/*

 * sha512.c --- The sha512 algorithm

 *

 * Copyright (C) 2004 Sam Hocevar <sam@hocevar.net>

 * (copied from libtomcrypt and then relicensed under GPLv2)

 *

 * %Begin-Header%

 * This file may be redistributed under the terms of the GNU Library

 * General Public License, version 2.

 * %End-Header%

 */

#include "config.h"

#if HAVE_SYS_TYPES_H

#include <sys/types.h>

#endif

#include "ext2fs.h"

/* the K array */

#define CONST64(n) n

static const __u64 K[80] = {

  CONST64(0x428a2f98d728ae22), CONST64(0x7137449123ef65cd),

  CONST64(0xb5c0fbcfec4d3b2f), CONST64(0xe9b5dba58189dbbc),

  CONST64(0x3956c25bf348b538), CONST64(0x59f111f1b605d019),

  CONST64(0x923f82a4af194f9b), CONST64(0xab1c5ed5da6d8118),

  CONST64(0xd807aa98a3030242), CONST64(0x12835b0145706fbe),

  CONST64(0x243185be4ee4b28c), CONST64(0x550c7dc3d5ffb4e2),

  CONST64(0x72be5d74f27b896f), CONST64(0x80deb1fe3b1696b1),

  CONST64(0x9bdc06a725c71235), CONST64(0xc19bf174cf692694),

  CONST64(0xe49b69c19ef14ad2), CONST64(0xefbe4786384f25e3),

  CONST64(0x0fc19dc68b8cd5b5), CONST64(0x240ca1cc77ac9c65),

  CONST64(0x2de92c6f592b0275), CONST64(0x4a7484aa6ea6e483),

  CONST64(0x5cb0a9dcbd41fbd4), CONST64(0x76f988da831153b5),

  CONST64(0x983e5152ee66dfab), CONST64(0xa831c66d2db43210),

  CONST64(0xb00327c898fb213f), CONST64(0xbf597fc7beef0ee4),

  CONST64(0xc6e00bf33da88fc2), CONST64(0xd5a79147930aa725),

  CONST64(0x06ca6351e003826f), CONST64(0x142929670a0e6e70),

  CONST64(0x27b70a8546d22ffc), CONST64(0x2e1b21385c26c926),

  CONST64(0x4d2c6dfc5ac42aed), CONST64(0x53380d139d95b3df),

  CONST64(0x650a73548baf63de), CONST64(0x766a0abb3c77b2a8),

  CONST64(0x81c2c92e47edaee6), CONST64(0x92722c851482353b),

  CONST64(0xa2bfe8a14cf10364), CONST64(0xa81a664bbc423001),

  CONST64(0xc24b8b70d0f89791), CONST64(0xc76c51a30654be30),

  CONST64(0xd192e819d6ef5218), CONST64(0xd69906245565a910),

  CONST64(0xf40e35855771202a), CONST64(0x106aa07032bbd1b8),

  CONST64(0x19a4c116b8d2d0c8), CONST64(0x1e376c085141ab53),

  CONST64(0x2748774cdf8eeb99), CONST64(0x34b0bcb5e19b48a8),

  CONST64(0x391c0cb3c5c95a63), CONST64(0x4ed8aa4ae3418acb),

  CONST64(0x5b9cca4f7763e373), CONST64(0x682e6ff3d6b2b8a3),

  CONST64(0x748f82ee5defb2fc), CONST64(0x78a5636f43172f60),

  CONST64(0x84c87814a1f0ab72), CONST64(0x8cc702081a6439ec),

  CONST64(0x90befffa23631e28), CONST64(0xa4506cebde82bde9),

  CONST64(0xbef9a3f7b2c67915), CONST64(0xc67178f2e372532b),

  CONST64(0xca273eceea26619c), CONST64(0xd186b8c721c0c207),

  CONST64(0xeada7dd6cde0eb1e), CONST64(0xf57d4f7fee6ed178),

  CONST64(0x06f067aa72176fba), CONST64(0x0a637dc5a2c898a6),

  CONST64(0x113f9804bef90dae), CONST64(0x1b710b35131c471b),

  CONST64(0x28db77f523047d84), CONST64(0x32caab7b40c72493),

  CONST64(0x3c9ebe0a15c9bebc), CONST64(0x431d67c49c100d4c),

  CONST64(0x4cc5d4becb3e42b6), CONST64(0x597f299cfc657e2a),

  CONST64(0x5fcb6fab3ad6faec), CONST64(0x6c44198c4a475817)

