{
+ struct rng_alg *alg = &tfm->__crt_alg->cra_rng;
+ struct rng_tfm *ops = &tfm->crt_rng;
+
+ ops->rng_gen_random = alg->rng_make_random;
+ ops->rng_reset = rngapi_reset;
+
+ return 0;
+}
+
+static void crypto_rng_show(struct seq_file *m, struct crypto_alg *alg)
+ __attribute__ ((unused));
+static void crypto_rng_show(struct seq_file *m, struct crypto_alg *alg)
+{
+ seq_printf(m, "type : rng\n");
+ seq_printf(m, "seedsize : %u\n", alg->cra_rng.seedsize);
+}
+
+static unsigned int crypto_rng_ctxsize(struct crypto_alg *alg, u32 type,
+ u32 mask)
+{
+ return alg->cra_ctxsize;
+}
+
+const struct crypto_type crypto_rng_type = {
+ .ctxsize = crypto_rng_ctxsize,
+ .init = crypto_init_rng_ops,
+#ifdef CONFIG_PROC_FS
+ .show = crypto_rng_show,
+#endif
+};
+EXPORT_SYMBOL_GPL(crypto_rng_type);
+
+int crypto_get_default_rng(void)
+{
+ struct crypto_rng *rng;
+ int err;
+
+ mutex_lock(&crypto_default_rng_lock);
+ if (!crypto_default_rng) {
+ rng = crypto_alloc_rng("stdrng", 0, 0);
+ err = PTR_ERR(rng);
+ if (IS_ERR(rng))
+ goto unlock;
+
+ err = crypto_rng_reset(rng, NULL, crypto_rng_seedsize(rng));
+ if (err) {
+ crypto_free_rng(rng);
+ goto unlock;
+ }
+
+ crypto_default_rng = rng;
+ }
+
+ crypto_default_rng_refcnt++;
+ err = 0;
+
+unlock:
+ mutex_unlock(&crypto_default_rng_lock);
+
+ return err;
+}
+EXPORT_SYMBOL_GPL(crypto_get_default_rng);
+
+void crypto_put_default_rng(void)
+{
+ mutex_lock(&crypto_default_rng_lock);
+ if (!--crypto_default_rng_refcnt) {
+ crypto_free_rng(crypto_default_rng);
+ crypto_default_rng = NULL;
+ }
+ mutex_unlock(&crypto_default_rng_lock);
+}
+EXPORT_SYMBOL_GPL(crypto_put_default_rng);
+
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("Random Number Genertor");
diff --git a/include/crypto/internal/rng.h b/include/crypto/internal/rng.h
new file mode 100644
index 000000000000..896973369573
--- /dev/null
+++ b/include/crypto/internal/rng.h
@@ -0,0 +1,26 @@
+/*
+ * RNG: Random Number Generator algorithms under the crypto API
+ *
+ * Copyright (c) 2008 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 option)
+ * any later version.
+ *
+ */
+
+#ifndef _CRYPTO_INTERNAL_RNG_H
+#define _CRYPTO_INTERNAL_RNG_H
+
+#include <crypto/algapi.h>
+#include <crypto/rng.h>
+
+extern const struct crypto_type crypto_rng_type;
+
+static inline void *crypto_rng_ctx(struct crypto_rng *tfm)
+{
+ return crypto_tfm_ctx(&tfm->base);
+}
+
+#endif
diff --git a/include/crypto/rng.h b/include/crypto/rng.h
new file mode 100644
index 000000000000..c93f9b917925
--- /dev/null
+++ b/include/crypto/rng.h
@@ -0,0 +1,75 @@
+/*
+ * RNG: Random Number Generator algorithms under the crypto API
+ *
+ * Copyright (c) 2008 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 option)
+ * any later version.
