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f304177726
samr21 has HW aes-128 module. It couldn't be used before as mbedtls uses 256 bit random generator. Recently mbedtls introduces MBEDTLS_CTR_DRBG_USE_128_BIT_KEY flag which makes mbedtls to use 128 bit random generator. It limits the security of generated keys but allows to use HW aes-128 module for encrypt/decrypt 802.15.4 frames. Signed-off-by: Oleksandr Grytsov <al1img@gmail.com>