DES之symbian下的封装

/* * DesEncrypt.cpp * * Created on: 2010-4-28 * Author: Administrator */ #include "DesEncrypt.h" CDesEncrypt* CDesEncrypt::NewL() { CDesEncrypt* self = NewLC(); CleanupStack::Pop(self); return self; } CDesEncrypt* CDesEncrypt::NewLC() { CDesEncrypt* self = new (ELeave)CDesEncrypt; CleanupStack::PushL(self); self->ConstructL(); return self; } CDesEncrypt::~CDesEncrypt() { if(iKeyDes) { delete iKeyDes; iKeyDes = NULL; } if(iMingDes) { delete iMingDes; iMingDes = NULL; } if(iEncryptDes) { delete iEncryptDes; iEncryptDes = NULL; } if(iEncryptDesHex) { delete iEncryptDesHex; iEncryptDesHex = NULL; } if(iDESEncryptor) { delete iDESEncryptor; iDESEncryptor = NULL; } } HBufC8* CDesEncrypt::KeyDes() { return iKeyDes; } void CDesEncrypt::SetKeyDesL(const TDesC8& aKeyDes) { if(aKeyDes.Length() == 8)//密钥必须是8个字节的 { delete iKeyDes; iKeyDes = NULL; iKeyDes = aKeyDes.AllocL(); CreateDESEncryptorL(); } } HBufC8* CDesEncrypt::MingDes() { return iMingDes; } void CDesEncrypt::SetMingDesL(const TDesC8& aMingDes) { if(aMingDes.Length() > 0) { delete iMingDes; iMingDes = NULL; iMingDes = aMingDes.AllocL(); int len = iMingDes->Length(); int remain = len % 8; if(remain) { iMingDes = iMingDes->ReAllocL(iMingDes->Length() + 8 - remain); for (TInt i = 0 ;i < 8 - remain ; i++) { iMingDes->Des().Append(_L8(" ")); } } } } HBufC8* CDesEncrypt::EncryptDes() { return iEncryptDes; } void CDesEncrypt::SetEncryptDesL(const TDesC8& aEncryptDes) { delete iEncryptDes; iEncryptDes = NULL; iEncryptDes = aEncryptDes.AllocL(); } HBufC8* CDesEncrypt::EncryptDesHex() { return iEncryptDesHex; } void CDesEncrypt::SetEncryptDesHexL(const TDesC8& aEncryptDesHex) { delete iEncryptDesHex; iEncryptDesHex = NULL; iEncryptDesHex = aEncryptDesHex.AllocL(); } void CDesEncrypt::Encrypt() //加密 { if(iKeyDes->Length() == 8 && iMingDes->Length() > 0) { delete iEncryptDes; iEncryptDes =NULL;//清空iEncryptDes，保证没有上一个密文 int len = iMingDes->Length(); int pos = 0; while (pos < len) { TBuf8<8> buf; TPtrC8 part = iMingDes->Mid(pos,8); buf.Copy(part); iDESEncryptor->Transform(buf);//加密 if(iEncryptDes == NULL) { iEncryptDes = buf.AllocL(); } else { iEncryptDes = iEncryptDes->ReAllocL(iEncryptDes->Length() + buf.Length()); iEncryptDes->Des().Append(buf); } iDESEncryptor->Reset(); TInt patrlength = part.Length(); pos += patrlength; } //转换成iEncryptDesHex ChangeToEncryptDesHex(); } } void CDesEncrypt::ChangeToEncryptDesHex() //转换成iEncryptDesHex { TInt DSA = iEncryptDes->Length(); if(DSA > 0) { delete iEncryptDesHex; iEncryptDesHex = NULL; for(int i = 0; i < DSA; i++) { TBuf8<10> buf; TInt val = (*iEncryptDes)[i]; To16(val, buf); if(iEncryptDesHex == NULL) { iEncryptDesHex = buf.AllocL(); } else { iEncryptDesHex = iEncryptDesHex->ReAllocL(iEncryptDesHex->Length() + buf.Length()); iEncryptDesHex->Des().Append(buf); } } } } CDesEncrypt::CDesEncrypt() { } void CDesEncrypt::ConstructL() { } TChar CDesEncrypt::GetHex(TInt aVal) //根据余数返回对应的十六进制字符 { switch (aVal) { case 0: return TChar('0'); case 1: return TChar('1'); case 2: return TChar('2'); case 3: return TChar('3'); case 4: return TChar('4'); case 5: return TChar('5'); case 6: return TChar('6'); case 7: return TChar('7'); case 8: return TChar('8'); case 9: return TChar('9'); case 10: return TChar('a'); case 11: return TChar('b'); case 12: return TChar('c'); case 13: return TChar('d'); case 14: return TChar('e'); case 15: return TChar('f'); default: return TChar('0'); } } void CDesEncrypt::To16(TInt& val, TDes8& aDes)//将val装换成十六进制如："af", "04" { while(val) { TBuf8<16> buf; buf.Append(GetHex(val % 16)); aDes.Insert(0, buf); val /= 16; } if(aDes.Length() == 1) { aDes.Insert(0, _L8("0")); } } void CDesEncrypt::CreateDESEncryptorL() //只能在设置密钥时，调用该函数创建加密对象 { delete iDESEncryptor; iDESEncryptor = NULL; iDESEncryptor = CDESEncryptor::NewL(*iKeyDes,EFalse); }