md5.h File Reference

MD5 digest functions. More...

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Data Structures
struct	MD5Context

Functions
void	MD5Final (unsigned char digest[16], struct MD5Context *context)
void	MD5Init (struct MD5Context *context)
void	MD5Transform (uint32_t buf[4], uint32_t const in[16])
void	MD5Update (struct MD5Context *context, unsigned char const *buf, unsigned len)

Detailed Description

MD5 digest functions.

Definition in file md5.h.

Function Documentation

MD5Final()

void MD5Final	(	unsigned char	digest[16],
		struct MD5Context *	context
	)

Definition at line 120 of file md5.c.

References MD5Context::bits, MD5Context::buf, byteReverse, MD5Context::in, and MD5Transform().

Referenced by ast_md5_hash(), authenticate(), authenticate_verify(), decrypt_frame(), festival_exec(), iax2_key_rotate(), manager_login(), prov_ver_calc(), register_verify(), try_firmware(), try_load_key(), and verify_key().

{
   unsigned count;
   unsigned char *p;
   uint32_t *in_buf;

   /* Compute number of bytes mod 64 */
   count = (ctx->bits[0] >> 3) & 0x3F;

   /* Set the first char of padding to 0x80.  This is safe since there is
      always at least one byte free */
   p = ctx->in + count;
   *p++ = 0x80;

   /* Bytes of padding needed to make 64 bytes */
   count = 64 - 1 - count;

   /* Pad out to 56 mod 64 */
   if (count < 8) {
      /* Two lots of padding:  Pad the first block to 64 bytes */
      memset(p, 0, count);
      byteReverse(ctx->in, 16);
      MD5Transform(ctx->buf, (uint32_t *) ctx->in);

      /* Now fill the next block with 56 bytes */
      memset(ctx->in, 0, 56);
   } else {
      /* Pad block to 56 bytes */
      memset(p, 0, count - 8);
   }
   byteReverse(ctx->in, 14);

   /* Append length in bits and transform */
   in_buf = (uint32_t *) ctx->in;
   in_buf[14] = ctx->bits[0];
   in_buf[15] = ctx->bits[1];

   MD5Transform(ctx->buf, (uint32_t *) ctx->in);
   byteReverse((unsigned char *) ctx->buf, 4);
   memcpy(digest, ctx->buf, 16);
   memset(ctx, 0, sizeof(*ctx)); /* In case it's sensitive */
}

MD5Init()

void MD5Init

(

struct MD5Context *

context

)

Definition at line 57 of file md5.c.

References MD5Context::bits, and MD5Context::buf.

Referenced by ast_md5_hash(), authenticate(), authenticate_verify(), decrypt_frame(), festival_exec(), iax2_key_rotate(), manager_login(), prov_ver_calc(), register_verify(), try_firmware(), try_load_key(), and verify_key().

{
   ctx->buf[0] = 0x67452301;
   ctx->buf[1] = 0xefcdab89;
   ctx->buf[2] = 0x98badcfe;
   ctx->buf[3] = 0x10325476;

   ctx->bits[0] = 0;
   ctx->bits[1] = 0;
}

MD5Transform()

void MD5Transform	(	uint32_t	buf[4],
		uint32_t const	in[16]
	)

Definition at line 182 of file md5.c.

References a, b, c, d, F1, F2, F3, F4, and MD5STEP.

Referenced by MD5Final(), and MD5Update().

{
   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;
}

MD5Update()

void MD5Update	(	struct MD5Context *	context,
		unsigned char const *	buf,
		unsigned	len
	)

Definition at line 72 of file md5.c.

References MD5Context::bits, MD5Context::buf, byteReverse, if(), MD5Context::in, and MD5Transform().

Referenced by ast_md5_hash(), authenticate(), authenticate_verify(), decrypt_frame(), festival_exec(), iax2_key_rotate(), manager_login(), prov_ver_calc(), register_verify(), try_firmware(), try_load_key(), and verify_key().

{
   uint32_t t;

   /* Update bitcount */

   t = ctx->bits[0];
   if ((ctx->bits[0] = t + ((uint32_t) len << 3)) < t)
      ctx->bits[1]++;      /* Carry from low to high */
   ctx->bits[1] += len >> 29;

   t = (t >> 3) & 0x3f; /* Bytes already in shsInfo->data */

   /* Handle any leading odd-sized chunks */

   if (t) {
      unsigned char *p = (unsigned char *) ctx->in + t;

      t = 64 - t;
      if (len < t) {
         memcpy(p, buf, len);
         return;
      }
      memcpy(p, buf, t);
      byteReverse(ctx->in, 16);
      MD5Transform(ctx->buf, (uint32_t *) ctx->in);
      buf += t;
      len -= t;
   }
   /* Process data in 64-byte chunks */

   while (len >= 64) {
      memcpy(ctx->in, buf, 64);
      byteReverse(ctx->in, 16);
      MD5Transform(ctx->buf, (uint32_t *) ctx->in);
      buf += 64;
      len -= 64;
   }

   /* Handle any remaining bytes of data. */

   memcpy(ctx->in, buf, len);
}