C/C++编程：MD5加密 港控/mmm° 2022-09-01 13:52 129阅读 0赞 # 实现 # // md5.h #ifndef SQUID_MD5_H #define SQUID_MD5_H #include <stdlib.h> typedef unsigned int uint32_t; typedef unsigned char uint8_t; typedef struct MD5Context { uint32_t buf[4]; uint32_t bytes[2]; uint32_t in[16]; } MD5_CTX; void MD5Init(struct MD5Context *context); void MD5Update(struct MD5Context *context, const void *buf, unsigned len); void MD5Final(uint8_t digest[16], struct MD5Context *context); void MD5Transform(uint32_t buf[4], uint32_t const in[16]); const char* MD5Key(const char *s, size_t s_len, const char *k, size_t k_len, void* buf, size_t b_len); const char* MD5String(const char *s, const char *k, size_t k_len, char* buf, size_t size); const char* MD5Key2String(const unsigned char *s, size_t s_len, char* buf, size_t size); #define MD5_DIGEST_CHARS 16 #endif /* SQUID_MD5_H */ // md5.cpp /* MS VisualStudio Projects are monolithic, so we need the following * #if to exclude the MD5 code from compile process when we are * building the SSL support. */ #include <assert.h> #include <stdio.h> #include "md5.h" #include <string.h> #ifdef WORDS_BIGENDIAN void byteSwap(uint32_t * buf, unsigned words) { uint8_t *p = (uint8_t *) buf; do { *buf++ = (uint32_t) ((unsigned) p[3] << 8 | p[2]) << 16 | ((unsigned) p[1] << 8 | p[0]); p += 4; } while (--words); } #else #define byteSwap(buf,words) #endif /* * Start MD5 accumulation. Set bit count to 0 and buffer to mysterious * initialization constants. */ void MD5Init(struct MD5Context *ctx) { ctx->buf[0] = 0x67452301; ctx->buf[1] = 0xefcdab89; ctx->buf[2] = 0x98badcfe; ctx->buf[3] = 0x10325476; ctx->bytes[0] = 0; ctx->bytes[1] = 0; } /* * Update context to reflect the concatenation of another buffer full * of bytes. */ void MD5Update(struct MD5Context *ctx, const void *_buf, unsigned len) { const uint8_t *buf = (const uint8_t *) _buf; uint32_t t; /* Update byte count */ t = ctx->bytes[0]; if ((ctx->bytes[0] = t + len) < t) ctx->bytes[1]++; /* Carry from low to high */ t = 64 - (t & 0x3f); /* Space available in ctx->in (at least 1) */ if (t > len) { memcpy((uint8_t *) ctx->in + 64 - t, buf, len); return; } /* First chunk is an odd size */ memcpy((uint8_t *) ctx->in + 64 - t, buf, t); byteSwap(ctx->in, 16); MD5Transform(ctx->buf, ctx->in); buf += t; len -= t; /* Process data in 64-byte chunks */ while (len >= 64) { memcpy(ctx->in, buf, 64); byteSwap(ctx->in, 16); MD5Transform(ctx->buf, ctx->in); buf += 64; len -= 64; } /* Handle any remaining bytes of data. */ memcpy(ctx->in, buf, len); } /* * Final wrapup - pad to 64-byte boundary with the bit pattern * 1 0* (64-bit count of bits processed, MSB-first) */ void MD5Final(unsigned char digest[16], struct MD5Context *ctx) { int count = ctx->bytes[0] & 0x3f; /* Number of bytes in ctx->in */ uint8_t *p = (uint8_t *) ctx->in + count; /* Set the first char of padding to 0x80. There is always room. */ *p++ = 0x80; /* Bytes of padding needed to make 56 bytes (-8..55) */ count = 56 - 1 - count; if (count < 0) { /* Padding forces an extra block */ memset(p, 0, count + 8); byteSwap(ctx->in, 16); MD5Transform(ctx->buf, ctx->in); p = (uint8_t *) ctx->in; count = 56; } memset(p, 0, count); byteSwap(ctx->in, 14); /* Append length in bits and transform */ ctx->in[14] = ctx->bytes[0] << 3; ctx->in[15] = ctx->bytes[1] << 3 | ctx->bytes[0] >> 