Generate and check ECDSA signature in example

1 files changed, 29 insertions, 2 deletions

diff --git a/doc/examples/ecdsa.cpp b/doc/examples/ecdsa.cpp
index bd40e897b..db4a94f3f 100644
--- a/doc/examples/ecdsa.cpp
+++ b/doc/examples/ecdsa.cpp
@@ -1,5 +1,7 @@
 #include <botan/botan.h>
 #include <botan/ecdsa.h>
+#include <botan/pubkey.h>
+#include <botan/look_pk.h>
 
 #include <memory>
 #include <iostream>
@@ -15,12 +17,37 @@ int main()
 
       EC_Domain_Params params = get_EC_Dom_Pars_by_oid("1.3.132.0.8");
 
+      ECDSA_PrivateKey ecdsa(*rng, params);
+
+      ECDSA_PublicKey ecdsa_pub = ecdsa;
+
+      /*
       std::cout << params.get_curve().get_p() << "\n";
       std::cout << params.get_order() << "\n";
+      std::cout << X509::PEM_encode(ecdsa);
+      std::cout << PKCS8::PEM_encode(ecdsa);
+      */
 
-      ECDSA_PrivateKey ecdsa(*rng, params);
+      std::auto_ptr<PK_Signer> signer(get_pk_signer(ecdsa, "EMSA1(SHA-256)"));
 
-      std::cout << X509::PEM_encode(ecdsa);
+      const char* message = "Hello World";
+
+      signer->update((const byte*)message, strlen(message));
+
+      SecureVector<byte> sig = signer->signature(*rng);
+
+      std::cout << sig.size() << "\n";
+
+      std::auto_ptr<PK_Verifier> verifier(
+         get_pk_verifier(ecdsa_pub, "EMSA1(SHA-256)"));
+
+      verifier->update((const byte*)message, strlen(message));
+
+      bool ok = verifier->check_signature(sig);
+      if(ok)
+         std::cout << "Signature valid\n";
+      else
+         std::cout << "Bad signature\n";
       }
    catch(std::exception& e)
       {