Add crypto_sign_sk2pk (PR #668)

This should allow users to convert a ed25519 seret key to a public key without rolling their own code

1 files changed, 7 insertions, 0 deletions

diff --git a/validat4.cpp b/validat4.cpp
index cf7ef70b..71b791e0 100644
--- a/validat4.cpp
+++ b/validat4.cpp
@@ -455,6 +455,13 @@ bool TestCryptoSignKeys()
     {

         fail = (crypto_sign_keypair(pk, sk) != 0);

         pass = !fail && pass;

+        

+        byte xk[crypto_sign_PUBLICKEYBYTES];

+        fail = (crypto_sign_sk2pk(xk, sk) != 0);

+        pass = !fail && pass;

+        

+        fail = std::memcmp(xk, pk, sizeof(xk)) != 0;

+        pass = !fail && pass;

 

         const word32 len = (i == 0 ? 0 : GlobalRNG().GenerateWord32(1, MAX_MESSAGE));

         SecByteBlock m(len), sm(len+crypto_sign_BYTES), rm(len+crypto_sign_BYTES);