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AES encryption / decryption

Online AES encryption/decryption tool. AES uses a symmetric packet password system with a key length support of 128/192/256 bits. When the user key is not long enough, the tool will be populated with 0x00. The same is true of IV. The out-of-the-place will be ignored. When encrypted, clear text data is grouped in 16bytes, and less than 16bytes will be filled with specific Padding (such as PCKS7) characters, so the last paragraph of the text in different Padding mode may be different. If there is no specific indication that this tool will use UTF8 encoding to process data (e.g. KEY/IV). This tool is not fully tested, please give feedback if a problem is found.