crypto/cipher/ctr: ctr-aes support offset

[izouxv]

This feature allow ctr-aes support parallel XORKeyStream

[gopherbot]

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[gopherbot]

This PR (HEAD: 25c9f29) has been imported to Gerrit for code review.

Please visit https://go-review.googlesource.com/c/go/+/479435 to see it.

Tip: You can toggle comments from me using the comments slash command (e.g. /comments off)
See the Wiki page for more info

[gopherbot]

Message from xu zou:

Patch Set 3: Code-Review+1

(1 comment)

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[gopherbot]

Message from Ian Lance Taylor:

Patch Set 3: Hold+1

(1 comment)

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