C语言MD5算法源码
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/*
* MD5C.C - RSA Data Security, Inc., MD5 message-digest algorithm
*/
#include <stdio.h>
#include <string.h>
void Data(const uchar *data, int len, uchar digest[16]);
char *HexString(const char *data, int len, char *buf);
static void Transform_64(const uchar x[64]);
static void Transform_16(const ulong x[16]);
static void Encode(uchar *output, const ulong *input, int len);
static void Decode(ulong *output, const uchar *input, int len);
static void Init(void);
static void Update(const uchar *input, int inputLen);
static void Final(uchar digest[16]);
ulong state[4]; /* state (ABCD) */
ulong count[2]; /* number of bits, modulo 2^64 (lsb first) */
uchar buffer[64]; /* input buffer */
/** F, G, H and I are basic MD5 functions. */
static ulong F(ulong x, ulong y, ulong z) {
return (((x) & (y)) | ((~x) & (z)));
}
static ulong G(ulong x, ulong y, ulong z) {
return (((x) & (z)) | ((y) & (~z)));
}
static ulong H(ulong x, ulong y, ulong z) {
return ((x) ^ (y) ^ (z));
}
static ulong I(ulong x, ulong y, ulong z) {
return ((y) ^ ((x) | (~z)));
}
/** ROTATE_LEFT rotates x left n bits. */
static ulong ROTATE_LEFT(ulong x, int n) {
return (((x) << (n)) | ((x) >> (32-(n))));
}
/** FF, GG, HH, and II transformations for rounds 1, 2, 3, and 4.
* Rotation is separate from addition to prevent recomputation.
*/
/*
static void FF(ulong &a, ulong b, ulong c, ulong d, ulong x, int s, ulong ac) {
(a) += F ((b), (c), (d)) + (x) + (ac);
(a) = ROTATE_LEFT ((a), (s));
(a) += (b);
}
static void GG(ulong &a, ulong b, ulong c, ulong d, ulong x, int s, ulong ac) {
(a) += G ((b), (c), (d)) + (x) + (ac);
(a) = ROTATE_LEFT ((a), (s));
(a) += (b);
}
static void HH(ulong &a, ulong b, ulong c, ulong d, ulong x, int s, ulong ac) {
(a) += H ((b), (c), (d)) + (x) + (ac);
(a) = ROTATE_LEFT ((a), (s));
(a) += (b);
}
static void II(ulong &a, ulong b, ulong c, ulong d, ulong x, int s, ulong ac) {
(a) += I ((b), (c), (d)) + (x) + (ac);
(a) = ROTATE_LEFT ((a), (s));
(a) += (b);
}
*/
#define FF(a, b, c, d, x, s, ac) \
(a) += F ((b), (c), (d)) + (x) + (ac);\
(a) = ROTATE_LEFT ((a), (s));\
(a) += (b);
#define GG(a, b, c, d, x, s, ac) \
(a) += G ((b), (c), (d)) + (x) + (ac);\
(a) = ROTATE_LEFT ((a), (s));\
(a) += (b);
#define HH(a, b, c, d, x, s, ac) \
(a) += H ((b), (c), (d)) + (x) + (ac);\
(a) = ROTATE_LEFT ((a), (s));\
(a) += (b);
#define II(a, b, c, d, x, s, ac) \
(a) += I ((b), (c), (d)) + (x) + (ac);\
(a) = ROTATE_LEFT ((a), (s));\
(a) += (b);
/*
* Constants for MD5Transform routine.
