text: /* SHA256 module */
  
  /* This module provides an interface to NIST's SHA-256 and SHA-224 Algorithms */
  
  /* See below for information about the original code this module was
     based upon. Additional work performed by:
  
     Andrew Kuchling (amk@amk.ca)
     Greg Stein (gstein@lyra.org)
     Trevor Perrin (trevp@trevp.net)
  
     Copyright (C) 2005-2007   Gregory P. Smith (greg@krypto.org)
     Licensed to PSF under a Contributor Agreement.
  
  */
  
  /* SHA objects */
  
  #include "Python.h"
  #include "structmember.h"
  #include "hashlib.h"
  #include "pystrhex.h"
  
  /*[clinic input]
  module _sha256
  class SHA256Type "SHAobject *" "&PyType_Type"
  [clinic start generated code]*/
  /*[clinic end generated code: output=da39a3ee5e6b4b0d input=71a39174d4f0a744]*/
  
  /* Some useful types */
  
  typedef unsigned char SHA_BYTE;
  
  #if SIZEOF_INT == 4
  typedef unsigned int SHA_INT32; /* 32-bit integer */
  #else
  /* not defined. compilation will die. */
  #endif
  
  /* The SHA block size and message digest sizes, in bytes */
  
  #define SHA_BLOCKSIZE    64
  #define SHA_DIGESTSIZE  32
  
  /* The structure for storing SHA info */
  
  typedef struct {
      PyObject_HEAD
      SHA_INT32 digest[8];                /* Message digest */
      SHA_INT32 count_lo, count_hi;       /* 64-bit bit count */
      SHA_BYTE data[SHA_BLOCKSIZE];       /* SHA data buffer */
      int local;                          /* unprocessed amount in data */
      int digestsize;
  } SHAobject;
  
  #include "clinic/sha256module.c.h"
  
  /* When run on a little-endian CPU we need to perform byte reversal on an
     array of longwords. */
  
  #if PY_LITTLE_ENDIAN
  static void longReverse(SHA_INT32 *buffer, int byteCount)
  {
      SHA_INT32 value;
  
      byteCount /= sizeof(*buffer);
      while (byteCount--) {
          value = *buffer;
          value = ( ( value & 0xFF00FF00L ) >> 8  ) | \
                  ( ( value & 0x00FF00FFL ) << 8 );
          *buffer++ = ( value << 16 ) | ( value >> 16 );
      }
  }
  #endif
  
  static void SHAcopy(SHAobject *src, SHAobject *dest)
  {
      dest->local = src->local;
      dest->digestsize = src->digestsize;
      dest->count_lo = src->count_lo;
      dest->count_hi = src->count_hi;
      memcpy(dest->digest, src->digest, sizeof(src->digest));
      memcpy(dest->data, src->data, sizeof(src->data));
  }
  
  
  /* ------------------------------------------------------------------------
   *
   * This code for the SHA-256 algorithm was noted as public domain. The
   * original headers are pasted below.
   *
   * Several changes have been made to make it more compatible with the
   * Python environment and desired interface.
   *
   */
  
  /* LibTomCrypt, modular cryptographic library -- Tom St Denis
   *
   * LibTomCrypt is a library that provides various cryptographic
   * algorithms in a highly modular and flexible manner.
   *
   * The library is free for all purposes without any express
   * guarantee it works.
   *
   * Tom St Denis, tomstdenis@iahu.ca, http://libtom.org
   */
  
