src/core/ngx_md5.c - nginx - Git at Google


 /*
  * An internal implementation, based on Alexander Peslyak's
  * public domain implementation:
  * http://openwall.info/wiki/people/solar/software/public-domain-source-code/md5
  */


 #include <ngx_config.h>
 #include <ngx_core.h>
 #include <ngx_md5.h>


 static const u_char *ngx_md5_body(ngx_md5_t *ctx, const u_char *data,
     size_t size);


 void
 ngx_md5_init(ngx_md5_t *ctx)
 {
     ctx->a = 0x67452301;
     ctx->b = 0xefcdab89;
     ctx->c = 0x98badcfe;
     ctx->d = 0x10325476;

     ctx->bytes = 0;
 }


 void
 ngx_md5_update(ngx_md5_t *ctx, const void *data, size_t size)
 {
     size_t  used, free;

     used = (size_t) (ctx->bytes & 0x3f);
     ctx->bytes += size;

     if (used) {
         free = 64 - used;

         if (size < free) {
             ngx_memcpy(&ctx->buffer[used], data, size);
             return;
         }

         ngx_memcpy(&ctx->buffer[used], data, free);
         data = (u_char *) data + free;
         size -= free;
         (void) ngx_md5_body(ctx, ctx->buffer, 64);
     }

     if (size >= 64) {
         data = ngx_md5_body(ctx, data, size & ~(size_t) 0x3f);
         size &= 0x3f;
     }

     ngx_memcpy(ctx->buffer, data, size);
 }


 void
 ngx_md5_final(u_char result[16], ngx_md5_t *ctx)
 {
     size_t  used, free;

     used = (size_t) (ctx->bytes & 0x3f);

     ctx->buffer[used++] = 0x80;

     free = 64 - used;

     if (free < 8) {
         ngx_memzero(&ctx->buffer[used], free);
         (void) ngx_md5_body(ctx, ctx->buffer, 64);
         used = 0;
         free = 64;
     }

     ngx_memzero(&ctx->buffer[used], free - 8);

     ctx->bytes <<= 3;
     ctx->buffer[56] = (u_char) ctx->bytes;
     ctx->buffer[57] = (u_char) (ctx->bytes >> 8);
     ctx->buffer[58] = (u_char) (ctx->bytes >> 16);
     ctx->buffer[59] = (u_char) (ctx->bytes >> 24);
     ctx->buffer[60] = (u_char) (ctx->bytes >> 32);
     ctx->buffer[61] = (u_char) (ctx->bytes >> 40);
     ctx->buffer[62] = (u_char) (ctx->bytes >> 48);
     ctx->buffer[63] = (u_char) (ctx->bytes >> 56);

     (void) ngx_md5_body(ctx, ctx->buffer, 64);

     result[0] = (u_char) ctx->a;
     result[1] = (u_char) (ctx->a >> 8);
     result[2] = (u_char) (ctx->a >> 16);
     result[3] = (u_char) (ctx->a >> 24);
     result[4] = (u_char) ctx->b;
     result[5] = (u_char) (ctx->b >> 8);
     result[6] = (u_char) (ctx->b >> 16);
     result[7] = (u_char) (ctx->b >> 24);
     result[8] = (u_char) ctx->c;
     result[9] = (u_char) (ctx->c >> 8);
     result[10] = (u_char) (ctx->c >> 16);
     result[11] = (u_char) (ctx->c >> 24);
     result[12] = (u_char) ctx->d;
     result[13] = (u_char) (ctx->d >> 8);
     result[14] = (u_char) (ctx->d >> 16);
     result[15] = (u_char) (ctx->d >> 24);

     ngx_memzero(ctx, sizeof(*ctx));
 }


 /*
  * The basic MD5 functions.
  *
  * F and G are optimized compared to their RFC 1321 definitions for
  * architectures that lack an AND-NOT instruction, just like in
  * Colin Plumb's implementation.
  */

