fix(block-ciphers): cbc: use array offsets

[nkeor]

For example, if decrypting a Uint8Array created with an offset, decrypt() would skip that offset and read the entire underlying buffer, even if not all data is encrypted.

I'm unsure whether this means a breaking change.

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[aykxt]

Hi, thanks for the contribution! Would you mind adding the array offsets to other block modes as well?

[nkeor]

The only other one I found was in cfb's encrypt().

All the others use data.slice(), which already uses the correct offsets. The issue is when creating a new DataView from the underlying data.buffer