  
  /* SHA256 by Tom St Denis */
  
  /* Various logical functions */
  #define ROR(x, y)\
  ( ((((unsigned long)(x)&0xFFFFFFFFUL)>>(unsigned long)((y)&31)) | \
  ((unsigned long)(x)<<(unsigned long)(32-((y)&31)))) & 0xFFFFFFFFUL)
  #define Ch(x,y,z)       (z ^ (x & (y ^ z)))
  #define Maj(x,y,z)      (((x | y) & z) | (x & y))
  #define S(x, n)         ROR((x),(n))
  #define R(x, n)         (((x)&0xFFFFFFFFUL)>>(n))
  #define Sigma0(x)       (S(x, 2) ^ S(x, 13) ^ S(x, 22))
  #define Sigma1(x)       (S(x, 6) ^ S(x, 11) ^ S(x, 25))
  #define Gamma0(x)       (S(x, 7) ^ S(x, 18) ^ R(x, 3))
  #define Gamma1(x)       (S(x, 17) ^ S(x, 19) ^ R(x, 10))
  
  
  static void
  sha_transform(SHAobject *sha_info)
  {
      int i;
          SHA_INT32 S[8], W[64], t0, t1;
  
      memcpy(W, sha_info->data, sizeof(sha_info->data));
  #if PY_LITTLE_ENDIAN
      longReverse(W, (int)sizeof(sha_info->data));
  #endif
  
      for (i = 16; i < 64; ++i) {
                  W[i] = Gamma1(W[i - 2]) + W[i - 7] + Gamma0(W[i - 15]) + W[i - 16];
      }
      for (i = 0; i < 8; ++i) {
          S[i] = sha_info->digest[i];
      }
  
      /* Compress */
  #define RND(a,b,c,d,e,f,g,h,i,ki)                    \
       t0 = h + Sigma1(e) + Ch(e, f, g) + ki + W[i];   \
       t1 = Sigma0(a) + Maj(a, b, c);                  \
       d += t0;                                        \
       h  = t0 + t1;
  
