use new ssl/tls openssh toolkit

Fixes #647

src/SIGN/Hasher.cpp

 #include "Hasher.h"
-#include <openssl/sha.h>
+#include <openssl/evp.h>
 #include <sstream>
 #include <iomanip>
 
 
-
 std::vector<unsigned char> SIGN::Hasher::sha256(const unsigned char* data, size_t length)
 {
-	SHA256_CTX context;
-	SHA256_Init(&context);
-	SHA256_Update(&context, data, length);
-	std::vector<unsigned char> buffer(SHA256_DIGEST_LENGTH);
-	SHA256_Final(buffer.data(), &context);
+	EVP_MD_CTX* context = EVP_MD_CTX_new();
+	EVP_DigestInit_ex(context, EVP_sha256(), NULL);
+	EVP_DigestUpdate(context, data, length);
+	std::vector<unsigned char> buffer(EVP_MD_size(EVP_sha256()));
+	EVP_DigestFinal_ex(context, buffer.data(), NULL);
+	EVP_MD_CTX_free(context);
 	return buffer;
-
 }
 
 SIGN::Hasher::Hasher()
@@ -37,7 +36,7 @@ void SIGN::Hasher::reset()
 
 size_t SIGN::Hasher::size(void)
 {
-	return SHA256_DIGEST_LENGTH; ;
+	return EVP_MD_size(EVP_sha256());
 }
 
 std::string SIGN::Hasher::print(std::vector<unsigned char> bytes, bool uppercase)