l_md5.c

/* MD5C.C - RSA Data Security, Inc., MD5 message-digest algorithm
 */

/* Copyright (C) 1991-2, RSA Data Security, Inc. Created 1991. All
    rights reserved.

    License to copy and use this software is granted provided that it
    is identified as the "RSA Data Security, Inc. MD5 Message-Digest
    Algorithm" in all material mentioning or referencing this software
    or this function.

    License is also granted to make and use derivative works provided
    that such works are identified as "derived from the RSA Data
    Security, Inc. MD5 Message-Digest Algorithm" in all material
    mentioning or referencing the derived work.

    RSA Data Security, Inc. makes no representations concerning either
    the merchantability of this software or the suitability of this
    software for any particular purpose. It is provided "as is"
    without express or implied warranty of any kind.

    These notices must be retained in any copies of any part of this
    documentation and/or software.
 */

#include <string.h>
#include <sys_type.h>
#include <l_md5.h>


/*   PROTOTYPES should be set to one if and only if the compiler supports
  function argument prototyping.
 The following makes PROTOTYPES default to 0 if it has not already
  been defined with C compiler flags.
*/
#ifndef PROTOTYPES
#define PROTOTYPES 0
#endif

/* POINTER defines a generic pointer type */
typedef unsigned char *POINTER;

/* UINT2 defines a two byte word */
typedef uint16_t UINT2;

/* UINT4 defines a four byte word */
typedef uint32_t UINT4;

/* PROTO_LIST is defined depending on how PROTOTYPES is defined above.
  If using PROTOTYPES, then PROTO_LIST returns the list, otherwise it
  returns an empty list.
 */
#if PROTOTYPES
#define PROTO_LIST(list) list
#else
#define PROTO_LIST(list) ()
#endif

/* MD5.H - header file for MD5C.C
 */

/* Copyright (C) 1991-2, RSA Data Security, Inc. Created 1991. All
    rights reserved.

    License to copy and use this software is granted provided that it
    is identified as the "RSA Data Security, Inc. MD5 Message-Digest
    Algorithm" in all material mentioning or referencing this software
    or this function.

    License is also granted to make and use derivative works provided
    that such works are identified as "derived from the RSA Data
    Security, Inc. MD5 Message-Digest Algorithm" in all material
    mentioning or referencing the derived work.

    RSA Data Security, Inc. makes no representations concerning either
    the merchantability of this software or the suitability of this
    software for any particular purpose. It is provided "as is"
    without express or implied warranty of any kind.

    These notices must be retained in any copies of any part of this
    documentation and/or software.
 */

/* MD5 context. */
typedef struct
{
  UINT4 state[4];                   /* state (ABCD) */
  UINT4 count[2];        /* number of bits, modulo 2^64 (lsb first) */
  unsigned char buffer[64];             /* input buffer */
} L_MD5_CTX;

void L_MD5Init PROTO_LIST ((L_MD5_CTX *));
void L_MD5Update PROTO_LIST
      ((L_MD5_CTX *, unsigned char *, unsigned int));
void L_MD5Final PROTO_LIST ((unsigned char [16], L_MD5_CTX *));
void L_MDString (unsigned char *digest, unsigned char *string, unsigned int len);

/* 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
#define UI16    unsigned

static void L_MD5Transform PROTO_LIST ((UINT4 [4], unsigned char [64]));
static void Encode PROTO_LIST
  ((unsigned char *, UINT4 *, unsigned int));
static void Decode PROTO_LIST
  ((UINT4 *, unsigned char *, unsigned int));
static void L_MD5_memcpy PROTO_LIST ((POINTER, POINTER, unsigned int));
static void L_MD5_memset PROTO_LIST ((POINTER, int, unsigned int));

static unsigned char PADDING[64] = {
  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
};

/* 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)))

/* ROTATE_LEFT rotates x left n bits.
 */
#ifndef SOURCE
   #define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n))))
#else
   #define ROTATE_LEFT(x, n) (ULSHIFTLEFT32((x),(n)) | ULSHIFTRIGHT32((x), (32-(n))) )
#endif

