Botan 3.2.0
Crypto and TLS for C&
Public Member Functions | Static Public Member Functions | Protected Member Functions | List of all members
Botan::CTR_BE Class Referencefinal

#include <ctr.h>

Inheritance diagram for Botan::CTR_BE:
Botan::StreamCipher Botan::SymmetricAlgorithm

Public Member Functions

size_t buffer_size () const override
 
void cipher (const uint8_t in[], uint8_t out[], size_t len)
 
void cipher (std::span< const uint8_t > in, std::span< uint8_t > out)
 
void cipher1 (std::span< uint8_t > buf)
 
void cipher1 (uint8_t buf[], size_t len)
 
void clear () override
 
StreamCipherclone () const
 
 CTR_BE (std::unique_ptr< BlockCipher > cipher)
 
 CTR_BE (std::unique_ptr< BlockCipher > cipher, size_t ctr_size)
 
void decrypt (std::span< uint8_t > inout)
 
size_t default_iv_length () const override
 
void encipher (std::span< uint8_t > inout)
 
void encrypt (std::span< uint8_t > inout)
 
bool has_keying_material () const override
 
Key_Length_Specification key_spec () const override
 
template<concepts::resizable_byte_buffer T = secure_vector<uint8_t>>
T keystream_bytes (size_t bytes)
 
size_t maximum_keylength () const
 
size_t minimum_keylength () const
 
std::string name () const override
 
std::unique_ptr< StreamCiphernew_object () const override
 
virtual std::string provider () const
 
void seek (uint64_t offset) override
 
void set_iv (const uint8_t iv[], size_t iv_len)
 
void set_iv (std::span< const uint8_t > iv)
 
void set_key (const SymmetricKey &key)
 
void set_key (const uint8_t key[], size_t length)
 
void set_key (std::span< const uint8_t > key)
 
bool valid_iv_length (size_t iv_len) const override
 
bool valid_keylength (size_t length) const
 
void write_keystream (std::span< uint8_t > out)
 
void write_keystream (uint8_t out[], size_t len)
 

Static Public Member Functions

static std::unique_ptr< StreamCiphercreate (std::string_view algo_spec, std::string_view provider="")
 
static std::unique_ptr< StreamCiphercreate_or_throw (std::string_view algo_spec, std::string_view provider="")
 
static std::vector< std::string > providers (std::string_view algo_spec)
 

Protected Member Functions

void assert_key_material_set () const
 
void assert_key_material_set (bool predicate) const
 

Detailed Description

CTR-BE (Counter mode, big-endian)

Definition at line 19 of file ctr.h.

Constructor & Destructor Documentation

◆ CTR_BE() [1/2]

Botan::CTR_BE::CTR_BE ( std::unique_ptr< BlockCipher cipher)
explicit
Parameters
cipherthe block cipher to use

Definition at line 17 of file ctr.cpp.

17 :
18 m_cipher(std::move(cipher)),
19 m_block_size(m_cipher->block_size()),
20 m_ctr_size(m_block_size),
21 m_ctr_blocks(m_cipher->parallel_bytes() / m_block_size),
22 m_counter(m_cipher->parallel_bytes()),
23 m_pad(m_counter.size()),
24 m_pad_pos(0) {}
void cipher(const uint8_t in[], uint8_t out[], size_t len)

◆ CTR_BE() [2/2]

Botan::CTR_BE::CTR_BE ( std::unique_ptr< BlockCipher cipher,
size_t  ctr_size 
)

Definition at line 26 of file ctr.cpp.

26 :
27 m_cipher(std::move(cipher)),
28 m_block_size(m_cipher->block_size()),
29 m_ctr_size(ctr_size),
30 m_ctr_blocks(m_cipher->parallel_bytes() / m_block_size),
31 m_counter(m_cipher->parallel_bytes()),
32 m_pad(m_counter.size()),
33 m_pad_pos(0) {
34 BOTAN_ARG_CHECK(m_ctr_size >= 4 && m_ctr_size <= m_block_size, "Invalid CTR-BE counter size");
35}
#define BOTAN_ARG_CHECK(expr, msg)
Definition assert.h:29

References BOTAN_ARG_CHECK.

