md5.c File Reference

#include <stdio.h>
#include "gwlib.h"
#include "md5.h"

Go to the source code of this file.

Macros
#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
#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)))
#define	ROTATE_LEFT(x, n)   (((x) << (n)) | ((x) >> (32-(n))))
#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	md5_digest (char *md5str, unsigned char *digest)
static void	md5_init (md5_ctx *)
static void	md5_update (md5_ctx *, const unsigned char *, unsigned int)
static void	md5_final (unsigned char[16], md5_ctx *)
static void	md5_transform (unsigned int[4], const unsigned char[64])
static void	md5_encode (unsigned char *, unsigned int *, unsigned int)
static void	md5_decode (unsigned int *, const unsigned char *, unsigned int)
static void	md5_transform (state, block)
Octstr *	md5 (Octstr *data)
Octstr *	md5digest (Octstr *data)

Variables
static unsigned char	PADDING [64]

Macro Definition Documentation

F

#define F	(		x,
			y,
			z
	)		(((x) & (y)) | ((~x) & (z)))

Definition at line 147 of file md5.c.

FF

#define FF	(		a,
			b,
			c,
			d,
			x,
			s,
			ac
	)

Value:

{ \
 (a) += F ((b), (c), (d)) + (x) + (unsigned int)(ac); \
 (a) = ROTATE_LEFT ((a), (s)); \
 (a) += (b); \
  }

Definition at line 159 of file md5.c.

Referenced by md5_transform().

G

#define G	(		x,
			y,
			z
	)		(((x) & (z)) | ((y) & (~z)))

Definition at line 148 of file md5.c.

GG

#define GG	(		a,
			b,
			c,
			d,
			x,
			s,
			ac
	)

Value:

{ \
 (a) += G ((b), (c), (d)) + (x) + (unsigned int)(ac); \
 (a) = ROTATE_LEFT ((a), (s)); \
 (a) += (b); \
  }

Definition at line 164 of file md5.c.

Referenced by md5_transform().

H

#define H	(		x,
			y,
			z
	)		((x) ^ (y) ^ (z))

Definition at line 149 of file md5.c.

HH

#define HH	(		a,
			b,
			c,
			d,
			x,
			s,
			ac
	)

Value:

{ \
 (a) += H ((b), (c), (d)) + (x) + (unsigned int)(ac); \
 (a) = ROTATE_LEFT ((a), (s)); \
 (a) += (b); \
  }

Definition at line 169 of file md5.c.

Referenced by md5_transform().

I

#define I	(		x,
			y,
			z
	)		((y) ^ ((x) | (~z)))

Definition at line 150 of file md5.c.

II

#define II	(		a,
			b,
			c,
			d,
			x,
			s,
			ac
	)

Value:

{ \
 (a) += I ((b), (c), (d)) + (x) + (unsigned int)(ac); \
 (a) = ROTATE_LEFT ((a), (s)); \
 (a) += (b); \
  }

Definition at line 174 of file md5.c.

Referenced by md5_transform().

ROTATE_LEFT

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

Definition at line 154 of file md5.c.

S11

#define S11   7

Definition at line 117 of file md5.c.

Referenced by md5_transform().

S12

#define S12   12

Definition at line 118 of file md5.c.

Referenced by md5_transform().

S13

#define S13   17

Definition at line 119 of file md5.c.

Referenced by md5_transform().

S14

#define S14   22

Definition at line 120 of file md5.c.

Referenced by md5_transform().

S21

#define S21   5

Definition at line 121 of file md5.c.

Referenced by md5_transform().

S22

#define S22   9

Definition at line 122 of file md5.c.

Referenced by md5_transform().

S23

#define S23   14

Definition at line 123 of file md5.c.

Referenced by md5_transform().

S24

#define S24   20

Definition at line 124 of file md5.c.

Referenced by md5_transform().

S31

#define S31   4

Definition at line 125 of file md5.c.

Referenced by md5_transform().

S32

#define S32   11

Definition at line 126 of file md5.c.

Referenced by md5_transform().

S33

#define S33   16

Definition at line 127 of file md5.c.

Referenced by md5_transform().

S34

#define S34   23

Definition at line 128 of file md5.c.