      RND(S[0],S[1],S[2],S[3],S[4],S[5],S[6],S[7],0,0x428a2f98);
      RND(S[7],S[0],S[1],S[2],S[3],S[4],S[5],S[6],1,0x71374491);
      RND(S[6],S[7],S[0],S[1],S[2],S[3],S[4],S[5],2,0xb5c0fbcf);
      RND(S[5],S[6],S[7],S[0],S[1],S[2],S[3],S[4],3,0xe9b5dba5);
      RND(S[4],S[5],S[6],S[7],S[0],S[1],S[2],S[3],4,0x3956c25b);
      RND(S[3],S[4],S[5],S[6],S[7],S[0],S[1],S[2],5,0x59f111f1);
      RND(S[2],S[3],S[4],S[5],S[6],S[7],S[0],S[1],6,0x923f82a4);
      RND(S[1],S[2],S[3],S[4],S[5],S[6],S[7],S[0],7,0xab1c5ed5);
      RND(S[0],S[1],S[2],S[3],S[4],S[5],S[6],S[7],8,0xd807aa98);
      RND(S[7],S[0],S[1],S[2],S[3],S[4],S[5],S[6],9,0x12835b01);
      RND(S[6],S[7],S[0],S[1],S[2],S[3],S[4],S[5],10,0x243185be);
      RND(S[5],S[6],S[7],S[0],S[1],S[2],S[3],S[4],11,0x550c7dc3);
      RND(S[4],S[5],S[6],S[7],S[0],S[1],S[2],S[3],12,0x72be5d74);
      RND(S[3],S[4],S[5],S[6],S[7],S[0],S[1],S[2],13,0x80deb1fe);
      RND(S[2],S[3],S[4],S[5],S[6],S[7],S[0],S[1],14,0x9bdc06a7);
      RND(S[1],S[2],S[3],S[4],S[5],S[6],S[7],S[0],15,0xc19bf174);
      RND(S[0],S[1],S[2],S[3],S[4],S[5],S[6],S[7],16,0xe49b69c1);
      RND(S[7],S[0],S[1],S[2],S[3],S[4],S[5],S[6],17,0xefbe4786);
      RND(S[6],S[7],S[0],S[1],S[2],S[3],S[4],S[5],18,0x0fc19dc6);
      RND(S[5],S[6],S[7],S[0],S[1],S[2],S[3],S[4],19,0x240ca1cc);
      RND(S[4],S[5],S[6],S[7],S[0],S[1],S[2],S[3],20,0x2de92c6f);
      RND(S[3],S[4],S[5],S[6],S[7],S[0],S[1],S[2],21,0x4a7484aa);
      RND(S[2],S[3],S[4],S[5],S[6],S[7],S[0],S[1],22,0x5cb0a9dc);
      RND(S[1],S[2],S[3],S[4],S[5],S[6],S[7],S[0],23,0x76f988da);
      RND(S[0],S[1],S[2],S[3],S[4],S[5],S[6],S[7],24,0x983e5152);
      RND(S[7],S[0],S[1],S[2],S[3],S[4],S[5],S[6],25,0xa831c66d);
      RND(S[6],S[7],S[0],S[1],S[2],S[3],S[4],S[5],26,0xb00327c8);
      RND(S[5],S[6],S[7],S[0],S[1],S[2],S[3],S[4],27,0xbf597fc7);
      RND(S[4],S[5],S[6],S[7],S[0],S[1],S[2],S[3],28,0xc6e00bf3);
      RND(S[3],S[4],S[5],S[6],S[7],S[0],S[1],S[2],29,0xd5a79147);
      RND(S[2],S[3],S[4],S[5],S[6],S[7],S[0],S[1],30,0x06ca6351);
      RND(S[1],S[2],S[3],S[4],S[5],S[6],S[7],S[0],31,0x14292967);
      RND(S[0],S[1],S[2],S[3],S[4],S[5],S[6],S[7],32,0x27b70a85);
      RND(S[7],S[0],S[1],S[2],S[3],S[4],S[5],S[6],33,0x2e1b2138);
      RND(S[6],S[7],S[0],S[1],S[2],S[3],S[4],S[5],34,0x4d2c6dfc);
      RND(S[5],S[6],S[7],S[0],S[1],S[2],S[3],S[4],35,0x53380d13);
      RND(S[4],S[5],S[6],S[7],S[0],S[1],S[2],S[3],36,0x650a7354);
      RND(S[3],S[4],S[5],S[6],S[7],S[0],S[1],S[2],37,0x766a0abb);
      RND(S[2],S[3],S[4],S[5],S[6],S[7],S[0],S[1],38,0x81c2c92e);
      RND(S[1],S[2],S[3],S[4],S[5],S[6],S[7],S[0],39,0x92722c85);
      RND(S[0],S[1],S[2],S[3],S[4],S[5],S[6],S[7],40,0xa2bfe8a1);
      RND(S[7],S[0],S[1],S[2],S[3],S[4],S[5],S[6],41,0xa81a664b);
      RND(S[6],S[7],S[0],S[1],S[2],S[3],S[4],S[5],42,0xc24b8b70);
      RND(S[5],S[6],S[7],S[0],S[1],S[2],S[3],S[4],43,0xc76c51a3);
      RND(S[4],S[5],S[6],S[7],S[0],S[1],S[2],S[3],44,0xd192e819);
      RND(S[3],S[4],S[5],S[6],S[7],S[0],S[1],S[2],45,0xd6990624);
      RND(S[2],S[3],S[4],S[5],S[6],S[7],S[0],S[1],46,0xf40e3585);
      RND(S[1],S[2],S[3],S[4],S[5],S[6],S[7],S[0],47,0x106aa070);
      RND(S[0],S[1],S[2],S[3],S[4],S[5],S[6],S[7],48,0x19a4c116);
      RND(S[7],S[0],S[1],S[2],S[3],S[4],S[5],S[6],49,0x1e376c08);
      RND(S[6],S[7],S[0],S[1],S[2],S[3],S[4],S[5],50,0x2748774c);
      RND(S[5],S[6],S[7],S[0],S[1],S[2],S[3],S[4],51,0x34b0bcb5);
      RND(S[4],S[5],S[6],S[7],S[0],S[1],S[2],S[3],52,0x391c0cb3);
      RND(S[3],S[4],S[5],S[6],S[7],S[0],S[1],S[2],53,0x4ed8aa4a);
      RND(S[2],S[3],S[4],S[5],S[6],S[7],S[0],S[1],54,0x5b9cca4f);
      RND(S[1],S[2],S[3],S[4],S[5],S[6],S[7],S[0],55,0x682e6ff3);
      RND(S[0],S[1],S[2],S[3],S[4],S[5],S[6],S[7],56,0x748f82ee);
      RND(S[7],S[0],S[1],S[2],S[3],S[4],S[5],S[6],57,0x78a5636f);
      RND(S[6],S[7],S[0],S[1],S[2],S[3],S[4],S[5],58,0x84c87814);
      RND(S[5],S[6],S[7],S[0],S[1],S[2],S[3],S[4],59,0x8cc70208);
      RND(S[4],S[5],S[6],S[7],S[0],S[1],S[2],S[3],60,0x90befffa);
      RND(S[3],S[4],S[5],S[6],S[7],S[0],S[1],S[2],61,0xa4506ceb);
      RND(S[2],S[3],S[4],S[5],S[6],S[7],S[0],S[1],62,0xbef9a3f7);
      RND(S[1],S[2],S[3],S[4],S[5],S[6],S[7],S[0],63,0xc67178f2);
  
