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/*
* Filters
* (C) 1999-2007,2015 Jack Lloyd
*
* Botan is released under the Simplified BSD License (see license.txt)
*/
#ifndef BOTAN_FILTERS_H_
#define BOTAN_FILTERS_H_
#include <botan/basefilt.h>
#include <botan/key_filt.h>
#include <botan/data_snk.h>
#include <botan/pipe.h>
#if defined(BOTAN_HAS_STREAM_CIPHER)
#include <botan/stream_cipher.h>
#endif
#if defined(BOTAN_HAS_HASH)
#include <botan/hash.h>
#endif
#if defined(BOTAN_HAS_MAC)
#include <botan/mac.h>
#endif
#if defined(BOTAN_HAS_CODEC_FILTERS)
#include <botan/b64_filt.h>
#include <botan/hex_filt.h>
#endif
namespace Botan {
#if defined(BOTAN_HAS_STREAM_CIPHER)
/**
* Stream Cipher Filter
*/
class BOTAN_PUBLIC_API(2,0) StreamCipher_Filter final : public Keyed_Filter
{
public:
std::string name() const override { return m_cipher->name(); }
/**
* Write input data
* @param input data
* @param input_len length of input in bytes
*/
void write(const uint8_t input[], size_t input_len) override;
bool valid_iv_length(size_t iv_len) const override
{ return m_cipher->valid_iv_length(iv_len); }
/**
* Set the initialization vector for this filter.
* @param iv the initialization vector to set
*/
void set_iv(const InitializationVector& iv) override
{
m_cipher->set_iv(iv.begin(), iv.length());
}
/**
* Set the key of this filter.
* @param key the key to set
*/
void set_key(const SymmetricKey& key) override { m_cipher->set_key(key); }
Key_Length_Specification key_spec() const override { return m_cipher->key_spec(); }
/**
* Construct a stream cipher filter.
* @param cipher a cipher object to use
*/
explicit StreamCipher_Filter(StreamCipher* cipher);
/**
* Construct a stream cipher filter.
* @param cipher a cipher object to use
* @param key the key to use inside this filter
*/
StreamCipher_Filter(StreamCipher* cipher, const SymmetricKey& key);
/**
* Construct a stream cipher filter.
* @param cipher the name of the desired cipher
*/
explicit StreamCipher_Filter(const std::string& cipher);
/**
* Construct a stream cipher filter.
* @param cipher the name of the desired cipher
* @param key the key to use inside this filter
*/
StreamCipher_Filter(const std::string& cipher, const SymmetricKey& key);
private:
secure_vector<uint8_t> m_buffer;
std::unique_ptr<StreamCipher> m_cipher;
};
#endif
#if defined(BOTAN_HAS_HASH)
/**
* Hash Filter.
*/
class BOTAN_PUBLIC_API(2,0) Hash_Filter final : public Filter
{
public:
void write(const uint8_t input[], size_t len) override { m_hash->update(input, len); }
void end_msg() override;
std::string name() const override { return m_hash->name(); }
/**
* Construct a hash filter.
* @param hash the hash function to use
* @param len the output length of this filter. Leave the default
* value 0 if you want to use the full output of the hashfunction
* hash. Otherwise, specify a smaller value here so that the
* output of the hash algorithm will be cut off.
*/
Hash_Filter(HashFunction* hash, size_t len = 0) :
m_hash(hash), m_out_len(len) {}
/**
* Construct a hash filter.
* @param request the name of the hash algorithm to use
* @param len the output length of this filter. Leave the default
* value 0 if you want to use the full output of the hashfunction
* hash. Otherwise, specify a smaller value here so that the
* output of the hash algorithm will be cut off.
*/
Hash_Filter(const std::string& request, size_t len = 0);
private:
std::unique_ptr<HashFunction> m_hash;
const size_t m_out_len;
};
#endif
#if defined(BOTAN_HAS_MAC)
/**
* MessageAuthenticationCode Filter.
*/
class BOTAN_PUBLIC_API(2,0) MAC_Filter final : public Keyed_Filter
{
public:
void write(const uint8_t input[], size_t len) override { m_mac->update(input, len); }
void end_msg() override;
std::string name() const override { return m_mac->name(); }
/**
* Set the key of this filter.
* @param key the key to set
*/
void set_key(const SymmetricKey& key) override { m_mac->set_key(key); }
Key_Length_Specification key_spec() const override { return m_mac->key_spec(); }
/**
* Construct a MAC filter. The MAC key will be left empty.
* @param mac the MAC to use
* @param out_len the output length of this filter. Leave the default
* value 0 if you want to use the full output of the
* MAC. Otherwise, specify a smaller value here so that the
* output of the MAC will be cut off.
*/
MAC_Filter(MessageAuthenticationCode* mac,
size_t out_len = 0) :
m_mac(mac),
m_out_len(out_len)
{
}
/**
* Construct a MAC filter.
* @param mac the MAC to use
* @param key the MAC key to use
* @param out_len the output length of this filter. Leave the default
* value 0 if you want to use the full output of the
* MAC. Otherwise, specify a smaller value here so that the
* output of the MAC will be cut off.
*/
MAC_Filter(MessageAuthenticationCode* mac,
const SymmetricKey& key,
size_t out_len = 0) :
m_mac(mac),
m_out_len(out_len)
{
m_mac->set_key(key);
}
/**
* Construct a MAC filter. The MAC key will be left empty.
* @param mac the name of the MAC to use
* @param len the output length of this filter. Leave the default
* value 0 if you want to use the full output of the
* MAC. Otherwise, specify a smaller value here so that the
* output of the MAC will be cut off.
*/
MAC_Filter(const std::string& mac, size_t len = 0);
/**
* Construct a MAC filter.
* @param mac the name of the MAC to use
* @param key the MAC key to use
* @param len the output length of this filter. Leave the default
* value 0 if you want to use the full output of the
* MAC. Otherwise, specify a smaller value here so that the
* output of the MAC will be cut off.
*/
MAC_Filter(const std::string& mac, const SymmetricKey& key,
size_t len = 0);
private:
std::unique_ptr<MessageAuthenticationCode> m_mac;
const size_t m_out_len;
};
#endif
}
#endif
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