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/*
* PKCS #5 PBES1
* (C) 1999-2007 Jack Lloyd
*
* Distributed under the terms of the Botan license
*/
#include <botan/pbes1.h>
#include <botan/pbkdf1.h>
#include <botan/der_enc.h>
#include <botan/ber_dec.h>
#include <botan/lookup.h>
#include <algorithm>
namespace Botan {
/*
* Encrypt some bytes using PBES1
*/
void PBE_PKCS5v15::write(const byte input[], size_t length)
{
m_pipe.write(input, length);
flush_pipe(true);
}
/*
* Start encrypting with PBES1
*/
void PBE_PKCS5v15::start_msg()
{
m_pipe.append(get_cipher(m_block_cipher->name() + "/CBC/PKCS7",
m_key, m_iv, m_direction));
m_pipe.start_msg();
if(m_pipe.message_count() > 1)
m_pipe.set_default_msg(m_pipe.default_msg() + 1);
}
/*
* Finish encrypting with PBES1
*/
void PBE_PKCS5v15::end_msg()
{
m_pipe.end_msg();
flush_pipe(false);
m_pipe.reset();
}
/*
* Flush the pipe
*/
void PBE_PKCS5v15::flush_pipe(bool safe_to_skip)
{
if(safe_to_skip && m_pipe.remaining() < 64)
return;
secure_vector<byte> buffer(DEFAULT_BUFFERSIZE);
while(m_pipe.remaining())
{
size_t got = m_pipe.read(&buffer[0], buffer.size());
send(buffer, got);
}
}
/*
* Encode PKCS#5 PBES1 parameters
*/
std::vector<byte> PBE_PKCS5v15::encode_params() const
{
return DER_Encoder()
.start_cons(SEQUENCE)
.encode(m_salt, OCTET_STRING)
.encode(m_iterations)
.end_cons()
.get_contents_unlocked();
}
/*
* Return an OID for this PBES1 type
*/
OID PBE_PKCS5v15::get_oid() const
{
const OID base_pbes1_oid("1.2.840.113549.1.5");
const std::string cipher = m_block_cipher->name();
const std::string digest = m_hash_function->name();
if(cipher == "DES" && digest == "MD2")
return (base_pbes1_oid + 1);
else if(cipher == "DES" && digest == "MD5")
return (base_pbes1_oid + 3);
else if(cipher == "DES" && digest == "SHA-160")
return (base_pbes1_oid + 10);
else if(cipher == "RC2" && digest == "MD2")
return (base_pbes1_oid + 4);
else if(cipher == "RC2" && digest == "MD5")
return (base_pbes1_oid + 6);
else if(cipher == "RC2" && digest == "SHA-160")
return (base_pbes1_oid + 11);
else
throw Internal_Error("PBE-PKCS5 v1.5: get_oid() has run out of options");
}
std::string PBE_PKCS5v15::name() const
{
return "PBE-PKCS5v15(" + m_block_cipher->name() + "," +
m_hash_function->name() + ")";
}
PBE_PKCS5v15::PBE_PKCS5v15(BlockCipher* cipher,
HashFunction* hash,
const std::string& passphrase,
std::chrono::milliseconds msec,
RandomNumberGenerator& rng) :
m_direction(ENCRYPTION),
m_block_cipher(cipher),
m_hash_function(hash),
m_salt(rng.random_vec(8))
{
if(cipher->name() != "DES" && cipher->name() != "RC2")
{
throw Invalid_Argument("PBE_PKCS5v1.5: Unknown cipher " +
cipher->name());
}
if(hash->name() != "MD2" && hash->name() != "MD5" &&
hash->name() != "SHA-160")
{
throw Invalid_Argument("PBE_PKCS5v1.5: Unknown hash " +
hash->name());
}
PKCS5_PBKDF1 pbkdf(m_hash_function->clone());
secure_vector<byte> key_and_iv =
pbkdf.derive_key(16, passphrase,
&m_salt[0], m_salt.size(),
msec, m_iterations).bits_of();
m_key.assign(&key_and_iv[0], &key_and_iv[8]);
m_iv.assign(&key_and_iv[8], &key_and_iv[16]);
}
PBE_PKCS5v15::PBE_PKCS5v15(BlockCipher* cipher,
HashFunction* hash,
const std::vector<byte>& params,
const std::string& passphrase) :
m_direction(DECRYPTION),
m_block_cipher(cipher),
m_hash_function(hash)
{
if(cipher->name() != "DES" && cipher->name() != "RC2")
{
throw Invalid_Argument("PBE_PKCS5v1.5: Unknown cipher " +
cipher->name());
}
if(hash->name() != "MD2" && hash->name() != "MD5" &&
hash->name() != "SHA-160")
{
throw Invalid_Argument("PBE_PKCS5v1.5: Unknown hash " +
hash->name());
}
BER_Decoder(params)
.start_cons(SEQUENCE)
.decode(m_salt, OCTET_STRING)
.decode(m_iterations)
.verify_end()
.end_cons();
if(m_salt.size() != 8)
throw Decoding_Error("PBES1: Encoded salt is not 8 octets");
PKCS5_PBKDF1 pbkdf(m_hash_function->clone());
secure_vector<byte> key_and_iv =
pbkdf.derive_key(16, passphrase,
&m_salt[0], m_salt.size(),
m_iterations).bits_of();
m_key.assign(&key_and_iv[0], &key_and_iv[8]);
m_iv.assign(&key_and_iv[8], &key_and_iv[16]);
}
PBE_PKCS5v15::~PBE_PKCS5v15()
{
delete m_block_cipher;
delete m_hash_function;
}
}
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