Botan
1.11.15
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#include <ofb.h>
Public Types | |
typedef SCAN_Name | Spec |
Public Member Functions | |
void | cipher (const byte in[], byte out[], size_t length) |
void | cipher1 (byte buf[], size_t len) |
void | clear () |
OFB * | clone () const |
template<typename Alloc > | |
void | decrypt (std::vector< byte, Alloc > &inout) |
template<typename Alloc > | |
void | encipher (std::vector< byte, Alloc > &inout) |
template<typename Alloc > | |
void | encrypt (std::vector< byte, Alloc > &inout) |
Key_Length_Specification | key_spec () const |
size_t | maximum_keylength () const |
size_t | minimum_keylength () const |
std::string | name () const |
OFB (BlockCipher *cipher) | |
void | set_iv (const byte iv[], size_t iv_len) |
void | set_key (const SymmetricKey &key) |
template<typename Alloc > | |
void | set_key (const std::vector< byte, Alloc > &key) |
void | set_key (const byte key[], size_t length) |
bool | valid_iv_length (size_t iv_len) const |
bool | valid_keylength (size_t length) const |
Static Public Member Functions | |
static OFB * | make (const Spec &spec) |
typedef SCAN_Name Botan::StreamCipher::Spec [inherited] |
Definition at line 73 of file stream_cipher.h.
Botan::OFB::OFB | ( | BlockCipher * | cipher | ) |
void Botan::OFB::cipher | ( | const byte | in[], |
byte | out[], | ||
size_t | len | ||
) | [virtual] |
Encrypt or decrypt a message
in | the plaintext |
out | the byte array to hold the output, i.e. the ciphertext |
len | the length of both in and out in bytes |
Implements Botan::StreamCipher.
Definition at line 52 of file ofb.cpp.
References Botan::xor_buf().
{ while(length >= m_buffer.size() - m_buf_pos) { xor_buf(out, in, &m_buffer[m_buf_pos], m_buffer.size() - m_buf_pos); length -= (m_buffer.size() - m_buf_pos); in += (m_buffer.size() - m_buf_pos); out += (m_buffer.size() - m_buf_pos); m_cipher->encrypt(m_buffer); m_buf_pos = 0; } xor_buf(out, in, &m_buffer[m_buf_pos], length); m_buf_pos += length; }
void Botan::StreamCipher::cipher1 | ( | byte | buf[], |
size_t | len | ||
) | [inline, inherited] |
Encrypt or decrypt a message
buf | the plaintext / ciphertext |
len | the length of buf in bytes |
Definition at line 36 of file stream_cipher.h.
Referenced by Botan::SIV_Encryption::finish().
{ cipher(buf, buf, len); }
void Botan::OFB::clear | ( | ) | [virtual] |
Implements Botan::SymmetricAlgorithm.
Definition at line 32 of file ofb.cpp.
References Botan::zeroise().
{ m_cipher->clear(); zeroise(m_buffer); m_buf_pos = 0; }
OFB* Botan::OFB::clone | ( | ) | const [inline, virtual] |
Get a new object representing the same algorithm as *this
Implements Botan::StreamCipher.
Definition at line 36 of file ofb.h.
{ return new OFB(m_cipher->clone()); }
void Botan::StreamCipher::decrypt | ( | std::vector< byte, Alloc > & | inout | ) | [inline, inherited] |
Definition at line 48 of file stream_cipher.h.
{ cipher(&inout[0], &inout[0], inout.size()); }
void Botan::StreamCipher::encipher | ( | std::vector< byte, Alloc > & | inout | ) | [inline, inherited] |
Definition at line 40 of file stream_cipher.h.
{ cipher(&inout[0], &inout[0], inout.size()); }
void Botan::StreamCipher::encrypt | ( | std::vector< byte, Alloc > & | inout | ) | [inline, inherited] |
Definition at line 44 of file stream_cipher.h.
