Openssl Aes Key Generation C++

This might be a noob question, but I couldn't find its answer anywhere online: why does an OpenSSL generated 256-bit AES key have 64 characters? The command I'm using to generate the key is: $ ope. The EVP functions support the ability to generate parameters and keys if required for EVPPKEY objects. Since these functions use random numbers you should ensure that the random number generator is appropriately seeded as discussed here.

Openssl Aes Key Generation
C++ Openssl Aes

Asymmetric Encryption and Decryption
Documentation
`#include <openssl/evp.h>`

Encryption and decryption with asymmetric keys is computationally expensive. Typically then messages are not encrypted directly with such keys but are instead encrypted using a symmetric 'session' key. This key is itself then encrypted using the public key. In OpenSSL this combination is referred to as an envelope. It is also possible to encrypt the session key with multiple public keys. This way the message can be sent to a number of different recipients (one for each public key used). The session key is the same for each recipient.

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The OpenSSL manual pages for dealing with envelopes can be found here: Manual:EVP_SealInit(3) and Manual:EVP_OpenInit(3)

Sealing an Envelope[edit]

An envelope is sealed using the EVP_Seal* set of functions, and an operation consists of the following steps:

Initialise the context
Initialise the seal operation, providing the symmetric cipher that will be used, along with the set of public keys to encrypt the session key with
Provide the message to be encrypted.
Complete the encryption operation

This can be seen in the following example code:

Opening and Envelope[edit]