CRYPTO_BUFFER_SIZE
uint8_t ibuf[CRYPTO_BUFFER_SIZE];
uint8_t obuf[CRYPTO_BUFFER_SIZE];
if (sz > CRYPTO_BUFFER_SIZE)
r = fread(ibuf, 1, CRYPTO_BUFFER_SIZE, in);
uint8_t ibuf[CRYPTO_BUFFER_SIZE];
uint8_t obuf[CRYPTO_BUFFER_SIZE];
while ((r = fread(ibuf, 1, CRYPTO_BUFFER_SIZE, in)) != 0) {