lcx_rng.h

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/*******************************************************************************
 *   Ledger Nano S - Secure firmware
 *   (c) 2022 Ledger
 *
 *  Licensed under the Apache License, Version 2.0 (the "License");
 *  you may not use this file except in compliance with the License.
 *  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 ********************************************************************************/
 
#ifndef LCX_RNG_H
#define LCX_RNG_H
 
#ifdef HAVE_RNG
 
#include "lcx_wrappers.h"
#include "lcx_hash.h"
 
void cx_rng_no_throw(uint8_t *buffer, size_t len);
 
static inline unsigned char *cx_rng(uint8_t *buffer, size_t len)
{
    cx_rng_no_throw(buffer, len);
    return buffer;
}
 
static inline uint32_t cx_rng_u32(void)
{
    uint32_t r;
    cx_rng_no_throw((uint8_t *) &r, sizeof(uint32_t));
    return r;
}
 
static inline uint8_t cx_rng_u8(void)
{
    uint8_t r;
    cx_rng_no_throw((uint8_t *) &r, sizeof(uint8_t));
    return r;
}
 
typedef uint32_t (*cx_rng_u32_range_randfunc_t)(void);
 
uint32_t cx_rng_u32_range_func(uint32_t a, uint32_t b, cx_rng_u32_range_randfunc_t randfunc);
 
static inline uint32_t cx_rng_u32_range(uint32_t a, uint32_t b)
{
    return cx_rng_u32_range_func(a, b, cx_rng_u32);
}
 
WARN_UNUSED_RESULT cx_err_t cx_rng_rfc6979(cx_md_t        hash_id,
                                           const uint8_t *x,
                                           size_t         x_len,
                                           const uint8_t *h1,
                                           size_t         h1_len,
                                           const uint8_t *q,
                                           size_t         q_len,
                                           uint8_t       *out,
                                           size_t         out_len);
 
#endif  // HAVE_RNG
 
#endif  // LCX_RNG_H