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/*

 ***********************************************************************

 ** md5.c -- the source code for MD5 routines                         **

 ** RSA Data Security, Inc. MD5 Message-Digest Algorithm              **

 ** Created: 2/17/90 RLR                                              **

 ** Revised: 1/91 SRD,AJ,BSK,JT Reference C ver., 7/10 constant corr. **

 ***********************************************************************

 */

/*

 ***********************************************************************

 ** Copyright (C) 1990, RSA Data Security, Inc. 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 "lwip/opt.h"

#if PPP_SUPPORT /* don't build if not configured for use in lwipopts.h */

#if CHAP_SUPPORT || MD5_SUPPORT

#include "ppp.h"

#include "pppdebug.h"

#include "md5.h"

/*

 ***********************************************************************

 **  Message-digest routines:                                         **

 **  To form the message digest for a message M                       **

 **    (1) Initialize a context buffer mdContext using MD5Init        **

 **    (2) Call MD5Update on mdContext and M                          **

 **    (3) Call MD5Final on mdContext                                 **

 **  The message digest is now in mdContext->digest[0...15]           **

 ***********************************************************************

 */

/* forward declaration */

static void Transform (u32_t *buf, u32_t *in);

static unsigned char PADDING[64] = {

  0x80, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,

  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,

  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,

  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,

  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,

  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,

  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,

  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00

};

/* 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 */

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

/* 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) + (u32_t)(ac); \

   (a) = ROTATE_LEFT ((a), (s)); \

   (a) += (b); \

  }

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

  {(a) += G ((b), (c), (d)) + (x) + (u32_t)(ac); \

   (a) = ROTATE_LEFT ((a), (s)); \

   (a) += (b); \

  }

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

  {(a) += H ((b), (c), (d)) + (x) + (u32_t)(ac); \

   (a) = ROTATE_LEFT ((a), (s)); \

   (a) += (b); \

  }

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

  {(a) += I ((b), (c), (d)) + (x) + (u32_t)(ac); \

   (a) = ROTATE_LEFT ((a), (s)); \

   (a) += (b); \

  }

#ifdef __STDC__

#define UL(x) x##UL

#else

#ifdef WIN32

#define UL(x) x##UL

#else

#define UL(x) x

#endif

#endif

/* The routine MD5Init initializes the message-digest context

   mdContext. All fields are set to zero.

 */

void

MD5Init (MD5_CTX *mdContext)

{

  mdContext->i[0] = mdContext->i[1] = (u32_t)0;

  /* Load magic initialization constants. */

  mdContext->buf[0] = (u32_t)0x67452301UL;

  mdContext->buf[1] = (u32_t)0xefcdab89UL;

  mdContext->buf[2] = (u32_t)0x98badcfeUL;

  mdContext->buf[3] = (u32_t)0x10325476UL;

}

/* The routine MD5Update updates the message-digest context to

   account for the presence of each of the characters inBuf[0..inLen-1]

   in the message whose digest is being computed.

 */

void

MD5Update(MD5_CTX *mdContext, unsigned char *inBuf, unsigned int inLen)

{

  u32_t in[16];

  int mdi;

  unsigned int i, ii;

#if 0

  ppp_trace(LOG_INFO, "MD5Update: %u:%.*H\n", inLen, MIN(inLen, 20) * 2, inBuf);

  ppp_trace(LOG_INFO, "MD5Update: %u:%s\n", inLen, inBuf);

#endif

  /* compute number of bytes mod 64 */

  mdi = (int)((mdContext->i[0] >> 3) & 0x3F);

  /* update number of bits */

  if ((mdContext->i[0] + ((u32_t)inLen << 3)) < mdContext->i[0]) {

    mdContext->i[1]++;

  }

  mdContext->i[0] += ((u32_t)inLen << 3);

  mdContext->i[1] += ((u32_t)inLen >> 29);

  while (inLen--) {

    /* add new character to buffer, increment mdi */

    mdContext->in[mdi++] = *inBuf++;

    /* transform if necessary */

    if (mdi == 0x40) {

      for (i = 0, ii = 0; i < 16; i++, ii += 4) {

        in[i] = (((u32_t)mdContext->in[ii+3]) << 24) |

                (((u32_t)mdContext->in[ii+2]) << 16) |

                (((u32_t)mdContext->in[ii+1]) << 8)  |

                ((u32_t)mdContext->in[ii]);

      }

      Transform (mdContext->buf, in);

      mdi = 0;

    }

  }

}

/* The routine MD5Final terminates the message-digest computation and

   ends with the desired message digest in mdContext->digest[0...15].

