let me explain further
let's say our pass is abcde12345 , now we want to encrypt it, what the function we call from the AS file does is :
left shifts denotes a left bit rotation by s places; s varies for each operation. Addition denotes addition modulo 232.
MD5 processes a variable length message into a fixed-length output of 128 bits. The input message is broken up into chunks of 512-bit blocks; the message is padded so that its length is divisible by 512. The padding works as follows: first a single bit, 1, is appended to the end of the message. This is followed by as many zeros as are required to bring the length of the message up to 64 bits fewer than a multiple of 512. The remaining bits are filled up with a 64-bit integer representing the length of the original message. The message is always padded with at least a single 1-bit, such that if the message length is a multiple of 512 minus the 64 bits for the length representation (that is, length mod(512) = 448), a new block of 512 bits is added with a 1-bit followed by 447 0-bits followed by the 64 length.
The main MD5 algorithm operates on a 128-bit state, divided into four 32-bit words, denoted A, B, C and D. These are initialised to certain fixed constants. The main algorithm then operates on each 512-bit message block in turn, each block modifying the state. The processing of a message block consists of four similar stages, termed rounds; each round is composed of 16 similar operations based on a non-linear function F, modular addition, and left rotation. Figure 1 illustrates one operation within a round. There are four possible functions F, a different one is used in each round:
F(X,Y,Z) = (X\wedge{Y}) \vee (\neg{X} \wedge{Z})
G(X,Y,Z) = (X\wedge{Z}) \vee (Y \wedge \neg{Z})
H(X,Y,Z) = X \oplus Y \oplus Z
I(X,Y,Z) = Y \oplus (X \vee \neg{Z})
\oplus, \wedge, \vee, \neg denote the XOR, AND, OR and NOT operations respectively.
