source code documentation

md5.c File Reference

Detailed Description

RFC 1321 - The MD5 Message-Digest Algorithm and RFC 2104 - HMAC: Keyed-Hashing for Message Authentication.

Author:: Christian Scheurer <http://www.christianscheurer.ch>

OUTLINE: This module contains mainly code extracted from the libssl library. We use this code to implement a HMAC. The functions used to implement the HMAC-MD5 are MD5_Init MD5_Update and MD5_Finish.

IMPLEMENTATION: "This product includes cryptographic software written by Eric Young (eay@cryptsoft.com)" (taken form www.openssl.org)"

NOTES:

This document is part of embedded IPsec
Copyright (c) 2003 Niklaus Schild and Christian Scheurer, HTI Biel/Bienne
All rights reserved.
This file contains code from the OpenSSL Project
portions Copyright (c) 1998-2003 OpenSSL (www.openssl.org)

Definition in file md5.c.

#include <string.h>
#include "ipsec/md5.h"
#include "ipsec/debug.h"

Go to the source code of this file.

Defines

#define INIT_DATA_A   (unsigned long)0x67452301L

#define INIT_DATA_B   (unsigned long)0xefcdab89L

#define INIT_DATA_C   (unsigned long)0x98badcfeL

#define INIT_DATA_D   (unsigned long)0x10325476L

#define HOST_c2l(c, l)

#define HOST_p_c2l(c, l, n)

#define HOST_p_c2l_p(c, l, sc, len)

#define HOST_c2l_p(c, l, n)

#define HOST_l2c(l, c)

#define F(b, c, d)   ((((c) ^ (d)) & (b)) ^ (d))

#define G(b, c, d)   ((((b) ^ (c)) & (d)) ^ (c))

#define H(b, c, d)   ((b) ^ (c) ^ (d))

#define I(b, c, d)   (((~(d)) | (b)) ^ (c))

#define R0(a, b, c, d, k, s, t)

#define R1(a, b, c, d, k, s, t)

#define R2(a, b, c, d, k, s, t)

#define R3(a, b, c, d, k, s, t)

#define X(i)   XX##i

Functions

unsigned char * MD5 (const unsigned char *d, unsigned long n, unsigned char *md)

void MD5_Init (MD5_CTX *c)

void md5_block_host_order (MD5_CTX *c, const void *p, int num)

void md5_block_data_order (MD5_CTX *c, const void *p, int num)

void MD5_Update (MD5_CTX *c, const void *data_, unsigned long len)

void MD5_Transform (MD5_CTX *c, const unsigned char *data)

void MD5_Final (unsigned char *md, MD5_CTX *c)

void hmac_md5 (unsigned char *text, int text_len, unsigned char *key, int key_len, unsigned char *digest)

Define Documentation

#define F ( b,
c,
d ) ((((c) ^ (d)) & (b)) ^ (d))

Definition at line 310 of file md5.c.

#define G ( b,
c,
d ) ((((b) ^ (c)) & (d)) ^ (c))

Definition at line 311 of file md5.c.

#define H ( b,
c,
d ) ((b) ^ (c) ^ (d))

Definition at line 312 of file md5.c.

#define HOST_c2l ( c,
l )

Value:
(l =(((unsigned long)(*((c)++))) ), \ l|=(((unsigned long)(*((c)++)))<< 8), \ l|=(((unsigned long)(*((c)++)))<<16), \ l|=(((unsigned long)(*((c)++)))<<24), \ l)

Definition at line 116 of file md5.c.

#define HOST_c2l_p ( c,
l,
n )

Value:
{ \ l=0; (c)+=n; \ switch (n) { \ case 3: l =((unsigned long)(*(--(c))))<<16; \ case 2: l|=((unsigned long)(*(--(c))))<< 8; \ case 1: l|=((unsigned long)(*(--(c)))); \ } }

Definition at line 137 of file md5.c.