*/
const int S[4][4] = {
{ 7, 12, 17, 22,},
{ 5, 9, 14, 20,},
{ 4, 11, 16, 23,},
{ 6, 10, 15, 21,},
};
const ulong ac[64] = {
0xd76aa478l, 0xe8c7b756l, 0x242070dbl, 0xc1bdceeel,
0xf57c0fafl, 0x4787c62al, 0xa8304613l, 0xfd469501l,
0x698098d8l, 0x8b44f7afl, 0xffff5bb1l, 0x895cd7bel,
0x6b901122l, 0xfd987193l, 0xa679438el, 0x49b40821l,
0xf61e2562l, 0xc040b340l, 0x265e5a51l, 0xe9b6c7aal,
0xd62f105dl, 0x02441453l, 0xd8a1e681l, 0xe7d3fbc8l,
0x21e1cde6l, 0xc33707d6l, 0xf4d50d87l, 0x455a14edl,
0xa9e3e905l, 0xfcefa3f8l, 0x676f02d9l, 0x8d2a4c8al,
0xfffa3942l, 0x8771f681l, 0x6d9d6122l, 0xfde5380cl,
0xa4beea44l, 0x4bdecfa9l, 0xf6bb4b60l, 0xbebfbc70l,
0x289b7ec6l, 0xeaa127fal, 0xd4ef3085l, 0x04881d05l,
0xd9d4d039l, 0xe6db99e5l, 0x1fa27cf8l, 0xc4ac5665l,
0xf4292244l, 0x432aff97l, 0xab9423a7l, 0xfc93a039l,
0x655b59c3l, 0x8f0ccc92l, 0xffeff47dl, 0x85845dd1l,
0x6fa87e4fl, 0xfe2ce6e0l, 0xa3014314l, 0x4e0811a1l,
0xf7537e82l, 0xbd3af235l, 0x2ad7d2bbl, 0xeb86d391l,
};
const uchar 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
};
/*
* Encodes input (ulong) into output (uchar). Assumes len is a
* multiple of 4.
*/
void
Encode(uchar *output, const ulong *input, int len)
{
int i, j;
//assert((len % 4) == 0);
for (i = 0, j = 0; j < len; i++, j += 4) {
output[j] = (uchar) (input[i] & 0xff);
output[j + 1] = (uchar) ((input[i] >> 8) & 0xff);
output[j + 2] = (uchar) ((input[i] >> 16) & 0xff);
output[j + 3] = (uchar) ((input[i] >> 24) & 0xff);
}
}
/*
* Decodes input (uchar) into output (ulong). Assumes len is a
* multiple of 4.
*/
void
Decode(ulong *output, const uchar *input, int len)
{
int i, j;
for (i = 0, j = 0; j < len; i++, j += 4)
output[i] = ((ulong) input[j]) | (((ulong) input[j + 1]) << 8) |
(((ulong) input[j + 2]) << 16) | (((ulong) input[j + 3]) << 24);
}
/*
* MD5 basic transformation. Transforms state based on block.
*/
void
Transform_64(const uchar block[64])
{
ulong x[16];
Decode(x, block, 64);
Transform_16(x);
/** Zeroize sensitive information. */
//memset((uchar *) x, 0, sizeof(x));
}
void
Transform_16(const ulong x[16])
{
ulong a = state[0], b = state[1],
c = state[2], d = state[3];
/* Round 1 */
FF(a, b, c, d, x[ 0], S[0][0], 0xd76aa478l); /* 1 */
FF(d, a, b, c, x[ 1], S[0][1], 0xe8c7b756l); /* 2 */
FF(c, d, a, b, x[ 2], S[0][2], 0x242070dbl); /* 3 */
FF(b, c, d, a, x[ 3], S[0][3], 0xc1bdceeel); /* 4 */
FF(a, b, c, d, x[ 4], S[0][0], 0xf57c0fafl); /* 5 */
FF(d, a, b, c, x[ 5], S[0][1], 0x4787c62al); /* 6 */
FF(c, d, a, b, x[ 6], S[0][2], 0xa8304613l); /* 7 */
FF(b, c, d, a, x[ 7], S[0][3], 0xfd469501l); /* 8 */
FF(a, b, c, d, x[ 8], S[0][0], 0x698098d8l); /* 9 */
FF(d, a, b, c, x[ 9], S[0][1], 0x8b44f7afl); /* 10 */
FF(c, d, a, b, x[10], S[0][2], 0xffff5bb1l); /* 11 */
FF(b, c, d, a, x[11], S[0][3], 0x895cd7bel); /* 12 */
FF(a, b, c, d, x[12], S[0][0], 0x6b901122l); /* 13 */
FF(d, a, b, c, x[13], S[0][1], 0xfd987193l); /* 14 */
