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/*
* Block Ciphers via OpenSSL
* (C) 1999-2010,2015 Jack Lloyd
*
* Botan is released under the Simplified BSD License (see license.txt)
*/
#include <botan/block_cipher.h>
#include <botan/internal/openssl.h>
#include <openssl/evp.h>
namespace Botan {
namespace {
class OpenSSL_BlockCipher final : public BlockCipher
{
public:
OpenSSL_BlockCipher(const std::string& name,
const EVP_CIPHER* cipher);
OpenSSL_BlockCipher(const std::string& name,
const EVP_CIPHER* cipher,
size_t kl_min, size_t kl_max, size_t kl_mod);
~OpenSSL_BlockCipher();
void clear() override;
std::string provider() const override { return "openssl"; }
std::string name() const override { return m_cipher_name; }
BlockCipher* clone() const override;
size_t block_size() const override { return m_block_sz; }
Key_Length_Specification key_spec() const override { return m_cipher_key_spec; }
void encrypt_n(const uint8_t in[], uint8_t out[], size_t blocks) const override
{
verify_key_set(m_key_set);
int out_len = 0;
if(!EVP_EncryptUpdate(m_encrypt, out, &out_len, in, blocks * m_block_sz))
throw OpenSSL_Error("EVP_EncryptUpdate", ERR_get_error());
}
void decrypt_n(const uint8_t in[], uint8_t out[], size_t blocks) const override
{
verify_key_set(m_key_set);
int out_len = 0;
if(!EVP_DecryptUpdate(m_decrypt, out, &out_len, in, blocks * m_block_sz))
throw OpenSSL_Error("EVP_DecryptUpdate", ERR_get_error());
}
void key_schedule(const uint8_t key[], size_t key_len) override;
size_t m_block_sz;
Key_Length_Specification m_cipher_key_spec;
std::string m_cipher_name;
EVP_CIPHER_CTX *m_encrypt;
EVP_CIPHER_CTX *m_decrypt;
bool m_key_set;
};
OpenSSL_BlockCipher::OpenSSL_BlockCipher(const std::string& algo_name,
const EVP_CIPHER* algo) :
m_block_sz(EVP_CIPHER_block_size(algo)),
m_cipher_key_spec(EVP_CIPHER_key_length(algo)),
m_cipher_name(algo_name),
m_key_set(false)
{
if(EVP_CIPHER_mode(algo) != EVP_CIPH_ECB_MODE)
throw Invalid_Argument("OpenSSL_BlockCipher: Non-ECB EVP was passed in");
m_encrypt = EVP_CIPHER_CTX_new();
m_decrypt = EVP_CIPHER_CTX_new();
if (m_encrypt == nullptr || m_decrypt == nullptr)
throw OpenSSL_Error("Can't allocate new context", ERR_get_error());
EVP_CIPHER_CTX_init(m_encrypt);
EVP_CIPHER_CTX_init(m_decrypt);
if(!EVP_EncryptInit_ex(m_encrypt, algo, nullptr, nullptr, nullptr))
throw OpenSSL_Error("EVP_EncryptInit_ex", ERR_get_error());
if(!EVP_DecryptInit_ex(m_decrypt, algo, nullptr, nullptr, nullptr))
throw OpenSSL_Error("EVP_DecryptInit_ex", ERR_get_error());
if(!EVP_CIPHER_CTX_set_padding(m_encrypt, 0))
throw OpenSSL_Error("EVP_CIPHER_CTX_set_padding encrypt", ERR_get_error());
if(!EVP_CIPHER_CTX_set_padding(m_decrypt, 0))
throw OpenSSL_Error("EVP_CIPHER_CTX_set_padding decrypt", ERR_get_error());
}
OpenSSL_BlockCipher::OpenSSL_BlockCipher(const std::string& algo_name,
const EVP_CIPHER* algo,
size_t key_min,
size_t key_max,
size_t key_mod) :
m_block_sz(EVP_CIPHER_block_size(algo)),
m_cipher_key_spec(key_min, key_max, key_mod),
m_cipher_name(algo_name),
m_key_set(false)
{
if(EVP_CIPHER_mode(algo) != EVP_CIPH_ECB_MODE)
throw Invalid_Argument("OpenSSL_BlockCipher: Non-ECB EVP was passed in");
m_encrypt = EVP_CIPHER_CTX_new();
m_decrypt = EVP_CIPHER_CTX_new();
if (m_encrypt == nullptr || m_decrypt == nullptr)
throw OpenSSL_Error("Can't allocate new context", ERR_get_error());
EVP_CIPHER_CTX_init(m_encrypt);
EVP_CIPHER_CTX_init(m_decrypt);
if(!EVP_EncryptInit_ex(m_encrypt, algo, nullptr, nullptr, nullptr))
throw OpenSSL_Error("EVP_EncryptInit_ex", ERR_get_error());
if(!EVP_DecryptInit_ex(m_decrypt, algo, nullptr, nullptr, nullptr))
