Hendrik Lipka / MD5

port of a small MD5 library (see http://www.zedwood.com/article/121/cpp-md5-function ). I have removed the stream functionality (saves about 10k flash and 8k RAM)

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md5.h@0:8561cc01127c, 2011-01-10 (annotated)

Committer:
hlipka
Date:
Mon Jan 10 20:58:56 2011 +0000
Revision:
0:8561cc01127c
initial version

Who changed what in which revision?

UserRevisionLine numberNew contents of line
hlipka 0:8561cc01127c 1 /* MD5
hlipka 0:8561cc01127c 2 converted to C++ class by Frank Thilo (thilo@unix-ag.org)
hlipka 0:8561cc01127c 3 for bzflag (http://www.bzflag.org)
hlipka 0:8561cc01127c 4
hlipka 0:8561cc01127c 5 based on:
hlipka 0:8561cc01127c 6
hlipka 0:8561cc01127c 7 md5.h and md5.c
hlipka 0:8561cc01127c 8 reference implementation of RFC 1321
hlipka 0:8561cc01127c 9
hlipka 0:8561cc01127c 10 Copyright (C) 1991-2, RSA Data Security, Inc. Created 1991. All
hlipka 0:8561cc01127c 11 rights reserved.
hlipka 0:8561cc01127c 12
hlipka 0:8561cc01127c 13 License to copy and use this software is granted provided that it
hlipka 0:8561cc01127c 14 is identified as the "RSA Data Security, Inc. MD5 Message-Digest
hlipka 0:8561cc01127c 15 Algorithm" in all material mentioning or referencing this software
hlipka 0:8561cc01127c 16 or this function.
hlipka 0:8561cc01127c 17
hlipka 0:8561cc01127c 18 License is also granted to make and use derivative works provided
hlipka 0:8561cc01127c 19 that such works are identified as "derived from the RSA Data
hlipka 0:8561cc01127c 20 Security, Inc. MD5 Message-Digest Algorithm" in all material
hlipka 0:8561cc01127c 21 mentioning or referencing the derived work.
hlipka 0:8561cc01127c 22
hlipka 0:8561cc01127c 23 RSA Data Security, Inc. makes no representations concerning either
hlipka 0:8561cc01127c 24 the merchantability of this software or the suitability of this
hlipka 0:8561cc01127c 25 software for any particular purpose. It is provided "as is"
hlipka 0:8561cc01127c 26 without express or implied warranty of any kind.
hlipka 0:8561cc01127c 27
hlipka 0:8561cc01127c 28 These notices must be retained in any copies of any part of this
hlipka 0:8561cc01127c 29 documentation and/or software.
hlipka 0:8561cc01127c 30
hlipka 0:8561cc01127c 31 */
hlipka 0:8561cc01127c 32
hlipka 0:8561cc01127c 33 #ifndef BZF_MD5_H
hlipka 0:8561cc01127c 34 #define BZF_MD5_H
hlipka 0:8561cc01127c 35
hlipka 0:8561cc01127c 36 #include <string>
hlipka 0:8561cc01127c 37
hlipka 0:8561cc01127c 38
hlipka 0:8561cc01127c 39 /** a small class for calculating MD5 hashes of strings or byte arrays
hlipka 0:8561cc01127c 40 it is not meant to be fast or secure
hlipka 0:8561cc01127c 41
hlipka 0:8561cc01127c 42 usage: 1) feed it blocks of uchars with update()
hlipka 0:8561cc01127c 43 2) finalize()
hlipka 0:8561cc01127c 44 3) get hexdigest() string
hlipka 0:8561cc01127c 45 or
hlipka 0:8561cc01127c 46 MD5(std::string).hexdigest()
hlipka 0:8561cc01127c 47
hlipka 0:8561cc01127c 48 assumes that char is 8 bit and int is 32 bit
hlipka 0:8561cc01127c 49 */
hlipka 0:8561cc01127c 50 class MD5
hlipka 0:8561cc01127c 51 {
hlipka 0:8561cc01127c 52 public:
hlipka 0:8561cc01127c 53 typedef unsigned int size_type; // must be 32bit