Referenced by md5_transform().

S41

#define S41   6

Definition at line 129 of file md5.c.

Referenced by md5_transform().

S42

#define S42   10

Definition at line 130 of file md5.c.

Referenced by md5_transform().

S43

#define S43   15

Definition at line 131 of file md5.c.

Referenced by md5_transform().

S44

#define S44   21

Definition at line 132 of file md5.c.

Referenced by md5_transform().

Function Documentation

md5()

Octstr* md5

(

Octstr *

data

)

Definition at line 387 of file md5.c.

References md5_final(), md5_init(), md5_update(), octstr_create_from_data, octstr_get_cstr, and octstr_len().

Referenced by cfg_get_group_checksum(), main(), md5digest(), and radius_authenticate_pdu().

{
    md5_ctx context;
    unsigned char digest[16];
    Octstr *enc;

    if (data == NULL)
        return NULL;

    md5_init(&context);
    md5_update(&context, octstr_get_cstr(data), octstr_len(data));
    md5_final(digest, &context);

    enc = octstr_create_from_data(digest, 16); 

    return enc; 
}

md5_decode()

static void md5_decode ( unsigned int *  output, const unsigned char *  input, unsigned int  len  )

static

Definition at line 374 of file md5.c.

Referenced by md5_transform().

{
    unsigned int i, j;

    for (i = 0, j = 0; j < len; i++, j += 4)
        output[i] = ((unsigned int) input[j]) | (((unsigned int) input[j + 1]) << 8) |
            (((unsigned int) input[j + 2]) << 16) | (((unsigned int) input[j + 3]) << 24);
}

md5_digest()

static void md5_digest ( char *  md5str, unsigned char *  digest  )

static

Definition at line 102 of file md5.c.

Referenced by md5digest().

{
    int i;

    for (i = 0; i < 16; i++) {
        sprintf(md5str, "%02x", digest[i]);
        md5str += 2;
    }

    *md5str = '\0';
}

md5_encode()

static void md5_encode ( unsigned char *  output, unsigned int *  input, unsigned int  len  )

static

Definition at line 355 of file md5.c.

Referenced by md5_final().

{
    unsigned int i, j;

    for (i = 0, j = 0; j < len; i++, j += 4) {
        output[j] = (unsigned char) (input[i] & 0xff);
        output[j + 1] = (unsigned char) ((input[i] >> 8) & 0xff);
        output[j + 2] = (unsigned char) ((input[i] >> 16) & 0xff);
        output[j + 3] = (unsigned char) ((input[i] >> 24) & 0xff);
    }
}

md5_final()

static void md5_final ( unsigned char  digest[16], md5_ctx *  context  )

static

Definition at line 233 of file md5.c.

References md5_encode(), md5_update(), and PADDING.

Referenced by md5().

{
    unsigned char bits[8];
    unsigned int index, padLen;

    /* Save number of bits */
    md5_encode(bits, context->count, 8);

    /* Pad out to 56 mod 64.
     */
    index = (unsigned int) ((context->count[0] >> 3) & 0x3f);
    padLen = (index < 56) ? (56 - index) : (120 - index);
    md5_update(context, PADDING, padLen);

    /* Append length (before padding) */
    md5_update(context, bits, 8);

    /* Store state in digest */
    md5_encode(digest, context->state, 16);

    /* Zeroize sensitive information.
     */
    memset((unsigned char*) context, 0, sizeof(*context));
}

md5_init()

static void md5_init ( md5_ctx *  context )

static

Definition at line 180 of file md5.c.

Referenced by md5().

{
    context->count[0] = context->count[1] = 0;
    /* Load magic initialization constants. */
    context->state[0] = 0x67452301;
    context->state[1] = 0xefcdab89;
    context->state[2] = 0x98badcfe;
    context->state[3] = 0x10325476;
}

md5_transform() [1/2]

static void md5_transform ( unsigned  int[4], const unsigned  char[64]  )

static

Referenced by md5_update().

md5_transform() [2/2]

static void md5_transform ( state  , block    )

static

Definition at line 262 of file md5.c.

