转自:http://cooker.iteye.com/blog/969196
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- #ifndef BZF_MD5_H
- #define BZF_MD5_H
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- #include <string>
- #include <iostream>
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- class MD5
- {
- public:
- typedef unsigned int size_type;
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- MD5();
- MD5(const std::string& text);
- void update(const unsigned char *buf, size_type length);
- void update(const char *buf, size_type length);
- MD5& finalize();
- std::string hexdigest() const;
- friend std::ostream& operator<<(std::ostream&, MD5 md5);
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- private:
- void init();
- typedef unsigned char uint1;
- typedef unsigned int uint4;
- enum {blocksize = 64};
-
- void transform(const uint1 block[blocksize]);
- static void decode(uint4 output[], const uint1 input[], size_type len);
- static void encode(uint1 output[], const uint4 input[], size_type len);
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- bool finalized;
- uint1 buffer[blocksize];
- uint4 count[2];
- uint4 state[4];
- uint1 digest[16];
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- static inline uint4 F(uint4 x, uint4 y, uint4 z);
- static inline uint4 G(uint4 x, uint4 y, uint4 z);
- static inline uint4 H(uint4 x, uint4 y, uint4 z);
- static inline uint4 I(uint4 x, uint4 y, uint4 z);
- static inline uint4 rotate_left(uint4 x, int n);
- static inline void FF(uint4 &a, uint4 b, uint4 c, uint4 d, uint4 x, uint4 s, uint4 ac);
- static inline void GG(uint4 &a, uint4 b, uint4 c, uint4 d, uint4 x, uint4 s, uint4 ac);
- static inline void HH(uint4 &a, uint4 b, uint4 c, uint4 d, uint4 x, uint4 s, uint4 ac);
- static inline void II(uint4 &a, uint4 b, uint4 c, uint4 d, uint4 x, uint4 s, uint4 ac);
- };
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- std::string md5(const std::string str);
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- #endif
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- #include "md5.h"
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- #include <stdio.h>
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- #define S11 7
- #define S12 12
- #define S13 17
- #define S14 22
- #define S21 5
- #define S22 9
- #define S23 14
- #define S24 20
- #define S31 4
- #define S32 11
- #define S33 16
- #define S34 23
- #define S41 6
- #define S42 10
- #define S43 15
- #define S44 21
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- inline MD5::uint4 MD5::F(uint4 x, uint4 y, uint4 z) {
- return x&y | ~x&z;
- }
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- inline MD5::uint4 MD5::G(uint4 x, uint4 y, uint4 z) {
- return x&z | y&~z;
- }
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- inline MD5::uint4 MD5::H(uint4 x, uint4 y, uint4 z) {
- return x^y^z;
- }
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- inline MD5::uint4 MD5::I(uint4 x, uint4 y, uint4 z) {
- return y ^ (x | ~z);
- }
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- inline MD5::uint4 MD5::rotate_left(uint4 x, int n) {
- return (x << n) | (x >> (32-n));
- }
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- inline void MD5::FF(uint4 &a, uint4 b, uint4 c, uint4 d, uint4 x, uint4 s, uint4 ac) {
- a = rotate_left(a+ F(b,c,d) + x + ac, s) + b;
- }
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- inline void MD5::GG(uint4 &a, uint4 b, uint4 c, uint4 d, uint4 x, uint4 s, uint4 ac) {
- a = rotate_left(a + G(b,c,d) + x + ac, s) + b;
- }
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- inline void MD5::HH(uint4 &a, uint4 b, uint4 c, uint4 d, uint4 x, uint4 s, uint4 ac) {
- a = rotate_left(a + H(b,c,d) + x + ac, s) + b;
- }
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- inline void MD5::II(uint4 &a, uint4 b, uint4 c, uint4 d, uint4 x, uint4 s, uint4 ac) {