+ *
+ */
+
+#ifndef _CRYPTO_RNG_H
+#define _CRYPTO_RNG_H
+
+#include <linux/crypto.h>
+
+extern struct crypto_rng *crypto_default_rng;
+
+int crypto_get_default_rng(void);
+void crypto_put_default_rng(void);
+
+static inline struct crypto_rng *__crypto_rng_cast(struct crypto_tfm *tfm)
+{
+ return (struct crypto_rng *)tfm;
+}
+
+static inline struct crypto_rng *crypto_alloc_rng(const char *alg_name,
+ u32 type, u32 mask)
+{
+ type &= ~CRYPTO_ALG_TYPE_MASK;
+ type |= CRYPTO_ALG_TYPE_RNG;
+ mask |= CRYPTO_ALG_TYPE_MASK;
+
+ return __crypto_rng_cast(crypto_alloc_base(alg_name, type, mask));
+}
+
+static inline struct crypto_tfm *crypto_rng_tfm(struct crypto_rng *tfm)
+{
+ return &tfm->base;
+}
+
+static inline struct rng_alg *crypto_rng_alg(struct crypto_rng *tfm)
+{
+ return &crypto_rng_tfm(tfm)->__crt_alg->cra_rng;
+}
+
+static inline struct rng_tfm *crypto_rng_crt(struct crypto_rng *tfm)
+{
+ return &crypto_rng_tfm(tfm)->crt_rng;
+}
+
+static inline void crypto_free_rng(struct crypto_rng *tfm)
+{
+ crypto_free_tfm(crypto_rng_tfm(tfm));
+}
+
+static inline int crypto_rng_get_bytes(struct crypto_rng *tfm,
+ u8 *rdata, unsigned int dlen)
+{
+ return crypto_rng_crt(tfm)->rng_gen_random(tfm, rdata, dlen);
+}
+
+static inline int crypto_rng_reset(struct crypto_rng *tfm,
+ u8 *seed, unsigned int slen)
+{
+ return crypto_rng_crt(tfm)->rng_reset(tfm, seed, slen);
+}
+
+static inline int crypto_rng_seedsize(struct crypto_rng *tfm)
+{
+ return crypto_rng_alg(tfm)->seedsize;
+}
+
+#endif
diff --git a/include/linux/crypto.h b/include/linux/crypto.h
index 81d994a3bdaf..3d2317e4af2e 100644
--- a/include/linux/crypto.h
+++ b/include/linux/crypto.h
@@ -38,6 +38,7 @@
#define CRYPTO_ALG_TYPE_DIGEST 0x00000008
#define CRYPTO_ALG_TYPE_HASH 0x00000009
#define CRYPTO_ALG_TYPE_AHASH 0x0000000a
+#define CRYPTO_ALG_TYPE_RNG 0x0000000c
#define CRYPTO_ALG_TYPE_HASH_MASK 0x0000000e
#define CRYPTO_ALG_TYPE_AHASH_MASK 0x0000000c
@@ -113,6 +114,7 @@ struct crypto_aead;
struct crypto_blkcipher;
struct crypto_hash;
struct crypto_ahash;
+struct crypto_rng;
struct crypto_tfm;
struct crypto_type;
struct aead_givcrypt_request;
@@ -298,6 +300,15 @@ struct compress_alg {
unsigned int slen, u8 *dst, unsigned int *dlen);
};
+struct rng_alg {
+ int (*rng_make_random)(struct crypto_rng *tfm, u8 *rdata,
+ unsigned int dlen);
+ int (*rng_reset)(struct crypto_rng *tfm, u8 *seed, unsigned int slen);
+
+ unsigned int seedsize;
+};
+
+
#define cra_ablkcipher cra_u.ablkcipher
#define cra_aead cra_u.aead
#define cra_blkcipher cra_u.blkcipher
@@ -306,6 +317,7 @@ struct compress_alg {
#define cra_hash cra_u.hash
#define cra_ahash cra_u.ahash
#define cra_compress cra_u.compress
+#define cra_rng cra_u.rng
struct crypto_alg {
struct list_head cra_list;
@@ -333,6 +345,7 @@ struct crypto_alg {
struct hash_alg hash;
struct ahash_alg ahash;
struct compress_alg compress;
+ struct rng_alg rng;
} cra_u;
int (*cra_init)(struct crypto_tfm *tfm);
@@ -438,6 +451,12 @@ struct compress_tfm {
u8 *dst, unsigned int *dlen);
};
+struct rng_tfm {
+ int (*rng_gen_random)(struct crypto_rng *tfm, u8 *rdata,
+ unsigned int dlen);
+ int (*rng_reset)(struct crypto_rng *tfm, u8 *seed, unsigned int slen);
+};
+
#define crt_ablkcipher crt_u.ablkcipher
#define crt_aead crt_u.aead
#define crt_blkcipher crt_u.blkcipher
@@ -445,6 +464,7 @@ struct compress_tfm {
#define crt_hash crt_u.hash
#define crt_ahash crt_u.ahash
#define crt_compress crt_u.compress
+#define crt_rng crt_u.rng
struct crypto_tfm {
@@ -458,6 +478,7 @@ struct crypto_tfm {
struct hash_tfm hash;
struct ahash_tfm ahash;
struct compress_tfm compress;
+ struct rng_tfm rng;
} crt_u;
struct crypto_alg *__crt_alg;
@@ -489,6 +510,10 @@ struct crypto_hash {
struct crypto_tfm base;
};
+struct crypto_rng {
+ struct crypto_tfm base;
+};
+
enum {
CRYPTOA_UNSPEC,
CRYPTOA_ALG,

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