How to load RSA public and private key from memory

Question

I need to hard code my RSA private/public key in my app, the key is actually a file in PEM format, how can I load it from memory by calling OpenSSL routines?

Answer 1

You need to use OpenSSL's BIO functions to allow reading from a memory location:

BIO *key_bio;
RSA *key;
char private_key_data[] = // your private key

key_bio = BIO_new_mem_buf(private_key_data, -1);
key = PEM_read_bio_RSAPrivateKey(key_bio, NULL, NULL, NULL);

Run man 3 bio, man 3 BIO_new_mem_buf, and man 3 pem for more details.

Answer 2

Try EVP_PKEY *PEM_read_PrivateKey(FILE *fp, EVP_PKEY **x, pem_password_cb *cb, void *u);