OpenSSL/Cheatsheet

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Command line shortcuts

Type Action Command Comment
Base64 Encode openssl base64 -in <INPUT>.txt -out <OUTPUT>.b64
Base64 Decode openssl base64 -d -in <INPUT>.b64 -out <OUTPUT>.txt
MD5 Checksum openssl md5 <INPUT> Same as md5sum <INPUT>
SHA1 Checksum openssl sha1 <INPUT> Same as sha1sum <INPUT>
SHA224 Checksum openssl sha224 <INPUT> Same as sha224sum <INPUT>
SHA256 Checksum openssl sha256 <INPUT> Same as sha256sum <INPUT>
SHA384 Checksum openssl sha384 <INPUT> Same as sha384sum <INPUT>
SHA512 Checksum openssl sha512 <INPUT> Same as sha512sum <INPUT>

MD5

Checksum a file

openssl md5 file

SHA1

Checksum a file

openssl sha1 file


Generate Passwords

Crypt

openssl passwd <Password>

MD5 (for /etc/passwd and /etc/shadow)

openssl passwd -1 <Password>

Note: Newer versions of Debian use the sha-512 there is a tool called mkpasswd that will create compatible passwords.

File encryption

Encrypt

openssl enc -aes-256-cbc < <File> > <File>.aes
enter aes-256-cbc encryption password:
Verifying - enter aes-256-cbc encryption password:

Decrypt

openssl enc -d -aes-256-cbc -in <File>.aes > <File> 
enter aes-256-cbc decryption password: