md5.c-Dateireferenz

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

Include-Abhängigkeitsdiagramm für md5.c:

gehe zum Quellcode dieser Datei

Datenstrukturen
struct	MD5Context

Makrodefinitionen
#define	INTERNAL_MD5   1
#define	byteReverse(buf, len)   /* Nothing */
#define	F1(x, y, z)   (z ^ (x & (y ^ z)))
#define	F2(x, y, z)   F1(z, x, y)
#define	F3(x, y, z)   (x ^ y ^ z)
#define	F4(x, y, z)   (y ^ (x | ~z))
#define	MD5STEP(f, w, x, y, z, data, s)   ( w += f(x, y, z) + data, w = w<<s | w>>(32-s), w += x )

Typdefinitionen
typedef struct MD5Context	MD5_CTX

Funktionen
void	hmac_md5_vector (const u8 *key, size_t key_len, size_t num_elem, const u8 *addr[], const size_t *len, u8 *mac)
void	hmac_md5 (const u8 *key, size_t key_len, const u8 *data, size_t data_len, u8 *mac)
static void	MD5Init (struct MD5Context *context)
static void	MD5Update (struct MD5Context *context, unsigned char const *buf, unsigned len)
static void	MD5Final (unsigned char digest[16], struct MD5Context *context)
static void	MD5Transform (u32 buf[4], u32 const in[16])
void	md5_vector (size_t num_elem, const u8 *addr[], const size_t *len, u8 *mac)

Makro-Dokumentation

#define byteReverse	(		buf,
			len
	)		/* Nothing */

Definiert in Zeile 168 der Datei md5.c.

#define F1	(		x,
			y,
			z
	)		(z ^ (x & (y ^ z)))

Definiert in Zeile 296 der Datei md5.c.

#define F2	(		x,
			y,
			z
	)		F1(z, x, y)

Definiert in Zeile 297 der Datei md5.c.

#define F3	(		x,
			y,
			z
	)		(x ^ y ^ z)

Definiert in Zeile 298 der Datei md5.c.

#define F4	(		x,
			y,
			z
	)		(y ^ (x | ~z))

Definiert in Zeile 299 der Datei md5.c.

#define INTERNAL_MD5   1

Definiert in Zeile 108 der Datei md5.c.

#define MD5STEP	(		f,
			w,
			x,
			y,
			z,
			data,
			s
	)		( w += f(x, y, z) + data, w = w<<s | w>>(32-s), w += x )

Definiert in Zeile 302 der Datei md5.c.

Dokumentation der benutzerdefinierten Typen

typedef struct MD5Context MD5_CTX

Definiert in Zeile 127 der Datei md5.c.

Dokumentation der Funktionen

void hmac_md5	(	const u8 *	key,
		size_t	key_len,
		const u8 *	data,
		size_t	data_len,
		u8 *	mac
	)

hmac_md5 - HMAC-MD5 over data buffer (RFC 2104) : Key for HMAC operations : Length of the key in bytes : Pointers to the data area : Length of the data area : Buffer for the hash (16 bytes)

Definiert in Zeile 102 der Datei md5.c.

{
    hmac_md5_vector(key, key_len, 1, &data, &data_len, mac);
}

void hmac_md5_vector	(	const u8 *	key,
		size_t	key_len,
		size_t	num_elem,
		const u8 *	addr[],
		const size_t *	len,
		u8 *	mac
	)

hmac_md5_vector - HMAC-MD5 over data vector (RFC 2104) : Key for HMAC operations : Length of the key in bytes : Number of elements in the data vector : Pointers to the data areas : Lengths of the data blocks : Buffer for the hash (16 bytes)

Definiert in Zeile 30 der Datei md5.c.