FF(c, d, a, b, x[14], S[0][2], 0xa679438el); /* 15 */
FF(b, c, d, a, x[15], S[0][3], 0x49b40821l); /* 16 */
/* Round 2 */
GG(a, b, c, d, x[ 1], S[1][0], 0xf61e2562l); /* 17 */
GG(d, a, b, c, x[ 6], S[1][1], 0xc040b340l); /* 18 */
GG(c, d, a, b, x[11], S[1][2], 0x265e5a51l); /* 19 */
GG(b, c, d, a, x[ 0], S[1][3], 0xe9b6c7aal); /* 20 */
GG(a, b, c, d, x[ 5], S[1][0], 0xd62f105dl); /* 21 */
GG(d, a, b, c, x[10], S[1][1], 0x02441453l); /* 22 */
GG(c, d, a, b, x[15], S[1][2], 0xd8a1e681l); /* 23 */
GG(b, c, d, a, x[ 4], S[1][3], 0xe7d3fbc8l); /* 24 */
GG(a, b, c, d, x[ 9], S[1][0], 0x21e1cde6l); /* 25 */
GG(d, a, b, c, x[14], S[1][1], 0xc33707d6l); /* 26 */
GG(c, d, a, b, x[ 3], S[1][2], 0xf4d50d87l); /* 27 */
GG(b, c, d, a, x[ 8], S[1][3], 0x455a14edl); /* 28 */
GG(a, b, c, d, x[13], S[1][0], 0xa9e3e905l); /* 29 */
GG(d, a, b, c, x[ 2], S[1][1], 0xfcefa3f8l); /* 30 */
GG(c, d, a, b, x[ 7], S[1][2], 0x676f02d9l); /* 31 */
GG(b, c, d, a, x[12], S[1][3], 0x8d2a4c8al); /* 32 */
/* Round 3 */
HH(a, b, c, d, x[ 5], S[2][0], 0xfffa3942l); /* 33 */
HH(d, a, b, c, x[ 8], S[2][1], 0x8771f681l); /* 34 */
HH(c, d, a, b, x[11], S[2][2], 0x6d9d6122l); /* 35 */
HH(b, c, d, a, x[14], S[2][3], 0xfde5380cl); /* 36 */
HH(a, b, c, d, x[ 1], S[2][0], 0xa4beea44l); /* 37 */
HH(d, a, b, c, x[ 4], S[2][1], 0x4bdecfa9l); /* 38 */
HH(c, d, a, b, x[ 7], S[2][2], 0xf6bb4b60l); /* 39 */
HH(b, c, d, a, x[10], S[2][3], 0xbebfbc70l); /* 40 */
HH(a, b, c, d, x[13], S[2][0], 0x289b7ec6l); /* 41 */
HH(d, a, b, c, x[ 0], S[2][1], 0xeaa127fal); /* 42 */
HH(c, d, a, b, x[ 3], S[2][2], 0xd4ef3085l); /* 43 */
HH(b, c, d, a, x[ 6], S[2][3], 0x04881d05l); /* 44 */
HH(a, b, c, d, x[ 9], S[2][0], 0xd9d4d039l); /* 45 */
HH(d, a, b, c, x[12], S[2][1], 0xe6db99e5l); /* 46 */
HH(c, d, a, b, x[15], S[2][2], 0x1fa27cf8l); /* 47 */
HH(b, c, d, a, x[ 2], S[2][3], 0xc4ac5665l); /* 48 */
/* Round 4 */
II(a, b, c, d, x[ 0], S[3][0], 0xf4292244l); /* 49 */
II(d, a, b, c, x[ 7], S[3][1], 0x432aff97l); /* 50 */
II(c, d, a, b, x[14], S[3][2], 0xab9423a7l); /* 51 */
II(b, c, d, a, x[ 5], S[3][3], 0xfc93a039l); /* 52 */
II(a, b, c, d, x[12], S[3][0], 0x655b59c3l); /* 53 */
II(d, a, b, c, x[ 3], S[3][1], 0x8f0ccc92l); /* 54 */
II(c, d, a, b, x[10], S[3][2], 0xffeff47dl); /* 55 */
II(b, c, d, a, x[ 1], S[3][3], 0x85845dd1l); /* 56 */
II(a, b, c, d, x[ 8], S[3][0], 0x6fa87e4fl); /* 57 */
II(d, a, b, c, x[15], S[3][1], 0xfe2ce6e0l); /* 58 */
II(c, d, a, b, x[ 6], S[3][2], 0xa3014314l); /* 59 */
II(b, c, d, a, x[13], S[3][3], 0x4e0811a1l); /* 60 */
II(a, b, c, d, x[ 4], S[3][0], 0xf7537e82l); /* 61 */
II(d, a, b, c, x[11], S[3][1], 0xbd3af235l); /* 62 */
II(c, d, a, b, x[ 2], S[3][2], 0x2ad7d2bbl); /* 63 */
II(b, c, d, a, x[ 9], S[3][3], 0xeb86d391l); /* 64 */
state[0] += a;
state[1] += b;
state[2] += c;
state[3] += d;
}
/**
* Initializes MD5 context for the start of message digest computation.