 #define F(x, y, z)  ((z) ^ ((x) & ((y) ^ (z))))
 #define G(x, y, z)  ((y) ^ ((z) & ((x) ^ (y))))
 #define H(x, y, z)  ((x) ^ (y) ^ (z))
 #define I(x, y, z)  ((y) ^ ((x) | ~(z)))

 /*
  * The MD5 transformation for all four rounds.
  */

 #define STEP(f, a, b, c, d, x, t, s)                                          \
     (a) += f((b), (c), (d)) + (x) + (t);                                      \
     (a) = (((a) << (s)) | (((a) & 0xffffffff) >> (32 - (s))));                \
     (a) += (b)

 /*
  * SET() reads 4 input bytes in little-endian byte order and stores them
  * in a properly aligned word in host byte order.
  *
  * The check for little-endian architectures that tolerate unaligned
  * memory accesses is just an optimization.  Nothing will break if it
  * does not work.
  */

 #if (NGX_HAVE_LITTLE_ENDIAN && NGX_HAVE_NONALIGNED)

 #define SET(n)      (*(uint32_t *) &p[n * 4])
 #define GET(n)      (*(uint32_t *) &p[n * 4])

 #else

 #define SET(n)                                                                \
     (block[n] =                                                               \
     (uint32_t) p[n * 4] |                                                     \
     ((uint32_t) p[n * 4 + 1] << 8) |                                          \
     ((uint32_t) p[n * 4 + 2] << 16) |                                         \
     ((uint32_t) p[n * 4 + 3] << 24))

 #define GET(n)      block[n]

 #endif


 /*
  * This processes one or more 64-byte data blocks, but does not update
  * the bit counters.  There are no alignment requirements.
  */

 static const u_char *
 ngx_md5_body(ngx_md5_t *ctx, const u_char *data, size_t size)
 {
     uint32_t       a, b, c, d;
     uint32_t       saved_a, saved_b, saved_c, saved_d;
     const u_char  *p;
 #if !(NGX_HAVE_LITTLE_ENDIAN && NGX_HAVE_NONALIGNED)
     uint32_t       block[16];
 #endif

     p = data;

     a = ctx->a;
     b = ctx->b;
     c = ctx->c;
     d = ctx->d;

     do {
         saved_a = a;
         saved_b = b;
         saved_c = c;
         saved_d = d;

         /* Round 1 */

         STEP(F, a, b, c, d, SET(0),  0xd76aa478, 7);
         STEP(F, d, a, b, c, SET(1),  0xe8c7b756, 12);
         STEP(F, c, d, a, b, SET(2),  0x242070db, 17);
         STEP(F, b, c, d, a, SET(3),  0xc1bdceee, 22);
         STEP(F, a, b, c, d, SET(4),  0xf57c0faf, 7);
         STEP(F, d, a, b, c, SET(5),  0x4787c62a, 12);
         STEP(F, c, d, a, b, SET(6),  0xa8304613, 17);
         STEP(F, b, c, d, a, SET(7),  0xfd469501, 22);
         STEP(F, a, b, c, d, SET(8),  0x698098d8, 7);
         STEP(F, d, a, b, c, SET(9),  0x8b44f7af, 12);
         STEP(F, c, d, a, b, SET(10), 0xffff5bb1, 17);
         STEP(F, b, c, d, a, SET(11), 0x895cd7be, 22);
         STEP(F, a, b, c, d, SET(12), 0x6b901122, 7);
         STEP(F, d, a, b, c, SET(13), 0xfd987193, 12);
         STEP(F, c, d, a, b, SET(14), 0xa679438e, 17);
         STEP(F, b, c, d, a, SET(15), 0x49b40821, 22);