  #undef RND
  
      /* feedback */
      for (i = 0; i < 8; i++) {
          sha_info->digest[i] = sha_info->digest[i] + S[i];
      }
  
  }
  
  
  
  /* initialize the SHA digest */
  
  static void
  sha_init(SHAobject *sha_info)
  {
      sha_info->digest[0] = 0x6A09E667L;
      sha_info->digest[1] = 0xBB67AE85L;
      sha_info->digest[2] = 0x3C6EF372L;
      sha_info->digest[3] = 0xA54FF53AL;
      sha_info->digest[4] = 0x510E527FL;
      sha_info->digest[5] = 0x9B05688CL;
      sha_info->digest[6] = 0x1F83D9ABL;
      sha_info->digest[7] = 0x5BE0CD19L;
      sha_info->count_lo = 0L;
      sha_info->count_hi = 0L;
      sha_info->local = 0;
      sha_info->digestsize = 32;
  }
  
  static void
  sha224_init(SHAobject *sha_info)
  {
      sha_info->digest[0] = 0xc1059ed8L;
      sha_info->digest[1] = 0x367cd507L;
      sha_info->digest[2] = 0x3070dd17L;
      sha_info->digest[3] = 0xf70e5939L;
      sha_info->digest[4] = 0xffc00b31L;
      sha_info->digest[5] = 0x68581511L;
      sha_info->digest[6] = 0x64f98fa7L;
      sha_info->digest[7] = 0xbefa4fa4L;
      sha_info->count_lo = 0L;
      sha_info->count_hi = 0L;
      sha_info->local = 0;
      sha_info->digestsize = 28;
  }
  
  
  /* update the SHA digest */
  
  static void
  sha_update(SHAobject *sha_info, SHA_BYTE *buffer, Py_ssize_t count)
  {
      Py_ssize_t i;
      SHA_INT32 clo;
  
      clo = sha_info->count_lo + ((SHA_INT32) count << 3);
      if (clo < sha_info->count_lo) {
          ++sha_info->count_hi;
      }
      sha_info->count_lo = clo;
      sha_info->count_hi += (SHA_INT32) count >> 29;
      if (sha_info->local) {
          i = SHA_BLOCKSIZE - sha_info->local;
          if (i > count) {
              i = count;
          }
          memcpy(((SHA_BYTE *) sha_info->data) + sha_info->local, buffer, i);
          count -= i;
          buffer += i;
          sha_info->local += (int)i;
          if (sha_info->local == SHA_BLOCKSIZE) {
              sha_transform(sha_info);
          }
          else {
              return;
          }
      }
      while (count >= SHA_BLOCKSIZE) {
          memcpy(sha_info->data, buffer, SHA_BLOCKSIZE);
          buffer += SHA_BLOCKSIZE;
          count -= SHA_BLOCKSIZE;
          sha_transform(sha_info);
      }
      memcpy(sha_info->data, buffer, count);
      sha_info->local = (int)count;
  }
  