/* 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) { \
 (a) += F ((b), (c), (d)) + (x) + (UINT4)(ac); \
 (a) = ROTATE_LEFT ((a), (s)); \
 (a) += (b); \
  }
#define GG(a, b, c, d, x, s, ac) { \
 (a) += G ((b), (c), (d)) + (x) + (UINT4)(ac); \
 (a) = ROTATE_LEFT ((a), (s)); \
 (a) += (b); \
  }
#define HH(a, b, c, d, x, s, ac) { \
 (a) += H ((b), (c), (d)) + (x) + (UINT4)(ac); \
 (a) = ROTATE_LEFT ((a), (s)); \
 (a) += (b); \
  }
#define II(a, b, c, d, x, s, ac) { \
 (a) += I ((b), (c), (d)) + (x) + (UINT4)(ac); \
 (a) = ROTATE_LEFT ((a), (s)); \
 (a) += (b); \
  }

/* MD5 initialization. Begins an MD5 operation, writing a new context.
 */
void L_MD5Init (context)
L_MD5_CTX *context;                  /* context */
{
  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 block update operation. Continues an MD5 message-digest
  operation, processing another message block, and updating the
  context.
 */
void L_MD5Update (context, input, inputLen)
L_MD5_CTX *context;                  /* context */
unsigned char *input;                    /* input block */
unsigned int inputLen;             /* length of input block */
{
    unsigned int i, index, partLen;

    /* Compute number of bytes mod 64 */
    index = (unsigned int)( ((UI16)context->count[0] >> 3) & 0x3F);

    /* Update number of bits */
    if ((context->count[0] += ((UINT4)inputLen << 3))  <  ((UINT4)inputLen << 3))
    context->count[1]++;
    context->count[1] += ((UINT4)inputLen >> 29);

    partLen = 64 - index;

    /* Transform as many times as possible.
    */
    if (inputLen >= partLen) {
    L_MD5_memcpy((POINTER)&context->buffer[index], (POINTER)input, partLen);
    L_MD5Transform (context->state, context->buffer);

    for (i = partLen; i + 63 < inputLen; i += 64)
        L_MD5Transform (context->state, &input[i]);

    index = 0;
    } else
    i = 0;

    /* Buffer remaining input */
    L_MD5_memcpy((POINTER)&context->buffer[index], (POINTER)&input[i], inputLen-i);
}


/* MD5 finalization. Ends an MD5 message-digest operation, writing the
    the message digest and zeroizing the context.
 */
void L_MD5Final (digest, context)
unsigned char digest[16];             /* message digest */
L_MD5_CTX *context;                 /* context */
{
    unsigned char bits[8];
    unsigned int index, padLen;

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

    /* Pad out to 56 mod 64.
    */
    index = (unsigned int)(((UI16)context->count[0] >> 3) & 0x3f);
    padLen = (index < 56) ? (56 - index) : (120 - index);
    L_MD5Update (context, PADDING, padLen);

    /* Append length (before padding) */
    L_MD5Update (context, bits, 8);

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

    /* Zeroize sensitive information.
    */
    L_MD5_memset ((POINTER)context, 0, sizeof (*context));
}

/* MD5 basic transformation. Transforms state based on block.
 */
static void L_MD5Transform (state, block)
UINT4 state[4];
unsigned char block[64];
{
    UINT4 a = state[0], b = state[1], c = state[2], d = state[3], x[16];

    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.
    */
    L_MD5_memset ((POINTER)x, 0, sizeof (x));
}

/* Encodes input (UINT4) into output (unsigned char). Assumes len is
  a multiple of 4.
 */
static void Encode (output, input, len)
unsigned char *output;
UINT4 *input;
unsigned int len;
{
    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);
    }
}

/* Decodes input (unsigned char) into output (UINT4). Assumes len is
   a multiple of 4.
 */
static void Decode (output, input, len)
UINT4 *output;
unsigned char *input;
unsigned int len;
{
    unsigned int i, j;

    for (i = 0, j = 0; j < len; i++, j += 4)
    output[i] = ((UINT4)input[j]) | (((UINT4)input[j+1]) << 8) |
            (((UINT4)input[j+2]) << 16) | (((UINT4)input[j+3]) << 24);
}