};

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

#define Maj(x,y,z)      (((x | y) & z) | (x & y))

#define S(x, n)         ROR64c(x, n)

#define R(x, n)         (((x)&CONST64(0xFFFFFFFFFFFFFFFF))>>((__u64)n))

#define Sigma0(x)       (S(x, 28) ^ S(x, 34) ^ S(x, 39))

#define Sigma1(x)       (S(x, 14) ^ S(x, 18) ^ S(x, 41))

#define Gamma0(x)       (S(x, 1) ^ S(x, 8) ^ R(x, 7))

#define Gamma1(x)       (S(x, 19) ^ S(x, 61) ^ R(x, 6))

#define RND(a,b,c,d,e,f,g,h,i)\

    t0 = h + Sigma1(e) + Ch(e, f, g) + K[i] + W[i];\

    t1 = Sigma0(a) + Maj(a, b, c);\

    d += t0;\

    h  = t0 + t1;

#define STORE64H(x, y) \

  do { \

    (y)[0] = (unsigned char)(((x)>>56)&255);\

    (y)[1] = (unsigned char)(((x)>>48)&255);\

    (y)[2] = (unsigned char)(((x)>>40)&255);\

    (y)[3] = (unsigned char)(((x)>>32)&255);\

    (y)[4] = (unsigned char)(((x)>>24)&255);\

    (y)[5] = (unsigned char)(((x)>>16)&255);\

    (y)[6] = (unsigned char)(((x)>>8)&255);\

    (y)[7] = (unsigned char)((x)&255); } while(0)

#define LOAD64H(x, y)\

  do {x = \

    (((__u64)((y)[0] & 255)) << 56) |\

    (((__u64)((y)[1] & 255)) << 48) |\

    (((__u64)((y)[2] & 255)) << 40) |\

    (((__u64)((y)[3] & 255)) << 32) |\

    (((__u64)((y)[4] & 255)) << 24) |\

    (((__u64)((y)[5] & 255)) << 16) |\

    (((__u64)((y)[6] & 255)) << 8) |\

    (((__u64)((y)[7] & 255)));\

  } while(0)

#define ROR64c(x, y) \

    ( ((((x)&CONST64(0xFFFFFFFFFFFFFFFF))>>((__u64)(y)&CONST64(63))) | \

      ((x)<<((__u64)(64-((y)&CONST64(63)))))) & CONST64(0xFFFFFFFFFFFFFFFF))

struct sha512_state {

  __u64  length, state[8];

  unsigned long curlen;

  unsigned char buf[128];

};

/* This is a highly simplified version from libtomcrypt */

struct hash_state {

  struct sha512_state sha512;

};

static void sha512_compress(struct hash_state * md, const unsigned char *buf)

{

  __u64 S[8], W[80], t0, t1;

  int i;

  /* copy state into S */

  for (i = 0; i < 8; i++) {

    S[i] = md->sha512.state[i];

  }

  /* copy the state into 1024-bits into W[0..15] */

  for (i = 0; i < 16; i++) {

    LOAD64H(W[i], buf + (8*i));

  }

  /* fill W[16..79] */

  for (i = 16; i < 80; i++) {

    W[i] = Gamma1(W[i - 2]) + W[i - 7] +

      Gamma0(W[i - 15]) + W[i - 16];

  }

  for (i = 0; i < 80; i += 8) {

    RND(S[0],S[1],S[2],S[3],S[4],S[5],S[6],S[7],i+0);

    RND(S[7],S[0],S[1],S[2],S[3],S[4],S[5],S[6],i+1);

