69 lines
2.1 KiB
C++
69 lines
2.1 KiB
C++
void CryptData::SetKey30(bool Encrypt,SecPassword *Password,const wchar *PwdW,const byte *Salt)
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{
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byte AESKey[16],AESInit[16];
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bool Cached=false;
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for (uint I=0;I<ASIZE(KDF3Cache);I++)
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if (KDF3Cache[I].Pwd==*Password &&
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(Salt==NULL && !KDF3Cache[I].SaltPresent || Salt!=NULL &&
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KDF3Cache[I].SaltPresent && memcmp(KDF3Cache[I].Salt,Salt,SIZE_SALT30)==0))
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{
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memcpy(AESKey,KDF3Cache[I].Key,sizeof(AESKey));
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SecHideData(AESKey,sizeof(AESKey),false,false);
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memcpy(AESInit,KDF3Cache[I].Init,sizeof(AESInit));
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Cached=true;
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break;
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}
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if (!Cached)
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{
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byte RawPsw[2*MAXPASSWORD+SIZE_SALT30];
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WideToRaw(PwdW,RawPsw,ASIZE(RawPsw));
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size_t RawLength=2*wcslen(PwdW);
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if (Salt!=NULL)
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{
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memcpy(RawPsw+RawLength,Salt,SIZE_SALT30);
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RawLength+=SIZE_SALT30;
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}
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sha1_context c;
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sha1_init(&c);
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const uint HashRounds=0x40000;
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for (uint I=0;I<HashRounds;I++)
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{
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sha1_process_rar29( &c, RawPsw, RawLength );
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byte PswNum[3];
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PswNum[0]=(byte)I;
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PswNum[1]=(byte)(I>>8);
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PswNum[2]=(byte)(I>>16);
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sha1_process(&c, PswNum, 3);
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if (I%(HashRounds/16)==0)
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{
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sha1_context tempc=c;
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uint32 digest[5];
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sha1_done( &tempc, digest );
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AESInit[I/(HashRounds/16)]=(byte)digest[4];
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}
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}
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uint32 digest[5];
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sha1_done( &c, digest );
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for (uint I=0;I<4;I++)
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for (uint J=0;J<4;J++)
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AESKey[I*4+J]=(byte)(digest[I]>>(J*8));
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KDF3Cache[KDF3CachePos].Pwd=*Password;
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if ((KDF3Cache[KDF3CachePos].SaltPresent=(Salt!=NULL))==true)
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memcpy(KDF3Cache[KDF3CachePos].Salt,Salt,SIZE_SALT30);
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memcpy(KDF3Cache[KDF3CachePos].Key,AESKey,sizeof(AESKey));
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SecHideData(KDF3Cache[KDF3CachePos].Key,sizeof(KDF3Cache[KDF3CachePos].Key),true,false);
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memcpy(KDF3Cache[KDF3CachePos].Init,AESInit,sizeof(AESInit));
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KDF3CachePos=(KDF3CachePos+1)%ASIZE(KDF3Cache);
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cleandata(RawPsw,sizeof(RawPsw));
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}
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rin.Init(Encrypt, AESKey, 128, AESInit);
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cleandata(AESKey,sizeof(AESKey));
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cleandata(AESInit,sizeof(AESInit));
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}
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