Add optional buffer argument to Cipher#final #990
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This adds an optional buffer argument to the Cipher#final method, matching the behavior of Cipher#update. When a buffer is provided, the output is written to it and the same buffer object is returned. Otherwise, a new string is created and returned. The implementation follows the same pattern as update: - Accepts an optional string buffer parameter - Reuses the buffer if provided, creating a new string if not - Automatically resizes the buffer as needed - Forces ASCII-8BIT encoding for binary cipher output - Raises FrozenError if the buffer is frozen
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This adds an optional buffer argument to the Cipher#final method, matching the behavior of Cipher#update. When a buffer is provided, the output is written to it and the same buffer object is returned. Otherwise, a new string is created and returned.
The implementation follows the same pattern as update: