今天在github上搜到了一个MD5的c++代码段,挺好用的,适合32位和64位的机器,在此感谢JieweiWei,该代码段在github的地址是:https://github.com/DamonHu/md5
GitOsc下载:http://git.oschina.net/DamonHoo/md5
MD5的C++用法
C++的头文件:
/** * @file md5.h * @The header file of md5. * @author Jiewei Wei * @mail weijieweijerry@163.com * @github https://github.com/JieweiWei * @data Oct 19 2014 * */ #ifndef MD5_H #define MD5_H /* Parameters of MD5. */ #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 /** * @Basic MD5 functions. * * @param there bit32. * * @return one bit32. */ #define F(x, y, z) (((x) & (y)) | ((~x) & (z))) #define G(x, y, z) (((x) & (z)) | ((y) & (~z))) #define H(x, y, z) ((x) ^ (y) ^ (z)) #define I(x, y, z) ((y) ^ ((x) | (~z))) /** * @Rotate Left. * * @param {num} the raw number. * * @param {n} rotate left n. * * @return the number after rotated left. */ #define ROTATELEFT(num, n) (((num) << (n)) | ((num) >> (32-(n)))) /** * @Transformations for rounds 1, 2, 3, and 4. */ #define FF(a, b, c, d, x, s, ac) { \ (a) += F ((b), (c), (d)) + (x) + ac; \ (a) = ROTATELEFT ((a), (s)); \ (a) += (b); \ } #define GG(a, b, c, d, x, s, ac) { \ (a) += G ((b), (c), (d)) + (x) + ac; \ (a) = ROTATELEFT ((a), (s)); \ (a) += (b); \ } #define HH(a, b, c, d, x, s, ac) { \ (a) += H ((b), (c), (d)) + (x) + ac; \ (a) = ROTATELEFT ((a), (s)); \ (a) += (b); \ } #define II(a, b, c, d, x, s, ac) { \ (a) += I ((b), (c), (d)) + (x) + ac; \ (a) = ROTATELEFT ((a), (s)); \ (a) += (b); \ } #include <string> #include <cstring> using std::string; /* Define of btye.*/ typedef unsigned char byte; /* Define of byte. */ typedef unsigned int bit32; class MD5 { public: /* Construct a MD5 object with a string. */ MD5(const string& message); /* Generate md5 digest. */ const byte* getDigest(); /* Convert digest to string value */ string toStr(); private: /* Initialization the md5 object, processing another message block, * and updating the context.*/ void init(const byte* input, size_t len); /* MD5 basic transformation. Transforms state based on block. */ void transform(const byte block[64]); /* Encodes input (usigned long) into output (byte). */ void encode(const bit32* input, byte* output, size_t length); /* Decodes input (byte) into output (usigned long). */ void decode(const byte* input, bit32* output, size_t length); private: /* Flag for mark whether calculate finished. */ bool finished; /* state (ABCD). */ bit32 state[4]; /* number of bits, low-order word first. */ bit32 count[2]; /* input buffer. */ byte buffer[64]; /* message digest. */ byte digest[16]; /* padding for calculate. */ static const byte PADDING[64]; /* Hex numbers. */ static const char HEX_NUMBERS[16]; }; #endif // MD5_H
C++的cpp文件:
/** * @file md5.cpp * @The implement of md5. * @author Jiewei Wei * @mail weijieweijerry@163.com * @github https://github.com/JieweiWei * @data Oct 19 2014 * */ #include "md5.h" /* Define the static member of MD5. */ const byte MD5::PADDING[64] = { 0x80 }; const char MD5::HEX_NUMBERS[16] = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f' }; /** * @Construct a MD5 object with a string. * * @param {message} the message will be transformed. * */ MD5::MD5(const string& message) { finished = false; /* Reset number of bits. */ count[0] = count[1] = 0; /* Initialization constants. */ state[0] = 0x67452301; state[1] = 0xefcdab89; state[2] = 0x98badcfe; state[3] = 0x10325476; /* Initialization the object according to message. */ init((const byte*)message.c_str(), message.length()); } /** * @Generate md5 digest. * * @return the message-digest. * */ const byte* MD5::getDigest() { if (!finished) { finished = true; byte bits[8]; bit32 oldState[4]; bit32 oldCount[2]; bit32 index, padLen; /* Save current state and count. */ memcpy(oldState, state, 16); memcpy(oldCount, count, 