This tutorial will guide you on how to hash a string by using OpenSSL’s SHA1 hash function. This tutorial will create two C++ example files which will compile and run in Ubuntu environment.

  1. Here are the openssl SHA1 sample source code.

    Example #1: sha1_sample1.cpp


    Example #2: sha1_sample2.cpp

  2. Let’s try to compile both sample cpp files and you should observe the following output screenshot.
    ~$ gcc sha1_sample1.cpp -o sample1 -lcrypto
    ~$ ./sample1
    SHA1 digest: 2aae6c35c94fcfb415dbe95f408b9ce91ee846ed
    ~$ gcc sha1_sample2.cpp -o sample2 -lcrypto
    ~$ ./sample2
    SHA1 digest: 2aae6c35c94fcfb415dbe95f408b9ce91ee846ed
    Note: -lcrypto will include the crypto library from openssl