Behaves identical to the legacy counterpart rsa_generate_keypair_mem() except that it allows the caller to specify the cipher used to encrypt the private key (the legacy function always uses des-ede3-cbc).
This function generates an RSA keypair, storing the public and private components in files in the variables specified. The public key is encoded using a PKCS#1 RSAPublicKey structure. The private key is encrypted with the specified cipher using the provided passphrase and stored in in PKCS#8 EncryptedPrivateKeyInfo format using PKCS#5 v2.0 password based encryption algorithms. Note that OpenSSL only permits a subset of its supported ciphers to be used for RSA key encryption. For example, only CBC mode ciphers are permitted.
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