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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 : 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 byte in[], byte out[], size_t blocks) const override
{
int out_len = 0;
EVP_EncryptUpdate(&m_encrypt, out, &out_len, in, blocks * m_block_sz);
}
void decrypt_n(const byte in[], byte out[], size_t blocks) const override
{
int out_len = 0;
EVP_DecryptUpdate(&m_decrypt, out, &out_len, in, blocks * m_block_sz);
}
void key_schedule(const byte key[], size_t key_len) override;
size_t m_block_sz;
Key_Length_Specification m_cipher_key_spec;
std::string m_cipher_name;
mutable EVP_CIPHER_CTX m_encrypt, m_decrypt;
};
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)
{
if(EVP_CIPHER_mode(algo) != EVP_CIPH_ECB_MODE)
throw Invalid_Argument("OpenSSL_BlockCipher: Non-ECB EVP was passed in");
EVP_CIPHER_CTX_init(&m_encrypt);
EVP_CIPHER_CTX_init(&m_decrypt);
EVP_EncryptInit_ex(&m_encrypt, algo, nullptr, nullptr, nullptr);
EVP_DecryptInit_ex(&m_decrypt, algo, nullptr, nullptr, nullptr);
EVP_CIPHER_CTX_set_padding(&m_encrypt, 0);
EVP_CIPHER_CTX_set_padding(&m_decrypt, 0);
}
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)
{
if(EVP_CIPHER_mode(algo) != EVP_CIPH_ECB_MODE)
throw Invalid_Argument("OpenSSL_BlockCipher: Non-ECB EVP was passed in");
EVP_CIPHER_CTX_init(&m_encrypt);
EVP_CIPHER_CTX_init(&m_decrypt);
EVP_EncryptInit_ex(&m_encrypt, algo, nullptr, nullptr, nullptr);
EVP_DecryptInit_ex(&m_decrypt, algo, nullptr, nullptr, nullptr);
EVP_CIPHER_CTX_set_padding(&m_encrypt, 0);
EVP_CIPHER_CTX_set_padding(&m_decrypt, 0);
}
OpenSSL_BlockCipher::~OpenSSL_BlockCipher()
{
EVP_CIPHER_CTX_cleanup(&m_encrypt);
EVP_CIPHER_CTX_cleanup(&m_decrypt);
}
/*
* Set the key
*/
void OpenSSL_BlockCipher::key_schedule(const byte key[], size_t length)
{
secure_vector<byte> 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);
EVP_EncryptInit_ex(&m_encrypt, nullptr, nullptr, full_key.data(), nullptr);
EVP_DecryptInit_ex(&m_decrypt, nullptr, nullptr, full_key.data(), nullptr);
}
/*
* 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);
EVP_CIPHER_CTX_cleanup(&m_encrypt);
EVP_CIPHER_CTX_cleanup(&m_decrypt);
EVP_CIPHER_CTX_init(&m_encrypt);
EVP_CIPHER_CTX_init(&m_decrypt);
EVP_EncryptInit_ex(&m_encrypt, algo, nullptr, nullptr, nullptr);
EVP_DecryptInit_ex(&m_decrypt, algo, nullptr, nullptr, nullptr);
EVP_CIPHER_CTX_set_padding(&m_encrypt, 0);
EVP_CIPHER_CTX_set_padding(&m_decrypt, 0);
}
}
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 == "DES")
return MAKE_OPENSSL_BLOCK(EVP_des_ecb);
if(name == "TripleDES")
return MAKE_OPENSSL_BLOCK_KEYLEN(EVP_des_ede3_ecb, 16, 24, 8);
#endif
#if defined(BOTAN_HAS_BLOWFISH) && !defined(OPENSSL_NO_BF)
if(name == "Blowfish")
return MAKE_OPENSSL_BLOCK_KEYLEN(EVP_bf_ecb, 1, 56, 1);
#endif
#if defined(BOTAN_HAS_CAST) && !defined(OPENSSL_NO_CAST)
if(name == "CAST-128")
return MAKE_OPENSSL_BLOCK_KEYLEN(EVP_cast5_ecb, 1, 16, 1);
#endif
#if defined(BOTAN_HAS_IDEA) && !defined(OPENSSL_NO_IDEA)
if(name == "IDEA")
return MAKE_OPENSSL_BLOCK(EVP_idea_ecb);
#endif
#if defined(BOTAN_HAS_SEED) && !defined(OPENSSL_NO_SEED)
if(name == "SEED")
return MAKE_OPENSSL_BLOCK(EVP_seed_ecb);
#endif
return nullptr;
}
}
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