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/*
* PBKDF1
* (C) 1999-2007 Jack Lloyd
*
* Distributed under the terms of the Botan license
*/
#include <botan/pbkdf1.h>
#include <botan/exceptn.h>
namespace Botan {
/*
* Return a PKCS#5 PBKDF1 derived key
*/
OctetString PKCS5_PBKDF1::derive_key(u32bit key_len,
const std::string& passphrase,
const byte salt[], u32bit salt_size,
u32bit iterations) const
{
if(iterations == 0)
throw Invalid_Argument("PKCS5_PBKDF1: Invalid iteration count");
if(key_len > hash->OUTPUT_LENGTH)
throw Invalid_Argument("PKCS5_PBKDF1: Requested output length too long");
hash->update(passphrase);
hash->update(salt, salt_size);
SecureVector<byte> key = hash->final();
for(u32bit j = 1; j != iterations; ++j)
{
hash->update(key);
hash->final(key);
}
return OctetString(key, std::min(key_len, key.size()));
}
/*
* Clone this type
*/
S2K* PKCS5_PBKDF1::clone() const
{
return new PKCS5_PBKDF1(hash->clone());
}
/*
* Return the name of this type
*/
std::string PKCS5_PBKDF1::name() const
{
return "PBKDF1(" + hash->name() + ")";
}
}
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