         /* Round 2 */

         STEP(G, a, b, c, d, GET(1),  0xf61e2562, 5);
         STEP(G, d, a, b, c, GET(6),  0xc040b340, 9);
         STEP(G, c, d, a, b, GET(11), 0x265e5a51, 14);
         STEP(G, b, c, d, a, GET(0),  0xe9b6c7aa, 20);
         STEP(G, a, b, c, d, GET(5),  0xd62f105d, 5);
         STEP(G, d, a, b, c, GET(10), 0x02441453, 9);
         STEP(G, c, d, a, b, GET(15), 0xd8a1e681, 14);
         STEP(G, b, c, d, a, GET(4),  0xe7d3fbc8, 20);
         STEP(G, a, b, c, d, GET(9),  0x21e1cde6, 5);
         STEP(G, d, a, b, c, GET(14), 0xc33707d6, 9);
         STEP(G, c, d, a, b, GET(3),  0xf4d50d87, 14);
         STEP(G, b, c, d, a, GET(8),  0x455a14ed, 20);
         STEP(G, a, b, c, d, GET(13), 0xa9e3e905, 5);
         STEP(G, d, a, b, c, GET(2),  0xfcefa3f8, 9);
         STEP(G, c, d, a, b, GET(7),  0x676f02d9, 14);
         STEP(G, b, c, d, a, GET(12), 0x8d2a4c8a, 20);

         /* Round 3 */

         STEP(H, a, b, c, d, GET(5),  0xfffa3942, 4);
         STEP(H, d, a, b, c, GET(8),  0x8771f681, 11);
         STEP(H, c, d, a, b, GET(11), 0x6d9d6122, 16);
         STEP(H, b, c, d, a, GET(14), 0xfde5380c, 23);
         STEP(H, a, b, c, d, GET(1),  0xa4beea44, 4);
         STEP(H, d, a, b, c, GET(4),  0x4bdecfa9, 11);
         STEP(H, c, d, a, b, GET(7),  0xf6bb4b60, 16);
         STEP(H, b, c, d, a, GET(10), 0xbebfbc70, 23);
         STEP(H, a, b, c, d, GET(13), 0x289b7ec6, 4);
         STEP(H, d, a, b, c, GET(0),  0xeaa127fa, 11);
         STEP(H, c, d, a, b, GET(3),  0xd4ef3085, 16);
         STEP(H, b, c, d, a, GET(6),  0x04881d05, 23);
         STEP(H, a, b, c, d, GET(9),  0xd9d4d039, 4);
         STEP(H, d, a, b, c, GET(12), 0xe6db99e5, 11);
         STEP(H, c, d, a, b, GET(15), 0x1fa27cf8, 16);
         STEP(H, b, c, d, a, GET(2),  0xc4ac5665, 23);

         /* Round 4 */

         STEP(I, a, b, c, d, GET(0),  0xf4292244, 6);
         STEP(I, d, a, b, c, GET(7),  0x432aff97, 10);
         STEP(I, c, d, a, b, GET(14), 0xab9423a7, 15);
         STEP(I, b, c, d, a, GET(5),  0xfc93a039, 21);
         STEP(I, a, b, c, d, GET(12), 0x655b59c3, 6);
         STEP(I, d, a, b, c, GET(3),  0x8f0ccc92, 10);
         STEP(I, c, d, a, b, GET(10), 0xffeff47d, 15);
         STEP(I, b, c, d, a, GET(1),  0x85845dd1, 21);
         STEP(I, a, b, c, d, GET(8),  0x6fa87e4f, 6);
         STEP(I, d, a, b, c, GET(15), 0xfe2ce6e0, 10);
         STEP(I, c, d, a, b, GET(6),  0xa3014314, 15);
         STEP(I, b, c, d, a, GET(13), 0x4e0811a1, 21);
         STEP(I, a, b, c, d, GET(4),  0xf7537e82, 6);
         STEP(I, d, a, b, c, GET(11), 0xbd3af235, 10);
         STEP(I, c, d, a, b, GET(2),  0x2ad7d2bb, 15);
         STEP(I, b, c, d, a, GET(9),  0xeb86d391, 21);

         a += saved_a;
         b += saved_b;
         c += saved_c;
         d += saved_d;

         p += 64;