**/
void
Init()
{
count[0] = count[1] = 0;
/* Load magic initialization constants. */
state[0] = 0x67452301l;
state[1] = 0xefcdab89l;
state[2] = 0x98badcfel;
state[3] = 0x10325476l;
}
/**
* @input: pointer to data to be fed into MD5 algorithm.
* @inputLen: size of @input data in bytes.
*
* MD5 block update operation. Continues an MD5 message-digest operation,
* processing another message block, and updating the context.
**/
void
Update(const uchar *input, int inputLen)
{
int i, index, partLen;
/* Compute number of bytes mod 64 */
index = (unsigned int) ((count[0] >> 3) & 0x3F);
/* Update number of bits */
if ((count[0] += ((ulong) inputLen << 3)) < ((ulong) inputLen << 3)) {
count[1]++;
}
count[1] += ((ulong) inputLen >> 29);
partLen = 64 - index;
/* Transform as many times as possible. */
if (inputLen >= partLen) {
memcpy(&buffer[index], input, partLen);
Transform_64(buffer);
for (i = partLen; i + 63 < inputLen; i += 64) {
Transform_64(&input[i]);
}
index = 0;
} else {
i = 0;
}
/* Buffer remaining input */
if ((inputLen - i) != 0) {
memcpy(&buffer[index], &input[i], inputLen - i);
}
}
/**
* @digest: 16-byte buffer to write MD5 checksum.
*
* Ends an MD5 message-digest operation, writing the the message
* digest and zeroing the context. The context must be initialized
* with Init() before being used for other MD5 checksum calculations.
**/
void
Final(uchar digest[16])
{
uchar bits[8];
int index, padLen;
/* Save number of bits */
Encode(bits, count, 8);
/** Pad out to 56 mod 64. */
index =(int) ((count[0] >> 3) & 0x3f);
padLen = (index < 56) ? (56 - index) : (120 - index);
Update(PADDING, padLen);
/* Append length (before padding) */
Update(bits, 8);
/* Store state in digest */
Encode(digest, state, 16);
/** Zeroize sensitive information. */
//memset((uchar *)this, 0, sizeof(*this));
}
/**
* @data: pointer to data to be fed into MD5 algorithm.
* @len: size of @data in bytes.
* @digest: 16-byte buffer to write MD5 checksum.
*
* calculate the MD5 checksum.
**/
void
Data(const uchar *data, int len, uchar digest[16])
{
Init();
Update(data, len);
Final(digest);
}
char *
HexString(const char *data, int len, char *buf)
{
uchar digest[16];
Data((const uchar *)data, len, digest);
char *p = buf;
for (int i = 0; i < 16; i++) {
*p++ = "0123456789abcdef"[digest[i] >> 4];
*p++ = "0123456789abcdef"[digest[i] & 0x0f];
}
*p = 0;
return buf;
}
void test1(void)
{
char out[33];
char *str = "aaabcdefghabcdefghabcdefghabcdefghabcdefghabcdefghabcdefghabcdefgh";
//char *str = "abcdefghabcdefg";
//char *str = "a";
HexString(str, strlen(str), out);
//printf("%s\n", HexString(str, strlen(str), out));
while(1);
}
int main(int argc, char *argv[])
{
test1();
return 0;
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