8); /* Save number of bits */ encode(count, bits, 8); /* Pad out to 56 mod 64. */ index = (bit32)((count[0] >> 3) & 0x3f); padLen = (index < 56) ? (56 - index) : (120 - index); init(PADDING, padLen); /* Append length (before padding) */ init(bits, 8); /* Store state in digest */ encode(state, digest, 16); /* Restore current state and count. */ memcpy(state, oldState, 16); memcpy(count, oldCount, 8); } return digest; } /** * @Initialization the md5 object, processing another message block, * and updating the context. * * @param {input} the input message. * * @param {len} the number btye of message. * */ void MD5::init(const byte* input, size_t len) { bit32 i, index, partLen; finished = false; /* Compute number of bytes mod 64 */ index = (bit32)((count[0] >> 3) & 0x3f); /* update number of bits */ if ((count[0] += ((bit32)len << 3)) < ((bit32)len << 3)) { ++count[1]; } count[1] += ((bit32)len >> 29); partLen = 64 - index; /* transform as many times as possible. */ if (len >= partLen) { memcpy(&buffer[index], input, partLen); transform(buffer); for (i = partLen; i + 63 < len; i += 64) { transform(&input[i]); } index = 0; } else { i = 0; } /* Buffer remaining input */ memcpy(&buffer[index], &input[i], len - i); } /** * @MD5 basic transformation. Transforms state based on block. * * @param {block} the message block. */ void MD5::transform(const byte block[64]) { bit32 a = state[0], b = state[1], c = state[2], d = state[3], x[16]; decode(block, x, 64); /* Round 1 */ 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); /* Round 2 */ 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); /* Round 3 */ 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); /* Round 4 */ 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); state[0] += a; state[1] += b; state[2] += c; state[3] += d; } /** * @Encodes input (unsigned long) into output (byte). * * @param {input} usigned long. * * @param {output} byte. * * @param {length} the length of input. * */ void MD5::encode(const bit32* input, byte* output, size_t length) { for (size_t i = 0, j = 0; j < length; ++i, j += 4) { output[j]= (byte)(input[i] & 0xff); output[j + 1] = (byte)((input[i] >> 8) & 0xff); output[j + 2] = (byte)((input[i] >> 16) & 0xff); output[j + 3] = (byte)((input[i] >> 24) & 0xff); } } /** * @Decodes input (byte) into output (usigned long). * * @param {input} bytes. * * @param {output} unsigned long. * * @param {length} the length of input. * */ void MD5::decode(const byte* input, bit32* output, size_t length) { for (size_t i = 0, j = 0; j < length; ++i, j += 4) { output[i] = ((bit32)input[j]) | (((bit32)input[j + 1]) << 8) | (((bit32)input[j + 2]) << 16) | (((bit32)input[j + 3]) << 24); } } /** * @Convert digest to string value. * * @return the hex string of digest. * */ string MD5::toStr() { const byte* digest_ = getDigest(); string str; str.reserve(16 << 1); for (size_t i = 0; i < 16; ++i) { int t = digest_[i]; int a = t / 16; int b = t % 16; str.append(1, HEX_NUMBERS[a]); str.append(1, HEX_NUMBERS[b]); } return str; }
C++的使用实例:
/** * @file test.cpp * @The test file of md5. * @author Jiewei Wei * @mail weijieweijerry@163.com * @github https://github.com/JieweiWei * @data Oct 19 2014 * */ #include <iostream> #include "md5.h" using std::cout; using std::endl; void printMD5(const string& message) { cout << "md5(\"" << message << "\") = " << MD5(message).toStr() << endl; } int main() { printMD5(""); printMD5("a"); printMD5("abc"); printMD5("message digest"); printMD5("abcdefghijklmnopqrstuvwxyz"); printMD5("ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz"); return 0; }
MD5的OC用法
查看这个文章:Objective-C MD5加密字符串
MD5的另外一种C++用法但是只适用于32位
查看这个文章:MD5填坑备忘
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