Botan
1.11.15
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#include <chacha20poly1305.h>
Public Types | |
typedef SCAN_Name | Spec |
Public Member Functions | |
bool | authenticated () const override |
void | clear () override |
size_t | default_nonce_length () const override |
void | finish (secure_vector< byte > &final_block, size_t offset=0) override |
Key_Length_Specification | key_spec () const override |
size_t | minimum_final_size () const override |
std::string | name () const override |
size_t | output_length (size_t input_length) const override |
virtual std::string | provider () const |
template<typename Alloc > | |
void | set_ad (const std::vector< byte, Alloc > &ad) |
void | set_associated_data (const byte ad[], size_t ad_len) override |
template<typename Alloc > | |
void | set_associated_data_vec (const std::vector< byte, Alloc > &ad) |
template<typename Alloc > | |
void | set_key (const std::vector< byte, Alloc > &key) |
void | set_key (const SymmetricKey &key) |
void | set_key (const byte key[], size_t length) |
template<typename Alloc > | |
secure_vector< byte > | start (const std::vector< byte, Alloc > &nonce) |
secure_vector< byte > | start (const byte nonce[], size_t nonce_len) |
secure_vector< byte > | start () |
template<typename Alloc > | |
secure_vector< byte > | start_vec (const std::vector< byte, Alloc > &nonce) |
size_t | tag_size () const override |
void | update (secure_vector< byte > &blocks, size_t offset=0) override |
size_t | update_granularity () const override |
bool | valid_keylength (size_t length) const |
bool | valid_nonce_length (size_t n) const override |
Protected Member Functions | |
bool | cfrg_version () const |
void | update_len (size_t len) |
Protected Attributes | |
secure_vector< byte > | m_ad |
std::unique_ptr< StreamCipher > | m_chacha |
size_t | m_ctext_len = 0 |
size_t | m_nonce_len = 0 |
std::unique_ptr < MessageAuthenticationCode > | m_poly1305 |
ChaCha20Poly1305 Encryption
Definition at line 59 of file chacha20poly1305.h.
typedef SCAN_Name Botan::Transform::Spec [inherited] |
Definition at line 27 of file transform.h.
bool Botan::AEAD_Mode::authenticated | ( | ) | const [inline, override, virtual, inherited] |
Returns true iff this mode provides authentication as well as confidentiality.
Reimplemented from Botan::Cipher_Mode.
Definition at line 25 of file aead.h.
{ return true; }
bool Botan::ChaCha20Poly1305_Mode::cfrg_version | ( | ) | const [inline, protected, inherited] |
Definition at line 48 of file chacha20poly1305.h.
Referenced by finish(), and Botan::ChaCha20Poly1305_Decryption::finish().
{ return m_nonce_len == 12; }
void Botan::ChaCha20Poly1305_Mode::clear | ( | ) | [override, virtual, inherited] |
Implements Botan::Transform.
Definition at line 21 of file chacha20poly1305.cpp.
References Botan::ChaCha20Poly1305_Mode::m_ad, Botan::ChaCha20Poly1305_Mode::m_chacha, Botan::ChaCha20Poly1305_Mode::m_ctext_len, and Botan::ChaCha20Poly1305_Mode::m_poly1305.
{ m_chacha.reset(); m_poly1305.reset(); m_ad.clear(); m_ctext_len = 0; }
size_t Botan::AEAD_Mode::default_nonce_length | ( | ) | const [inline, override, virtual, inherited] |
Default AEAD nonce size (a commonly supported value among AEAD modes, and large enough that random collisions are unlikely).
Implements Botan::Transform.
Reimplemented in Botan::CCM_Mode.
Definition at line 57 of file aead.h.
{ return 12; }
void Botan::ChaCha20Poly1305_Encryption::finish | ( | secure_vector< byte > & | final_block, |
size_t | offset = 0 |
||
) | [override, virtual] |
Complete processing of a message.
final_block | in/out parameter which must be at least minimum_final_size() bytes, and will be set to any final output |
offset | an offset into final_block to begin processing |
Implements Botan::Transform.
Definition at line 94 of file chacha20poly1305.cpp.
References Botan::ChaCha20Poly1305_Mode::cfrg_version(), Botan::ChaCha20Poly1305_Mode::m_ad, Botan::ChaCha20Poly1305_Mode::m_ctext_len, Botan::ChaCha20Poly1305_Mode::m_poly1305, mac, Botan::ChaCha20Poly1305_Mode::tag_size(), update(), and Botan::ChaCha20Poly1305_Mode::update_len().
