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Add entropy pool and strong random number generator
Entropy pool gathers environmental noise from device drivers, user-space, etc., and returns good random numbers, suitable for cryptographic use. Based on entropy pool design from *BSDs and uses BLAKE2Xs algorithm for CSPRNG output. Patch also adds /dev/urandom support for using entropy pool RNG and new 'getrandom' system call for getting randomness without file-descriptor usage (thus avoiding file-descriptor exhaustion attacks). The 'getrandom' interface is similar as 'getentropy' and 'getrandom' available on OpenBSD and Linux respectively.
This commit is contained in:
Jussi Kivilinna
committed by
Gregory Nutt
Gregory Nutt
parent
21545ab643
commit
dffb8a67e3
@@ -646,4 +646,20 @@ void board_crashdump(uintptr_t currentsp, FAR void *tcb,
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int lineno);
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#endif
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/****************************************************************************
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* Name: board_initrngseed
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*
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* Description:
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* If CONFIG_BOARD_INITRNGSEED is selected then board_init_rngseed is
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* called at up_randompool_initialize() to feed initial random seed
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* to RNG. Implemenation of this functions should feed at least
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* MIN_SEED_NEW_ENTROPY_WORDS 32-bit random words to entropy-pool using
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* up_rngaddentropy() or up_rngaddint().
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*
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****************************************************************************/
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#ifdef CONFIG_BOARD_INITRNGSEED
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void board_init_rngseed(void);
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#endif
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#endif /* __INCLUDE_NUTTX_BOARD_H */
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@@ -0,0 +1,197 @@
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/****************************************************************************
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* include/nuttx/crypto/blake2s.h
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*
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* This code is based on public-domain/CC0 BLAKE2 reference implementation
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* by Samual Neves, at https://github.com/BLAKE2/BLAKE2/tree/master/ref
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* Copyright 2012, Samuel Neves <sneves@dei.uc.pt>
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*
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* Copyright (C) 2017 Haltian Ltd. All rights reserved.
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* Authors: Jussi Kivilinna <jussi.kivilinna@haltian.com>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name NuttX nor the names of its contributors may be
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* used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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****************************************************************************/
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#ifndef __INCLUDE_NUTTX_CRYPTO_BLAKE2S_H
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#define __INCLUDE_NUTTX_CRYPTO_BLAKE2S_H
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#include <stdint.h>
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#ifdef __cplusplus
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extern "C"
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{
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#endif
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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/****************************************************************************
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* Public Types
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****************************************************************************/
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enum blake2s_constant
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{
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BLAKE2S_BLOCKBYTES = 64,
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BLAKE2S_OUTBYTES = 32,
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BLAKE2S_KEYBYTES = 32,
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BLAKE2S_SALTBYTES = 8,
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BLAKE2S_PERSONALBYTES = 8
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};
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typedef struct blake2s_state__
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{
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uint32_t h[8];
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uint32_t t[2];
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uint32_t f[2];
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size_t buflen;
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size_t outlen;
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uint8_t buf[BLAKE2S_BLOCKBYTES];
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} blake2s_state;
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typedef struct blake2s_param__
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{
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uint8_t digest_length; /* 1 */
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uint8_t key_length; /* 2 */
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uint8_t fanout; /* 3 */
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uint8_t depth; /* 4 */
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uint8_t leaf_length[4]; /* 8 */
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uint8_t node_offset[4]; /* 12 */
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uint8_t xof_length[2]; /* 14 */
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uint8_t node_depth; /* 15 */
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uint8_t inner_length; /* 16 */
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/* uint8_t reserved[0]; */
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uint8_t salt[BLAKE2S_SALTBYTES]; /* 24 */
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uint8_t personal[BLAKE2S_PERSONALBYTES]; /* 32 */
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} blake2s_param;
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#ifdef __GNUC__ > 3
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#define BLAKE2_UNALIGNED 1
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typedef uint32_t uint32_alias_t __attribute__((may_alias, aligned(1)));
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typedef uint16_t uint16_alias_t __attribute__((may_alias, aligned(1)));
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#endif
