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/*
* PK Operation Types
* (C) 2010,2015 Jack Lloyd
*
* Botan is released under the Simplified BSD License (see license.txt)
*/
#include <botan/internal/pk_ops_impl.h>
#include <botan/eme.h>
#include <botan/kdf.h>
#include <botan/emsa.h>
#include <botan/internal/bit_ops.h>
namespace Botan {
PK_Ops::Encryption_with_EME::Encryption_with_EME(const std::string& eme)
{
m_eme.reset(get_eme(eme));
if(!m_eme.get())
throw Algorithm_Not_Found(eme);
}
PK_Ops::Encryption_with_EME::~Encryption_with_EME() {}
size_t PK_Ops::Encryption_with_EME::max_input_bits() const
{
return m_eme->maximum_input_size(max_raw_input_bits());
}
secure_vector<byte> PK_Ops::Encryption_with_EME::encrypt(const byte msg[], size_t msg_len,
RandomNumberGenerator& rng)
{
const size_t max_raw = max_raw_input_bits();
const std::vector<byte> encoded = unlock(m_eme->encode(msg, msg_len, max_raw, rng));
if(8*(encoded.size() - 1) + high_bit(encoded[0]) > max_raw)
throw Exception("Input is too large to encrypt with this key");
return raw_encrypt(encoded.data(), encoded.size(), rng);
}
PK_Ops::Decryption_with_EME::Decryption_with_EME(const std::string& eme)
{
m_eme.reset(get_eme(eme));
if(!m_eme.get())
throw Algorithm_Not_Found(eme);
}
PK_Ops::Decryption_with_EME::~Decryption_with_EME() {}
size_t PK_Ops::Decryption_with_EME::max_input_bits() const
{
return m_eme->maximum_input_size(max_raw_input_bits());
}
secure_vector<byte> PK_Ops::Decryption_with_EME::decrypt(const byte msg[], size_t length)
{
return m_eme->decode(raw_decrypt(msg, length), max_raw_input_bits());
}
PK_Ops::Key_Agreement_with_KDF::Key_Agreement_with_KDF(const std::string& kdf)
{
if(kdf != "Raw")
m_kdf.reset(get_kdf(kdf));
}
PK_Ops::Key_Agreement_with_KDF::~Key_Agreement_with_KDF() {}
secure_vector<byte> PK_Ops::Key_Agreement_with_KDF::agree(size_t key_len,
const byte w[], size_t w_len,
const byte salt[], size_t salt_len)
{
secure_vector<byte> z = raw_agree(w, w_len);
if(m_kdf)
return m_kdf->derive_key(key_len, z, salt, salt_len);
return z;
}
PK_Ops::Signature_with_EMSA::Signature_with_EMSA(const std::string& emsa)
{
m_emsa.reset(get_emsa(emsa));
if(!m_emsa)
throw Algorithm_Not_Found(emsa);
}
PK_Ops::Signature_with_EMSA::~Signature_with_EMSA() {}
void PK_Ops::Signature_with_EMSA::update(const byte msg[], size_t msg_len)
{
m_emsa->update(msg, msg_len);
}
secure_vector<byte> PK_Ops::Signature_with_EMSA::sign(RandomNumberGenerator& rng)
{
const secure_vector<byte> msg = m_emsa->raw_data();
const auto padded = m_emsa->encoding_of(msg, this->max_input_bits(), rng);
return raw_sign(padded.data(), padded.size(), rng);
}
PK_Ops::Verification_with_EMSA::Verification_with_EMSA(const std::string& emsa)
{
m_emsa.reset(get_emsa(emsa));
if(!m_emsa)
throw Algorithm_Not_Found(emsa);
}
PK_Ops::Verification_with_EMSA::~Verification_with_EMSA() {}
void PK_Ops::Verification_with_EMSA::update(const byte msg[], size_t msg_len)
{
m_emsa->update(msg, msg_len);
}
bool PK_Ops::Verification_with_EMSA::is_valid_signature(const byte sig[], size_t sig_len)
{
const secure_vector<byte> msg = m_emsa->raw_data();
if(with_recovery())
{
secure_vector<byte> output_of_key = verify_mr(sig, sig_len);
return m_emsa->verify(output_of_key, msg, max_input_bits());
}
else
{
Null_RNG rng;
secure_vector<byte> encoded = m_emsa->encoding_of(msg, max_input_bits(), rng);
return verify(encoded.data(), encoded.size(), sig, sig_len);
}
}
void PK_Ops::KEM_Encryption_with_KDF::kem_encrypt(secure_vector<byte>& out_encapsulated_key,
secure_vector<byte>& out_shared_key,
size_t desired_shared_key_len,
Botan::RandomNumberGenerator& rng,
const uint8_t salt[],
size_t salt_len)
{
secure_vector<byte> raw_shared;
this->raw_kem_encrypt(out_encapsulated_key, raw_shared, rng);
out_shared_key = m_kdf->derive_key(desired_shared_key_len,
raw_shared.data(), raw_shared.size(),
salt, salt_len);
}
PK_Ops::KEM_Encryption_with_KDF::KEM_Encryption_with_KDF(const std::string& kdf)
{
m_kdf.reset(get_kdf(kdf));
}
PK_Ops::KEM_Encryption_with_KDF::~KEM_Encryption_with_KDF() {}
secure_vector<byte>
PK_Ops::KEM_Decryption_with_KDF::kem_decrypt(const byte encap_key[],
size_t len,
size_t desired_shared_key_len,
const uint8_t salt[],
size_t salt_len)
{
secure_vector<byte> raw_shared = this->raw_kem_decrypt(encap_key, len);
return m_kdf->derive_key(desired_shared_key_len,
raw_shared.data(), raw_shared.size(),
salt, salt_len);
}
PK_Ops::KEM_Decryption_with_KDF::KEM_Decryption_with_KDF(const std::string& kdf)
{
m_kdf.reset(get_kdf(kdf));
}
PK_Ops::KEM_Decryption_with_KDF::~KEM_Decryption_with_KDF() {}
}
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