Hi.
I try to improve test coverage of internal/crypto.

Already I submitted pull requests that I can write test.
#17555, #17458, #17449, #17447, #17426, #17418, #17728 and #17730.

I found two coverage blockers.

1. process.binding('crypto').PBKDF2 does not returns -1

Code

Reason

PBKDF2 returns undefined always because PBKDF2 returns anything.
See also:

So never match returns -1.

2. Can't throw ERR_CRYPTO_HASH_UPDATE_FAILED

Code

Reason

Hash#_handle.update does not throw an Error(ERR_CRYPTO_HASH_UPDATE_FAILED).

Hash#_handle.update returns false when mdctx_ pointed at null.
But I could not reproduce mdctx_ make the null pointer.

See also:

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1: I think should remove check where PBKDF2 returns -1.
2: Please teach me how to make mdctx_ to the null pointer.