mirror of
https://github.com/shadps4-emu/ext-cryptopp.git
synced 2024-11-23 09:59:42 +00:00
265 lines
8.2 KiB
C++
265 lines
8.2 KiB
C++
// default.cpp - written and placed in the public domain by Wei Dai
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#include "pch.h"
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#include "default.h"
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#include "queue.h"
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#include <time.h>
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#include <memory>
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#if GCC_DIAGNOSTIC_AWARE
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# pragma GCC diagnostic ignored "-Wunused-value"
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# pragma GCC diagnostic ignored "-Wunused-variable"
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#endif
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NAMESPACE_BEGIN(CryptoPP)
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static const unsigned int MASH_ITERATIONS = 200;
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static const unsigned int SALTLENGTH = 8;
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static const unsigned int DIGESTSIZE = DefaultHashModule::DIGESTSIZE;
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static const unsigned int BLOCKSIZE = Default_BlockCipher::Encryption::BLOCKSIZE;
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static const unsigned int KEYLENGTH = Default_BlockCipher::Encryption::DEFAULT_KEYLENGTH;
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// The purpose of this function Mash() is to take an arbitrary length input
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// string and *deterministicly* produce an arbitrary length output string such
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// that (1) it looks random, (2) no information about the input is
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// deducible from it, and (3) it contains as much entropy as it can hold, or
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// the amount of entropy in the input string, whichever is smaller.
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static void Mash(const byte *in, size_t inLen, byte *out, size_t outLen, int iterations)
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{
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if (BytePrecision(outLen) > 2)
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throw InvalidArgument("Mash: output legnth too large");
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size_t bufSize = RoundUpToMultipleOf(outLen, (size_t)DIGESTSIZE);
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byte b[2];
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SecByteBlock buf(bufSize);
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SecByteBlock outBuf(bufSize);
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DefaultHashModule hash;
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unsigned int i;
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for(i=0; i<outLen; i+=DIGESTSIZE)
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{
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b[0] = (byte) (i >> 8);
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b[1] = (byte) i;
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hash.Update(b, 2);
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hash.Update(in, inLen);
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hash.Final(outBuf+i);
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}
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while (iterations-- > 1)
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{
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memcpy(buf, outBuf, bufSize);
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for (i=0; i<bufSize; i+=DIGESTSIZE)
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{
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b[0] = (byte) (i >> 8);
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b[1] = (byte) i;
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hash.Update(b, 2);
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hash.Update(buf, bufSize);
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hash.Final(outBuf+i);
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}
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}
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memcpy(out, outBuf, outLen);
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}
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static void GenerateKeyIV(const byte *passphrase, size_t passphraseLength, const byte *salt, size_t saltLength, byte *key, byte *IV)
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{
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SecByteBlock temp(passphraseLength+saltLength);
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memcpy(temp, passphrase, passphraseLength);
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memcpy(temp+passphraseLength, salt, saltLength);
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SecByteBlock keyIV(KEYLENGTH+BLOCKSIZE);
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Mash(temp, passphraseLength + saltLength, keyIV, KEYLENGTH+BLOCKSIZE, MASH_ITERATIONS);
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memcpy(key, keyIV, KEYLENGTH);
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memcpy(IV, keyIV+KEYLENGTH, BLOCKSIZE);
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}
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// ********************************************************
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DefaultEncryptor::DefaultEncryptor(const char *passphrase, BufferedTransformation *attachment)
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: ProxyFilter(NULL, 0, 0, attachment), m_passphrase((const byte *)passphrase, strlen(passphrase))
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{
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}
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DefaultEncryptor::DefaultEncryptor(const byte *passphrase, size_t passphraseLength, BufferedTransformation *attachment)
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: ProxyFilter(NULL, 0, 0, attachment), m_passphrase(passphrase, passphraseLength)
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{
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}
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void DefaultEncryptor::FirstPut(const byte *)
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{
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// VC60 workaround: __LINE__ expansion bug
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CRYPTOPP_COMPILE_ASSERT_INSTANCE(SALTLENGTH <= DIGESTSIZE, 1);
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CRYPTOPP_COMPILE_ASSERT_INSTANCE(BLOCKSIZE <= DIGESTSIZE, 2);
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SecByteBlock salt(DIGESTSIZE), keyCheck(DIGESTSIZE);
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DefaultHashModule hash;
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// use hash(passphrase | time | clock) as salt
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hash.Update(m_passphrase, m_passphrase.size());
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time_t t=time(0);
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hash.Update((byte *)&t, sizeof(t));
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clock_t c=clock();
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hash.Update((byte *)&c, sizeof(c));
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hash.Final(salt);
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// use hash(passphrase | salt) as key check
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hash.Update(m_passphrase, m_passphrase.size());
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hash.Update(salt, SALTLENGTH);
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hash.Final(keyCheck);
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AttachedTransformation()->Put(salt, SALTLENGTH);
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// mash passphrase and salt together into key and IV
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SecByteBlock key(KEYLENGTH);
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SecByteBlock IV(BLOCKSIZE);
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GenerateKeyIV(m_passphrase, m_passphrase.size(), salt, SALTLENGTH, key, IV);
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m_cipher.SetKeyWithIV(key, key.size(), IV);
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SetFilter(new StreamTransformationFilter(m_cipher));
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m_filter->Put(keyCheck, BLOCKSIZE);
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}
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void DefaultEncryptor::LastPut(const byte *inString, size_t length)
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{
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m_filter->MessageEnd();
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}
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// ********************************************************
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DefaultDecryptor::DefaultDecryptor(const char *p, BufferedTransformation *attachment, bool throwException)
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: ProxyFilter(NULL, SALTLENGTH+BLOCKSIZE, 0, attachment)
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, m_state(WAITING_FOR_KEYCHECK)
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, m_passphrase((const byte *)p, strlen(p))
