Pass with append string still valid

[weierophinney]

Adding string to correct basic token still allow to pass token when using crypt.

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Originally posted by @snapshotpl at zendframework/zend-authentication#43

[weierophinney]

What you show here apears to be result of non-strict mode of base64_decode() in Http adapter, which silently drops invalid portions of base64 encoded string

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Originally posted by @Xerkus at zendframework/zend-authentication#43 (comment)