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61 lines
2.0 KiB
61 lines
2.0 KiB
3 years ago
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#ifndef BZF_MD5_H
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#define BZF_MD5_H
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#include <cstring>
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#include <iostream>
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// a small class for calculating MD5 hashes of strings or byte arrays
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// it is not meant to be fast or secure
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//
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// usage: 1) feed it blocks of uchars with update()
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// 2) finalize()
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// 3) get hexdigest() string
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// or
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// MD5(std::string).hexdigest()
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//
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// assumes that char is 8 bit and int is 32 bit
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class MD5
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{
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public:
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typedef unsigned int size_type; // must be 32bit
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MD5();
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MD5(const std::string& text);
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void update(const unsigned char *buf, size_type length);
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void update(const char *buf, size_type length);
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MD5& finalize();
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std::string hexdigest() const;
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friend std::ostream& operator<<(std::ostream&, MD5 md5);
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private:
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void init();
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typedef unsigned char uint1; // 8bit
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typedef unsigned int uint4; // 32bit
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enum {blocksize = 64}; // VC6 won't eat a const static int here
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void transform(const uint1 block[blocksize]);
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static void decode(uint4 output[], const uint1 input[], size_type len);
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static void encode(uint1 output[], const uint4 input[], size_type len);
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bool finalized;
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uint1 buffer[blocksize]; // bytes that didn't fit in last 64 byte chunk
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uint4 count[2]; // 64bit counter for number of bits (lo, hi)
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uint4 state[4]; // digest so far
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uint1 digest[16]; // the result
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// low level logic operations
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static inline uint4 F(uint4 x, uint4 y, uint4 z);
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static inline uint4 G(uint4 x, uint4 y, uint4 z);
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static inline uint4 H(uint4 x, uint4 y, uint4 z);
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static inline uint4 I(uint4 x, uint4 y, uint4 z);
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static inline uint4 rotate_left(uint4 x, int n);
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static inline void FF(uint4 &a, uint4 b, uint4 c, uint4 d, uint4 x, uint4 s, uint4 ac);
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static inline void GG(uint4 &a, uint4 b, uint4 c, uint4 d, uint4 x, uint4 s, uint4 ac);
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static inline void HH(uint4 &a, uint4 b, uint4 c, uint4 d, uint4 x, uint4 s, uint4 ac);
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static inline void II(uint4 &a, uint4 b, uint4 c, uint4 d, uint4 x, uint4 s, uint4 ac);
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};
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std::string md5(const std::string str);
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#endif
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