Surprising that no answer suggests the simple openssl passwd command with the -6 option. To decrypt it (notice the addition of the -d flag that triggers a decrypt instead of an encrypt action): openssl aes-128-cbc -d -in Archive.zip.aes128 -out Archive.zip. If you don't care providing the password on the command-line (risking it staying in the command history), then you can do: openssl passwd -6 YourPassword It will generate the salt, and output a line like this: On Linux, /dev/urandom is a non-blocking pseudo-random number generator (PRNG). Method: Security Level: Performance: Notes: Password hash and verify: Medium to high. The following commands are relevant when you work with RSA keys: openssl genrsa: Generates an RSA private keys. The openssl passwd --help command only mentions MD5. The easiest (and recommended) way to add a user with a password to the system is to add the user with the useradd -m user command, and then set the user’s password with passwd. Of course, there are other ways to generate strings of random data. openssl version "OpenSSL 1.1.1” on Linux and openssl version "LibreSSL 2.6.5” on MacOS support md5_crypt. We encrypt the large file with the small password file as password. encryption with passwd. One note on the OpenSSL base64 command: the number you enter is the number of random bytes that OpenSSL will generate, *before* base64 encoding. Base64 then then produces four bytes of output for every three bytes of input – meaning that the number on the command line should be 3/4 of the desired password length. Depending on the algorithm. This one reads from a special device file. Maybe it wasn't available yet in 2011? openssl aes-128-cbc -in Archive.zip -out Archive.zip.aes128. I want to supply the password using some encrypted format or any other way such that its not easily readable . But speed is not everything, there are other considerations. I'm using openssl to sign files, it works but I would like the private key file is encrypted with a password. These are the commands I'm using, I would like to know the equivalent commands using a password:----- EDITED -----I put here the updated commands with password: This encryption is done by the crypt function. This example uses the Advanced Encryption … Passwords are stored in an encrypted format. Conclusion, openssl_encrypt() 128-bit AES is blazing fast and password_hash() using BCRYPT is freaking slow. Slow. openssl rsa -aes256 -in your.key -out your.encrypted.key mv your.encrypted.key your.key chmod 600 your.key the -aes256 tells openssl to encrypt the key with AES256. Currently, I am supplying the password in plaintext format as below: openssl genrsa -aes128 -passout pass:foobar 3072 Where foobar is the password supplied in plaintext format .. How can I generate a hashed password for /etc/shadow? Using the method detailed in this Red Hat Magazine article works great to generate /etc/shadow-compatible md5-hashed passwords, but what about SHA-256 or SHA-512? If the -salt option is not used, the "openssl passwd" command will choose the salt value randomly, so the encryption result will be different each time: $ openssl passwd -crypt ABcd@123 S3oA559In3qHE $ openssl passwd -crypt ABcd@123 4e.6PnvMJGuHo $ openssl passwd -crypt ABcd@123 7S/umCxP4JdhM Then we send the encrypted file and the encrypted key to the other party and then can decrypt the key with their public key, the use that key to decrypt the large file. Need to hash a passphrase like crypt() does, with SHA512. 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