various updates

include/fc/crypto/aes.hpp

@@ -1,8 +1,26 @@
 #pragma once
 #include <fc/crypto/sha512.hpp>
+#include <fc/crypto/sha256.hpp>
+#include <fc/uint128.hpp>
+#include <fc/fwd.hpp>
 #include <vector>
 
 namespace fc {
+
+    class aes_encoder
+    {
+       public:
+         aes_encoder( const fc::sha256& key, const fc::uint128& init_value );
+         ~aes_encoder();
+     
+         uint32_t encode( const char* plaintxt, uint32_t len, const char* ciphertxt );
+         uint32_t final_encode( const char* ciphertxt );
+
+       private:
+         struct      impl;
+         fc::fwd<impl,96> my;
+    };
+
     int aes_encrypt(unsigned char *plaintext, int plaintext_len, unsigned char *key,
                     unsigned char *iv, unsigned char *ciphertext);
 

include/fc/crypto/openssl.hpp

@@ -33,10 +33,11 @@ namespace fc
     #define SSL_TYPE(name, ssl_type, free_func) \
         struct name  : public ssl_wrapper<ssl_type> \
         { \
-            name(ssl_type* obj) \
+            name(ssl_type* obj=nullptr) \
               : ssl_wrapper(obj) {} \
             ~name() \
             { \
+                if( obj != nullptr ) \
                 free_func(obj); \
             } \
         };

src/crypto/aes.cpp

@@ -1,11 +1,72 @@
-#include <fc/crypto/sha512.hpp>
+#include <fc/crypto/aes.hpp>
 #include <fc/crypto/openssl.hpp>
 #include <fc/exception/exception.hpp>
+#include <fc/fwd_impl.hpp>
 
 namespace fc {
 
 static int init = init_openssl();
 
+struct aes_encoder::impl 
+{
+   evp_cipher_ctx ctx;
+};
+
+aes_encoder::aes_encoder( const fc::sha256& key, const fc::uint128& init_value )
+{
+    my->ctx.obj = EVP_CIPHER_CTX_new();
+    /* Create and initialise the context */
+    if(!my->ctx)
+    {
+        FC_THROW_EXCEPTION( exception, "error allocating evp cipher context", 
+                           ("s", ERR_error_string( ERR_get_error(), nullptr) ) );
+    }
+
+    /* Initialise the encryption operation. IMPORTANT - ensure you use a key
+    *    and IV size appropriate for your cipher
+    *    In this example we are using 256 bit AES (i.e. a 256 bit key). The
+    *    IV size for *most* modes is the same as the block size. For AES this
+    *    is 128 bits */
+    if(1 != EVP_EncryptInit_ex(my->ctx, EVP_aes_256_cbc(), NULL, (unsigned char*)&key, (unsigned char*)&init_value))
+    {
+        FC_THROW_EXCEPTION( exception, "error durring aes 256 cbc encryption init", 
+                           ("s", ERR_error_string( ERR_get_error(), nullptr) ) );
+    }
+}
+aes_encoder::~aes_encoder()
+{
+}
+
+uint32_t aes_encoder::encode( const char* plaintxt, uint32_t plaintext_len, const char* ciphertxt )
+{
+    int ciphertext_len = 0;
+    /* Provide the message to be encrypted, and obtain the encrypted output.
+    *    * EVP_EncryptUpdate can be called multiple times if necessary
+    *       */
+    if(1 != EVP_EncryptUpdate(my->ctx, (unsigned char*)ciphertxt, &ciphertext_len, (const unsigned char*)plaintxt, plaintext_len))
+    {
+        FC_THROW_EXCEPTION( exception, "error durring aes 256 cbc encryption update", 
+                           ("s", ERR_error_string( ERR_get_error(), nullptr) ) );
+    }
+    return ciphertext_len;
+}
+uint32_t aes_encoder::final_encode( const char* ciphertxt )
+{
+    int ciphertext_len = 0;
+    /* Finalise the encryption. Further ciphertext bytes may be written at
+    *    * this stage.
+    *       */
+    if(1 != EVP_EncryptFinal_ex(my->ctx, (unsigned char*)ciphertxt, &ciphertext_len)) 
+    {
+        FC_THROW_EXCEPTION( exception, "error durring aes 256 cbc encryption final", 
+                           ("s", ERR_error_string( ERR_get_error(), nullptr) ) );
+    }
+    return ciphertext_len;
+}
+
+
+
+
 /** example method from wiki.opensslfoundation.com */
 int aes_encrypt(unsigned char *plaintext, int plaintext_len, unsigned char *key,
               unsigned char *iv, unsigned char *ciphertext)
@@ -23,10 +84,10 @@ int aes_encrypt(unsigned char *plaintext, int plaintext_len, unsigned char *key,
     }
 
     /* Initialise the encryption operation. IMPORTANT - ensure you use a key
-    *    * and IV size appropriate for your cipher
-    *       * In this example we are using 256 bit AES (i.e. a 256 bit key). The
-    *          * IV size for *most* modes is the same as the block size. For AES this
-    *             * is 128 bits */
+    *    and IV size appropriate for your cipher
+    *    In this example we are using 256 bit AES (i.e. a 256 bit key). The
+    *    IV size for *most* modes is the same as the block size. For AES this
+    *    is 128 bits */
     if(1 != EVP_EncryptInit_ex(ctx, EVP_aes_256_cbc(), NULL, key, iv))
     {
         FC_THROW_EXCEPTION( exception, "error durring aes 256 cbc encryption init", 

src/crypto/hex.cpp

@@ -14,8 +14,9 @@ namespace fc {
       return 0;
     }
 
-    fc::string to_hex( const char* d, uint32_t s ) {
-        fc::string r;
+    std::string to_hex( const char* d, uint32_t s ) 
+    {
+        std::string r;
         const char* to_hex="0123456789abcdef";
         uint8_t* c = (uint8_t*)d;
         for( uint32_t i = 0; i < s; ++i )