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42 lines
1.5 KiB
42 lines
1.5 KiB
/******************************************************************************
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*
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* Copyright 2017 Xaptum, Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License
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*
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*****************************************************************************/
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#include "rand_pool.h"
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void ecdaa_rand_pool_init(struct ecdaa_rand_pool *pool,
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size_t requested_size,
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void (*get_random)(void *buf, size_t buflen))
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{
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// Fill our pool with randomness (will be replenished if needed)
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pool->size = requested_size>sizeof(pool->pool) ? sizeof(pool->pool) : requested_size;
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get_random(pool->pool, pool->size);
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pool->pool_ptr = pool->pool;
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pool->get_random = get_random;
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}
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uint8_t get_random_byte(struct ecdaa_rand_pool *pool)
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{
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if (pool->pool_ptr >= (pool->pool + pool->size)) {
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pool->get_random(pool->pool, pool->size);
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pool->pool_ptr = pool->pool;
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}
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pool->pool_ptr += 1;
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return *(pool->pool_ptr - 1);
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}
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