Encrypt data with using public key file in C language

Question

I need to pass the data to the server2.c through another server1.c in the middle. Before calling SSL_write() I want to encrypt my data using public key file pubkey.pem of the server2.c so the server1.c cannot understand the data and simply writes it to the server2.c

What system call I should use that takes data and public key file as arguments?

jww · Accepted Answer · 2015-05-14 06:09:08Z

1

What system call I should use that takes data and public key file as arguments?

In the C language with OpenSSL, there are no arguments like in a program with argc and argv. There are functions and parameters.

In OpenSSL, you use the EVP functions to do it. In particular, EVP_Seal to encrypt and EVP_Open to decrypt using public key cryptography. See the EVP(3) man pages for more details. Or see OpenSSL's EVP Wiki page for details.

There are EVP_encrypt and EVP_Decrypt functions, but they are used for symmetric key encryption, and not public key encryption.

answered May 14, 2015 at 6:09

jww

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