  /* finish computing the SHA digest */
  
  static void
  sha_final(unsigned char digest[SHA_DIGESTSIZE], SHAobject *sha_info)
  {
      int count;
      SHA_INT32 lo_bit_count, hi_bit_count;
  
      lo_bit_count = sha_info->count_lo;
      hi_bit_count = sha_info->count_hi;
      count = (int) ((lo_bit_count >> 3) & 0x3f);
      ((SHA_BYTE *) sha_info->data)[count++] = 0x80;
      if (count > SHA_BLOCKSIZE - 8) {
          memset(((SHA_BYTE *) sha_info->data) + count, 0,
                 SHA_BLOCKSIZE - count);
          sha_transform(sha_info);
          memset((SHA_BYTE *) sha_info->data, 0, SHA_BLOCKSIZE - 8);
      }
      else {
          memset(((SHA_BYTE *) sha_info->data) + count, 0,
                 SHA_BLOCKSIZE - 8 - count);
      }
  
      /* GJS: note that we add the hi/lo in big-endian. sha_transform will
         swap these values into host-order. */
      sha_info->data[56] = (hi_bit_count >> 24) & 0xff;
      sha_info->data[57] = (hi_bit_count >> 16) & 0xff;
      sha_info->data[58] = (hi_bit_count >>  8) & 0xff;
      sha_info->data[59] = (hi_bit_count >>  0) & 0xff;
      sha_info->data[60] = (lo_bit_count >> 24) & 0xff;
      sha_info->data[61] = (lo_bit_count >> 16) & 0xff;
      sha_info->data[62] = (lo_bit_count >>  8) & 0xff;
      sha_info->data[63] = (lo_bit_count >>  0) & 0xff;
      sha_transform(sha_info);
      digest[ 0] = (unsigned char) ((sha_info->digest[0] >> 24) & 0xff);
      digest[ 1] = (unsigned char) ((sha_info->digest[0] >> 16) & 0xff);
      digest[ 2] = (unsigned char) ((sha_info->digest[0] >>  8) & 0xff);
      digest[ 3] = (unsigned char) ((sha_info->digest[0]      ) & 0xff);
      digest[ 4] = (unsigned char) ((sha_info->digest[1] >> 24) & 0xff);
      digest[ 5] = (unsigned char) ((sha_info->digest[1] >> 16) & 0xff);
      digest[ 6] = (unsigned char) ((sha_info->digest[1] >>  8) & 0xff);
      digest[ 7] = (unsigned char) ((sha_info->digest[1]      ) & 0xff);
      digest[ 8] = (unsigned char) ((sha_info->digest[2] >> 24) & 0xff);
      digest[ 9] = (unsigned char) ((sha_info->digest[2] >> 16) & 0xff);
      digest[10] = (unsigned char) ((sha_info->digest[2] >>  8) & 0xff);
      digest[11] = (unsigned char) ((sha_info->digest[2]      ) & 0xff);
      digest[12] = (unsigned char) ((sha_info->digest[3] >> 24) & 0xff);
      digest[13] = (unsigned char) ((sha_info->digest[3] >> 16) & 0xff);
      digest[14] = (unsigned char) ((sha_info->digest[3] >>  8) & 0xff);
      digest[15] = (unsigned char) ((sha_info->digest[3]      ) & 0xff);
      digest[16] = (unsigned char) ((sha_info->digest[4] >> 24) & 0xff);
      digest[17] = (unsigned char) ((sha_info->digest[4] >> 16) & 0xff);
      digest[18] = (unsigned char) ((sha_info->digest[4] >>  8) & 0xff);
      digest[19] = (unsigned char) ((sha_info->digest[4]      ) & 0xff);
      digest[20] = (unsigned char) ((sha_info->digest[5] >> 24) & 0xff);
      digest[21] = (unsigned char) ((sha_info->digest[5] >> 16) & 0xff);
      digest[22] = (unsigned char) ((sha_info->digest[5] >>  8) & 0xff);
      digest[23] = (unsigned char) ((sha_info->digest[5]      ) & 0xff);
      digest[24] = (unsigned char) ((sha_info->digest[6] >> 24) & 0xff);
      digest[25] = (unsigned char) ((sha_info->digest[6] >> 16) & 0xff);
      digest[26] = (unsigned char) ((sha_info->digest[6] >>  8) & 0xff);
      digest[27] = (unsigned char) ((sha_info->digest[6]      ) & 0xff);
      digest[28] = (unsigned char) ((sha_info->digest[7] >> 24) & 0xff);
      digest[29] = (unsigned char) ((sha_info->digest[7] >> 16) & 0xff);
      digest[30] = (unsigned char) ((sha_info->digest[7] >>  8) & 0xff);
      digest[31] = (unsigned char) ((sha_info->digest[7]      ) & 0xff);
  }
  
