![]() Note that other ciphers are also supported, including aria, camellia, des, des3, and idea.Ĭompletion of running the above command will result in an aes256 key generated by openssl genrsa. With this cipher, AES CBC 256 encryption is the type of encryption. Where -out key.pem is the file containing the AES encrypted private key, and -aes256 is the chosen cipher. openssl genrsa password example openssl genrsa -out key.pem -aes256 Completion of running this command will result in a 4096 key generated by openssl genrsa. ![]() Where -out key.pem is the file containing the plain text private key, and 4096 is the numbits or keysize in bits. openssl genrsa 4096 example without passphrase openssl genrsa -out key.pem 4096 Completion of running this command will result in a 2048 key generated by openssl genrsa. Where -out key.pem is the file containing the plain text private key, and 2048 is the numbits or keysize in bits. openssl genrsa 2048 example without passphrase openssl genrsa -out key.pem 2048 For more information, read our post on openssl genpkey. While the genrsa command is still valid and in use today, it is recommended to start using genpkey. The openssl genpkey utility has superseded the genrsa utility. * represents that the current prime starts regenerating progress due to failed tests.Ī newline represents the number has passed all the prime tests. + represents a number that has passed a round of the Miller-Rabin primality test represents each number which has passed an initial sieve test During generation the following symbols will be outputted demonstrating the progress of key generation: ![]() Prime numbers are used in generating the RSA private key. ![]() The generated RSA private key can be customized by specifying the cipher algorithm and key size. Use the openssl genrsa command to generate an RSA private key. ![]()
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