References FF, GG, HH, II, md5_decode(), S11, S12, S13, S14, S21, S22, S23, S24, S31, S32, S33, S34, S41, S42, S43, and S44.

{
    unsigned int a = state[0], b = state[1], c = state[2], d = state[3], x[16];

    md5_decode(x, block, 64);

    /* Round 1 */
    FF(a, b, c, d, x[0], S11, 0xd76aa478);  /* 1 */
    FF(d, a, b, c, x[1], S12, 0xe8c7b756);  /* 2 */
    FF(c, d, a, b, x[2], S13, 0x242070db);  /* 3 */
    FF(b, c, d, a, x[3], S14, 0xc1bdceee);  /* 4 */
    FF(a, b, c, d, x[4], S11, 0xf57c0faf);  /* 5 */
    FF(d, a, b, c, x[5], S12, 0x4787c62a);  /* 6 */
    FF(c, d, a, b, x[6], S13, 0xa8304613);  /* 7 */
    FF(b, c, d, a, x[7], S14, 0xfd469501);  /* 8 */
    FF(a, b, c, d, x[8], S11, 0x698098d8);  /* 9 */
    FF(d, a, b, c, x[9], S12, 0x8b44f7af);  /* 10 */
    FF(c, d, a, b, x[10], S13, 0xffff5bb1);     /* 11 */
    FF(b, c, d, a, x[11], S14, 0x895cd7be);     /* 12 */
    FF(a, b, c, d, x[12], S11, 0x6b901122);     /* 13 */
    FF(d, a, b, c, x[13], S12, 0xfd987193);     /* 14 */
    FF(c, d, a, b, x[14], S13, 0xa679438e);     /* 15 */
    FF(b, c, d, a, x[15], S14, 0x49b40821);     /* 16 */

    /* Round 2 */
    GG(a, b, c, d, x[1], S21, 0xf61e2562);  /* 17 */
    GG(d, a, b, c, x[6], S22, 0xc040b340);  /* 18 */
    GG(c, d, a, b, x[11], S23, 0x265e5a51);     /* 19 */
    GG(b, c, d, a, x[0], S24, 0xe9b6c7aa);  /* 20 */
    GG(a, b, c, d, x[5], S21, 0xd62f105d);  /* 21 */
    GG(d, a, b, c, x[10], S22, 0x2441453);  /* 22 */
    GG(c, d, a, b, x[15], S23, 0xd8a1e681);     /* 23 */
    GG(b, c, d, a, x[4], S24, 0xe7d3fbc8);  /* 24 */
    GG(a, b, c, d, x[9], S21, 0x21e1cde6);  /* 25 */
    GG(d, a, b, c, x[14], S22, 0xc33707d6);     /* 26 */
    GG(c, d, a, b, x[3], S23, 0xf4d50d87);  /* 27 */
    GG(b, c, d, a, x[8], S24, 0x455a14ed);  /* 28 */
    GG(a, b, c, d, x[13], S21, 0xa9e3e905);     /* 29 */
    GG(d, a, b, c, x[2], S22, 0xfcefa3f8);  /* 30 */
    GG(c, d, a, b, x[7], S23, 0x676f02d9);  /* 31 */
    GG(b, c, d, a, x[12], S24, 0x8d2a4c8a);     /* 32 */

    /* Round 3 */
    HH(a, b, c, d, x[5], S31, 0xfffa3942);  /* 33 */
    HH(d, a, b, c, x[8], S32, 0x8771f681);  /* 34 */
    HH(c, d, a, b, x[11], S33, 0x6d9d6122);     /* 35 */
    HH(b, c, d, a, x[14], S34, 0xfde5380c);     /* 36 */
    HH(a, b, c, d, x[1], S31, 0xa4beea44);  /* 37 */
    HH(d, a, b, c, x[4], S32, 0x4bdecfa9);  /* 38 */
    HH(c, d, a, b, x[7], S33, 0xf6bb4b60);  /* 39 */
    HH(b, c, d, a, x[10], S34, 0xbebfbc70);     /* 40 */
    HH(a, b, c, d, x[13], S31, 0x289b7ec6);     /* 41 */
    HH(d, a, b, c, x[0], S32, 0xeaa127fa);  /* 42 */
    HH(c, d, a, b, x[3], S33, 0xd4ef3085);  /* 43 */
    HH(b, c, d, a, x[6], S34, 0x4881d05);   /* 44 */
    HH(a, b, c, d, x[9], S31, 0xd9d4d039);  /* 45 */
    HH(d, a, b, c, x[12], S32, 0xe6db99e5);     /* 46 */
    HH(c, d, a, b, x[15], S33, 0x1fa27cf8);     /* 47 */
    HH(b, c, d, a, x[2], S34, 0xc4ac5665);  /* 48 */