Member Function Documentation

◆ assert_key_material_set() [1/2]

void Botan::SymmetricAlgorithm::assert_key_material_set ( ) const
inlineprotectedinherited

Definition at line 139 of file sym_algo.h.

virtual bool has_keying_material() const =0
void assert_key_material_set() const
Definition sym_algo.h:139

References Botan::SymmetricAlgorithm::assert_key_material_set().

Referenced by Botan::SymmetricAlgorithm::assert_key_material_set(), Botan::Salsa20::cipher_bytes(), Botan::AES_128::decrypt_n(), Botan::AES_192::decrypt_n(), Botan::AES_256::decrypt_n(), Botan::ARIA_128::decrypt_n(), Botan::ARIA_192::decrypt_n(), Botan::ARIA_256::decrypt_n(), Botan::Blowfish::decrypt_n(), Botan::Camellia_128::decrypt_n(), Botan::Camellia_192::decrypt_n(), Botan::Camellia_256::decrypt_n(), Botan::CAST_128::decrypt_n(), Botan::DES::decrypt_n(), Botan::TripleDES::decrypt_n(), Botan::GOST_28147_89::decrypt_n(), Botan::IDEA::decrypt_n(), Botan::Kuznyechik::decrypt_n(), Botan::Lion::decrypt_n(), Botan::Noekeon::decrypt_n(), Botan::SEED::decrypt_n(), Botan::Serpent::decrypt_n(), Botan::SHACAL2::decrypt_n(), Botan::SM4::decrypt_n(), Botan::Threefish_512::decrypt_n(), Botan::Twofish::decrypt_n(), Botan::AES_128::encrypt_n(), Botan::AES_192::encrypt_n(), Botan::AES_256::encrypt_n(), Botan::ARIA_128::encrypt_n(), Botan::ARIA_192::encrypt_n(), Botan::ARIA_256::encrypt_n(), Botan::Blowfish::encrypt_n(), Botan::Camellia_128::encrypt_n(), Botan::Camellia_192::encrypt_n(), Botan::Camellia_256::encrypt_n(), Botan::CAST_128::encrypt_n(), Botan::DES::encrypt_n(), Botan::TripleDES::encrypt_n(), Botan::GOST_28147_89::encrypt_n(), Botan::IDEA::encrypt_n(), Botan::Kuznyechik::encrypt_n(), Botan::Lion::encrypt_n(), Botan::Noekeon::encrypt_n(), Botan::SEED::encrypt_n(), Botan::Serpent::encrypt_n(), Botan::SHACAL2::encrypt_n(), Botan::SM4::encrypt_n(), Botan::Threefish_512::encrypt_n(), Botan::Twofish::encrypt_n(), Botan::GHASH::final(), Botan::GHASH::ghash_update(), Botan::ChaCha::seek(), seek(), Botan::Salsa20::seek(), Botan::OCB_Mode::set_associated_data_n(), Botan::Salsa20::set_iv_bytes(), Botan::GHASH::update(), and Botan::GHASH::update_associated_data().

◆ assert_key_material_set() [2/2]

void Botan::SymmetricAlgorithm::assert_key_material_set ( bool  predicate) const
inlineprotectedinherited

Definition at line 141 of file sym_algo.h.

141 {
142 if(!predicate) {
143 throw_key_not_set_error();
144 }
145 }

◆ buffer_size()

size_t Botan::CTR_BE::buffer_size ( ) const
overridevirtual

Return the optimium buffer size to use with this cipher

Most stream ciphers internally produce blocks of bytes. This function returns that block size. Aligning buffer sizes to a multiple of this size may improve performance by reducing internal buffering overhead.

Note the return value of this function may change for any particular algorithm due to changes in the implementation from release to release, or changes in the runtime environment (such as CPUID indicating availability of an optimized implementation). It is not intrinsic to the algorithm; it is just a suggestion for gaining best performance.

Implements Botan::StreamCipher.

Definition at line 53 of file ctr.cpp.

53 {
54 return m_pad.size();
55}

◆ cipher() [1/2]

void Botan::StreamCipher::cipher ( const uint8_t  in[],
uint8_t  out[],
size_t  len 
)
inlineinherited

Encrypt or decrypt a message

Parameters
inthe plaintext
outthe byte array to hold the output, i.e. the ciphertext
lenthe length of both in and out in bytes

Definition at line 56 of file stream_cipher.h.

