blake2: reject a digest size below 1#166
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Make_BLAKE2 only checked the upper bound on digest_size, so a size below 1 (e.g. -1) was accepted; in the C backend it wraps to a uint8_t (255) and finalise writes past the caller's destination buffer. Reject digest_size < 1 as well, in both the C and pure-OCaml backends.
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Make_BLAKE2only checks the upper bound ondigest_size, so a size below 1 (e.g.-1) is accepted; in the C backend it wraps to auint8_t(255) andfinalisewrites past the caller's destination buffer. Rejectdigest_size < 1as well, in both the C and pure-OCaml backends.