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/****************************************************************************
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* Public Function Prototypes
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****************************************************************************/
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/* Streaming API */
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int blake2s_init(FAR blake2s_state *S, size_t outlen);
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int blake2s_init_key(FAR blake2s_state *S, size_t outlen, FAR const void *key,
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size_t keylen);
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int blake2s_init_param(FAR blake2s_state *S, FAR const blake2s_param *P);
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int blake2s_update(FAR blake2s_state *S, FAR const void *in, size_t inlen);
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int blake2s_final(FAR blake2s_state *S, FAR void *out, size_t outlen);
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/* Simple API */
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int blake2s(FAR void *out, size_t outlen, FAR const void *in, size_t inlen,
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FAR const void *key, size_t keylen);
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/****************************************************************************
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* Public Inline Functions
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****************************************************************************/
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static inline uint32_t blake2_load32(FAR const void *src)
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{
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#if defined(BLAKE2_UNALIGNED) && !defined(CONFIG_ENDIAN_BIG)
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return *(FAR uint32_alias_t *)src;
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#elif !defined(CONFIG_ENDIAN_BIG)
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FAR const uint8_t *p = (FAR const uint8_t *)src;
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return ((uint32_t)(p[0]) << 24) |
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((uint32_t)(p[1]) << 16) |
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((uint32_t)(p[2]) << 8) |
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((uint32_t)(p[3]) << 0);
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#else
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FAR const uint8_t *p = (FAR const uint8_t *)src;
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return ((uint32_t)(p[0]) << 0) |
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((uint32_t)(p[1]) << 8) |
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((uint32_t)(p[2]) << 16) |
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((uint32_t)(p[3]) << 24);
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#endif
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}
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static inline uint16_t blake2_load16(FAR const void *src)
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{
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#if defined(BLAKE2_UNALIGNED) && !defined(CONFIG_ENDIAN_BIG)
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return *(FAR uint16_alias_t *)src;
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#elif !defined(CONFIG_ENDIAN_BIG)
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const uint8_t *p = (FAR const uint8_t *)src;
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return ((uint16_t)(p[0]) << 8) | ((uint16_t)(p[1]) << 0);
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#else
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const uint8_t *p = (FAR const uint8_t *)src;
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return ((uint16_t)(p[0]) << 0) | ((uint16_t)(p[1]) << 8);
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#endif
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}
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static inline void blake2_store16(FAR void *dst, uint16_t w)
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{
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#if defined(BLAKE2_UNALIGNED) && !defined(CONFIG_ENDIAN_BIG)
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*(FAR uint16_alias_t *)dst = w;
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#elif !defined(CONFIG_ENDIAN_BIG)
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FAR uint8_t *p = (FAR uint8_t *)dst;
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p[1] = (uint8_t)w; w >>= 8;
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p[0] = (uint8_t)w;
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#else
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FAR uint8_t *p = (FAR uint8_t *)dst;
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p[0] = (uint8_t)w; w >>= 8;
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p[1] = (uint8_t)w;
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#endif
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}
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static inline void blake2_store32(FAR void *dst, uint32_t w)
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{
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#if defined(BLAKE2_UNALIGNED) && !defined(CONFIG_ENDIAN_BIG)
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*(FAR uint32_alias_t *)dst = w;
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#elif !defined(CONFIG_ENDIAN_BIG)
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FAR uint8_t *p = (FAR uint8_t *) dst;
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p[0] = (uint8_t)(w >> 24);
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p[1] = (uint8_t)(w >> 16);
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p[2] = (uint8_t)(w >> 8);
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p[3] = (uint8_t)(w >> 0);
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#else
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FAR uint8_t *p = (FAR uint8_t *) dst;
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p[0] = (uint8_t)(w >> 0);
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p[1] = (uint8_t)(w >> 8);
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p[2] = (uint8_t)(w >> 16);
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p[3] = (uint8_t)(w >> 24);
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#endif
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}
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#ifdef __cplusplus
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}
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#endif
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#endif /* __INCLUDE_NUTTX_CRYPTO_BLAKE2S_H */
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@@ -0,0 +1,171 @@
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/****************************************************************************
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* include/nuttx/random.h
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*
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* Copyright (C) 2015-2017 Haltian Ltd. All rights reserved.
