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/*
* Block Ciphers via CommonCrypto
* (C) 2018 Jose Luis Pereira
*
* Botan is released under the Simplified BSD License (see license.txt)
*/
#include <botan/hex.h>
#include <botan/block_cipher.h>
#include <botan/internal/commoncrypto.h>
#include <CommonCrypto/CommonCrypto.h>
#include "commoncrypto_utils.h"
namespace Botan {
namespace {
class CommonCrypto_BlockCipher final : public BlockCipher
{
public:
CommonCrypto_BlockCipher(const std::string& name, const CommonCryptor_Opts& opts);
~CommonCrypto_BlockCipher();
void clear() override;
std::string provider() const override { return "commoncrypto"; }
std::string name() const override { return m_cipher_name; }
BlockCipher* clone() const override;
size_t block_size() const override { return m_opts.block_size; }
Key_Length_Specification key_spec() const override { return m_opts.key_spec; }
void encrypt_n(const uint8_t in[], uint8_t out[], size_t blocks) const override
{
verify_key_set(m_key_set);
size_t total_len = blocks * m_opts.block_size;
size_t out_len = 0;
CCCryptorStatus status = CCCryptorUpdate(m_encrypt, in, total_len,
out, total_len, &out_len);
if(status != kCCSuccess)
{
throw CommonCrypto_Error("CCCryptorUpdate encrypt", status);
}
}
void decrypt_n(const uint8_t in[], uint8_t out[], size_t blocks) const override
{
verify_key_set(m_key_set);
size_t total_len = blocks * m_opts.block_size;
size_t out_len = 0;
CCCryptorStatus status = CCCryptorUpdate(m_decrypt, in, total_len,
out, total_len, &out_len);
if(status != kCCSuccess)
{
throw CommonCrypto_Error("CCCryptorUpdate decrypt", status);
}
}
void key_schedule(const uint8_t key[], size_t key_len) override;
std::string m_cipher_name;
CommonCryptor_Opts m_opts;
CCCryptorRef m_encrypt = nullptr;
CCCryptorRef m_decrypt = nullptr;
bool m_key_set;
};
CommonCrypto_BlockCipher::CommonCrypto_BlockCipher(const std::string& algo_name,
const CommonCryptor_Opts& opts) :
m_cipher_name(algo_name),
m_opts(opts),
m_key_set(false)
{
}
CommonCrypto_BlockCipher::~CommonCrypto_BlockCipher()
{
if(m_encrypt)
{
CCCryptorRelease(m_encrypt);
}
if(m_decrypt)
{
CCCryptorRelease(m_decrypt);
}
}
/*
* Set the key
*/
void CommonCrypto_BlockCipher::key_schedule(const uint8_t key[], size_t length)
{
secure_vector<uint8_t> full_key(key, key + length);
commoncrypto_adjust_key_size(key, length, m_opts, full_key);
CCCryptorStatus status;
status = CCCryptorCreate(kCCEncrypt, m_opts.algo, kCCOptionECBMode,
full_key.data(), full_key.size(), nullptr, &m_encrypt);
if(status != kCCSuccess)
{
throw CommonCrypto_Error("CCCryptorCreate encrypt", status);
}
status = CCCryptorCreate(kCCDecrypt, m_opts.algo, kCCOptionECBMode,
full_key.data(), full_key.size(), nullptr, &m_decrypt);
if(status != kCCSuccess)
{
throw CommonCrypto_Error("CCCryptorCreate decrypt", status);
}
m_key_set = true;
}
/*
* Return a clone of this object
*/
BlockCipher* CommonCrypto_BlockCipher::clone() const
{
return new CommonCrypto_BlockCipher(m_cipher_name, m_opts);
}
/*
* Clear memory of sensitive data
*/
void CommonCrypto_BlockCipher::clear()
{
m_key_set = false;
}
}
std::unique_ptr<BlockCipher>
make_commoncrypto_block_cipher(const std::string& name)
{
try
{
CommonCryptor_Opts opts = commoncrypto_opts_from_algo(name);
return std::unique_ptr<BlockCipher>(new CommonCrypto_BlockCipher(name, opts));
}
catch(CommonCrypto_Error e)
{
return nullptr;
}
}
}
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