{ update(buffer, offset); if(cfrg_version()) { std::vector<byte> padding(16 - m_ctext_len % 16); m_poly1305->update(padding); update_len(m_ad.size()); } update_len(m_ctext_len); const secure_vector<byte> mac = m_poly1305->final(); buffer += std::make_pair(&mac[0], tag_size()); m_ctext_len = 0; }
Key_Length_Specification Botan::ChaCha20Poly1305_Mode::key_spec | ( | ) | const [inline, override, virtual, inherited] |
Implements Botan::Keyed_Transform.
Definition at line 32 of file chacha20poly1305.h.
{ return Key_Length_Specification(32); }
size_t Botan::ChaCha20Poly1305_Encryption::minimum_final_size | ( | ) | const [inline, override, virtual] |
Implements Botan::Transform.
Definition at line 65 of file chacha20poly1305.h.
{ return 0; }
std::string Botan::ChaCha20Poly1305_Mode::name | ( | ) | const [inline, override, virtual, inherited] |
Implements Botan::Transform.
Definition at line 28 of file chacha20poly1305.h.
{ return "ChaCha20Poly1305"; }
size_t Botan::ChaCha20Poly1305_Encryption::output_length | ( | size_t | input_length | ) | const [inline, override, virtual] |
Returns the size of the output if this transform is used to process a message with input_length bytes. Will throw if unable to give a precise answer.
Implements Botan::Transform.
Definition at line 62 of file chacha20poly1305.h.
{ return input_length + tag_size(); }
virtual std::string Botan::Transform::provider | ( | ) | const [inline, virtual, inherited] |
Return some short name describing the provider of this tranformation. Useful in cases where multiple implementations are available (eg, different implementations of AES). Default "core" is used for the 'standard' implementation included in the library.
Definition at line 120 of file transform.h.
{ return "core"; }
void Botan::AEAD_Mode::set_ad | ( | const std::vector< byte, Alloc > & | ad | ) | [inline, inherited] |
Definition at line 48 of file aead.h.
{ set_associated_data(&ad[0], ad.size()); }
void Botan::ChaCha20Poly1305_Mode::set_associated_data | ( | const byte | ad[], |
size_t | ad_len | ||
) | [override, virtual, inherited] |
Set associated data that is not included in the ciphertext but that should be authenticated. Must be called after set_key and before start.
Unless reset by another call, the associated data is kept between messages. Thus, if the AD does not change, calling once (after set_key) is the optimum.
ad | the associated data |
ad_len | length of add in bytes |
Implements Botan::AEAD_Mode.
Definition at line 36 of file chacha20poly1305.cpp.
References Botan::ChaCha20Poly1305_Mode::m_ad, and Botan::ChaCha20Poly1305_Mode::m_ctext_len.
{ if(m_ctext_len) throw std::runtime_error("Too late to set AD for ChaCha20Poly1305"); m_ad.assign(ad, ad + length); }
void Botan::AEAD_Mode::set_associated_data_vec | ( | const std::vector< byte, Alloc > & | ad | ) | [inline, inherited] |
Definition at line 42 of file aead.h.
{ set_associated_data(&ad[0], ad.size()); }
void Botan::Keyed_Transform::set_key | ( | const std::vector< byte, Alloc > & | key | ) | [inline, inherited] |
Definition at line 148 of file transform.h.
Referenced by botan_cipher_set_key().
{ set_key(&key[0], key.size()); }
void Botan::Keyed_Transform::set_key | ( | const SymmetricKey & | key | ) | [inline, inherited] |
Definition at line 153 of file transform.h.
References Botan::OctetString::begin(), and Botan::OctetString::length().
{ set_key(key.begin(), key.length()); }
void Botan::Keyed_Transform::set_key | ( | const byte | key[], |
size_t | length | ||
) | [inline, inherited] |
Set the symmetric key of this transform
key | contains the key material |
length | in bytes of key param |
Definition at line 163 of file transform.h.
{ if(!valid_keylength(length)) throw Invalid_Key_Length(name(), length); key_schedule(key, length); }
secure_vector<byte> Botan::Transform::start | ( | const std::vector< byte, Alloc > & | nonce | ) | [inline, inherited] |
Begin processing a message.
nonce | the per message nonce |
Definition at line 34 of file transform.h.
Referenced by botan_cipher_start().
{ return start(&nonce[0], nonce.size()); }
secure_vector<byte> Botan::Transform::start | ( | const byte | nonce[], |
size_t | nonce_len | ||
) | [inline, inherited] |
Begin processing a message.
nonce | the per message nonce |
nonce_len | length of nonce |
Definition at line 55 of file transform.h.
{ return start_raw(nonce, nonce_len); }
secure_vector<byte> Botan::Transform::start | ( | ) | [inline, inherited] |
Begin processing a message.
Definition at line 63 of file transform.h.