56{ cipher_bytes(in, out, len); }
virtual void cipher_bytes(const uint8_t in[], uint8_t out[], size_t len)=0

Referenced by Botan::StreamCipher::create(), Botan::Sodium::crypto_stream_salsa20_xor_ic(), and Botan::Sodium::crypto_stream_xsalsa20_xor_ic().

◆ cipher() [2/2]

void Botan::StreamCipher::cipher ( std::span< const uint8_t >  in,
std::span< uint8_t >  out 
)
inlineinherited

Encrypt or decrypt a message

Parameters
inthe plaintext
outthe byte array to hold the output, i.e. the ciphertext with at least the same size as in

Definition at line 64 of file stream_cipher.h.

64 {
65 BOTAN_ARG_CHECK(in.size() <= out.size(),
66 "Output buffer of stream cipher must be at least as long as input buffer");
67 cipher_bytes(in.data(), out.data(), in.size());
68 }

References BOTAN_ARG_CHECK.

◆ cipher1() [1/2]

void Botan::StreamCipher::cipher1 ( std::span< uint8_t >  buf)
inlineinherited

Encrypt or decrypt a message The message is encrypted/decrypted in place.

Parameters
bufthe plaintext / ciphertext

Definition at line 114 of file stream_cipher.h.

114{ cipher(buf, buf); }

◆ cipher1() [2/2]

void Botan::StreamCipher::cipher1 ( uint8_t  buf[],
size_t  len 
)
inlineinherited

Encrypt or decrypt a message The message is encrypted/decrypted in place.

Parameters
bufthe plaintext / ciphertext
lenthe length of buf in bytes

Definition at line 107 of file stream_cipher.h.

107{ cipher(buf, buf, len); }

◆ clear()

void Botan::CTR_BE::clear ( )
overridevirtual

Reset the internal state. This includes not just the key, but any partial message that may have been in process.

Implements Botan::SymmetricAlgorithm.

Definition at line 37 of file ctr.cpp.

37 {
38 m_cipher->clear();
39 zeroise(m_pad);
40 zeroise(m_counter);
41 zap(m_iv);
42 m_pad_pos = 0;
43}
void zeroise(std::vector< T, Alloc > &vec)
Definition secmem.h:108
void zap(std::vector< T, Alloc > &vec)
Definition secmem.h:117

References Botan::zap(), and Botan::zeroise().

◆ clone()

StreamCipher * Botan::StreamCipher::clone ( ) const
inlineinherited
Returns
a new object representing the same algorithm as *this

Definition at line 182 of file stream_cipher.h.

182{ return this->new_object().release(); }
virtual std::unique_ptr< StreamCipher > new_object() const =0

◆ create()

std::unique_ptr< StreamCipher > Botan::StreamCipher::create ( std::string_view  algo_spec,
std::string_view  provider = "" 
)
staticinherited

Create an instance based on a name If provider is empty then best available is chosen.

Parameters
algo_specalgorithm name
providerprovider implementation to use
Returns
a null pointer if the algo/provider combination cannot be found

Definition at line 39 of file stream_cipher.cpp.