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* Authors: Juha Niskanen <juha.niskanen@haltian.com>
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* Jussi Kivilinna <jussi.kivilinna@haltian.com>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
|
||||
* notice, this list of conditions and the following disclaimer.
|
||||
* 2. Redistributions in binary form must reproduce the above copyright
|
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* notice, this list of conditions and the following disclaimer in
|
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name NuttX nor the names of its contributors may be
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* used to endorse or promote products derived from this software
|
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
|
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
|
||||
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
|
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
|
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
|
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
|
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
|
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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****************************************************************************/
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#ifndef __INCLUDE_NUTTX_RANDOM_H
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#define __INCLUDE_NUTTX_RANDOM_H
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#include <stddef.h>
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#include <sys/random.h> /* getrandom() */
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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/* Size of entropy pool in 32-bit integers, must be power of two */
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#define ENTROPY_POOL_SIZE 128
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#define add_irq_randomness(x) up_rngaddint(RND_SRC_IRQ, (x))
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#define add_sensor_randomness(x) up_rngaddint(RND_SRC_SENSOR, (x))
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#define add_time_randomness(x) up_rngaddint(RND_SRC_TIME, (x))
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#define add_hw_randomness(x) up_rngaddint(RND_SRC_HW, (x))
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#define add_sw_randomness(x) up_rngaddint(RND_SRC_SW, (x))
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#define add_ui_randomness(x) up_rngaddint(RND_SRC_UI, (x))
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/* Allow above macros to always exist in source without ifdefs */
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#ifndef CONFIG_CRYPTO_RANDOM_POOL
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# define up_rngaddint(k, x) ((void)(k),(void)(x))
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# define up_rngaddentropy(k, buf, n) ((void)(k),(void)(buf),(void)(x))
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#endif
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/****************************************************************************
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* Public Type Definitions
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****************************************************************************/
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/* Entropy pool structure */
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struct entropy_pool_s
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{
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volatile uint32_t pool[ENTROPY_POOL_SIZE];
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};
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/* Randomness sources */
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enum rnd_source_t
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{
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RND_SRC_TIME = 0,
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RND_SRC_IRQ,
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RND_SRC_SENSOR,
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RND_SRC_HW, /* unique per HW UID or coming from factory line. */
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RND_SRC_SW, /* unique per SW version. */
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RND_SRC_UI /* buttons etc. user-visible interface elements. */
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};
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/****************************************************************************
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* Public Data
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****************************************************************************/
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#ifdef CONFIG_BOARD_ENTROPY_POOL
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/* Entropy pool structure can be provided by board source. Use for this is,
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* for example, allocate entropy pool from special area of RAM which content
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* is kept over system reset. */
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extern struct entropy_pool_s board_entropy_pool;
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#endif
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/****************************************************************************
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* Public Function Prototypes
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****************************************************************************/
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#ifdef CONFIG_CRYPTO_RANDOM_POOL
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/****************************************************************************
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* Function: up_rngaddint
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*
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* Description:
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* Add one integer to entropy pool, contributing a specific kind
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* of entropy to pool.
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*
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* Parameters:
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* kindof - Enumeration constant telling where val came from
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* val - Integer to be added
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*
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* Returned Value:
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* None
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*
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****************************************************************************/
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void up_rngaddint(enum rnd_source_t kindof, int val);
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/****************************************************************************
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* Function: up_rngaddentropy
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*
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* Description:
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* Add buffer of integers to entropy pool.
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*
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* Parameters:
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* kindof - Enumeration constant telling where val came from
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* buf - Buffer of integers to be added
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* n - Number of elements in buf
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*
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* Returned Value:
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* None
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*
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****************************************************************************/
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void up_rngaddentropy(enum rnd_source_t kindof, FAR const uint32_t *buf,
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size_t n);
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/****************************************************************************
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* Function: up_rngreseed
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*
|
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* Description:
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* Force reseeding random number generator from entropy pool
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*
|
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****************************************************************************/
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void up_rngreseed(void);
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/****************************************************************************
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* Function: up_randompool_initialize
|
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*
|
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* Description:
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* Initialize entropy pool and random number generator
|
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*
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****************************************************************************/
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void up_randompool_initialize(void);
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#endif /* CONFIG_CRYPTO_RANDOM_POOL */
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#endif /* __INCLUDE_NUTTX_RANDOM_H */
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@@ -93,6 +93,8 @@ FAR void *memcpy(FAR void *dest, FAR const void *src, size_t n);
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FAR void *memmove(FAR void *dest, FAR const void *src, size_t count);
|
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FAR void *memset(FAR void *s, int c, size_t n);
|
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|
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void explicit_bzero(FAR void *s, size_t n);
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|
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#undef EXTERN
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#if defined(__cplusplus)
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}
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@@ -0,0 +1,77 @@
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/****************************************************************************
|
||||
* include/sys/random.h
|
||||
*
|
||||
* Copyright (C) 2015-2017 Haltian Ltd. All rights reserved.
