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Merge branch 'phoenix' of https://github.com/InvictusInnovations/fc into phoenix

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This commit is contained in:
dnotestein 2013-09-05 20:38:29 -04:00
commit 0e810c4df4
2 changed files with 88 additions and 5 deletions
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17
include/fc/crypto/aes.hpp
View file

@ -11,9 +11,24 @@ namespace fc {
class aes_encoder
{
public:
aes_encoder( const fc::sha256& key, const fc::uint128& init_value );
aes_encoder();
~aes_encoder();
void init( const fc::sha256& key, const fc::uint128& init_value );
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;
};
class aes_decoder
{
public:
aes_decoder();
~aes_decoder();
void init( const fc::sha256& key, const fc::uint128& init_value );
uint32_t encode( const char* plaintxt, uint32_t len, const char* ciphertxt );
uint32_t final_encode( const char* ciphertxt );

76
src/crypto/aes.cpp
View file

@ -15,7 +15,11 @@ struct aes_encoder::impl
evp_cipher_ctx ctx;
};
aes_encoder::aes_encoder( const fc::sha256& key, const fc::uint128& init_value )
aes_encoder::aes_encoder(){}
aes_encoder::~aes_encoder()
{
}
void aes_encoder::init( const fc::sha256& key, const fc::uint128& init_value )
{
my->ctx.obj = EVP_CIPHER_CTX_new();
/* Create and initialise the context */
@ -36,9 +40,6 @@ aes_encoder::aes_encoder( const fc::sha256& key, const fc::uint128& init_value )
("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 )
{
@ -68,6 +69,73 @@ uint32_t aes_encoder::final_encode( const char* ciphertxt )
}
struct aes_decoder::impl
{
evp_cipher_ctx ctx;
};
aes_decoder::aes_decoder(){}
void aes_decoder::init( 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_DecryptInit_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_decoder::~aes_decoder()
{
}
uint32_t aes_decoder::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_DecryptUpdate can be called multiple times if necessary
* */
if(1 != EVP_DecryptUpdate(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_decoder::final_encode( const char* ciphertxt )
{
int ciphertext_len = 0;
/* Finalise the encryption. Further ciphertext bytes may be written at
* * this stage.
* */
if(1 != EVP_DecryptFinal_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 */