39 {
40#if defined(BOTAN_HAS_SHAKE_CIPHER)
41 if(algo_spec == "SHAKE-128" || algo_spec == "SHAKE-128-XOF") {
42 if(provider.empty() || provider == "base") {
43 return std::make_unique<SHAKE_128_Cipher>();
44 }
45 }
46
47 if(algo_spec == "SHAKE-256" || algo_spec == "SHAKE-256-XOF") {
48 if(provider.empty() || provider == "base") {
49 return std::make_unique<SHAKE_256_Cipher>();
50 }
51 }
52#endif
53
54#if defined(BOTAN_HAS_CHACHA)
55 if(algo_spec == "ChaCha20") {
56 if(provider.empty() || provider == "base") {
57 return std::make_unique<ChaCha>(20);
58 }
59 }
60#endif
61
62#if defined(BOTAN_HAS_SALSA20)
63 if(algo_spec == "Salsa20") {
64 if(provider.empty() || provider == "base") {
65 return std::make_unique<Salsa20>();
66 }
67 }
68#endif
69
70 const SCAN_Name req(algo_spec);
71
72#if defined(BOTAN_HAS_CTR_BE)
73 if((req.algo_name() == "CTR-BE" || req.algo_name() == "CTR") && req.arg_count_between(1, 2)) {
74 if(provider.empty() || provider == "base") {
75 auto cipher = BlockCipher::create(req.arg(0));
76 if(cipher) {
77 size_t ctr_size = req.arg_as_integer(1, cipher->block_size());
78 return std::make_unique<CTR_BE>(std::move(cipher), ctr_size);
79 }
80 }
81 }
82#endif
83
84#if defined(BOTAN_HAS_CHACHA)
85 if(req.algo_name() == "ChaCha") {
86 if(provider.empty() || provider == "base") {
87 return std::make_unique<ChaCha>(req.arg_as_integer(0, 20));
88 }
89 }
90#endif
91
92#if defined(BOTAN_HAS_OFB)
93 if(req.algo_name() == "OFB" && req.arg_count() == 1) {
94 if(provider.empty() || provider == "base") {
95 if(auto cipher = BlockCipher::create(req.arg(0))) {
96 return std::make_unique<OFB>(std::move(cipher));
97 }
98 }
99 }
100#endif
101
102#if defined(BOTAN_HAS_RC4)
103
104 if(req.algo_name() == "RC4" || req.algo_name() == "ARC4" || req.algo_name() == "MARK-4") {
105 const size_t skip = (req.algo_name() == "MARK-4") ? 256 : req.arg_as_integer(0, 0);
106
107 if(provider.empty() || provider == "base") {
108 return std::make_unique<RC4>(skip);
109 }
110 }
111
112#endif
113
114 BOTAN_UNUSED(req);
116
117 return nullptr;
118}
#define BOTAN_UNUSED
Definition assert.h:118
static std::unique_ptr< BlockCipher > create(std::string_view algo_spec, std::string_view provider="")
virtual std::string provider() const

References Botan::SCAN_Name::algo_name(), Botan::SCAN_Name::arg(), Botan::SCAN_Name::arg_as_integer(), Botan::SCAN_Name::arg_count(), Botan::SCAN_Name::arg_count_between(), BOTAN_UNUSED, Botan::StreamCipher::cipher(), Botan::BlockCipher::create(), and Botan::StreamCipher::provider().

Referenced by Botan::Cipher_Mode::create(), Botan::BlockCipher::create(), and Botan::StreamCipher::create_or_throw().

◆ create_or_throw()

std::unique_ptr< StreamCipher > Botan::StreamCipher::create_or_throw ( std::string_view  algo_spec,
std::string_view  provider = "" 
)
staticinherited

Create an instance based on a name If provider is empty then best available is chosen.

Parameters
algo_specalgorithm name
providerprovider implementation to use Throws a Lookup_Error if the algo/provider combination cannot be found

Definition at line 121 of file stream_cipher.cpp.

121 {
122 if(auto sc = StreamCipher::create(algo, provider)) {
123 return sc;
124 }
125 throw Lookup_Error("Stream cipher", algo, provider);
126}
static std::unique_ptr< StreamCipher > create(std::string_view algo_spec, std::string_view provider="")

References Botan::StreamCipher::create(), and Botan::StreamCipher::provider().

Referenced by Botan::ChaCha_RNG::ChaCha_RNG(), Botan::ChaCha_RNG::ChaCha_RNG(), Botan::ChaCha_RNG::ChaCha_RNG(), Botan::ChaCha_RNG::ChaCha_RNG(), Botan::ChaCha_RNG::ChaCha_RNG(), Botan::Sodium::crypto_secretbox_detached(), Botan::Sodium::crypto_secretbox_open_detached(), Botan::Sodium::crypto_secretbox_xsalsa20poly1305(), Botan::Sodium::crypto_secretbox_xsalsa20poly1305_open(), Botan::Sodium::crypto_stream_chacha20(), Botan::Sodium::crypto_stream_chacha20_ietf(), Botan::Sodium::crypto_stream_chacha20_ietf_xor_ic(), Botan::Sodium::crypto_stream_chacha20_xor_ic(), Botan::Sodium::crypto_stream_xchacha20(), and Botan::Sodium::crypto_stream_xchacha20_xor_ic().