 */

void

MD5Final (unsigned char hash[], MD5_CTX *mdContext)

{

  u32_t in[16];

  int mdi;

  unsigned int i, ii;

  unsigned int padLen;

  /* save number of bits */

  in[14] = mdContext->i[0];

  in[15] = mdContext->i[1];

  /* compute number of bytes mod 64 */

  mdi = (int)((mdContext->i[0] >> 3) & 0x3F);

  /* pad out to 56 mod 64 */

  padLen = (mdi < 56) ? (56 - mdi) : (120 - mdi);

  MD5Update (mdContext, PADDING, padLen);

  /* append length in bits and transform */

  for (i = 0, ii = 0; i < 14; i++, ii += 4) {

    in[i] = (((u32_t)mdContext->in[ii+3]) << 24) |

            (((u32_t)mdContext->in[ii+2]) << 16) |

            (((u32_t)mdContext->in[ii+1]) << 8)  |

            ((u32_t)mdContext->in[ii]);

  }

  Transform (mdContext->buf, in);

  /* store buffer in digest */

  for (i = 0, ii = 0; i < 4; i++, ii += 4) {

    mdContext->digest[ii]   = (unsigned char)(mdContext->buf[i] & 0xFF);

    mdContext->digest[ii+1] =

      (unsigned char)((mdContext->buf[i] >> 8)  & 0xFF);

    mdContext->digest[ii+2] =

      (unsigned char)((mdContext->buf[i] >> 16) & 0xFF);

    mdContext->digest[ii+3] =

      (unsigned char)((mdContext->buf[i] >> 24) & 0xFF);

  }

  SMEMCPY(hash, mdContext->digest, 16);

}

/* Basic MD5 step. Transforms buf based on in.

 */

static void

Transform (u32_t *buf, u32_t *in)

{

  u32_t a = buf[0], b = buf[1], c = buf[2], d = buf[3];