/* Note: Replace "for loop" with standard memcpy if possible.
 */

static void L_MD5_memcpy (output, input, len)
POINTER output;
POINTER input;
unsigned int len;
{
    unsigned int i;

    for (i = 0; i < len; i++)
    output[i] = input[i];
}


/* Note: Replace "for loop" with standard memset if possible.
 */
static void L_MD5_memset (output, value, len)
POINTER output;
int value;
unsigned int len;
{
    unsigned int i;

    for (i = 0; i < len; i++)
    ((char *)output)[i] = (char)value;
}


/* Digests a string and prints the result.
 */
void L_MD5_MDString (UI8_T *digest, UI8_T *string, UI32_T len)
{
    L_MD5_CTX context;

    L_MD5Init (&context);
    L_MD5Update (&context, string, len);
    L_MD5Final (digest, &context);

#ifdef ADD_It
    printf ("%d(\"%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x\") = ", len, string[0],string[1],
    string[2],string[3],string[4],string[5],string[6],string[7],string[8],string[9],string[10]);

    printf ("%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x\n", digest[0],
    digest[1],digest[2],digest[3],digest[4],digest[5],digest[6],digest[7],digest[8],
    digest[9],digest[10],digest[11],digest[12],digest[13],digest[14],digest[15]);
#endif
}

void L_MD5_MDString_N (UI8_T *digest, UI32_T num_of_string, UI8_T *string[], UI32_T len[])
{
    L_MD5_CTX context;
    UI32_T i;

    L_MD5Init (&context);
    for (i = 0; i < num_of_string; i++)
        L_MD5Update (&context, string[i], len[i]);
    L_MD5Final (digest, &context);
}


/*  FUNCTION NAME : L_MD5_HMAC_MD5
 *  PURPOSE:
 *      Get digest, a 16 octet signature of type HMAC-MD5 created from the date.
 *  INPUT:
 *      data        -- input date for digest
 *      data_len    -- input date length
 *      key         -- input key for digest
 *      key_len     -- input key length
 *
 *  OUTPUT:
 *      digest      -- output digest (16 bytes).
 *
 *  RETURN:
 *      None
 *
 *  NOTES:
 *      None.
 */
void L_MD5_HMAC_MD5(UI8_T               *data,       /* pointer to data stream        */
                    UI32_T              data_len,    /* length of data stream         */
                    UI8_T               *key,        /* pointer to authentication key */
                    UI32_T              key_len,     /* length of authentication key  */
                    UI8_T               *digest)     /* caller digest to be filled in */
{
    L_MD5_CTX       context;
    UI8_T           k_ipad[65];    /* inner padding - key XORd with ipad */
    UI8_T           k_opad[65];    /* outer padding - key XORd with opad */
    UI8_T           tk[16];
    UI32_T          i;

    /* If key is longer than 64 bytes reset it to key=MD5(key) */
    if (key_len > 64)
    {
        L_MD5_CTX      tctx;

        L_MD5Init(&tctx);
        L_MD5Update(&tctx, key, key_len);
        L_MD5Final(tk, &tctx);

        key     = tk;
        key_len = 16;
    }

    /*
     * The HMAC_MD5 transform looks like:
     *
     * MD5(K XOR opad, MD5(K XOR ipad, data))
     *
     * 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 pads */
    memset(k_ipad, 0, sizeof(k_ipad));
    memset(k_opad, 0, sizeof(k_opad));
    memcpy(k_ipad, key, key_len);
    memcpy(k_opad, key, key_len);

    /* XOR key with ipad and opad values */
    for (i=0; i<64; i++)
    {
        k_ipad[i] ^= 0x36;
        k_opad[i] ^= 0x5c;
    }
    /*
     * perform inner MD5
     */
    L_MD5Init(&context);                   /* init context for 1st pass */
    L_MD5Update(&context, k_ipad, 64);     /* start with inner pad      */
    L_MD5Update(&context, data, data_len); /* then text of datagram     */
    L_MD5Final(digest, &context);          /* finish up 1st pass        */
    /*
     * perform outer MD5
     */
    L_MD5Init(&context);                   /* init context for 2nd pass */
    L_MD5Update(&context, k_opad, 64);     /* start with outer pad      */
    L_MD5Update(&context, digest, 16);     /* then results of 1st hash  */
    L_MD5Final(digest, &context);          /* finish up 2nd pass        */
}