◆ decrypt()

void Botan::StreamCipher::decrypt ( std::span< uint8_t >  inout)
inlineinherited

Decrypt a message in place The message is decrypted in place.

Parameters
inoutthe plaintext / ciphertext

Definition at line 135 of file stream_cipher.h.

135{ cipher(inout.data(), inout.data(), inout.size()); }

◆ default_iv_length()

size_t Botan::CTR_BE::default_iv_length ( ) const
overridevirtual

Return the default (preferred) nonce length If this function returns 0, then this cipher does not support nonces

Default implementation returns 0

Reimplemented from Botan::StreamCipher.

Definition at line 45 of file ctr.cpp.

45 {
46 return m_block_size;
47}

◆ encipher()

void Botan::StreamCipher::encipher ( std::span< uint8_t >  inout)
inlineinherited

Encrypt a message The message is encrypted/decrypted in place.

Parameters
inoutthe plaintext / ciphertext

Definition at line 121 of file stream_cipher.h.

121{ cipher(inout.data(), inout.data(), inout.size()); }

◆ encrypt()

void Botan::StreamCipher::encrypt ( std::span< uint8_t >  inout)
inlineinherited

Encrypt a message The message is encrypted in place.

Parameters
inoutthe plaintext / ciphertext

Definition at line 128 of file stream_cipher.h.

128{ cipher(inout.data(), inout.data(), inout.size()); }

◆ has_keying_material()

bool Botan::CTR_BE::has_keying_material ( ) const
overridevirtual
Returns
true if a key has been set on this object

Implements Botan::SymmetricAlgorithm.

Definition at line 65 of file ctr.cpp.

65 {
66 return m_cipher->has_keying_material();
67}

◆ key_spec()

Key_Length_Specification Botan::CTR_BE::key_spec ( ) const
overridevirtual
Returns
object describing limits on key size

Implements Botan::SymmetricAlgorithm.

Definition at line 57 of file ctr.cpp.

57 {
58 return m_cipher->key_spec();
59}

◆ keystream_bytes()

template<concepts::resizable_byte_buffer T = secure_vector<uint8_t>>
T Botan::StreamCipher::keystream_bytes ( size_t  bytes)
inlineinherited

Get bytes from the keystream

Parameters
bytesThe number of bytes to be produced

Definition at line 95 of file stream_cipher.h.

95 {
96 T out(bytes);
97 write_keystream(out);
98 return out;
99 }
void write_keystream(uint8_t out[], size_t len)
FE_25519 T
Definition ge.cpp:34

References T.

◆ maximum_keylength()

size_t Botan::SymmetricAlgorithm::maximum_keylength ( ) const
inlineinherited
Returns
maximum allowed key length

Definition at line 95 of file sym_algo.h.

95{ return key_spec().maximum_keylength(); }
size_t maximum_keylength() const
Definition sym_algo.h:54
virtual Key_Length_Specification key_spec() const =0

◆ minimum_keylength()

size_t Botan::SymmetricAlgorithm::minimum_keylength ( ) const
inlineinherited
Returns
minimum allowed key length

Definition at line 100 of file sym_algo.h.

100{ return key_spec().minimum_keylength(); }
size_t minimum_keylength() const
Definition sym_algo.h:49

◆ name()

std::string Botan::CTR_BE::name ( ) const
overridevirtual
Returns
the algorithm name

Implements Botan::SymmetricAlgorithm.

Definition at line 76 of file ctr.cpp.

76 {
77 if(m_ctr_size == m_block_size) {
78 return fmt("CTR-BE({})", m_cipher->name());
79 } else {
80 return fmt("CTR-BE({},{})", m_cipher->name(), m_ctr_size);
81 }
82}
std::string fmt(std::string_view format, const T &... args)
Definition fmt.h:53

References Botan::fmt().

◆ new_object()

std::unique_ptr< StreamCipher > Botan::CTR_BE::new_object ( ) const
overridevirtual
Returns
new object representing the same algorithm as *this

Implements Botan::StreamCipher.

