Add an example taken from the tutorial

1 files changed, 55 insertions, 0 deletions

diff --git a/doc/examples/encrypt2.cpp b/doc/examples/encrypt2.cpp
new file mode 100644
index 000000000..3d91a9bc5
--- /dev/null
+++ b/doc/examples/encrypt2.cpp
@@ -0,0 +1,55 @@
+#include <botan/botan.h>
+#include <botan/pbkdf2.h>
+#include <botan/hmac.h>
+#include <botan/sha160.h>
+
+#include <fstream>
+
+using namespace Botan;
+
+int main()
+   {
+   LibraryInitializer init;
+
+   AutoSeeded_RNG rng;
+
+   std::string passphrase = "secret";
+
+   std::ifstream infile("readme.txt");
+   std::ofstream outfile("readme.txt.enc");
+
+   PKCS5_PBKDF2 pbkdf2(new HMAC(new SHA_160));
+
+   pbkdf2.set_iterations(4096);
+   pbkdf2.new_random_salt(rng, 8);
+   SecureVector<byte> the_salt = pbkdf2.current_salt();
+
+   SecureVector<byte> master_key = pbkdf2.derive_key(48, passphrase).bits_of();
+
+   KDF* kdf = get_kdf("KDF2(SHA-1)");
+
+   SymmetricKey key = kdf->derive_key(20, master_key, "cipher key");
+   SymmetricKey mac_key = kdf->derive_key(20, master_key, "hmac key");
+   InitializationVector iv = kdf->derive_key(8, master_key, "cipher iv");
+
+   Pipe pipe(new Fork(
+                new Chain(
+                   get_cipher("Blowfish/CBC/PKCS7", key, iv, ENCRYPTION),
+                   new Base64_Encoder,
+                   new DataSink_Stream(outfile)
+                   ),
+                new Chain(
+                   new MAC_Filter("HMAC(SHA-1)", mac_key),
+                   new Hex_Encoder)
+                )
+      );
+
+   outfile.write((const char*)the_salt.begin(), the_salt.size());
+
+   pipe.start_msg();
+   infile >> pipe;
+   pipe.end_msg();
+
+   SecureVector<byte> hmac = pipe.read_all(1);
+   outfile.write((const char*)hmac.begin(), hmac.size());
+   }