#pragma once
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//
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// Created by Admin on 2022/9/24.
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//
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#ifndef CODEMD5_MD5_H
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#define CODEMD5_MD5_H
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/* Parameters of MD5. */
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#define s11 7
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#define s12 12
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#define s13 17
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#define s14 22
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#define s21 5
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#define s22 9
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#define s23 14
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#define s24 20
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#define s31 4
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#define s32 11
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#define s33 16
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#define s34 23
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#define s41 6
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#define s42 10
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#define s43 15
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#define s44 21
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#define F(x, y, z) (((x) & (y)) | ((~x) & (z)))
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#define G(x, y, z) (((x) & (z)) | ((y) & (~z)))
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#define H(x, y, z) ((x) ^ (y) ^ (z))
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#define I(x, y, z) ((y) ^ ((x) | (~z)))
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#define ROTATELEFT(num, n) (((num) << (n)) | ((num) >> (32-(n))))
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#define FF(a, b, c, d, x, s, ac) { \
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(a) += F ((b), (c), (d)) + (x) + ac; \
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(a) = ROTATELEFT ((a), (s)); \
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(a) += (b); \
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}
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#define GG(a, b, c, d, x, s, ac) { \
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(a) += G ((b), (c), (d)) + (x) + ac; \
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(a) = ROTATELEFT ((a), (s)); \
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(a) += (b); \
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}
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#define HH(a, b, c, d, x, s, ac) { \
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(a) += H ((b), (c), (d)) + (x) + ac; \
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(a) = ROTATELEFT ((a), (s)); \
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(a) += (b); \
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}
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#define II(a, b, c, d, x, s, ac) { \
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(a) += I ((b), (c), (d)) + (x) + ac; \
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(a) = ROTATELEFT ((a), (s)); \
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(a) += (b); \
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}
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#include <string>
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#include <cstring>
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using std::string;
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/* Define of btye.*/
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typedef unsigned char byte;
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/* Define of byte. */
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typedef unsigned int bit32;
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class MD5 {
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public:
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/* Construct a MD5 object with a string. */
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MD5(const string& message);
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/* Generate md5 digest. */
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const byte* getDigest();
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/* Convert digest to string value */
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string toStr();
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private:
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/* Initialization the md5 object, processing another message block,
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* and updating the context.*/
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void init(const byte* input, size_t len);
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/* MD5 basic transformation. Transforms state based on block. */
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void transform(const byte block[64]);
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/* Encodes input (usigned long) into output (byte). */
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void encode(const bit32* input, byte* output, size_t length);
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/* Decodes input (byte) into output (usigned long). */
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void decode(const byte* input, bit32* output, size_t length);
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private:
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/* Flag for mark whether calculate finished. */
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bool finished;
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/* state (ABCD). */
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bit32 state[4];
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/* number of bits, low-order word first. */
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bit32 count[2];
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/* input buffer. */
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byte buffer[64];
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/* message digest. */
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byte digest[16];
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/* padding for calculate. */
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static const byte PADDING[64];
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/* Hex numbers. */
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static const char HEX_NUMBERS[16];
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};
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#endif //CODEMD5_MD5_H
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