{
    u8 k_pad[64]; /* padding - key XORd with ipad/opad */
    u8 tk[16];
    const u8 *_addr[6];
    size_t i, _len[6];

    if (num_elem > 5) {
        /*
         * Fixed limit on the number of fragments to avoid having to
         * allocate memory (which could fail).
         */
        return;
    }

        /* if key is longer than 64 bytes reset it to key = MD5(key) */
        if (key_len > 64) {
        md5_vector(1, &key, &key_len, tk);
        key = tk;
        key_len = 16;
        }

    /* the HMAC_MD5 transform looks like:
     *
     * MD5(K XOR opad, MD5(K XOR ipad, text))
     *
     * where K is an n byte key
     * ipad is the byte 0x36 repeated 64 times
     * opad is the byte 0x5c repeated 64 times
     * and text is the data being protected */

    /* start out by storing key in ipad */
    os_memset(k_pad, 0, sizeof(k_pad));
    os_memcpy(k_pad, key, key_len);

    /* XOR key with ipad values */
    for (i = 0; i < 64; i++)
        k_pad[i] ^= 0x36;

    /* perform inner MD5 */
    _addr[0] = k_pad;
    _len[0] = 64;
    for (i = 0; i < num_elem; i++) {
        _addr[i + 1] = addr[i];
        _len[i + 1] = len[i];
    }
    md5_vector(1 + num_elem, _addr, _len, mac);

    os_memset(k_pad, 0, sizeof(k_pad));
    os_memcpy(k_pad, key, key_len);
    /* XOR key with opad values */
    for (i = 0; i < 64; i++)
        k_pad[i] ^= 0x5c;

    /* perform outer MD5 */
    _addr[0] = k_pad;
    _len[0] = 64;
    _addr[1] = mac;
    _len[1] = MD5_MAC_LEN;
    md5_vector(2, _addr, _len, mac);
}

void md5_vector	(	size_t	num_elem,
		const u8 *	addr[],
		const size_t *	len,
		u8 *	mac
	)

md5_vector - MD5 hash for data vector : Number of elements in the data vector : Pointers to the data areas : Lengths of the data blocks : Buffer for the hash

Definiert in Zeile 137 der Datei md5.c.

{
    MD5_CTX ctx;
    size_t i;

    MD5Init(&ctx);
    for (i = 0; i < num_elem; i++)
        MD5Update(&ctx, addr[i], len[i]);
    MD5Final(mac, &ctx);
}

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

static

Definiert in Zeile 252 der Datei md5.c.

{
    unsigned count;
    unsigned char *p;

    /* 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 */
    os_memset(p, 0, count);
    byteReverse(ctx->in, 16);
    MD5Transform(ctx->buf, (u32 *) ctx->in);

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

    /* Append length in bits and transform */
    ((u32 *) ctx->in)[14] = ctx->bits[0];
    ((u32 *) ctx->in)[15] = ctx->bits[1];

    MD5Transform(ctx->buf, (u32 *) ctx->in);
    byteReverse((unsigned char *) ctx->buf, 4);
    os_memcpy(digest, ctx->buf, 16);
    os_memset(ctx, 0, sizeof(struct MD5Context));   /* In case it's sensitive */
}

void MD5Init ( struct MD5Context *  context)

static

Definiert in Zeile 189 der Datei md5.c.

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

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

static void MD5Transform ( u32  buf[4], u32 const  in[16]  )

static

Definiert in Zeile 310 der Datei md5.c.

{
    register u32 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;
}

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

static

Definiert in Zeile 204 der Datei md5.c.

{
    u32 t;

    /* Update bitcount */

    t = ctx->bits[0];
    if ((ctx->bits[0] = t + ((u32) 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) {
        os_memcpy(p, buf, len);
        return;
    }
    os_memcpy(p, buf, t);
    byteReverse(ctx->in, 16);
    MD5Transform(ctx->buf, (u32 *) ctx->in);
    buf += t;
    len -= t;
    }
    /* Process data in 64-byte chunks */

    while (len >= 64) {
    os_memcpy(ctx->in, buf, 64);
    byteReverse(ctx->in, 16);
    MD5Transform(ctx->buf, (u32 *) ctx->in);
    buf += 64;
    len -= 64;
    }

    /* Handle any remaining bytes of data. */

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