     } while (size -= 64);

     ctx->a = a;
     ctx->b = b;
     ctx->c = c;
     ctx->d = d;

     return p;
 }

	/*
	* An internal implementation, based on Alexander Peslyak's
	* public domain implementation:
	* http://openwall.info/wiki/people/solar/software/public-domain-source-code/md5
	*/


	#include <ngx_config.h>
	#include <ngx_core.h>
	#include <ngx_md5.h>


	static const u_char ngx_md5_body(ngx_md5_t ctx, const u_char *data,
	size_t size);


	void
	ngx_md5_init(ngx_md5_t *ctx)
	{
	ctx->a = 0x67452301;
	ctx->b = 0xefcdab89;
	ctx->c = 0x98badcfe;
	ctx->d = 0x10325476;

	ctx->bytes = 0;
	}


	void
	ngx_md5_update(ngx_md5_t ctx, const void data, size_t size)
	{
	size_t used, free;

	used = (size_t) (ctx->bytes & 0x3f);
	ctx->bytes += size;

	if (used) {
	free = 64 - used;

	if (size < free) {
	ngx_memcpy(&ctx->buffer[used], data, size);
	return;
	}

	ngx_memcpy(&ctx->buffer[used], data, free);
	data = (u_char *) data + free;
	size -= free;
	(void) ngx_md5_body(ctx, ctx->buffer, 64);
	}

	if (size >= 64) {
	data = ngx_md5_body(ctx, data, size & ~(size_t) 0x3f);
	size &= 0x3f;
	}

	ngx_memcpy(ctx->buffer, data, size);
	}


	void
	ngx_md5_final(u_char result[16], ngx_md5_t *ctx)
	{
	size_t used, free;

	used = (size_t) (ctx->bytes & 0x3f);

	ctx->buffer[used++] = 0x80;

	free = 64 - used;

	if (free < 8) {
	ngx_memzero(&ctx->buffer[used], free);
	(void) ngx_md5_body(ctx, ctx->buffer, 64);
	used = 0;
	free = 64;
	}

	ngx_memzero(&ctx->buffer[used], free - 8);

	ctx->bytes <<= 3;
	ctx->buffer[56] = (u_char) ctx->bytes;
	ctx->buffer[57] = (u_char) (ctx->bytes >> 8);
	ctx->buffer[58] = (u_char) (ctx->bytes >> 16);
	ctx->buffer[59] = (u_char) (ctx->bytes >> 24);
	ctx->buffer[60] = (u_char) (ctx->bytes >> 32);
	ctx->buffer[61] = (u_char) (ctx->bytes >> 40);
	ctx->buffer[62] = (u_char) (ctx->bytes >> 48);
	ctx->buffer[63] = (u_char) (ctx->bytes >> 56);

	(void) ngx_md5_body(ctx, ctx->buffer, 64);

	result[0] = (u_char) ctx->a;
	result[1] = (u_char) (ctx->a >> 8);
	result[2] = (u_char) (ctx->a >> 16);
	result[3] = (u_char) (ctx->a >> 24);
	result[4] = (u_char) ctx->b;
	result[5] = (u_char) (ctx->b >> 8);
	result[6] = (u_char) (ctx->b >> 16);
	result[7] = (u_char) (ctx->b >> 24);
	result[8] = (u_char) ctx->c;
	result[9] = (u_char) (ctx->c >> 8);
	result[10] = (u_char) (ctx->c >> 16);
	result[11] = (u_char) (ctx->c >> 24);
	result[12] = (u_char) ctx->d;
	result[13] = (u_char) (ctx->d >> 8);
	result[14] = (u_char) (ctx->d >> 16);
	result[15] = (u_char) (ctx->d >> 24);

	ngx_memzero(ctx, sizeof(*ctx));
	}


	/*
	* The basic MD5 functions.
	*
	* F and G are optimized compared to their RFC 1321 definitions for
	* architectures that lack an AND-NOT instruction, just like in
	* Colin Plumb's implementation.
	*/