throw OpenSSL_Error("EVP_DecryptInit_ex", ERR_get_error());
if(!EVP_CIPHER_CTX_set_padding(m_encrypt, 0))
throw OpenSSL_Error("EVP_CIPHER_CTX_set_padding encrypt", ERR_get_error());
if(!EVP_CIPHER_CTX_set_padding(m_decrypt, 0))
throw OpenSSL_Error("EVP_CIPHER_CTX_set_padding decrypt", ERR_get_error());
}
OpenSSL_BlockCipher::~OpenSSL_BlockCipher()
{
EVP_CIPHER_CTX_cleanup(m_encrypt);
EVP_CIPHER_CTX_cleanup(m_decrypt);
EVP_CIPHER_CTX_free(m_encrypt);
EVP_CIPHER_CTX_free(m_decrypt);
}
/*
* Set the key
*/
void OpenSSL_BlockCipher::key_schedule(const uint8_t key[], size_t length)
{
secure_vector<uint8_t> full_key(key, key + length);
if(m_cipher_name == "TripleDES" && length == 16)
{
full_key += std::make_pair(key, 8);
}
else
{
if(EVP_CIPHER_CTX_set_key_length(m_encrypt, length) == 0 ||
EVP_CIPHER_CTX_set_key_length(m_decrypt, length) == 0)
throw Invalid_Argument("OpenSSL_BlockCipher: Bad key length for " +
m_cipher_name);
}
if(!EVP_EncryptInit_ex(m_encrypt, nullptr, nullptr, full_key.data(), nullptr))
throw OpenSSL_Error("EVP_EncryptInit_ex", ERR_get_error());
if(!EVP_DecryptInit_ex(m_decrypt, nullptr, nullptr, full_key.data(), nullptr))
throw OpenSSL_Error("EVP_DecryptInit_ex", ERR_get_error());
m_key_set = true;
}
/*
* Return a clone of this object
*/
BlockCipher* OpenSSL_BlockCipher::clone() const
{
return new OpenSSL_BlockCipher(m_cipher_name,
EVP_CIPHER_CTX_cipher(m_encrypt),
m_cipher_key_spec.minimum_keylength(),
m_cipher_key_spec.maximum_keylength(),
m_cipher_key_spec.keylength_multiple());
}
/*
* Clear memory of sensitive data
*/
void OpenSSL_BlockCipher::clear()
{
const EVP_CIPHER* algo = EVP_CIPHER_CTX_cipher(m_encrypt);
m_key_set = false;
if(!EVP_CIPHER_CTX_cleanup(m_encrypt))
throw OpenSSL_Error("EVP_CIPHER_CTX_cleanup encrypt", ERR_get_error());
if(!EVP_CIPHER_CTX_cleanup(m_decrypt))
throw OpenSSL_Error("EVP_CIPHER_CTX_cleanup decrypt", ERR_get_error());
EVP_CIPHER_CTX_init(m_encrypt);
EVP_CIPHER_CTX_init(m_decrypt);
if(!EVP_EncryptInit_ex(m_encrypt, algo, nullptr, nullptr, nullptr))
throw OpenSSL_Error("EVP_EncryptInit_ex", ERR_get_error());
if(!EVP_DecryptInit_ex(m_decrypt, algo, nullptr, nullptr, nullptr))
throw OpenSSL_Error("EVP_DecryptInit_ex", ERR_get_error());
if(!EVP_CIPHER_CTX_set_padding(m_encrypt, 0))
throw OpenSSL_Error("EVP_CIPHER_CTX_set_padding encrypt", ERR_get_error());
if(!EVP_CIPHER_CTX_set_padding(m_decrypt, 0))
throw OpenSSL_Error("EVP_CIPHER_CTX_set_padding decrypt", ERR_get_error());
}
}
std::unique_ptr<BlockCipher>
make_openssl_block_cipher(const std::string& name)
{
#define MAKE_OPENSSL_BLOCK(evp_fn) \
std::unique_ptr<BlockCipher>(new OpenSSL_BlockCipher(name, evp_fn()))
#define MAKE_OPENSSL_BLOCK_KEYLEN(evp_fn, kl_min, kl_max, kl_mod) \
std::unique_ptr<BlockCipher>(new OpenSSL_BlockCipher(name, evp_fn(), kl_min, kl_max, kl_mod))
#if defined(BOTAN_HAS_AES) && !defined(OPENSSL_NO_AES)
if(name == "AES-128")
return MAKE_OPENSSL_BLOCK(EVP_aes_128_ecb);
if(name == "AES-192")
return MAKE_OPENSSL_BLOCK(EVP_aes_192_ecb);
if(name == "AES-256")
return MAKE_OPENSSL_BLOCK(EVP_aes_256_ecb);
#endif
#if defined(BOTAN_HAS_CAMELLIA) && !defined(OPENSSL_NO_CAMELLIA)
if(name == "Camellia-128")
return MAKE_OPENSSL_BLOCK(EVP_camellia_128_ecb);
if(name == "Camellia-192")
return MAKE_OPENSSL_BLOCK(EVP_camellia_192_ecb);
if(name == "Camellia-256")
return MAKE_OPENSSL_BLOCK(EVP_camellia_256_ecb);
#endif
#if defined(BOTAN_HAS_DES) && !defined(OPENSSL_NO_DES)
if(name == "TripleDES")
return MAKE_OPENSSL_BLOCK_KEYLEN(EVP_des_ede3_ecb, 16, 24, 8);
#endif
return nullptr;
}
}
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