- a = rotate_left(a + I(b,c,d) + x + ac, s) + b;
- }
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- MD5::MD5()
- {
- init();
- }
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- MD5::MD5(const std::string &text)
- {
- init();
- update(text.c_str(), text.length());
- finalize();
- }
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- void MD5::init()
- {
- finalized=false;
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- count[0] = 0;
- count[1] = 0;
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- state[0] = 0x67452301;
- state[1] = 0xefcdab89;
- state[2] = 0x98badcfe;
- state[3] = 0x10325476;
- }
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- void MD5::decode(uint4 output[], const uint1 input[], size_type len)
- {
- for (unsigned int i = 0, j = 0; j < len; i++, j += 4)
- output[i] = ((uint4)input[j]) | (((uint4)input[j+1]) << 8) |
- (((uint4)input[j+2]) << 16) | (((uint4)input[j+3]) << 24);
- }
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- void MD5::encode(uint1 output[], const uint4 input[], size_type len)
- {
- for (size_type i = 0, j = 0; j < len; i++, j += 4) {
- output[j] = input[i] & 0xff;
- output[j+1] = (input[i] >> 8) & 0xff;
- output[j+2] = (input[i] >> 16) & 0xff;
- output[j+3] = (input[i] >> 24) & 0xff;
- }
- }
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- void MD5::transform(const uint1 block[blocksize])
- {
- uint4 a = state[0], b = state[1], c = state[2], d = state[3], x[16];
- decode (x, block, blocksize);
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- FF (a, b, c, d, x[ 0], S11, 0xd76aa478);
- FF (d, a, b, c, x[ 1], S12, 0xe8c7b756);
- FF (c, d, a, b, x[ 2], S13, 0x242070db);
- FF (b, c, d, a, x[ 3], S14, 0xc1bdceee);
- FF (a, b, c, d, x[ 4], S11, 0xf57c0faf);
- FF (d, a, b, c, x[ 5], S12, 0x4787c62a);
- FF (c, d, a, b, x[ 6], S13, 0xa8304613);
- FF (b, c, d, a, x[ 7], S14, 0xfd469501);
- FF (a, b, c, d, x[ 8], S11, 0x698098d8);
- FF (d, a, b, c, x[ 9], S12, 0x8b44f7af);
- FF (c, d, a, b, x[10], S13, 0xffff5bb1);
- FF (b, c, d, a, x[11], S14, 0x895cd7be);
- FF (a, b, c, d, x[12], S11, 0x6b901122);
- FF (d, a, b, c, x[13], S12, 0xfd987193);
- FF (c, d, a, b, x[14], S13, 0xa679438e);
- FF (b, c, d, a, x[15], S14, 0x49b40821);
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- GG (a, b, c, d, x[ 1], S21, 0xf61e2562);
- GG (d, a, b, c, x[ 6], S22, 0xc040b340);
- GG (c, d, a, b, x[11], S23, 0x265e5a51);
- GG (b, c, d, a, x[ 0], S24, 0xe9b6c7aa);
- GG (a, b, c, d, x[ 5], S21, 0xd62f105d);
- GG (d, a, b, c, x[10], S22, 0x2441453);
- GG (c, d, a, b, x[15], S23, 0xd8a1e681);
- GG (b, c, d, a, x[ 4], S24, 0xe7d3fbc8);
- GG (a, b, c, d, x[ 9], S21, 0x21e1cde6);
- GG (d, a, b, c, x[14], S22, 0xc33707d6);
- GG (c, d, a, b, x[ 3], S23, 0xf4d50d87);
- GG (b, c, d, a, x[ 8], S24, 0x455a14ed);
- GG (a, b, c, d, x[13], S21, 0xa9e3e905);
- GG (d, a, b, c, x[ 2], S22, 0xfcefa3f8);
- GG (c, d, a, b, x[ 7], S23, 0x676f02d9);
- GG (b, c, d, a, x[12], S24, 0x8d2a4c8a);
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- HH (a, b, c, d, x[ 5], S31, 0xfffa3942);
- HH (d, a, b, c, x[ 8], S32, 0x8771f681);
- HH (c, d, a, b, x[11], S33, 0x6d9d6122);
- HH (b, c, d, a, x[14], S34, 0xfde5380c);
- HH (a, b, c, d, x[ 1], S31, 0xa4beea44);
- HH (d, a, b, c, x[ 4], S32, 0x4bdecfa9);
- HH (c, d, a, b, x[ 7], S33, 0xf6bb4b60);
- HH (b, c, d, a, x[10], S34, 0xbebfbc70);
- HH (a, b, c, d, x[13], S31, 0x289b7ec6);
- HH (d, a, b, c, x[ 0], S32, 0xeaa127fa);
- HH (c, d, a, b, x[ 3], S33, 0xd4ef3085);
- HH (b, c, d, a, x[ 6], S34, 0x4881d05);
- HH (a, b, c, d, x[ 9], S31, 0xd9d4d039);
- HH (d, a, b, c, x[12], S32, 0xe6db99e5);
- HH (c, d, a, b, x[15], S33, 0x1fa27cf8);
- HH (b, c, d, a, x[ 2], S34, 0xc4ac5665);
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- II (a, b, c, d, x[ 0], S41, 0xf4292244);
- II (d, a, b, c, x[ 7], S42, 0x432aff97);
- II (c, d, a, b, x[14], S43, 0xab9423a7);