    RND(S[6],S[7],S[0],S[1],S[2],S[3],S[4],S[5],i+2);

    RND(S[5],S[6],S[7],S[0],S[1],S[2],S[3],S[4],i+3);

    RND(S[4],S[5],S[6],S[7],S[0],S[1],S[2],S[3],i+4);

    RND(S[3],S[4],S[5],S[6],S[7],S[0],S[1],S[2],i+5);

    RND(S[2],S[3],S[4],S[5],S[6],S[7],S[0],S[1],i+6);

    RND(S[1],S[2],S[3],S[4],S[5],S[6],S[7],S[0],i+7);

  }

   /* feedback */

  for (i = 0; i < 8; i++) {

    md->sha512.state[i] = md->sha512.state[i] + S[i];

  }

}

static void sha512_init(struct hash_state * md)

{

  md->sha512.curlen = 0;

  md->sha512.length = 0;

  md->sha512.state[0] = CONST64(0x6a09e667f3bcc908);

  md->sha512.state[1] = CONST64(0xbb67ae8584caa73b);

  md->sha512.state[2] = CONST64(0x3c6ef372fe94f82b);

  md->sha512.state[3] = CONST64(0xa54ff53a5f1d36f1);

  md->sha512.state[4] = CONST64(0x510e527fade682d1);

  md->sha512.state[5] = CONST64(0x9b05688c2b3e6c1f);

  md->sha512.state[6] = CONST64(0x1f83d9abfb41bd6b);

  md->sha512.state[7] = CONST64(0x5be0cd19137e2179);

}

static void sha512_done(struct hash_state * md, unsigned char *out)

{

  int i;

  /* increase the length of the message */

  md->sha512.length += md->sha512.curlen * CONST64(8);

  /* append the '1' bit */

  md->sha512.buf[md->sha512.curlen++] = (unsigned char)0x80;

  /* if the length is currently above 112 bytes we append zeros then

   * compress. Then we can fall back to padding zeros and length encoding

   * like normal. */

  if (md->sha512.curlen > 112) {

    while (md->sha512.curlen < 128) {

      md->sha512.buf[md->sha512.curlen++] = (unsigned char)0;

    }

    sha512_compress(md, md->sha512.buf);

    md->sha512.curlen = 0;

  }

  /* pad up to 120 bytes of zeroes note: that from 112 to 120 is the 64 MSB

   * of the length. We assume that you won't hash > 2^64 bits of data. */

  while (md->sha512.curlen < 120) {

    md->sha512.buf[md->sha512.curlen++] = (unsigned char)0;

  }

  /* store length */

  STORE64H(md->sha512.length, md->sha512.buf + 120);

  sha512_compress(md, md->sha512.buf);

  /* copy output */

  for (i = 0; i < 8; i++) {

    STORE64H(md->sha512.state[i], out+(8 * i));

  }

}

#define MIN(x, y) ( ((x)<(y))?(x):(y) )

#define SHA512_BLOCKSIZE 128

static void sha512_process(struct hash_state * md,

         const unsigned char *in,

         unsigned long inlen)

{

  unsigned long n;

  while (inlen > 0) {

    if (md->sha512.curlen == 0 && inlen >= SHA512_BLOCKSIZE) {

      sha512_compress(md, in);

      md->sha512.length += SHA512_BLOCKSIZE * 8;

      in += SHA512_BLOCKSIZE;

      inlen -= SHA512_BLOCKSIZE;

    } else {

      n = MIN(inlen, (SHA512_BLOCKSIZE - md->sha512.curlen));

      memcpy(md->sha512.buf + md->sha512.curlen,

             in, (size_t)n);

      md->sha512.curlen += n;

      in += n;

      inlen -= n;

      if (md->sha512.curlen == SHA512_BLOCKSIZE) {

        sha512_compress(md, md->sha512.buf);

        md->sha512.length += SHA512_BLOCKSIZE * 8;

        md->sha512.curlen = 0;