29; MD5Transform(ctx->buf, ctx->in); byteSwap(ctx->buf, 4); memcpy(digest, ctx->buf, 16); memset(ctx, 0, sizeof(ctx)); /* In case it's sensitive */ } /* The four core functions - F1 is optimized somewhat */ /* #define F1(x, y, z) (x & y | ~x & z) */ #define F1(x, y, z) (z ^ (x & (y ^ z))) #define F2(x, y, z) F1(z, x, y) #define F3(x, y, z) (x ^ y ^ z) #define F4(x, y, z) (y ^ (x | ~z)) /* This is the central step in the MD5 algorithm. */ #define MD5STEP(f,w,x,y,z,in,s) \ (w += f(x,y,z) + in, w = (w<<s | w>>(32-s)) + x) /* * The core of the MD5 algorithm, this alters an existing MD5 hash to * reflect the addition of 16 longwords of new data. MD5Update blocks * the data and converts bytes into longwords for this routine. */ void MD5Transform(uint32_t buf[4], uint32_t const in[16]) { register uint32_t a, b, c, d; a = buf[0]; b = buf[1]; c = buf[2]; d = buf[3]; MD5STEP(F1, a, b, c, d, in[0] + 0xd76aa478, 7); MD5STEP(F1, d, a, b, c, in[1] + 0xe8c7b756, 12); MD5STEP(F1, c, d, a, b, in[2] + 0x242070db, 17); MD5STEP(F1, b, c, d, a, in[3] + 0xc1bdceee, 22); MD5STEP(F1, a, b, c, d, in[4] + 0xf57c0faf, 7); MD5STEP(F1, d, a, b, c, in[5] + 0x4787c62a, 12); MD5STEP(F1, c, d, a, b, in[6] + 0xa8304613, 17); MD5STEP(F1, b, c, d, a, in[7] + 0xfd469501, 22); MD5STEP(F1, a, b, c, d, in[8] + 0x698098d8, 7); MD5STEP(F1, d, a, b, c, in[9] + 0x8b44f7af, 12); MD5STEP(F1, c, d, a, b, in[10] + 0xffff5bb1, 17); MD5STEP(F1, b, c, d, a, in[11] + 0x895cd7be, 22); MD5STEP(F1, a, b, c, d, in[12] + 0x6b901122, 7); MD5STEP(F1, d, a, b, c, in[13] + 0xfd987193, 12); MD5STEP(F1, c, d, a, b, in[14] + 0xa679438e, 17); MD5STEP(F1, b, c, d, a, in[15] + 0x49b40821, 22); MD5STEP(F2, a, b, c, d, in[1] + 0xf61e2562, 5); MD5STEP(F2, d, a, b, c, in[6] + 0xc040b340, 9); MD5STEP(F2, c, d, a, b, in[11] + 0x265e5a51, 14); MD5STEP(F2, b, c, d, a, in[0] + 0xe9b6c7aa, 20); MD5STEP(F2, a, b, c, d, in[5] + 0xd62f105d, 5); MD5STEP(F2, d, a, b, c, in[10] + 0x02441453, 9); MD5STEP(F2, c, d, a, b, in[15] + 0xd8a1e681, 14); MD5STEP(F2, b, c, d, a, in[4] + 0xe7d3fbc8, 20); MD5STEP(F2, a, b, c, d, in[9] + 0x21e1cde6, 5); MD5STEP(F2, d, a, b, c, in[14] + 0xc33707d6, 9); MD5STEP(F2, c, d, a, b, in[3] + 0xf4d50d87, 14); MD5STEP(F2, b, c, d, a, in[8] + 0x455a14ed, 20); MD5STEP(F2, a, b, c, d, in[13] + 0xa9e3e905, 5); MD5STEP(F2, d, a, b, c, in[2] + 0xfcefa3f8, 9); MD5STEP(F2, c, d, a, b, in[7] + 0x676f02d9, 14); MD5STEP(F2, b, c, d, a, in[12] + 0x8d2a4c8a, 20); MD5STEP(F3, a, b, c, d, in[5] + 0xfffa3942, 4); MD5STEP(F3, d, a, b, c, in[8] + 0x8771f681, 11); MD5STEP(F3, c, d, a, b, in[11] + 0x6d9d6122, 16); MD5STEP(F3, b, c, d, a, in[14] + 0xfde5380c, 23); MD5STEP(F3, a, b, c, d, in[1] + 0xa4beea44, 4); MD5STEP(F3, d, a, b, c, in[4] + 0x4bdecfa9, 11); MD5STEP(F3, c, d, a, b, in[7] + 0xf6bb4b60, 16); MD5STEP(F3, b, c, d, a, in[10] + 0xbebfbc70, 23); MD5STEP(F3, a, b, c, d, in[13] + 0x289b7ec6, 4); MD5STEP(F3, d, a, b, c, in[0] + 0xeaa127fa, 11); MD5STEP(F3, c, d, a, b, in[3] + 0xd4ef3085, 16); MD5STEP(F3, b, c, d, a, in[6] + 0x04881d05, 23); MD5STEP(F3, a, b, c, d, in[9] + 0xd9d4d039, 4); MD5STEP(F3, d, a, b, c, in[12] + 0xe6db99e5, 11); MD5STEP(F3, c, d, a, b, in[15] + 0x1fa27cf8, 16); MD5STEP(F3, b, c, d, a, in[2] + 0xc4ac5665, 23); MD5STEP(F4, a, b, c, d, in[0] + 0xf4292244, 6); MD5STEP(F4, d, a, b, c, in[7] + 0x432aff97, 