- II (b, c, d, a, x[ 5], S44, 0xfc93a039);
- II (a, b, c, d, x[12], S41, 0x655b59c3);
- II (d, a, b, c, x[ 3], S42, 0x8f0ccc92);
- II (c, d, a, b, x[10], S43, 0xffeff47d);
- II (b, c, d, a, x[ 1], S44, 0x85845dd1);
- II (a, b, c, d, x[ 8], S41, 0x6fa87e4f);
- II (d, a, b, c, x[15], S42, 0xfe2ce6e0);
- II (c, d, a, b, x[ 6], S43, 0xa3014314);
- II (b, c, d, a, x[13], S44, 0x4e0811a1);
- II (a, b, c, d, x[ 4], S41, 0xf7537e82);
- II (d, a, b, c, x[11], S42, 0xbd3af235);
- II (c, d, a, b, x[ 2], S43, 0x2ad7d2bb);
- II (b, c, d, a, x[ 9], S44, 0xeb86d391);
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- state[0] += a;
- state[1] += b;
- state[2] += c;
- state[3] += d;
-
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- memset(x, 0, sizeof x);
- }
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- void MD5::update(const unsigned char input[], size_type length)
- {
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- size_type index = count[0] / 8 % blocksize;
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- if ((count[0] += (length << 3)) < (length << 3))
- count[1]++;
- count[1] += (length >> 29);
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- size_type firstpart = 64 - index;
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- size_type i;
-
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- if (length >= firstpart)
- {
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- memcpy(&buffer[index], input, firstpart);
- transform(buffer);
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- for (i = firstpart; i + blocksize <= length; i += blocksize)
- transform(&input[i]);
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- index = 0;
- }
- else
- i = 0;
-
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- memcpy(&buffer[index], &input[i], length-i);
- }
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- void MD5::update(const char input[], size_type length)
- {
- update((const unsigned char*)input, length);
- }
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- MD5& MD5::finalize()
- {
- static unsigned char padding[64] = {
- 0x80, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
- 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
- 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
- };
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- if (!finalized) {
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- unsigned char bits[8];
- encode(bits, count, 8);
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- size_type index = count[0] / 8 % 64;
- size_type padLen = (index < 56) ? (56 - index) : (120 - index);
- update(padding, padLen);
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- update(bits, 8);
-
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- encode(digest, state, 16);
-
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- memset(buffer, 0, sizeof buffer);
- memset(count, 0, sizeof count);
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- finalized=true;
- }
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- return *this;
- }
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- std::string MD5::hexdigest() const
- {
- if (!finalized)
- return "";
-
- char buf[33];
- for (int i=0; i<16; i++)
- sprintf(buf+i*2, "%02x", digest[i]);
- buf[32]=0;
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- return std::string(buf);
- }
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- std::ostream& operator<<(std::ostream& out, MD5 md5)
- {
- return out << md5.hexdigest();
- }
-
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- std::string md5(const std::string str)
- {
- MD5 md5 = MD5(str);
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- return md5.hexdigest();
- }
- #include <iostream>
- #include "md5.h"
-
- using namespace std;
-
- int main(int argc, char *argv[])
- {
- cout << "md5 of 'grape': " << md5("grape")<<endl;
- return 0;
- }