      }

    }

  }

}

void ext2fs_sha512(const unsigned char *in, unsigned long in_size,

       unsigned char out[EXT2FS_SHA512_LENGTH])

{

  struct hash_state md;

  sha512_init(&md);

  sha512_process(&md, in, in_size);

  sha512_done(&md, out);

}

#ifdef UNITTEST

static const struct {

  char *msg;

  unsigned char hash[64];

} tests[] = {

  { "",

    { 0xcf, 0x83, 0xe1, 0x35, 0x7e, 0xef, 0xb8, 0xbd,

      0xf1, 0x54, 0x28, 0x50, 0xd6, 0x6d, 0x80, 0x07,

      0xd6, 0x20, 0xe4, 0x05, 0x0b, 0x57, 0x15, 0xdc,

      0x83, 0xf4, 0xa9, 0x21, 0xd3, 0x6c, 0xe9, 0xce,

      0x47, 0xd0, 0xd1, 0x3c, 0x5d, 0x85, 0xf2, 0xb0,

      0xff, 0x83, 0x18, 0xd2, 0x87, 0x7e, 0xec, 0x2f,

      0x63, 0xb9, 0x31, 0xbd, 0x47, 0x41, 0x7a, 0x81,

      0xa5, 0x38, 0x32, 0x7a, 0xf9, 0x27, 0xda, 0x3e }

  },

  { "abc",

    { 0xdd, 0xaf, 0x35, 0xa1, 0x93, 0x61, 0x7a, 0xba,

      0xcc, 0x41, 0x73, 0x49, 0xae, 0x20, 0x41, 0x31,

      0x12, 0xe6, 0xfa, 0x4e, 0x89, 0xa9, 0x7e, 0xa2,

      0x0a, 0x9e, 0xee, 0xe6, 0x4b, 0x55, 0xd3, 0x9a,

      0x21, 0x92, 0x99, 0x2a, 0x27, 0x4f, 0xc1, 0xa8,

      0x36, 0xba, 0x3c, 0x23, 0xa3, 0xfe, 0xeb, 0xbd,

      0x45, 0x4d, 0x44, 0x23, 0x64, 0x3c, 0xe8, 0x0e,

      0x2a, 0x9a, 0xc9, 0x4f, 0xa5, 0x4c, 0xa4, 0x9f }

  },

  { "abcdefghbcdefghicdefghijdefghijkefghijklfghijklmghijklmnhijklmnoijklmnopjklmnopqklmnopqrlmnopqrsmnopqrstnopqrstu",

    { 0x8e, 0x95, 0x9b, 0x75, 0xda, 0xe3, 0x13, 0xda,

      0x8c, 0xf4, 0xf7, 0x28, 0x14, 0xfc, 0x14, 0x3f,

      0x8f, 0x77, 0x79, 0xc6, 0xeb, 0x9f, 0x7f, 0xa1,

      0x72, 0x99, 0xae, 0xad, 0xb6, 0x88, 0x90, 0x18,

      0x50, 0x1d, 0x28, 0x9e, 0x49, 0x00, 0xf7, 0xe4,

      0x33, 0x1b, 0x99, 0xde, 0xc4, 0xb5, 0x43, 0x3a,

      0xc7, 0xd3, 0x29, 0xee, 0xb6, 0xdd, 0x26, 0x54,

      0x5e, 0x96, 0xe5, 0x5b, 0x87, 0x4b, 0xe9, 0x09 }

  },

};

int main(int argc, char **argv)

{

  int i;

  int errors = 0;

  unsigned char tmp[64];

  for (i = 0; i < (int)(sizeof(tests) / sizeof(tests[0])); i++) {

    unsigned char *msg = (unsigned char *) tests[i].msg;

    int len = strlen(tests[i].msg);

    ext2fs_sha512(msg, len, tmp);

    printf("SHA512 test message %d: ", i);

    if (memcmp(tmp, tests[i].hash, 64) != 0) {

      printf("FAILED\n");

      errors++;

    } else

      printf("OK\n");

  }

  return errors;

}

#endif /* UNITTEST */