	#define F(x, y, z) ((z) ^ ((x) & ((y) ^ (z))))
	#define G(x, y, z) ((y) ^ ((z) & ((x) ^ (y))))
	#define H(x, y, z) ((x) ^ (y) ^ (z))
	#define I(x, y, z) ((y) ^ ((x) \| ~(z)))

	/*
	* The MD5 transformation for all four rounds.
	*/

	#define STEP(f, a, b, c, d, x, t, s) \
	(a) += f((b), (c), (d)) + (x) + (t); \
	(a) = (((a) << (s)) \| (((a) & 0xffffffff) >> (32 - (s)))); \
	(a) += (b)

	/*
	* SET() reads 4 input bytes in little-endian byte order and stores them
	* in a properly aligned word in host byte order.
	*
	* The check for little-endian architectures that tolerate unaligned
	* memory accesses is just an optimization. Nothing will break if it
	* does not work.
	*/

	#if (NGX_HAVE_LITTLE_ENDIAN && NGX_HAVE_NONALIGNED)

	#define SET(n) ((uint32_t ) &p[n * 4])
	#define GET(n) ((uint32_t ) &p[n * 4])

	#else

	#define SET(n) \
	(block[n] = \
	(uint32_t) p[n * 4] \| \
	((uint32_t) p[n * 4 + 1] << 8) \| \
	((uint32_t) p[n * 4 + 2] << 16) \| \
	((uint32_t) p[n * 4 + 3] << 24))

	#define GET(n) block[n]

	#endif


	/*
	* This processes one or more 64-byte data blocks, but does not update
	* the bit counters. There are no alignment requirements.
	*/

	static const u_char *
	ngx_md5_body(ngx_md5_t ctx, const u_char data, size_t size)
	{
	uint32_t a, b, c, d;
	uint32_t saved_a, saved_b, saved_c, saved_d;
	const u_char *p;
	#if !(NGX_HAVE_LITTLE_ENDIAN && NGX_HAVE_NONALIGNED)
	uint32_t block[16];
	#endif

	p = data;

	a = ctx->a;
	b = ctx->b;
	c = ctx->c;
	d = ctx->d;

	do {
	saved_a = a;
	saved_b = b;
	saved_c = c;
	saved_d = d;

	/* Round 1 */

	STEP(F, a, b, c, d, SET(0), 0xd76aa478, 7);
	STEP(F, d, a, b, c, SET(1), 0xe8c7b756, 12);
	STEP(F, c, d, a, b, SET(2), 0x242070db, 17);
	STEP(F, b, c, d, a, SET(3), 0xc1bdceee, 22);
	STEP(F, a, b, c, d, SET(4), 0xf57c0faf, 7);
	STEP(F, d, a, b, c, SET(5), 0x4787c62a, 12);
	STEP(F, c, d, a, b, SET(6), 0xa8304613, 17);
	STEP(F, b, c, d, a, SET(7), 0xfd469501, 22);
	STEP(F, a, b, c, d, SET(8), 0x698098d8, 7);
	STEP(F, d, a, b, c, SET(9), 0x8b44f7af, 12);
	STEP(F, c, d, a, b, SET(10), 0xffff5bb1, 17);
	STEP(F, b, c, d, a, SET(11), 0x895cd7be, 22);
	STEP(F, a, b, c, d, SET(12), 0x6b901122, 7);
	STEP(F, d, a, b, c, SET(13), 0xfd987193, 12);
	STEP(F, c, d, a, b, SET(14), 0xa679438e, 17);
	STEP(F, b, c, d, a, SET(15), 0x49b40821, 22);