Definition at line 61 of file ctr.cpp.

61 {
62 return std::make_unique<CTR_BE>(m_cipher->new_object(), m_ctr_size);
63}

◆ provider()

virtual std::string Botan::StreamCipher::provider ( ) const
inlinevirtualinherited
Returns
provider information about this implementation. Default is "base", might also return "sse2", "avx2" or some other arbitrary string.

Reimplemented in Botan::ChaCha.

Definition at line 199 of file stream_cipher.h.

199{ return "base"; }

Referenced by Botan::StreamCipher::create(), and Botan::StreamCipher::create_or_throw().

◆ providers()

std::vector< std::string > Botan::StreamCipher::providers ( std::string_view  algo_spec)
staticinherited
Returns
list of available providers for this algorithm, empty if not available

Definition at line 128 of file stream_cipher.cpp.

128 {
129 return probe_providers_of<StreamCipher>(algo_spec);
130}

◆ seek()

void Botan::CTR_BE::seek ( uint64_t  offset)
overridevirtual

Set the offset and the state used later to generate the keystream

Parameters
offsetthe offset where we begin to generate the keystream

Implements Botan::StreamCipher.

Definition at line 208 of file ctr.cpp.

208 {
210
211 const uint64_t base_counter = m_ctr_blocks * (offset / m_counter.size());
212
213 zeroise(m_counter);
214 buffer_insert(m_counter, 0, m_iv);
215
216 const size_t BS = m_block_size;
217
218 // Set m_counter blocks to IV, IV + 1, ... IV + n
219
220 if(m_ctr_size == 4 && BS >= 8) {
221 const uint32_t low32 = load_be<uint32_t>(&m_counter[BS - 4], 0);
222
223 if(m_ctr_blocks >= 4 && is_power_of_2(m_ctr_blocks)) {
224 size_t written = 1;
225 while(written < m_ctr_blocks) {
226 copy_mem(&m_counter[written * BS], &m_counter[0], BS * written);
227 written *= 2;
228 }
229 } else {
230 for(size_t i = 1; i != m_ctr_blocks; ++i) {
231 copy_mem(&m_counter[i * BS], &m_counter[0], BS - 4);
232 }
233 }
234
235 for(size_t i = 1; i != m_ctr_blocks; ++i) {
236 const uint32_t c = static_cast<uint32_t>(low32 + i);
237 store_be(c, &m_counter[(BS - 4) + i * BS]);
238 }
239 } else {
240 // do everything sequentially:
241 for(size_t i = 1; i != m_ctr_blocks; ++i) {
242 buffer_insert(m_counter, i * BS, &m_counter[(i - 1) * BS], BS);
243
244 for(size_t j = 0; j != m_ctr_size; ++j) {
245 if(++m_counter[i * BS + (BS - 1 - j)]) {
246 break;
247 }
248 }
249 }
250 }
251
252 if(base_counter > 0) {
253 add_counter(base_counter);
254 }
255
256 m_cipher->encrypt_n(m_counter.data(), m_pad.data(), m_ctr_blocks);
257 m_pad_pos = offset % m_counter.size();
258}
constexpr bool is_power_of_2(T arg)
Definition bit_ops.h:45
size_t buffer_insert(std::vector< T, Alloc > &buf, size_t buf_offset, const T input[], size_t input_length)
Definition mem_ops.h:212
constexpr void copy_mem(T *out, const T *in, size_t n)
Definition mem_ops.h:120
constexpr uint32_t load_be< uint32_t >(const uint8_t in[], size_t off)
Definition loadstor.h:162
constexpr void store_be(uint16_t in, uint8_t out[2])
Definition loadstor.h:389

References Botan::SymmetricAlgorithm::assert_key_material_set(), Botan::buffer_insert(), Botan::copy_mem(), Botan::is_power_of_2(), Botan::load_be< uint32_t >(), Botan::store_be(), and Botan::zeroise().

◆ set_iv() [1/2]

void Botan::StreamCipher::set_iv ( const uint8_t  iv[],
size_t  iv_len 
)
inlineinherited

Resync the cipher using the IV

Parameters
ivthe initialization vector
iv_lenthe length of the IV in bytes

Definition at line 157 of file stream_cipher.h.