  /*
   * End of copied SHA code.
   *
   * ------------------------------------------------------------------------
   */
  
  static PyTypeObject SHA224type;
  static PyTypeObject SHA256type;
  
  
  static SHAobject *
  newSHA224object(void)
  {
      return (SHAobject *)PyObject_New(SHAobject, &SHA224type);
  }
  
  static SHAobject *
  newSHA256object(void)
  {
      return (SHAobject *)PyObject_New(SHAobject, &SHA256type);
  }
  
  /* Internal methods for a hash object */
  
  static void
  SHA_dealloc(PyObject *ptr)
  {
      PyObject_Del(ptr);
  }
  
  
  /* External methods for a hash object */
  
  /*[clinic input]
  SHA256Type.copy
  
  Return a copy of the hash object.
  [clinic start generated code]*/
  
  static PyObject *
  SHA256Type_copy_impl(SHAobject *self)
  /*[clinic end generated code: output=1a8bbd66a0c9c168 input=f58840a618d4f2a7]*/
  {
      SHAobject *newobj;
  
      if (Py_TYPE(self) == &SHA256type) {
          if ( (newobj = newSHA256object())==NULL)
              return NULL;
      } else {
          if ( (newobj = newSHA224object())==NULL)
              return NULL;
      }
  
      SHAcopy(self, newobj);
      return (PyObject *)newobj;
  }
  
  /*[clinic input]
  SHA256Type.digest
  
  Return the digest value as a string of binary data.
  [clinic start generated code]*/
  
  static PyObject *
  SHA256Type_digest_impl(SHAobject *self)
  /*[clinic end generated code: output=46616a5e909fbc3d input=1fb752e58954157d]*/
  {
      unsigned char digest[SHA_DIGESTSIZE];
      SHAobject temp;
  
      SHAcopy(self, &temp);
      sha_final(digest, &temp);
      return PyBytes_FromStringAndSize((const char *)digest, self->digestsize);
  }
  
  /*[clinic input]
  SHA256Type.hexdigest
  
  Return the digest value as a string of hexadecimal digits.
  [clinic start generated code]*/
  
  static PyObject *
  SHA256Type_hexdigest_impl(SHAobject *self)
  /*[clinic end generated code: output=725f8a7041ae97f3 input=0cc4c714693010d1]*/
  {
      unsigned char digest[SHA_DIGESTSIZE];
      SHAobject temp;
  
      /* Get the raw (binary) digest value */
      SHAcopy(self, &temp);
      sha_final(digest, &temp);
  
      return _Py_strhex((const char *)digest, self->digestsize);
  }
  
  /*[clinic input]
  SHA256Type.update
  
      obj: object
      /
  
  Update this hash object's state with the provided string.
  [clinic start generated code]*/
  
  static PyObject *
  SHA256Type_update(SHAobject *self, PyObject *obj)
  /*[clinic end generated code: output=0967fb2860c66af7 input=b2d449d5b30f0f5a]*/
  {
      Py_buffer buf;
  
