Re: [openssl-users] Convert RSA key string to PEM file.

[Ken Goldman]

On 1/1/2016 4:29 AM, Sugumar wrote:

Hi,

I have a RSA Public key as string type.
I need to convert this string to PEM file. Please help me to create PEM file
from string type.

Convert the string to a binary array.
Convert the array n and e to bignum
        *bn = BN_bin2bn(bin, bytes, *bn);

Create an RSA structure and assign n and e to the bignums
        rsa_pub_key = RSA_new();
        (rsa_pub_key)->n = n;
        (rsa_pub_key)->e = e;
        (rsa_pub_key)->d = NULL;

        RSA *rsa_pub_key
        EVP_PKEY        *pkey = NULL;
        pkey = EVP_PKEY_new();
        irc  = EVP_PKEY_assign_RSA(pkey, rsa_pub_key);
        pemFile = fopen(pemFilename, "wb");
        irc = PEM_write_PUBKEY(pemFile, pkey);
        fclose(pemFile);



_______________________________________________
openssl-users mailing list
To unsubscribe: https://mta.openssl.org/mailman/listinfo/openssl-users