Openssl Rsa Generate Key Pair
RSAgeneratekey generates a key pair and returns it in a newly allocated RSA structure. The pseudo-random number generator must be seeded prior to calling RSAgeneratekey. The modulus size will be num bits, and the public exponent will be e. Key sizes with num. May 29, 2016 RSA is a cryptosystem for public-key encryption widely used for securing sensitive data particularly when sent over the internet. To generate a key pair for RSA, there are many open source tools that you can use. These tools are: Gpg4Win for windows, GPGTools for Mac and GNUPG which can be used across platforms.
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Openssl Rsa Generate Key Pair List
Openssl Rsa Generate Key Pair List
If you're using openssl_pkey_new() in conjunction with openssl_csr_new() and want to change the CSR digest algorithm as well as specify a custom key size, the configuration override should be defined once and sent to both functions:
<?php
$config = array(
'digest_alg' => 'sha1',
'private_key_bits' => 2048,
'private_key_type' => OPENSSL_KEYTYPE_RSA,
);
$privkey = openssl_pkey_new($config);
$csr = openssl_csr_new($dn, $privkey, $config);
?>
Although openssl_pkey_new() will accept the 'digest_alg' argument it won't use it, and setting the value has no effect unless you also set this value for openssl_csr_new(). The reason for this is that the $config array is acting as a drop-in replacement for the values found in the openssl.cnf file, so it must contain all of the override values that you need even if the function they're being sent to won't use them.
Also, if you change the 'digest_alg' to something like 'sha256' and still get an MD5 signed CSR check your openssl.cnf file to see whether the digest algorithm you want to use is actually supported.