CODEWITHSUNDEEP
c++opensslrsa
Wesley Jones
Wesley Jones

Reputation: 73

How to generate and hex encode a ED25519 keypair using openssl 3.0 c++

So far I can do the following. But I have no idea if it is working because I can't see the keys. I am planning on extracting them into a char array and storing them In a struct. So I need the full encoded byte array for the private and public keys.

I think I have it working partially for RSA. But I can't figure out how to use ED22519.

static bool GenerateEncryptionKeys(ofstream *file)
        {
            EVP_PKEY_CTX *ctx;
            EVP_PKEY *pkey = NULL;

            ctx = EVP_PKEY_CTX_new_id(EVP_PKEY_RSA, NULL);
            if (ctx)
            {
                if (EVP_PKEY_keygen_init(ctx) > 0)
                {
                    if (EVP_PKEY_CTX_set_rsa_keygen_bits(ctx, 2048) > 0)
                    {
                        if (EVP_PKEY_keygen(ctx, &pkey) > 0)
                        {
                            print("All good");
                        }
                    }
                }
            }
return.

Upvotes: 1

Views: 1011

Answers (1)

Wesley Jones
Wesley Jones

Reputation: 73

Nevermind. I solved it.

static bool GenerateEncryptionKeys()
        {
            EVP_PKEY *my_pkey = nullptr;
            EVP_PKEY_CTX *my_ctx = EVP_PKEY_CTX_new_id(EVP_PKEY_ED25519, nullptr);
            EVP_PKEY_keygen_init(my_ctx);
            EVP_PKEY_keygen(my_ctx, &my_pkey);

            std::size_t pub_key_allocated_length;
            EVP_PKEY_get_raw_public_key(my_pkey, NULL, &pub_key_allocated_length);

            unsigned char *public_key = new unsigned char[pub_key_allocated_length];
            EVP_PKEY_get_raw_public_key(my_pkey, public_key, &pub_key_allocated_length);

            std::size_t pkey_allocated_length;
            EVP_PKEY_get_raw_private_key(my_pkey, NULL, &pkey_allocated_length);

            unsigned char *private_key = new unsigned char[pkey_allocated_length];
            EVP_PKEY_get_raw_private_key(my_pkey, private_key, &pkey_allocated_length);
            WriteEncryptionKeys(convertToString((const char *)private_key, pkey_allocated_length), convertToString((const char *)public_key, pub_key_allocated_length));
            return true;
        }

Upvotes: 1

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