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When the salt is being used the first eight bytes of the encrypted data are reserved for the salt: it is generated at random when encrypting a file and read from the encrypted file when it is decrypted.
Note: If I use the same code, but change the output name, it can decrypt just fine. My issue was that I encrypted the file using the same output name as the input, which has made it impossible for me to decrypt it.
Hi,I used to deploy encrypted bash programs to production using openssl.I suggest looking at -openssl-to-encrypt-messages-and-files-on-linuxOr,If your program is compiled code, then why not encrypt secret in a file (manually) then decrypt it in your code into a variable? Then, you can programmatically use it as input to your authentication process.Hope this helps.
The iteration count is for the PBKDF2 hashing algorithm that is designed to make password cracking much much harder. Using a low iteration count like 29 is not very useful. The count should be made as large as you can without it becoming too annoying (1 to 2 seconds of iteration). The current default of 10000 is var too low, even when it was released! 500000 or higher is better.
OpenSSL uses a salted key derivation algorithm. The salt is a piece of random bytes generated when encrypting, stored in the file header; upon decryption, the salt is retrieved from the header, and the key and IV are re-computed from the provided password and salt.
If you run this command several times, you will notice each invocation returns different values ! That's because, in the absence of the -d flag, openssl enc does encryption and generates a random salt each time. Since the salt varies, so do the key and IV. Thus, the -P flag is not very useful when encrypting; the -p flag, however, can be used. Let's try again; this time, we have the file foo_clear which we want to encrypt into foo_enc. Let's run this:
Alternatively, you can specify the salt value with the -S flag, or de-activate the salt altogether with -nosalt. Unsalted encryption is not recommended at all because it may allow speeding up password cracking with pre-computed tables (the same password always yields the same key and IV). If you provide the salt value, then you become responsible for generating proper salts, i.e. trying to make them as unique as possible (in practice, you have to produce them randomly). It is preferable to let openssl handle that, since there is ample room for silent failures ("silent" meaning "weak and crackable, but the code still works so you do not detect the problem during your tests").
This is quite weak! Anybody who knows how to write code on a PC can try to crack such a scheme and will be able to "try" several dozens of millions of potential passwords per second (hundreds of millions will be achievable with a GPU). If you use openssl enc, make sure your password has very high entropy! (i.e. higher than usually recommended; aim for 80 bits, at least). Or, preferably, don't use it at all; instead, go for something more robust (GnuPG, when doing symmetric encryption for a password, uses a stronger KDF with many iterations of the underlying hash function).