#define HOST_l2c ( l,
c )

Value:
(*((c)++)=(unsigned char)(((l) )&0xff), \ *((c)++)=(unsigned char)(((l)>> 8)&0xff), \ *((c)++)=(unsigned char)(((l)>>16)&0xff), \ *((c)++)=(unsigned char)(((l)>>24)&0xff), \ l)

Definition at line 144 of file md5.c.

#define HOST_p_c2l ( c,
l,
n )

Value:
{ \ switch (n) { \ case 0: l =((unsigned long)(*((c)++))); \ case 1: l|=((unsigned long)(*((c)++)))<< 8; \ case 2: l|=((unsigned long)(*((c)++)))<<16; \ case 3: l|=((unsigned long)(*((c)++)))<<24; \ } }

Definition at line 121 of file md5.c.

#define HOST_p_c2l_p ( c,
l,
sc,
len )

Value:
{ \ switch (sc) { \ case 0: l =((unsigned long)(*((c)++))); \ if (--len == 0) break; \ case 1: l|=((unsigned long)(*((c)++)))<< 8; \ if (--len == 0) break; \ case 2: l|=((unsigned long)(*((c)++)))<<16; \ } }

Definition at line 128 of file md5.c.

#define I ( b,
c,
d ) (((~(d)) | (b)) ^ (c))

Definition at line 313 of file md5.c.

#define INIT_DATA_A (unsigned long)0x67452301L

Definition at line 74 of file md5.c.

#define INIT_DATA_B (unsigned long)0xefcdab89L

Definition at line 75 of file md5.c.

#define INIT_DATA_C (unsigned long)0x98badcfeL

Definition at line 76 of file md5.c.

#define INIT_DATA_D (unsigned long)0x10325476L

Definition at line 77 of file md5.c.

#define R0 ( a,
b,
c,
d,
k,
s,
t )

Value:
{ \ a+=((k)+(t)+F((b),(c),(d))); \ a=ROTATE(a,s); \ a+=b; };\

Definition at line 315 of file md5.c.

#define R1 ( a,
b,
c,
d,
k,
s,
t )

Value:
{ \ a+=((k)+(t)+G((b),(c),(d))); \ a=ROTATE(a,s); \ a+=b; };

Definition at line 320 of file md5.c.

#define R2 ( a,
b,
c,
d,
k,
s,
t )

Value:
{ \ a+=((k)+(t)+H((b),(c),(d))); \ a=ROTATE(a,s); \ a+=b; };

Definition at line 325 of file md5.c.

#define R3 ( a,
b,
c,
d,
k,
s,
t )

Value:
{ \ a+=((k)+(t)+I((b),(c),(d))); \ a=ROTATE(a,s); \ a+=b; };

Definition at line 330 of file md5.c.

#define X ( i ) XX##i

Function Documentation

void hmac_md5 ( unsigned char * text,

int text_len,

unsigned char * key,

int key_len,

unsigned char * digest

)

RFC 2104 hmac_md5 function calculates a digest from a given data buffer and a given key.

Parameters:

text pointer to data stream

text_len length of data stream

key pointer to authentication key

key_len length of authentication key

digest caller digest to be filled in 128-bit

Returns:
void

Definition at line 559 of file md5.c.

unsigned char* MD5 ( const unsigned char * d,

unsigned long n,

unsigned char * md

)

Definition at line 60 of file md5.c.

void md5_block_data_order ( MD5_CTX * c,

const void * p,

int num

)

Definition at line 440 of file md5.c.

void md5_block_host_order ( MD5_CTX * c,

const void * p,

int num

)

Definition at line 337 of file md5.c.

void MD5_Final ( unsigned char * md,

MD5_CTX * c

)

Definition at line 261 of file md5.c.

void MD5_Init ( MD5_CTX * c )

Definition at line 79 of file md5.c.

void MD5_Transform ( MD5_CTX * c,

const unsigned char * data

)

Definition at line 251 of file md5.c.

void MD5_Update ( MD5_CTX * c,

const void * data_,

unsigned long len

)

Definition at line 155 of file md5.c.