  /* Round 1 */

#define S11 7

#define S12 12

#define S13 17

#define S14 22

  FF ( a, b, c, d, in[ 0], S11, UL(3614090360)); /* 1 */

  FF ( d, a, b, c, in[ 1], S12, UL(3905402710)); /* 2 */

  FF ( c, d, a, b, in[ 2], S13, UL( 606105819)); /* 3 */

  FF ( b, c, d, a, in[ 3], S14, UL(3250441966)); /* 4 */

  FF ( a, b, c, d, in[ 4], S11, UL(4118548399)); /* 5 */

  FF ( d, a, b, c, in[ 5], S12, UL(1200080426)); /* 6 */

  FF ( c, d, a, b, in[ 6], S13, UL(2821735955)); /* 7 */

  FF ( b, c, d, a, in[ 7], S14, UL(4249261313)); /* 8 */

  FF ( a, b, c, d, in[ 8], S11, UL(1770035416)); /* 9 */

  FF ( d, a, b, c, in[ 9], S12, UL(2336552879)); /* 10 */

  FF ( c, d, a, b, in[10], S13, UL(4294925233)); /* 11 */

  FF ( b, c, d, a, in[11], S14, UL(2304563134)); /* 12 */

  FF ( a, b, c, d, in[12], S11, UL(1804603682)); /* 13 */

  FF ( d, a, b, c, in[13], S12, UL(4254626195)); /* 14 */

  FF ( c, d, a, b, in[14], S13, UL(2792965006)); /* 15 */

  FF ( b, c, d, a, in[15], S14, UL(1236535329)); /* 16 */

  /* Round 2 */

#define S21 5

#define S22 9

#define S23 14

#define S24 20

  GG ( a, b, c, d, in[ 1], S21, UL(4129170786)); /* 17 */

  GG ( d, a, b, c, in[ 6], S22, UL(3225465664)); /* 18 */

  GG ( c, d, a, b, in[11], S23, UL( 643717713)); /* 19 */

  GG ( b, c, d, a, in[ 0], S24, UL(3921069994)); /* 20 */

  GG ( a, b, c, d, in[ 5], S21, UL(3593408605)); /* 21 */

  GG ( d, a, b, c, in[10], S22, UL(  38016083)); /* 22 */

  GG ( c, d, a, b, in[15], S23, UL(3634488961)); /* 23 */

  GG ( b, c, d, a, in[ 4], S24, UL(3889429448)); /* 24 */

  GG ( a, b, c, d, in[ 9], S21, UL( 568446438)); /* 25 */

  GG ( d, a, b, c, in[14], S22, UL(3275163606)); /* 26 */

  GG ( c, d, a, b, in[ 3], S23, UL(4107603335)); /* 27 */

  GG ( b, c, d, a, in[ 8], S24, UL(1163531501)); /* 28 */

  GG ( a, b, c, d, in[13], S21, UL(2850285829)); /* 29 */

  GG ( d, a, b, c, in[ 2], S22, UL(4243563512)); /* 30 */

  GG ( c, d, a, b, in[ 7], S23, UL(1735328473)); /* 31 */

  GG ( b, c, d, a, in[12], S24, UL(2368359562)); /* 32 */

  /* Round 3 */

#define S31 4

#define S32 11

#define S33 16

#define S34 23

  HH ( a, b, c, d, in[ 5], S31, UL(4294588738)); /* 33 */

  HH ( d, a, b, c, in[ 8], S32, UL(2272392833)); /* 34 */

  HH ( c, d, a, b, in[11], S33, UL(1839030562)); /* 35 */

  HH ( b, c, d, a, in[14], S34, UL(4259657740)); /* 36 */

  HH ( a, b, c, d, in[ 1], S31, UL(2763975236)); /* 37 */

  HH ( d, a, b, c, in[ 4], S32, UL(1272893353)); /* 38 */

  HH ( c, d, a, b, in[ 7], S33, UL(4139469664)); /* 39 */

  HH ( b, c, d, a, in[10], S34, UL(3200236656)); /* 40 */

  HH ( a, b, c, d, in[13], S31, UL( 681279174)); /* 41 */

  HH ( d, a, b, c, in[ 0], S32, UL(3936430074)); /* 42 */

  HH ( c, d, a, b, in[ 3], S33, UL(3572445317)); /* 43 */

  HH ( b, c, d, a, in[ 6], S34, UL(  76029189)); /* 44 */

  HH ( a, b, c, d, in[ 9], S31, UL(3654602809)); /* 45 */

  HH ( d, a, b, c, in[12], S32, UL(3873151461)); /* 46 */

  HH ( c, d, a, b, in[15], S33, UL( 530742520)); /* 47 */

  HH ( b, c, d, a, in[ 2], S34, UL(3299628645)); /* 48 */

  /* Round 4 */

#define S41 6

#define S42 10

#define S43 15

#define S44 21

  II ( a, b, c, d, in[ 0], S41, UL(4096336452)); /* 49 */

  II ( d, a, b, c, in[ 7], S42, UL(1126891415)); /* 50 */

  II ( c, d, a, b, in[14], S43, UL(2878612391)); /* 51 */

  II ( b, c, d, a, in[ 5], S44, UL(4237533241)); /* 52 */

  II ( a, b, c, d, in[12], S41, UL(1700485571)); /* 53 */

  II ( d, a, b, c, in[ 3], S42, UL(2399980690)); /* 54 */

  II ( c, d, a, b, in[10], S43, UL(4293915773)); /* 55 */

  II ( b, c, d, a, in[ 1], S44, UL(2240044497)); /* 56 */

  II ( a, b, c, d, in[ 8], S41, UL(1873313359)); /* 57 */

  II ( d, a, b, c, in[15], S42, UL(4264355552)); /* 58 */

  II ( c, d, a, b, in[ 6], S43, UL(2734768916)); /* 59 */

  II ( b, c, d, a, in[13], S44, UL(1309151649)); /* 60 */

  II ( a, b, c, d, in[ 4], S41, UL(4149444226)); /* 61 */

  II ( d, a, b, c, in[11], S42, UL(3174756917)); /* 62 */

  II ( c, d, a, b, in[ 2], S43, UL( 718787259)); /* 63 */

  II ( b, c, d, a, in[ 9], S44, UL(3951481745)); /* 64 */

  buf[0] += a;

  buf[1] += b;

  buf[2] += c;

  buf[3] += d;

}

#endif /* CHAP_SUPPORT || MD5_SUPPORT */

#endif /* PPP_SUPPORT */