SDL_test_md5.h File Reference

#include "begin_code.h"
#include "close_code.h"

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Data Structures
struct	SDLTest_Md5Context

Typedefs
typedef unsigned long int	MD5UINT4

Functions
void	SDLTest_Md5Init (SDLTest_Md5Context *mdContext)
	initialize the context
void	SDLTest_Md5Update (SDLTest_Md5Context *mdContext, unsigned char *inBuf, unsigned int inLen)
	update digest from variable length data
void	SDLTest_Md5Final (SDLTest_Md5Context *mdContext)
	complete digest computation

Detailed Description

Include file for SDL test framework.

This code is a part of the SDL2_test library, not the main SDL library.

Definition in file SDL_test_md5.h.

Typedef Documentation

typedef unsigned long int MD5UINT4

Definition at line 68 of file SDL_test_md5.h.

Function Documentation

void SDLTest_Md5Final

(

SDLTest_Md5Context *

mdContext

)

complete digest computation

Parameters

mdContext

pointer to context variable

Note: The function terminates the message-digest computation and ends with the desired message digest in mdContext.digest[0..15]. Always call before using the digest[] variable.

Definition at line 180 of file SDL_test_md5.c.

References SDLTest_Md5Context::buf, SDLTest_Md5Context::digest, i, SDLTest_Md5Context::i, SDLTest_Md5Context::in, MD5PADDING, NULL, SDLTest_Md5Transform(), and SDLTest_Md5Update().

Referenced by SDLTest_GenerateExecKey().

{
  MD5UINT4  in[16];
  int       mdi;
  unsigned int i, ii;
  unsigned int padLen;

  if (mdContext == NULL) return;

  /*
   * save number of bits
   */
  in[14] = mdContext->i[0];
  in[15] = mdContext->i[1];

  /*
   * compute number of bytes mod 64
   */
  mdi = (int) ((mdContext->i[0] >> 3) & 0x3F);

  /*
   * pad out to 56 mod 64
   */
  padLen = (mdi < 56) ? (56 - mdi) : (120 - mdi);
  SDLTest_Md5Update(mdContext, MD5PADDING, padLen);

  /*
   * append length in bits and transform
   */
  for (i = 0, ii = 0; i < 14; i++, ii += 4)
    in[i] = (((MD5UINT4) mdContext->in[ii + 3]) << 24) |
      (((MD5UINT4) mdContext->in[ii + 2]) << 16) |
      (((MD5UINT4) mdContext->in[ii + 1]) << 8) |
      ((MD5UINT4) mdContext->in[ii]);
  SDLTest_Md5Transform(mdContext->buf, in);

  /*
   * store buffer in digest
   */
  for (i = 0, ii = 0; i < 4; i++, ii += 4) {
    mdContext->digest[ii] = (unsigned char) (mdContext->buf[i] & 0xFF);
    mdContext->digest[ii + 1] =
      (unsigned char) ((mdContext->buf[i] >> 8) & 0xFF);
    mdContext->digest[ii + 2] =
      (unsigned char) ((mdContext->buf[i] >> 16) & 0xFF);
    mdContext->digest[ii + 3] =
      (unsigned char) ((mdContext->buf[i] >> 24) & 0xFF);
  }
}

void SDLTest_Md5Init

(

SDLTest_Md5Context *

mdContext

)

initialize the context

Parameters

mdContext

pointer to context variable

Note: The function initializes the message-digest context mdContext. Call before each new use of the context - all fields are set to zero.

Definition at line 110 of file SDL_test_md5.c.

References SDLTest_Md5Context::buf, SDLTest_Md5Context::i, and NULL.

Referenced by SDLTest_GenerateExecKey().

{
  if (mdContext==NULL) return;

  mdContext->i[0] = mdContext->i[1] = (MD5UINT4) 0;

  /*
   * Load magic initialization constants.
   */
  mdContext->buf[0] = (MD5UINT4) 0x67452301;
  mdContext->buf[1] = (MD5UINT4) 0xefcdab89;
  mdContext->buf[2] = (MD5UINT4) 0x98badcfe;
  mdContext->buf[3] = (MD5UINT4) 0x10325476;
}

void SDLTest_Md5Update	(	SDLTest_Md5Context *	mdContext,
		unsigned char *	inBuf,
		unsigned int	inLen
	)

update digest from variable length data

Parameters

mdContext	pointer to context variable
inBuf	pointer to data array/string
inLen	length of data array/string

Note: The function updates the message-digest context to account for the presence of each of the characters inBuf[0..inLen-1] in the message whose digest is being computed.

Definition at line 131 of file SDL_test_md5.c.

References SDLTest_Md5Context::buf, i, SDLTest_Md5Context::i, SDLTest_Md5Context::in, NULL, and SDLTest_Md5Transform().

Referenced by SDLTest_GenerateExecKey(), and SDLTest_Md5Final().

{
  MD5UINT4  in[16];
  int       mdi;
  unsigned int i, ii;

  if (mdContext == NULL) return;
  if (inBuf == NULL || inLen < 1) return;

  /*
   * compute number of bytes mod 64
   */
  mdi = (int) ((mdContext->i[0] >> 3) & 0x3F);

  /*
   * update number of bits
   */
  if ((mdContext->i[0] + ((MD5UINT4) inLen << 3)) < mdContext->i[0])
    mdContext->i[1]++;
  mdContext->i[0] += ((MD5UINT4) inLen << 3);
  mdContext->i[1] += ((MD5UINT4) inLen >> 29);

  while (inLen--) {
    /*
     * add new character to buffer, increment mdi
     */
    mdContext->in[mdi++] = *inBuf++;

    /*
     * transform if necessary
     */
    if (mdi == 0x40) {
      for (i = 0, ii = 0; i < 16; i++, ii += 4)
    in[i] = (((MD5UINT4) mdContext->in[ii + 3]) << 24) |
      (((MD5UINT4) mdContext->in[ii + 2]) << 16) |
      (((MD5UINT4) mdContext->in[ii + 1]) << 8) |
      ((MD5UINT4) mdContext->in[ii]);
      SDLTest_Md5Transform(mdContext->buf, in);
      mdi = 0;
    }
  }
}