      GET_BUFFER_VIEW_OR_ERROUT(obj, &buf);
  
      sha_update(self, buf.buf, buf.len);
  
      PyBuffer_Release(&buf);
      Py_RETURN_NONE;
  }
  
  static PyMethodDef SHA_methods[] = {
      SHA256TYPE_COPY_METHODDEF
      SHA256TYPE_DIGEST_METHODDEF
      SHA256TYPE_HEXDIGEST_METHODDEF
      SHA256TYPE_UPDATE_METHODDEF
      {NULL,        NULL}         /* sentinel */
  };
  
  static PyObject *
  SHA256_get_block_size(PyObject *self, void *closure)
  {
      return PyLong_FromLong(SHA_BLOCKSIZE);
  }
  
  static PyObject *
  SHA256_get_name(PyObject *self, void *closure)
  {
      if (((SHAobject *)self)->digestsize == 32)
          return PyUnicode_FromStringAndSize("sha256", 6);
      else
          return PyUnicode_FromStringAndSize("sha224", 6);
  }
  
  static PyGetSetDef SHA_getseters[] = {
      {"block_size",
       (getter)SHA256_get_block_size, NULL,
       NULL,
       NULL},
      {"name",
       (getter)SHA256_get_name, NULL,
       NULL,
       NULL},
      {NULL}  /* Sentinel */
  };
  
  static PyMemberDef SHA_members[] = {
      {"digest_size", T_INT, offsetof(SHAobject, digestsize), READONLY, NULL},
      {NULL}  /* Sentinel */
  };
  
  static PyTypeObject SHA224type = {
      PyVarObject_HEAD_INIT(NULL, 0)
      "_sha256.sha224",   /*tp_name*/
      sizeof(SHAobject),  /*tp_basicsize*/
      0,                  /*tp_itemsize*/
      /* methods */
      SHA_dealloc,        /*tp_dealloc*/
      0,                  /*tp_print*/
      0,                  /*tp_getattr*/
      0,                  /*tp_setattr*/
      0,                  /*tp_reserved*/
      0,                  /*tp_repr*/
      0,                  /*tp_as_number*/
      0,                  /*tp_as_sequence*/
      0,                  /*tp_as_mapping*/
      0,                  /*tp_hash*/
      0,                  /*tp_call*/
      0,                  /*tp_str*/
      0,                  /*tp_getattro*/
      0,                  /*tp_setattro*/
      0,                  /*tp_as_buffer*/
      Py_TPFLAGS_DEFAULT, /*tp_flags*/
      0,                  /*tp_doc*/
      0,                  /*tp_traverse*/
      0,                  /*tp_clear*/
      0,                  /*tp_richcompare*/
      0,                  /*tp_weaklistoffset*/
      0,                  /*tp_iter*/
      0,                  /*tp_iternext*/
      SHA_methods,        /* tp_methods */
      SHA_members,        /* tp_members */
      SHA_getseters,      /* tp_getset */
  };
  
  static PyTypeObject SHA256type = {
      PyVarObject_HEAD_INIT(NULL, 0)
      "_sha256.sha256",   /*tp_name*/
      sizeof(SHAobject),  /*tp_basicsize*/
      0,                  /*tp_itemsize*/
      /* methods */
      SHA_dealloc,        /*tp_dealloc*/
      0,                  /*tp_print*/
      0,                  /*tp_getattr*/
      0,                  /*tp_setattr*/
      0,                  /*tp_reserved*/
      0,                  /*tp_repr*/
      0,                  /*tp_as_number*/
      0,                  /*tp_as_sequence*/
      0,                  /*tp_as_mapping*/
      0,                  /*tp_hash*/
      0,                  /*tp_call*/
      0,                  /*tp_str*/
      0,                  /*tp_getattro*/
      0,                  /*tp_setattro*/
      0,                  /*tp_as_buffer*/
      Py_TPFLAGS_DEFAULT, /*tp_flags*/
      0,                  /*tp_doc*/
      0,                  /*tp_traverse*/
      0,                  /*tp_clear*/
      0,                  /*tp_richcompare*/
      0,                  /*tp_weaklistoffset*/
      0,                  /*tp_iter*/
      0,                  /*tp_iternext*/
      SHA_methods,        /* tp_methods */
      SHA_members,        /* tp_members */
      SHA_getseters,      /* tp_getset */
  };
  