157{ set_iv_bytes(iv, iv_len); }
virtual void set_iv_bytes(const uint8_t iv[], size_t iv_len)=0

Referenced by Botan::Sodium::crypto_stream_salsa20(), Botan::Sodium::crypto_stream_salsa20_xor_ic(), Botan::Sodium::crypto_stream_xsalsa20(), Botan::Sodium::crypto_stream_xsalsa20_xor_ic(), Botan::Sodium::randombytes_buf_deterministic(), and Botan::SIV_Mode::set_ctr_iv().

◆ set_iv() [2/2]

void Botan::StreamCipher::set_iv ( std::span< const uint8_t >  iv)
inlineinherited

Resync the cipher using the IV

Parameters
ivthe initialization vector

Definition at line 163 of file stream_cipher.h.

163{ set_iv_bytes(iv.data(), iv.size()); }

◆ set_key() [1/3]

void Botan::SymmetricAlgorithm::set_key ( const SymmetricKey key)
inlineinherited

◆ set_key() [2/3]

void Botan::SymmetricAlgorithm::set_key ( const uint8_t  key[],
size_t  length 
)
inlineinherited

Set the symmetric key of this object.

Parameters
keythe to be set as a byte array.
lengthin bytes of key param

Definition at line 126 of file sym_algo.h.

126{ set_key(std::span{key, length}); }

References Botan::SymmetricAlgorithm::set_key().

Referenced by Botan::SymmetricAlgorithm::set_key().

◆ set_key() [3/3]

void Botan::SymmetricAlgorithm::set_key ( std::span< const uint8_t >  key)
inherited

Set the symmetric key of this object.

Parameters
keythe contiguous byte range to be set.

Definition at line 17 of file sym_algo.cpp.

17 {
18 if(!valid_keylength(key.size())) {
19 throw Invalid_Key_Length(name(), key.size());
20 }
21 key_schedule(key);
22}
bool valid_keylength(size_t length) const
Definition sym_algo.h:107
virtual std::string name() const =0

References Botan::SymmetricAlgorithm::name(), and Botan::SymmetricAlgorithm::valid_keylength().

◆ valid_iv_length()

bool Botan::CTR_BE::valid_iv_length ( size_t  iv_len) const
overridevirtual
Parameters
iv_lenthe length of the IV in bytes
Returns
if the length is valid for this algorithm

Reimplemented from Botan::StreamCipher.

Definition at line 49 of file ctr.cpp.

49 {
50 return (iv_len <= m_block_size);
51}

◆ valid_keylength()

bool Botan::SymmetricAlgorithm::valid_keylength ( size_t  length) const
inlineinherited

Check whether a given key length is valid for this algorithm.

Parameters
lengththe key length to be checked.
Returns
true if the key length is valid.

Definition at line 107 of file sym_algo.h.

107{ return key_spec().valid_keylength(length); }
bool valid_keylength(size_t length) const
Definition sym_algo.h:42

Referenced by Botan::SymmetricAlgorithm::set_key().

◆ write_keystream() [1/2]

void Botan::StreamCipher::write_keystream ( std::span< uint8_t >  out)
inlineinherited

Fill a given buffer with keystream bytes

The contents of out are ignored/overwritten

Parameters
outthe byte array to hold the keystream

Definition at line 87 of file stream_cipher.h.

87{ generate_keystream(out.data(), out.size()); }
virtual void generate_keystream(uint8_t out[], size_t len)

◆ write_keystream() [2/2]

void Botan::StreamCipher::write_keystream ( uint8_t  out[],
size_t  len 
)
inlineinherited

Write keystream bytes to a buffer

The contents of out are ignored/overwritten

Parameters
outthe byte array to hold the keystream
lenthe length of out in bytes

Definition at line 78 of file stream_cipher.h.

78{ generate_keystream(out, len); }

Referenced by Botan::Sodium::crypto_stream_salsa20(), Botan::Sodium::crypto_stream_xsalsa20(), and Botan::Sodium::randombytes_buf_deterministic().


The documentation for this class was generated from the following files: