136 lines
3.1 KiB
C++
136 lines
3.1 KiB
C++
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#include "rar.hpp"
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void HashValue::Init(HASH_TYPE Type)
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{
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HashValue::Type=Type;
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// Zero length data CRC32 is 0. It is important to set it when creating
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// headers with no following data like directories or symlinks.
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if (Type==HASH_RAR14 || Type==HASH_CRC32)
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CRC32=0;
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if (Type==HASH_BLAKE2)
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{
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// dd0e891776933f43c7d032b08a917e25741f8aa9a12c12e1cac8801500f2ca4f
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// is BLAKE2sp hash of empty data. We init the structure to this value,
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// so if we create a file or service header with no following data like
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// "file copy" or "symlink", we set the checksum to proper value avoiding
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// additional header type or size checks when extracting.
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static byte EmptyHash[32]={
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0xdd, 0x0e, 0x89, 0x17, 0x76, 0x93, 0x3f, 0x43,
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0xc7, 0xd0, 0x32, 0xb0, 0x8a, 0x91, 0x7e, 0x25,
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0x74, 0x1f, 0x8a, 0xa9, 0xa1, 0x2c, 0x12, 0xe1,
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0xca, 0xc8, 0x80, 0x15, 0x00, 0xf2, 0xca, 0x4f
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};
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memcpy(Digest,EmptyHash,sizeof(Digest));
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}
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}
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bool HashValue::operator == (const HashValue &cmp)
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{
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if (Type==HASH_NONE || cmp.Type==HASH_NONE)
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return true;
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if (Type==HASH_RAR14 && cmp.Type==HASH_RAR14 ||
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Type==HASH_CRC32 && cmp.Type==HASH_CRC32)
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return CRC32==cmp.CRC32;
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if (Type==HASH_BLAKE2 && cmp.Type==HASH_BLAKE2)
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return memcmp(Digest,cmp.Digest,sizeof(Digest))==0;
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return false;
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}
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DataHash::DataHash()
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{
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blake2ctx=NULL;
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HashType=HASH_NONE;
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#ifdef RAR_SMP
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ThPool=NULL;
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MaxThreads=0;
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#endif
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}
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DataHash::~DataHash()
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{
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#ifdef RAR_SMP
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DestroyThreadPool(ThPool);
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#endif
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cleandata(&CurCRC32, sizeof(CurCRC32));
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if (blake2ctx!=NULL)
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{
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cleandata(blake2ctx, sizeof(blake2sp_state));
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delete blake2ctx;
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}
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}
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void DataHash::Init(HASH_TYPE Type,uint MaxThreads)
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{
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if (blake2ctx==NULL)
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blake2ctx=new blake2sp_state;
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HashType=Type;
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if (Type==HASH_RAR14)
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CurCRC32=0;
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if (Type==HASH_CRC32)
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CurCRC32=0xffffffff; // Initial CRC32 value.
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if (Type==HASH_BLAKE2)
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blake2sp_init(blake2ctx);
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#ifdef RAR_SMP
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DataHash::MaxThreads=Min(MaxThreads,MaxHashThreads);
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#endif
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}
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void DataHash::Update(const void *Data,size_t DataSize)
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{
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#ifndef SFX_MODULE
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if (HashType==HASH_RAR14)
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CurCRC32=Checksum14((ushort)CurCRC32,Data,DataSize);
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#endif
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if (HashType==HASH_CRC32)
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CurCRC32=CRC32(CurCRC32,Data,DataSize);
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if (HashType==HASH_BLAKE2)
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{
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#ifdef RAR_SMP
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if (MaxThreads>1 && ThPool==NULL)
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ThPool=CreateThreadPool();
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blake2ctx->ThPool=ThPool;
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blake2ctx->MaxThreads=MaxThreads;
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#endif
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blake2sp_update( blake2ctx, (byte *)Data, DataSize);
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}
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}
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void DataHash::Result(HashValue *Result)
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{
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Result->Type=HashType;
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if (HashType==HASH_RAR14)
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Result->CRC32=CurCRC32;
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if (HashType==HASH_CRC32)
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Result->CRC32=CurCRC32^0xffffffff;
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if (HashType==HASH_BLAKE2)
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{
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// Preserve the original context, so we can continue hashing if necessary.
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blake2sp_state res=*blake2ctx;
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blake2sp_final(&res,Result->Digest);
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}
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}
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uint DataHash::GetCRC32()
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{
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return HashType==HASH_CRC32 ? CurCRC32^0xffffffff : 0;
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}
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bool DataHash::Cmp(HashValue *CmpValue,byte *Key)
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{
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HashValue Final;
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Result(&Final);
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if (Key!=NULL)
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ConvertHashToMAC(&Final,Key);
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return Final==*CmpValue;
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}
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