md5.c File Reference

SIP-router core :: md5 hash supportModule: SIP-router core. More...

#include <string.h>
#include "md5.h"

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Defines

• #define ROTATE_LEFT(x, n)   (((x) << (n)) | ((x) >> (32-(n))))

  ROTATE_LEFT rotates x left n bits.
  

Constants for MD5Transform routine

• #define S11   7
• #define S12   12
• #define S13   17
• #define S14   22
• #define S21   5
• #define S22   9
• #define S23   14
• #define S24   20
• #define S31   4
• #define S32   11
• #define S33   16
• #define S34   23
• #define S41   6
• #define S42   10
• #define S43   15
• #define S44   21

F, G, H and I are basic MD5 functions

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

FF, GG, HH, and II transformations for rounds 1, 2, 3, and 4

FF, GG, HH, and II transformations for rounds 1, 2, 3, and 4.

Rotation is separate from addition to prevent recomputation.

• #define FF(a, b, c, d, x, s, ac)
• #define GG(a, b, c, d, x, s, ac)
• #define HH(a, b, c, d, x, s, ac)
• #define II(a, b, c, d, x, s, ac)

Functions

• static void Decode (unsigned int *output, unsigned char *input, unsigned int len)

  Decodes input (unsigned char) into output (unsigned int).
  

• static void Encode (unsigned char *output, unsigned int *input, unsigned int len)

  Encodes input (unsigned int) into output (unsigned char).
  

• void MD5Init (MD5_CTX *context)

  MD5 context initialization.
  

• static void MD5Transform (unsigned int state[4], unsigned char block[64])

  MD5 basic transformation.
  

• void U_MD5Final (unsigned char digest[16], MD5_CTX *context)

  MD5 finalization.
  

• void U_MD5Update (MD5_CTX *context, unsigned char *input, unsigned int inputLen)

  MD5 block update operation.
  

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Detailed Description

Definition in file md5.c.

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Function Documentation

static void Decode	(	unsigned int *	output,
		unsigned char *	input,
		unsigned int	len
	)			[static]

Decodes input (unsigned char) into output (unsigned int). Assumes len is a multiple of 4.

Parameters:

	output	output integer
	input	input character
	len	length of input

Definition at line 336 of file md5.c.

Referenced by MD5Transform().

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static void Encode	(	unsigned char *	output,
		unsigned int *	input,
		unsigned int	len
	)			[static]

Encodes input (unsigned int) into output (unsigned char). Assumes len is a multiple of 4.

Parameters:

	output	output character
	input	integer input
	len	length of output

Definition at line 315 of file md5.c.

Referenced by U_MD5Final().

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void MD5Init

(

MD5_CTX *

context

)

MD5 context initialization. Begins an MD5 operation, writing a new context.

Parameters:

context

initialized context

Definition at line 120 of file md5.c.

Referenced by compute_md5(), hash(), and MD5StringArray().

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static void MD5Transform	(	unsigned int	state[4],
		unsigned char	block[64]
	)			[static]

MD5 basic transformation. Transforms state based on block.

Parameters:

	state	transformed state
	block	block input for transformation

Definition at line 218 of file md5.c.

References Decode().

Referenced by U_MD5Update().

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void U_MD5Final	(	unsigned char	digest[16],
		MD5_CTX *	context
	)

MD5 finalization. Ends an MD5 message-digest operation, writing the the message digest and zeroizing the context.

Parameters:

	digest	message digest
	context	context

Definition at line 186 of file md5.c.

References Encode(), and U_MD5Update().

Referenced by compute_md5(), MD5Final(), and MD5StringArray().

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void U_MD5Update	(	MD5_CTX *	context,
		unsigned char *	input,
		unsigned int	inputLen
	)

MD5 block update operation. Continues an MD5 message-digest operation, processing another message block, and updating the context.

Parameters:

	context	context
	input	input block
	inputLen	length of input block

Definition at line 141 of file md5.c.

References MD5Transform().

Referenced by MD5Update(), and U_MD5Final().

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