OpenSSL manual

This book is a short and detailed manual on OpenSSL with the focus on the API and programming interfaces with many examples in C / C++.

Author: Devendra Naga ([email protected])

Introduction

This is a short and detailed manual that describe on how to use openssl API programmatically in C / C++.

initialization

OpenSSL library needs to be initialised first before any APIs can be used.

To initialise the OpenSSL library, for cryptographic functions, do the following.

ERR_load_crypto_strings();

OpenSSL_add_all_algorithms();

OPENSSL_config(NULL);

RAND_poll();

To include the openssl libraries, compile with -lssl and -lcrypto.

for example,

g++ aes.c -lcrypto -lssl