Botan
1.11.15
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#include <prf_x942.h>
Public Types | |
typedef SCAN_Name | Spec |
Public Member Functions | |
KDF * | clone () const |
secure_vector< byte > | derive_key (size_t key_len, const byte secret[], size_t secret_len, const byte salt[], size_t salt_len) const |
secure_vector< byte > | derive_key (size_t key_len, const secure_vector< byte > &secret, const std::string &salt="") const |
template<typename Alloc , typename Alloc2 > | |
secure_vector< byte > | derive_key (size_t key_len, const std::vector< byte, Alloc > &secret, const std::vector< byte, Alloc2 > &salt) const |
secure_vector< byte > | derive_key (size_t key_len, const secure_vector< byte > &secret, const byte salt[], size_t salt_len) const |
secure_vector< byte > | derive_key (size_t key_len, const byte secret[], size_t secret_len, const std::string &salt="") const |
size_t | kdf (byte key[], size_t key_len, const byte secret[], size_t secret_len, const byte salt[], size_t salt_len) const override |
std::string | name () const |
X942_PRF (const std::string &oid) |
PRF from ANSI X9.42
Definition at line 18 of file prf_x942.h.
typedef SCAN_Name Botan::KDF::Spec [inherited] |
Botan::X942_PRF::X942_PRF | ( | const std::string & | oid | ) |
Definition at line 85 of file prf_x942.cpp.
References Botan::OIDS::have_oid(), and Botan::OIDS::lookup().
{ if(OIDS::have_oid(oid)) m_key_wrap_oid = OIDS::lookup(oid).as_string(); else m_key_wrap_oid = oid; }
KDF* Botan::X942_PRF::clone | ( | ) | const [inline, virtual] |
Implements Botan::KDF.
Definition at line 23 of file prf_x942.h.
{ return new X942_PRF(m_key_wrap_oid); }
secure_vector<byte> Botan::KDF::derive_key | ( | size_t | key_len, |
const byte | secret[], | ||
size_t | secret_len, | ||
const byte | salt[], | ||
size_t | salt_len | ||
) | const [inline, inherited] |
Derive a key
key_len | the desired output length in bytes |
secret | the secret input |
secret_len | size of secret in bytes |
salt | a diversifier |
salt_len | size of salt in bytes |
Definition at line 41 of file kdf.h.
{ secure_vector<byte> key(key_len); key.resize(kdf(&key[0], key.size(), secret, secret_len, salt, salt_len)); return key; }
secure_vector<byte> Botan::KDF::derive_key | ( | size_t | key_len, |
const secure_vector< byte > & | secret, | ||
const std::string & | salt = "" |
||
) | const [inline, inherited] |
Derive a key
key_len | the desired output length in bytes |
secret | the secret input |
salt | a diversifier |
Definition at line 58 of file kdf.h.
{ return derive_key(key_len, &secret[0], secret.size(), reinterpret_cast<const byte*>(salt.data()), salt.length()); }
secure_vector<byte> Botan::KDF::derive_key | ( | size_t | key_len, |
const std::vector< byte, Alloc > & | secret, | ||
const std::vector< byte, Alloc2 > & | salt | ||
) | const [inline, inherited] |
Derive a key
key_len | the desired output length in bytes |
secret | the secret input |
salt | a diversifier |
Definition at line 74 of file kdf.h.
{ return derive_key(key_len, &secret[0], secret.size(), &salt[0], salt.size()); }
secure_vector<byte> Botan::KDF::derive_key | ( | size_t | key_len, |
const secure_vector< byte > & | secret, | ||
const byte | salt[], | ||
size_t | salt_len | ||
) | const [inline, inherited] |
Derive a key
key_len | the desired output length in bytes |
secret | the secret input |
salt | a diversifier |
salt_len | size of salt in bytes |
Definition at line 90 of file kdf.h.
{ return derive_key(key_len, &secret[0], secret.size(), salt, salt_len); }
secure_vector<byte> Botan::KDF::derive_key | ( | size_t | key_len, |
const byte | secret[], | ||
size_t | secret_len, | ||
const std::string & | salt = "" |
||
) | const [inline, inherited] |
Derive a key
key_len | the desired output length in bytes |
secret | the secret input |
secret_len | size of secret in bytes |
salt | a diversifier |
Definition at line 107 of file kdf.h.
{ return derive_key(key_len, secret, secret_len, reinterpret_cast<const byte*>(salt.data()), salt.length()); }
size_t Botan::X942_PRF::kdf | ( | byte | key[], |
size_t | key_len, | ||
const byte | secret[], | ||
size_t | secret_len, | ||
const byte | salt[], | ||
size_t | salt_len | ||
) | const [override, virtual] |
Implements Botan::KDF.
Definition at line 34 of file prf_x942.cpp.
References Botan::copy_mem(), Botan::PEM_Code::encode(), Botan::OCTET_STRING, and Botan::SEQUENCE.
{ std::unique_ptr<HashFunction> hash(make_a<HashFunction>("SHA-160")); const OID kek_algo(m_key_wrap_oid); secure_vector<byte> h; size_t offset = 0; u32bit counter = 1; while(offset != key_len && counter) { hash->update(secret, secret_len); hash->update( DER_Encoder().start_cons(SEQUENCE) .start_cons(SEQUENCE) .encode(kek_algo) .raw_bytes(encode_x942_int(counter)) .end_cons() .encode_if(salt_len != 0, DER_Encoder() .start_explicit(0) .encode(salt, salt_len, OCTET_STRING) .end_explicit() ) .start_explicit(2) .raw_bytes(encode_x942_int(static_cast<u32bit>(8 * key_len))) .end_explicit() .end_cons().get_contents() ); hash->final(h); const size_t copied = std::min(h.size(), key_len - offset); copy_mem(&key[offset], &h[0], copied); offset += copied; ++counter; } return offset; }
std::string Botan::X942_PRF::name | ( | ) | const [inline, virtual] |
Implements Botan::KDF.
Definition at line 21 of file prf_x942.h.
{ return "X942_PRF(" + m_key_wrap_oid + ")"; }