Variables
value = 10000 //entier
value = "ABCD" //String
value = 0b10101010 //binaire
value = 0xffffffff //hexadecimal
value = b'ABC' //bytes
Conversion
Depuis Entier
value = (16).to_bytes(2, 'big') //bytes (ici 2 bytes big endian)
value = str( 16 ) //string
value = hex( 16 ) //hexadecimal
value = bin( 16 ) //binaire (string): 0b10000
value = "{0:08b}".format(16) //binaire (string): 00010000 (8bits)
Depuis Binaire
value = int("11000", 2); //entier
value = hex(int("11000", 2)); //hexadecimal
value = bytes.fromhex( hex( int("11000", 2) )[2:] )
//string (ASCII)
binary_int = int("11000010110001001100011", 2);
byte_number = binary_int.bit_length() + 7 // 8
binary_array = binary_int.to_bytes(byte_number, "big")
value = binary_array.decode()
Depuis Hexadécimal / Hexadécimal (String)
value = bytes.fromhex("ff") //bytes
value = bin( 0xff ) //binaire
value = int( 0xff ) //entier
value = int("eff01dhd", 16) //entier
Depuis String
value = bytes("ABC", 'utf-8') //bytes
value = hex( int("ff", 16) ) //hexadecimal (string)
value = int("55") //entier
Depuis Bytes
value = b'ABC'.decode("utf-8") //string
value = b'ABC'.hex() //hexadecimal
value = int(b'A'.hex(), 16) //entier
Table des opérations logiques bitwise (Python)
| A AND B | a & b |
| A OR B | a | b |
| A XOR B | a ^ b |
| NOT A | ~a |
| n-bit LEFT SHIFT A | a << n |
| n-bit RIGHT SHIFT A | a >> n |
| |
| A = A AND B | a &= b |
| A = A OR B | a |= b |
| A = A XOR B | a ^= b |
| A = n-bit LEFT SHIFT A | a <<= n |
| A = n-bit RIGHT SHIFT A | a >>= n |
XOR lambda for python
xor = lambda a,b: xor(b,a) if len(b)>len(a) else bytes([x^y for x,y in zip(a,b*(len(a)//len(b)+1))])
>>> xor(b'Attack at dawn!',b'key')
b'*\x11\r\n\x06\x12K\x04\rK\x01\x18\x1c\x0bX'