  
  /* The single module-level function: new() */
  
  /*[clinic input]
  _sha256.sha256
  
      string: object(c_default="NULL") = b''
  
  Return a new SHA-256 hash object; optionally initialized with a string.
  [clinic start generated code]*/
  
  static PyObject *
  _sha256_sha256_impl(PyObject *module, PyObject *string)
  /*[clinic end generated code: output=fa644436dcea5c31 input=09cce3fb855056b2]*/
  {
      SHAobject *new;
      Py_buffer buf;
  
      if (string)
          GET_BUFFER_VIEW_OR_ERROUT(string, &buf);
  
      if ((new = newSHA256object()) == NULL) {
          if (string)
              PyBuffer_Release(&buf);
          return NULL;
      }
  
      sha_init(new);
  
      if (PyErr_Occurred()) {
          Py_DECREF(new);
          if (string)
              PyBuffer_Release(&buf);
          return NULL;
      }
      if (string) {
          sha_update(new, buf.buf, buf.len);
          PyBuffer_Release(&buf);
      }
  
      return (PyObject *)new;
  }
  
  /*[clinic input]
  _sha256.sha224
  
      string: object(c_default="NULL") = b''
  
  Return a new SHA-224 hash object; optionally initialized with a string.
  [clinic start generated code]*/
  
  static PyObject *
  _sha256_sha224_impl(PyObject *module, PyObject *string)
  /*[clinic end generated code: output=21e3ba22c3404f93 input=27a04ba24c353a73]*/
  {
      SHAobject *new;
      Py_buffer buf;
  
      if (string)
          GET_BUFFER_VIEW_OR_ERROUT(string, &buf);
  
      if ((new = newSHA224object()) == NULL) {
          if (string)
              PyBuffer_Release(&buf);
          return NULL;
      }
  
      sha224_init(new);
  
      if (PyErr_Occurred()) {
          Py_DECREF(new);
          if (string)
              PyBuffer_Release(&buf);
          return NULL;
      }
      if (string) {
          sha_update(new, buf.buf, buf.len);
          PyBuffer_Release(&buf);
      }
  
      return (PyObject *)new;
  }
  
  
  /* List of functions exported by this module */
  
  static struct PyMethodDef SHA_functions[] = {
      _SHA256_SHA256_METHODDEF
      _SHA256_SHA224_METHODDEF
      {NULL,      NULL}            /* Sentinel */
  };
  
  
  /* Initialize this module. */
  
  #define insint(n,v) { PyModule_AddIntConstant(m,n,v); }
  
  
  static struct PyModuleDef _sha256module = {
          PyModuleDef_HEAD_INIT,
          "_sha256",
          NULL,
          -1,
          SHA_functions,
          NULL,
          NULL,
          NULL,
          NULL
  };
  
  PyMODINIT_FUNC
  PyInit__sha256(void)
  {
      PyObject *m;
  
      Py_TYPE(&SHA224type) = &PyType_Type;
      if (PyType_Ready(&SHA224type) < 0)
          return NULL;
      Py_TYPE(&SHA256type) = &PyType_Type;
      if (PyType_Ready(&SHA256type) < 0)
          return NULL;
  
      m = PyModule_Create(&_sha256module);
      if (m == NULL)
          return NULL;
  
      Py_INCREF((PyObject *)&SHA224type);
      PyModule_AddObject(m, "SHA224Type", (PyObject *)&SHA224type);
      Py_INCREF((PyObject *)&SHA256type);
      PyModule_AddObject(m, "SHA256Type", (PyObject *)&SHA256type);
      return m;
  
  }
  