    /* Round 4 */
    II(a, b, c, d, x[0], S41, 0xf4292244);  /* 49 */
    II(d, a, b, c, x[7], S42, 0x432aff97);  /* 50 */
    II(c, d, a, b, x[14], S43, 0xab9423a7);     /* 51 */
    II(b, c, d, a, x[5], S44, 0xfc93a039);  /* 52 */
    II(a, b, c, d, x[12], S41, 0x655b59c3);     /* 53 */
    II(d, a, b, c, x[3], S42, 0x8f0ccc92);  /* 54 */
    II(c, d, a, b, x[10], S43, 0xffeff47d);     /* 55 */
    II(b, c, d, a, x[1], S44, 0x85845dd1);  /* 56 */
    II(a, b, c, d, x[8], S41, 0x6fa87e4f);  /* 57 */
    II(d, a, b, c, x[15], S42, 0xfe2ce6e0);     /* 58 */
    II(c, d, a, b, x[6], S43, 0xa3014314);  /* 59 */
    II(b, c, d, a, x[13], S44, 0x4e0811a1);     /* 60 */
    II(a, b, c, d, x[4], S41, 0xf7537e82);  /* 61 */
    II(d, a, b, c, x[11], S42, 0xbd3af235);     /* 62 */
    II(c, d, a, b, x[2], S43, 0x2ad7d2bb);  /* 63 */
    II(b, c, d, a, x[9], S44, 0xeb86d391);  /* 64 */

    state[0] += a;
    state[1] += b;
    state[2] += c;
    state[3] += d;

    /* Zeroize sensitive information. */
    memset((unsigned char*) x, 0, sizeof(x));
}

md5_update()

static void md5_update ( md5_ctx *  context, const unsigned char *  input, unsigned int  inputLen  )

static

Definition at line 195 of file md5.c.

References md5_transform().

Referenced by md5(), and md5_final().

{
    unsigned int i, index, partLen;

    /* Compute number of bytes mod 64 */
    index = (unsigned int) ((context->count[0] >> 3) & 0x3F);

    /* Update number of bits */
    if ((context->count[0] += ((unsigned int) inputLen << 3))
        < ((unsigned int) inputLen << 3))
        context->count[1]++;
    context->count[1] += ((unsigned int) inputLen >> 29);

    partLen = 64 - index;

    /* Transform as many times as possible. */
    if (inputLen >= partLen) {
        memcpy((unsigned char*) & context->buffer[index], 
               (unsigned char*) input, partLen);
        md5_transform(context->state, context->buffer);

        for (i = partLen; i + 63 < inputLen; i += 64)
            md5_transform(context->state, &input[i]);

        index = 0;
    } else
        i = 0;

    /* Buffer remaining input */
    memcpy((unsigned char*) & context->buffer[index], (unsigned char*) & input[i],
           inputLen - i);
}

md5digest()

Octstr* md5digest

(

Octstr *

data

)

Definition at line 406 of file md5.c.

References md5(), md5_digest(), octstr_create, octstr_destroy(), and octstr_get_cstr.

Referenced by main(), and our_hash_func().

{
    char md5str[33];
    Octstr *digest;

    if (data == NULL)
        return NULL;

    md5str[0] = '\0';
    digest = md5(data);
    md5_digest(md5str, octstr_get_cstr(digest));
    octstr_destroy(digest);

    digest = octstr_create(md5str);

    return digest;
}

Variable Documentation

PADDING

unsigned char PADDING[64]

static

Initial value:

=
{
    0x80, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
}

Definition at line 138 of file md5.c.

Referenced by md5_final().