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, m_throwException(throwException)
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{
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}
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DefaultDecryptor::DefaultDecryptor(const byte *passphrase, size_t passphraseLength, BufferedTransformation *attachment, bool throwException)
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: ProxyFilter(NULL, SALTLENGTH+BLOCKSIZE, 0, attachment)
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, m_state(WAITING_FOR_KEYCHECK)
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, m_passphrase(passphrase, passphraseLength)
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, m_throwException(throwException)
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{
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}
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void DefaultDecryptor::FirstPut(const byte *inString)
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{
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CheckKey(inString, inString+SALTLENGTH);
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}
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void DefaultDecryptor::LastPut(const byte *inString, size_t length)
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{
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if (m_filter.get() == NULL)
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{
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m_state = KEY_BAD;
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if (m_throwException)
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throw KeyBadErr();
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}
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else
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{
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m_filter->MessageEnd();
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m_state = WAITING_FOR_KEYCHECK;
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}
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}
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void DefaultDecryptor::CheckKey(const byte *salt, const byte *keyCheck)
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{
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SecByteBlock check(STDMAX((unsigned int)2*BLOCKSIZE, (unsigned int)DIGESTSIZE));
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DefaultHashModule hash;
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hash.Update(m_passphrase, m_passphrase.size());
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hash.Update(salt, SALTLENGTH);
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hash.Final(check);
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SecByteBlock key(KEYLENGTH);
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SecByteBlock IV(BLOCKSIZE);
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GenerateKeyIV(m_passphrase, m_passphrase.size(), salt, SALTLENGTH, key, IV);
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m_cipher.SetKeyWithIV(key, key.size(), IV);
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std::auto_ptr<StreamTransformationFilter> decryptor(new StreamTransformationFilter(m_cipher));
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decryptor->Put(keyCheck, BLOCKSIZE);
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decryptor->ForceNextPut();
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decryptor->Get(check+BLOCKSIZE, BLOCKSIZE);
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SetFilter(decryptor.release());
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if (!VerifyBufsEqual(check, check+BLOCKSIZE, BLOCKSIZE))
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{
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m_state = KEY_BAD;
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if (m_throwException)
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throw KeyBadErr();
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}
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else
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m_state = KEY_GOOD;
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}
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// ********************************************************
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static DefaultMAC * NewDefaultEncryptorMAC(const byte *passphrase, size_t passphraseLength)
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{
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size_t macKeyLength = DefaultMAC::StaticGetValidKeyLength(16);
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SecByteBlock macKey(macKeyLength);
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// since the MAC is encrypted there is no reason to mash the passphrase for many iterations
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Mash(passphrase, passphraseLength, macKey, macKeyLength, 1);
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return new DefaultMAC(macKey, macKeyLength);
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}
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DefaultEncryptorWithMAC::DefaultEncryptorWithMAC(const char *passphrase, BufferedTransformation *attachment)
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: ProxyFilter(NULL, 0, 0, attachment)
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, m_mac(NewDefaultEncryptorMAC((const byte *)passphrase, strlen(passphrase)))
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{
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SetFilter(new HashFilter(*m_mac, new DefaultEncryptor(passphrase), true));
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}
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DefaultEncryptorWithMAC::DefaultEncryptorWithMAC(const byte *passphrase, size_t passphraseLength, BufferedTransformation *attachment)
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: ProxyFilter(NULL, 0, 0, attachment)
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, m_mac(NewDefaultEncryptorMAC(passphrase, passphraseLength))
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{
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SetFilter(new HashFilter(*m_mac, new DefaultEncryptor(passphrase, passphraseLength), true));
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}
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void DefaultEncryptorWithMAC::LastPut(const byte *inString, size_t length)
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{
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m_filter->MessageEnd();
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}
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// ********************************************************
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DefaultDecryptorWithMAC::DefaultDecryptorWithMAC(const char *passphrase, BufferedTransformation *attachment, bool throwException)
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: ProxyFilter(NULL, 0, 0, attachment)
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, m_mac(NewDefaultEncryptorMAC((const byte *)passphrase, strlen(passphrase)))
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, m_throwException(throwException)
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{
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SetFilter(new DefaultDecryptor(passphrase, m_hashVerifier=new HashVerifier(*m_mac, NULL, HashVerifier::PUT_MESSAGE), throwException));
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}
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DefaultDecryptorWithMAC::DefaultDecryptorWithMAC(const byte *passphrase, size_t passphraseLength, BufferedTransformation *attachment, bool throwException)
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: ProxyFilter(NULL, 0, 0, attachment)
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, m_mac(NewDefaultEncryptorMAC(passphrase, passphraseLength))
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, m_throwException(throwException)
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{
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SetFilter(new DefaultDecryptor(passphrase, passphraseLength, m_hashVerifier=new HashVerifier(*m_mac, NULL, HashVerifier::PUT_MESSAGE), throwException));
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}
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DefaultDecryptor::State DefaultDecryptorWithMAC::CurrentState() const
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{
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return static_cast<const DefaultDecryptor *>(m_filter.get())->CurrentState();
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}
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bool DefaultDecryptorWithMAC::CheckLastMAC() const
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{
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return m_hashVerifier->GetLastResult();
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}
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void DefaultDecryptorWithMAC::LastPut(const byte *inString, size_t length)
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{
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m_filter->MessageEnd();
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if (m_throwException && !CheckLastMAC())
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throw MACBadErr();
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}
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NAMESPACE_END
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