{ return start_raw(nullptr, 0); }
secure_vector<byte> Botan::Transform::start_vec | ( | const std::vector< byte, Alloc > & | nonce | ) | [inline, inherited] |
Begin processing a message.
nonce | the per message nonce |
Definition at line 45 of file transform.h.
{ return start(&nonce[0], nonce.size()); }
size_t Botan::ChaCha20Poly1305_Mode::tag_size | ( | ) | const [inline, override, virtual, inherited] |
Return the size of the authentication tag used (in bytes)
Reimplemented from Botan::Cipher_Mode.
Definition at line 37 of file chacha20poly1305.h.
Referenced by finish(), and Botan::ChaCha20Poly1305_Decryption::finish().
{ return 16; }
void Botan::ChaCha20Poly1305_Encryption::update | ( | secure_vector< byte > & | blocks, |
size_t | offset = 0 |
||
) | [override, virtual] |
Process some data. Input must be in size update_granularity() byte blocks.
blocks | in/out paramter which will possibly be resized |
offset | an offset into blocks to begin processing |
Implements Botan::Transform.
Definition at line 83 of file chacha20poly1305.cpp.
References BOTAN_ASSERT, Botan::ChaCha20Poly1305_Mode::m_chacha, Botan::ChaCha20Poly1305_Mode::m_ctext_len, and Botan::ChaCha20Poly1305_Mode::m_poly1305.
Referenced by finish().
{ BOTAN_ASSERT(buffer.size() >= offset, "Offset is sane"); const size_t sz = buffer.size() - offset; byte* buf = &buffer[offset]; m_chacha->cipher1(buf, sz); m_poly1305->update(buf, sz); // poly1305 of ciphertext m_ctext_len += sz; }
size_t Botan::ChaCha20Poly1305_Mode::update_granularity | ( | ) | const [inline, override, virtual, inherited] |
Implements Botan::Transform.
Definition at line 30 of file chacha20poly1305.h.
{ return 64; }
void Botan::ChaCha20Poly1305_Mode::update_len | ( | size_t | len | ) | [protected, inherited] |
Definition at line 43 of file chacha20poly1305.cpp.
References Botan::ChaCha20Poly1305_Mode::m_poly1305, and Botan::store_le().
Referenced by finish(), and Botan::ChaCha20Poly1305_Decryption::finish().
{ byte len8[8] = { 0 }; store_le(static_cast<u64bit>(len), len8); m_poly1305->update(len8, 8); }
bool Botan::Keyed_Transform::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 142 of file transform.h.
References Botan::Key_Length_Specification::valid_keylength().
{ return key_spec().valid_keylength(length); }
bool Botan::ChaCha20Poly1305_Mode::valid_nonce_length | ( | size_t | nonce_len | ) | const [override, virtual, inherited] |
Return true iff nonce_len is a valid length for the nonce
Implements Botan::Transform.
Definition at line 16 of file chacha20poly1305.cpp.
secure_vector<byte> Botan::ChaCha20Poly1305_Mode::m_ad [protected, inherited] |
Definition at line 44 of file chacha20poly1305.h.
Referenced by Botan::ChaCha20Poly1305_Mode::clear(), finish(), Botan::ChaCha20Poly1305_Decryption::finish(), and Botan::ChaCha20Poly1305_Mode::set_associated_data().
std::unique_ptr<StreamCipher> Botan::ChaCha20Poly1305_Mode::m_chacha [protected, inherited] |
Definition at line 41 of file chacha20poly1305.h.
Referenced by Botan::ChaCha20Poly1305_Mode::clear(), Botan::ChaCha20Poly1305_Decryption::finish(), update(), and Botan::ChaCha20Poly1305_Decryption::update().
size_t Botan::ChaCha20Poly1305_Mode::m_ctext_len = 0 [protected, inherited] |
Definition at line 46 of file chacha20poly1305.h.
Referenced by Botan::ChaCha20Poly1305_Mode::clear(), finish(), Botan::ChaCha20Poly1305_Decryption::finish(), Botan::ChaCha20Poly1305_Mode::set_associated_data(), update(), and Botan::ChaCha20Poly1305_Decryption::update().
size_t Botan::ChaCha20Poly1305_Mode::m_nonce_len = 0 [protected, inherited] |
Definition at line 45 of file chacha20poly1305.h.
std::unique_ptr<MessageAuthenticationCode> Botan::ChaCha20Poly1305_Mode::m_poly1305 [protected, inherited] |
Definition at line 42 of file chacha20poly1305.h.
Referenced by Botan::ChaCha20Poly1305_Mode::clear(), finish(), Botan::ChaCha20Poly1305_Decryption::finish(), update(), Botan::ChaCha20Poly1305_Decryption::update(), and Botan::ChaCha20Poly1305_Mode::update_len().