If the file was encrypted using
PBE (Password-Based Encryption) where the encryption key is derived from a password or other human-formatted input, you can use the EncryptContent processor in NiFi to decrypt the contents. Use a GetFile processor to read the file contents, and connect this to an EncryptContent processor set to Decrypt and populate the password and encryption algorithm as PBEWITHMD5ANDDES or PBEWITHSHA1ANDDES depending on which hash function was used to determine the key.
If you did not use PBE and have only the raw key, you will not be able to use
EncryptContent for this. My recommendation would be to write a simple Groovy script to perform the decryption and use the ExecuteScript processor, or use ExecuteStreamCommand and call openssl on the command-line to perform the decryption there.
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