10); MD5STEP(F4, c, d, a, b, in[14] + 0xab9423a7, 15); MD5STEP(F4, b, c, d, a, in[5] + 0xfc93a039, 21); MD5STEP(F4, a, b, c, d, in[12] + 0x655b59c3, 6); MD5STEP(F4, d, a, b, c, in[3] + 0x8f0ccc92, 10); MD5STEP(F4, c, d, a, b, in[10] + 0xffeff47d, 15); MD5STEP(F4, b, c, d, a, in[1] + 0x85845dd1, 21); MD5STEP(F4, a, b, c, d, in[8] + 0x6fa87e4f, 6); MD5STEP(F4, d, a, b, c, in[15] + 0xfe2ce6e0, 10); MD5STEP(F4, c, d, a, b, in[6] + 0xa3014314, 15); MD5STEP(F4, b, c, d, a, in[13] + 0x4e0811a1, 21); MD5STEP(F4, a, b, c, d, in[4] + 0xf7537e82, 6); MD5STEP(F4, d, a, b, c, in[11] + 0xbd3af235, 10); MD5STEP(F4, c, d, a, b, in[2] + 0x2ad7d2bb, 15); MD5STEP(F4, b, c, d, a, in[9] + 0xeb86d391, 21); buf[0] += a; buf[1] += b; buf[2] += c; buf[3] += d; } const char* MD5Key(const char *s, size_t s_len, const char *k, size_t k_len, void* buf, size_t b_len) { MD5_CTX context; unsigned char digest[16]; if (b_len != 16) { printf("b_len(%d) != 16\n", b_len); assert(0); } MD5Init(&context); if (k != NULL && k_len > 0) MD5Update(&context, (const unsigned char *) k, k_len); MD5Update(&context, (const unsigned char*) s, s_len); MD5Final(digest, &context); memcpy(buf, digest, b_len); return ((const char*) buf); } const char* MD5String(const char *s, const char *k, size_t k_len, char* buf, size_t size) { MD5_CTX context; unsigned char digest[16]; char output1[34], *ptr; unsigned int len = (unsigned int) strlen(s); size_t i, n; MD5Init(&context); if (k != NULL && k_len > 0) MD5Update(&context, (const unsigned char *) k, k_len); MD5Update(&context, (const unsigned char*) s, len); MD5Final(digest, &context); for (i = 0; i < 16; i++) { sprintf(&(output1[2 * i]), "%02x", (unsigned char) digest[i]); sprintf(&(output1[2 * i + 1]), "%02x", (unsigned char) (digest[i] << 4)); } ptr = buf; size--; /* left one byte for '\0' */ n = size > 32 ? 32 : size; for(i = 0; i < n; i++) *ptr++ = output1[i]; *ptr = '\0'; return (buf); } const char* MD5Key2String(const unsigned char *s, size_t s_len, char* buf, size_t size) { size_t i, n; char output1[34], *ptr; unsigned char digest[16]; if (s_len != 16) { printf("s_len(%d) != 16\n", s_len); assert(0); } if (size < 32) { printf("size(%d) < 32\n", size); assert(0); } memcpy(digest, s, 16); for (i = 0; i < 16; i++) { sprintf(&(output1[2 * i]), "%02x", (unsigned char) digest[i]); sprintf(&(output1[2 * i + 1]), "%02x", (unsigned char) (digest[i] << 4)); } ptr = buf; size--; /* left one byte for '\0' */ n = size > 32 ? 32 : size; for(i = 0; i < n; i++) *ptr++ = output1[i]; *ptr = '\0'; return (buf); } # 使用 # ## 使用一 ## #include <stdio.h> #include <cstring> #include "md5.h" int main () { MD5_CTX md5; MD5Init(&md5); //初始化用于md5加密的结构 unsigned char encrypt[200] = { "hello"}; //存放于加密的信息 unsigned char decrypt[17]; //存放加密后的结果 MD5Update(&md5,encrypt,strlen((char *)encrypt)); //对欲加密的字符进行加密 MD5Final(decrypt,&md5); //获得最终结果 printf("加密前:%s\n加密后:",encrypt); for(int i=0;i<16;i++) printf("%2x",decrypt[i]); return 0; } ## 使用二 ## #include <stdio.h> #include <cstring> #include "md5.h" int main () { const char* s = "中国人民银行！"; const char* key = ""; char buf2[33]; MD5String(s, key, strlen(key), buf2, sizeof(buf2)); printf(" md5: %s\r\n", buf2); return 0; }
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港控/mmm°
喜欢ヅ旅行
红太狼
深藏阁楼爱情的钟
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