|
||||
* Authors: Juha Niskanen <juha.niskanen@haltian.com>
|
||||
* Jussi Kivilinna <jussi.kivilinna@haltian.com>
|
||||
*
|
||||
* Redistribution and use in source and binary forms, with or without
|
||||
* modification, are permitted provided that the following conditions
|
||||
* are met:
|
||||
*
|
||||
* 1. Redistributions of source code must retain the above copyright
|
||||
* notice, this list of conditions and the following disclaimer.
|
||||
* 2. Redistributions in binary form must reproduce the above copyright
|
||||
* notice, this list of conditions and the following disclaimer in
|
||||
* the documentation and/or other materials provided with the
|
||||
* distribution.
|
||||
* 3. Neither the name NuttX nor the names of its contributors may be
|
||||
* used to endorse or promote products derived from this software
|
||||
* without specific prior written permission.
|
||||
*
|
||||
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
|
||||
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
|
||||
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
|
||||
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
|
||||
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
|
||||
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
|
||||
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
|
||||
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
|
||||
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
||||
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
|
||||
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
|
||||
* POSSIBILITY OF SUCH DAMAGE.
|
||||
*
|
||||
****************************************************************************/
|
||||
|
||||
#ifndef __INCLUDE_SYS_RANDOM_H
|
||||
#define __INCLUDE_SYS_RANDOM_H
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|
||||
/****************************************************************************
|
||||
* Included Files
|
||||
****************************************************************************/
|
||||
|
||||
#include <nuttx/config.h>
|
||||
#include <stddef.h>
|
||||
|
||||
/****************************************************************************
|
||||
* Public Function Prototypes
|
||||
****************************************************************************/
|
||||
|
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#ifdef CONFIG_CRYPTO_RANDOM_POOL
|
||||
|
||||
/****************************************************************************
|
||||
* Function: getrandom
|
||||
*
|
||||
* Description:
|
||||
* Fill a buffer of arbitrary length with randomness. This is the
|
||||
* preferred interface for getting random numbers. The traditional
|
||||
* /dev/random approach is susceptible for things like the attacker
|
||||
* exhausting file descriptors on purpose.
|
||||
*
|
||||
* Note that this function cannot fail, other than by asserting.
|
||||
*
|
||||
* Parameters:
|
||||
* bytes - Buffer for returned random bytes
|
||||
* nbytes - Number of bytes requested.
|
||||
*
|
||||
* Returned Value:
|
||||
* None
|
||||
*
|
||||
****************************************************************************/
|
||||
|
||||
void getrandom(FAR void *bytes, size_t nbytes);
|
||||
|
||||
#endif /* CONFIG_CRYPTO_RANDOM_POOL */
|
||||
|
||||
#endif /* __INCLUDE_SYS_RANDOM_H */
|
||||
+12
-3
@@ -524,10 +524,19 @@
|
||||
/* The following is defined only if CONFIG_TASK_NAME_SIZE > 0 */
|
||||
|
||||
#if CONFIG_TASK_NAME_SIZE > 0
|
||||
# define SYS_prctl (SYS_nnetsocket+0)
|
||||
# define SYS_maxsyscall (SYS_nnetsocket+1)
|
||||
# define SYS_prctl (SYS_nnetsocket+1)
|
||||
#else
|
||||
# define SYS_maxsyscall SYS_nnetsocket
|
||||
# define SYS_prctl SYS_nnetsocket
|
||||
#endif
|
||||
|
||||
/* The following is defined only if entropy pool random number generator
|
||||
* is enabled. */
|
||||
|
||||
#ifdef CONFIG_CRYPTO_RANDOM_POOL
|
||||
# define SYS_getrandom (SYS_prctl+1)
|
||||
# define SYS_maxsyscall (SYS_prctl+2)
|
||||
#else
|
||||
# define SYS_maxsyscall SYS_prctl
|
||||
#endif
|
||||
|
||||
/* Note that the reported number of system calls does *NOT* include the
|
||||
|
||||
Reference in New Issue
Block a user