hlipka 0:8561cc01127c 54
hlipka 0:8561cc01127c 55 MD5();
hlipka 0:8561cc01127c 56 /**
hlipka 0:8561cc01127c 57 take string, hash it and finalize
hlipka 0:8561cc01127c 58 @param text the string to hash
hlipka 0:8561cc01127c 59 */
hlipka 0:8561cc01127c 60 MD5(const std::string& text);
hlipka 0:8561cc01127c 61 /**
hlipka 0:8561cc01127c 62 add text to hash
hlipka 0:8561cc01127c 63 @param buf the text to add to the hash
hlipka 0:8561cc01127c 64 @param text length
hlipka 0:8561cc01127c 65 */
hlipka 0:8561cc01127c 66 void update(const unsigned char *buf, size_type length);
hlipka 0:8561cc01127c 67 /**
hlipka 0:8561cc01127c 68 add text to hash
hlipka 0:8561cc01127c 69 @param buf the text to add to the hash
hlipka 0:8561cc01127c 70 @param text length
hlipka 0:8561cc01127c 71 */
hlipka 0:8561cc01127c 72 void update(const char *buf, size_type length);
hlipka 0:8561cc01127c 73 /**
hlipka 0:8561cc01127c 74 calculate the final hash value
hlipka 0:8561cc01127c 75 */
hlipka 0:8561cc01127c 76 MD5& finalize();
hlipka 0:8561cc01127c 77 /**
hlipka 0:8561cc01127c 78 @return the hash as hex string
hlipka 0:8561cc01127c 79 */
hlipka 0:8561cc01127c 80 std::string hexdigest() const;
hlipka 0:8561cc01127c 81
hlipka 0:8561cc01127c 82 private:
hlipka 0:8561cc01127c 83 void init();
hlipka 0:8561cc01127c 84 typedef unsigned char uint1; // 8bit
hlipka 0:8561cc01127c 85 typedef unsigned int uint4; // 32bit
hlipka 0:8561cc01127c 86 enum {blocksize = 64}; // VC6 won't eat a const static int here
hlipka 0:8561cc01127c 87
hlipka 0:8561cc01127c 88 void transform(const uint1 block[blocksize]);
hlipka 0:8561cc01127c 89 static void decode(uint4 output[], const uint1 input[], size_type len);
hlipka 0:8561cc01127c 90 static void encode(uint1 output[], const uint4 input[], size_type len);
hlipka 0:8561cc01127c 91
hlipka 0:8561cc01127c 92 bool finalized;
hlipka 0:8561cc01127c 93 uint1 buffer[blocksize]; // bytes that didn't fit in last 64 byte chunk
hlipka 0:8561cc01127c 94 uint4 count[2]; // 64bit counter for number of bits (lo, hi)
hlipka 0:8561cc01127c 95 uint4 state[4]; // digest so far
hlipka 0:8561cc01127c 96 uint1 digest[16]; // the result
hlipka 0:8561cc01127c 97
hlipka 0:8561cc01127c 98 // low level logic operations
hlipka 0:8561cc01127c 99 static inline uint4 F(uint4 x, uint4 y, uint4 z);
hlipka 0:8561cc01127c 100 static inline uint4 G(uint4 x, uint4 y, uint4 z);
hlipka 0:8561cc01127c 101 static inline uint4 H(uint4 x, uint4 y, uint4 z);
hlipka 0:8561cc01127c 102 static inline uint4 I(uint4 x, uint4 y, uint4 z);
hlipka 0:8561cc01127c 103 static inline uint4 rotate_left(uint4 x, int n);
hlipka 0:8561cc01127c 104 static inline void FF(uint4 &a, uint4 b, uint4 c, uint4 d, uint4 x, uint4 s, uint4 ac);
hlipka 0:8561cc01127c 105 static inline void GG(uint4 &a, uint4 b, uint4 c, uint4 d, uint4 x, uint4 s, uint4 ac);
hlipka 0:8561cc01127c 106 static inline void HH(uint4 &a, uint4 b, uint4 c, uint4 d, uint4 x, uint4 s, uint4 ac);
hlipka 0:8561cc01127c 107 static inline void II(uint4 &a, uint4 b, uint4 c, uint4 d, uint4 x, uint4 s, uint4 ac);
hlipka 0:8561cc01127c 108 };
hlipka 0:8561cc01127c 109
hlipka 0:8561cc01127c 110 std::string md5(const std::string str);
hlipka 0:8561cc01127c 111
hlipka 0:8561cc01127c 112 #endif