	/* Round 2 */

	STEP(G, a, b, c, d, GET(1), 0xf61e2562, 5);
	STEP(G, d, a, b, c, GET(6), 0xc040b340, 9);
	STEP(G, c, d, a, b, GET(11), 0x265e5a51, 14);
	STEP(G, b, c, d, a, GET(0), 0xe9b6c7aa, 20);
	STEP(G, a, b, c, d, GET(5), 0xd62f105d, 5);
	STEP(G, d, a, b, c, GET(10), 0x02441453, 9);
	STEP(G, c, d, a, b, GET(15), 0xd8a1e681, 14);
	STEP(G, b, c, d, a, GET(4), 0xe7d3fbc8, 20);
	STEP(G, a, b, c, d, GET(9), 0x21e1cde6, 5);
	STEP(G, d, a, b, c, GET(14), 0xc33707d6, 9);
	STEP(G, c, d, a, b, GET(3), 0xf4d50d87, 14);
	STEP(G, b, c, d, a, GET(8), 0x455a14ed, 20);
	STEP(G, a, b, c, d, GET(13), 0xa9e3e905, 5);
	STEP(G, d, a, b, c, GET(2), 0xfcefa3f8, 9);
	STEP(G, c, d, a, b, GET(7), 0x676f02d9, 14);
	STEP(G, b, c, d, a, GET(12), 0x8d2a4c8a, 20);

	/* Round 3 */

	STEP(H, a, b, c, d, GET(5), 0xfffa3942, 4);
	STEP(H, d, a, b, c, GET(8), 0x8771f681, 11);
	STEP(H, c, d, a, b, GET(11), 0x6d9d6122, 16);
	STEP(H, b, c, d, a, GET(14), 0xfde5380c, 23);
	STEP(H, a, b, c, d, GET(1), 0xa4beea44, 4);
	STEP(H, d, a, b, c, GET(4), 0x4bdecfa9, 11);
	STEP(H, c, d, a, b, GET(7), 0xf6bb4b60, 16);
	STEP(H, b, c, d, a, GET(10), 0xbebfbc70, 23);
	STEP(H, a, b, c, d, GET(13), 0x289b7ec6, 4);
	STEP(H, d, a, b, c, GET(0), 0xeaa127fa, 11);
	STEP(H, c, d, a, b, GET(3), 0xd4ef3085, 16);
	STEP(H, b, c, d, a, GET(6), 0x04881d05, 23);
	STEP(H, a, b, c, d, GET(9), 0xd9d4d039, 4);
	STEP(H, d, a, b, c, GET(12), 0xe6db99e5, 11);
	STEP(H, c, d, a, b, GET(15), 0x1fa27cf8, 16);
	STEP(H, b, c, d, a, GET(2), 0xc4ac5665, 23);

	/* Round 4 */

	STEP(I, a, b, c, d, GET(0), 0xf4292244, 6);
	STEP(I, d, a, b, c, GET(7), 0x432aff97, 10);
	STEP(I, c, d, a, b, GET(14), 0xab9423a7, 15);
	STEP(I, b, c, d, a, GET(5), 0xfc93a039, 21);
	STEP(I, a, b, c, d, GET(12), 0x655b59c3, 6);
	STEP(I, d, a, b, c, GET(3), 0x8f0ccc92, 10);
	STEP(I, c, d, a, b, GET(10), 0xffeff47d, 15);
	STEP(I, b, c, d, a, GET(1), 0x85845dd1, 21);
	STEP(I, a, b, c, d, GET(8), 0x6fa87e4f, 6);
	STEP(I, d, a, b, c, GET(15), 0xfe2ce6e0, 10);
	STEP(I, c, d, a, b, GET(6), 0xa3014314, 15);
	STEP(I, b, c, d, a, GET(13), 0x4e0811a1, 21);
	STEP(I, a, b, c, d, GET(4), 0xf7537e82, 6);
	STEP(I, d, a, b, c, GET(11), 0xbd3af235, 10);
	STEP(I, c, d, a, b, GET(2), 0x2ad7d2bb, 15);
	STEP(I, b, c, d, a, GET(9), 0xeb86d391, 21);

	a += saved_a;
	b += saved_b;
	c += saved_c;
	d += saved_d;

	p += 64;

	} while (size -= 64);

	ctx->a = a;
	ctx->b = b;
	ctx->c = c;
	ctx->d = d;

	return p;
	}