{ cipher(&inout[0], &inout[0], inout.size()); }
Key_Length_Specification Botan::OFB::key_spec | ( | ) | const [inline, virtual] |
Implements Botan::SymmetricAlgorithm.
Definition at line 29 of file ofb.h.
{
return m_cipher->key_spec();
}
OFB * Botan::OFB::make | ( | const Spec & | spec | ) | [static] |
Definition at line 15 of file ofb.cpp.
References Botan::SCAN_Name::algo_name(), Botan::SCAN_Name::arg(), Botan::SCAN_Name::arg_count(), c, Botan::Algo_Registry< T >::make(), and OFB().
size_t Botan::SymmetricAlgorithm::maximum_keylength | ( | ) | const [inline, inherited] |
Definition at line 36 of file sym_algo.h.
References Botan::Key_Length_Specification::maximum_keylength().
{ return key_spec().maximum_keylength(); }
size_t Botan::SymmetricAlgorithm::minimum_keylength | ( | ) | const [inline, inherited] |
Definition at line 44 of file sym_algo.h.
{ return key_spec().minimum_keylength(); }
std::string Botan::OFB::name | ( | ) | const [virtual] |
Implements Botan::SymmetricAlgorithm.
Definition at line 47 of file ofb.cpp.
Referenced by set_iv().
{ return "OFB(" + m_cipher->name() + ")"; }
void Botan::OFB::set_iv | ( | const byte | [], |
size_t | iv_len | ||
) | [virtual] |
Resync the cipher using the IV
iv | the initialization vector |
iv_len | the length of the IV in bytes |
Reimplemented from Botan::StreamCipher.
Definition at line 67 of file ofb.cpp.
References Botan::buffer_insert(), name(), valid_iv_length(), and Botan::zeroise().
{ if(!valid_iv_length(iv_len)) throw Invalid_IV_Length(name(), iv_len); zeroise(m_buffer); buffer_insert(m_buffer, 0, iv, iv_len); m_cipher->encrypt(m_buffer); m_buf_pos = 0; }
void Botan::SymmetricAlgorithm::set_key | ( | const SymmetricKey & | key | ) | [inline, inherited] |
Set the symmetric key of this object.
key | the SymmetricKey to be set. |
Definition at line 63 of file sym_algo.h.
References Botan::OctetString::begin(), and Botan::OctetString::length().
Referenced by Botan::aont_package(), Botan::aont_unpackage(), botan_mac_set_key(), Botan::TLS::Session::decrypt(), Botan::TLS::Session::encrypt(), and Botan::pbkdf2().
{ set_key(key.begin(), key.length()); }
void Botan::SymmetricAlgorithm::set_key | ( | const std::vector< byte, Alloc > & | key | ) | [inline, inherited] |
Definition at line 69 of file sym_algo.h.
{ set_key(&key[0], key.size()); }
void Botan::SymmetricAlgorithm::set_key | ( | const byte | key[], |
size_t | length | ||
) | [inline, inherited] |
Set the symmetric key of this object.
key | the to be set as a byte array. |
length | in bytes of key param |
Definition at line 79 of file sym_algo.h.
{ if(!valid_keylength(length)) throw Invalid_Key_Length(name(), length); key_schedule(key, length); }
bool Botan::OFB::valid_iv_length | ( | size_t | iv_len | ) | const [inline, virtual] |
iv_len | the length of the IV in bytes |
Reimplemented from Botan::StreamCipher.
Definition at line 26 of file ofb.h.
Referenced by set_iv().
{ return (iv_len <= m_cipher->block_size()); }
bool Botan::SymmetricAlgorithm::valid_keylength | ( | size_t | length | ) | const [inline, inherited] |
Check whether a given key length is valid for this algorithm.
length | the key length to be checked. |
Definition at line 54 of file sym_algo.h.
Referenced by Botan::aont_package(), and Botan::aont_unpackage().
{ return key_spec().valid_keylength(length); }