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sys/random: provide generic random_bytes()
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@ -1,4 +1,4 @@
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SRC := seed.c
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SRC := random.c
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BASE_MODULE := prng
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SUBMODULES := 1
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@ -39,3 +39,18 @@ void auto_init_random(void)
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DEBUG("random: using seed value %u\n", (unsigned)seed);
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random_init(seed);
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}
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void random_bytes(uint8_t *target, size_t n)
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{
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uint32_t random;
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uint8_t *random_pos = (uint8_t*)&random;
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unsigned _n = 0;
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while (n--) {
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if (! (_n++ & 0x3)) {
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random = random_uint32();
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random_pos = (uint8_t *) &random;
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}
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*target++ = *random_pos++;
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}
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}
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@ -44,36 +44,6 @@ uint32_t random_uint32(void)
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return tinymt32_generate_uint32(&_random);
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}
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void random_bytes(uint8_t *buf, size_t size)
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{
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size_t iter = size;
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size_t diff = _align(buf) - buf;
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uint32_t tmp;
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/* Fill first <4 unaligned bytes */
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if (diff) {
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tmp = tinymt32_generate_uint32(&_random);
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if (diff > size) {
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diff = size;
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}
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memcpy(buf, &tmp, diff);
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iter -= diff;
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}
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/* Fill aligned bytes */
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while (iter >= sizeof(uint32_t)) {
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*((uint32_t *) buf) = tinymt32_generate_uint32(&_random);
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buf += sizeof(uint32_t);
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iter -= sizeof(uint32_t);
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}
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/* Fill last bytes */
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if (iter) {
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tmp = tinymt32_generate_uint32(&_random);
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memcpy(buf, &tmp, iter);
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}
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}
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void random_init_by_array(uint32_t init_key[], int key_length)
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{
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tinymt32_init_by_array(&_random, init_key, key_length);
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