https://modu-print.com/tags/%EC%95%94%ED%98%B8%ED%99%94/Hugoko-KRSat, 05 Aug 2023 08:47:32 +0900https://modu-print.com/posts/3879/Wed, 09 Jun 2021 13:29:00 +0900https://modu-print.com/posts/3879/C++ // Encryption ( 8 Byte ) void encipher( unsigned long const v, unsigned long const w, const unsigned long const k ) { register unsigned long y = v[0], z = v[1], sum = 0, delta = 0x9E3779B9, a = k[0], b = k[1], c = k[2], d = k[3], n = 8; while(n–>0) { sum += delta; y += (z << 4)+a ^ z+sum ^ (z >> 5)+b; z += (y << 4)+c ^ y+sum ^ (y >> 5)+d; } w[0] = y; w[1] = z; } // Decryption void decipher( unsigned long const v, unsigned long const w, const unsigned long const k ) { register unsigned long y = v[0], z = v[1], sum = 0, delta = 0x9E3779B9, a = k[0], b = k[1], c = k[2], d = k[3], n = 8; //sum = delta<<5;//, in general sum = delta * n / sum = delta n; while(n–>0) { z -= (y << 4)+c ^ y+sum ^ (y >> 5)+d; y -= (z << 4)+a ^ z+sum ^ (z >> 5)+b; sum -= delta; } w[0] = y; w[1] = z; } / * TEA_EncryptData / unsigned long TEA_EncryptData( char plainData, char encData, unsigned long size , unsigned long key ) { unsigned long dwPos = 0; for( unsigned long i = 0; i < size; i += 8 ) { encipher( (unsigned long)&plainData[i], (unsigned long)&encData[dwPos], key ); dwPos += 8; } return dwPos; } / * TEA_DecryptData / unsigned long TEA_DecryptData( char encData, char plainData, unsigned long size, unsigned long key ) { unsigned long dwPos = 0; for( unsigned long i = 0; i < size; i += 8 ) { decipher( (unsigned long*)&encData[i], (unsigned long*)&plainData[dwPos], key ); dwPos += 8; } return dwPos; }