Add header file

CryptEpstein.h

@@ -0,0 +1,19 @@
+#pragma once
+#include <cstdio>
+#include <fstream>
+#include <iostream>
+#include <memory>
+#include <stdexcept>
+#include <string>
+#include <vector>
+
+#include <openssl/evp.h>
+#include <openssl/pem.h>
+#include <openssl/rand.h>
+#include <openssl/rsa.h>
+
+// RAII
+struct PKEYDeleter { void operator()(EVP_PKEY* p) const { EVP_PKEY_free(p); } };
+struct CTXDeleter { void operator()(EVP_PKEY_CTX* p) const { EVP_PKEY_CTX_free(p); } };
+struct CipherDeleter { void operator()(EVP_CIPHER_CTX* ctx) const { EVP_CIPHER_CTX_free(ctx); } };
+struct BIODeleter { void operator()(BIO* b) const { BIO_free_all(b); } };