text: /* sha256.c - SHA256 hash function
   * Copyright (C) 2003, 2006, 2008, 2009 Free Software Foundation, Inc.
   *
   * This file is part of Libgcrypt.
   *
   * Libgcrypt is free software; you can redistribute it and/or modify
   * it under the terms of the GNU Lesser General Public License as
   * published by the Free Software Foundation; either version 2.1 of
   * the License, or (at your option) any later version.
   *
   * Libgcrypt is distributed in the hope that it will be useful,
   * but WITHOUT ANY WARRANTY; without even the implied warranty of
   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   * GNU Lesser General Public License for more details.
   *
   * You should have received a copy of the GNU Lesser General Public
   * License along with this program; if not, see <http://www.gnu.org/licenses/>.
   */
  
  
  /*  Test vectors:
  
      "abc"
      SHA224: 23097d22 3405d822 8642a477 bda255b3 2aadbce4 bda0b3f7 e36c9da7
      SHA256: ba7816bf 8f01cfea 414140de 5dae2223 b00361a3 96177a9c b410ff61 f20015ad
  
      "abcdbcdecdefdefgefghfghighijhijkijkljklmklmnlmnomnopnopq"
      SHA224: 75388b16 512776cc 5dba5da1 fd890150 b0c6455c b4f58b19 52522525
      SHA256: 248d6a61 d20638b8 e5c02693 0c3e6039 a33ce459 64ff2167 f6ecedd4 19db06c1
  
      "a" one million times
      SHA224: 20794655 980c91d8 bbb4c1ea 97618a4b f03f4258 1948b2ee 4ee7ad67
      SHA256: cdc76e5c 9914fb92 81a1c7e2 84d73e67 f1809a48 a497200e 046d39cc c7112cd0
  
   */
  
  
  #include <config.h>
  #include <stdio.h>
  #include <stdlib.h>
  #include <string.h>
  
  #include "g10lib.h"
  #include "bithelp.h"
  #include "bufhelp.h"
  #include "cipher.h"
  #include "hash-common.h"
  
  
  /* USE_SSSE3 indicates whether to compile with Intel SSSE3 code. */
  #undef USE_SSSE3
  #if defined(__x86_64__) && defined(HAVE_GCC_INLINE_ASM_SSSE3) && \
      defined(HAVE_INTEL_SYNTAX_PLATFORM_AS) && \
      (defined(HAVE_COMPATIBLE_GCC_AMD64_PLATFORM_AS) || \
       defined(HAVE_COMPATIBLE_GCC_WIN64_PLATFORM_AS))
  # define USE_SSSE3 1
  #endif
  
  /* USE_AVX indicates whether to compile with Intel AVX code. */
  #undef USE_AVX
  #if defined(__x86_64__) && defined(HAVE_GCC_INLINE_ASM_AVX) && \
      defined(HAVE_INTEL_SYNTAX_PLATFORM_AS) && \
      (defined(HAVE_COMPATIBLE_GCC_AMD64_PLATFORM_AS) || \
       defined(HAVE_COMPATIBLE_GCC_WIN64_PLATFORM_AS))
  # define USE_AVX 1
  #endif
  
  /* USE_AVX2 indicates whether to compile with Intel AVX2/BMI2 code. */
  #undef USE_AVX2
  #if defined(__x86_64__) && defined(HAVE_GCC_INLINE_ASM_AVX2) && \
      defined(HAVE_GCC_INLINE_ASM_BMI2) && \
      defined(HAVE_INTEL_SYNTAX_PLATFORM_AS) && \
      (defined(HAVE_COMPATIBLE_GCC_AMD64_PLATFORM_AS) || \
       defined(HAVE_COMPATIBLE_GCC_WIN64_PLATFORM_AS))
  # define USE_AVX2 1
  #endif
  
  /* USE_ARM_CE indicates whether to enable ARMv8 Crypto Extension assembly
   * code. */
  #undef USE_ARM_CE
  #ifdef ENABLE_ARM_CRYPTO_SUPPORT
  # if defined(HAVE_ARM_ARCH_V6) && defined(__ARMEL__) \
       && defined(HAVE_COMPATIBLE_GCC_ARM_PLATFORM_AS) \
       && defined(HAVE_GCC_INLINE_ASM_AARCH32_CRYPTO)
  #  define USE_ARM_CE 1
  # elif defined(__AARCH64EL__) \
         && defined(HAVE_COMPATIBLE_GCC_AARCH64_PLATFORM_AS) \
         && defined(HAVE_GCC_INLINE_ASM_AARCH64_CRYPTO)
  #  define USE_ARM_CE 1
  # endif
  #endif
  
  
  typedef struct {
    gcry_md_block_ctx_t bctx;
    u32  h0,h1,h2,h3,h4,h5,h6,h7;
  #ifdef USE_SSSE3
    unsigned int use_ssse3:1;
  #endif
  #ifdef USE_AVX
    unsigned int use_avx:1;
  #endif
  #ifdef USE_AVX2
    unsigned int use_avx2:1;
  #endif
  #ifdef USE_ARM_CE
    unsigned int use_arm_ce:1;
  #endif
  } SHA256_CONTEXT;
  
  
  static unsigned int
  transform (void *c, const unsigned char *data, size_t nblks);
  
  
  static void
  sha256_init (void *context, unsigned int flags)
  {
    SHA256_CONTEXT *hd = context;
    unsigned int features = _gcry_get_hw_features ();
  
    (void)flags;
  
    hd->h0 = 0x6a09e667;
    hd->h1 = 0xbb67ae85;
    hd->h2 = 0x3c6ef372;
    hd->h3 = 0xa54ff53a;
    hd->h4 = 0x510e527f;
    hd->h5 = 0x9b05688c;
    hd->h6 = 0x1f83d9ab;
    hd->h7 = 0x5be0cd19;
  
    hd->bctx.nblocks = 0;
    hd->bctx.nblocks_high = 0;
    hd->bctx.count = 0;
    hd->bctx.blocksize = 64;
    hd->bctx.bwrite = transform;
  
  #ifdef USE_SSSE3
    hd->use_ssse3 = (features & HWF_INTEL_SSSE3) != 0;
  #endif
  #ifdef USE_AVX
    /* AVX implementation uses SHLD which is known to be slow on non-Intel CPUs.
     * Therefore use this implementation on Intel CPUs only. */
    hd->use_avx = (features & HWF_INTEL_AVX) && (features & HWF_INTEL_FAST_SHLD);
  #endif
  #ifdef USE_AVX2
    hd->use_avx2 = (features & HWF_INTEL_AVX2) && (features & HWF_INTEL_BMI2);
  #endif
  #ifdef USE_ARM_CE
    hd->use_arm_ce = (features & HWF_ARM_SHA2) != 0;
  #endif
    (void)features;
  }
  
  
  static void
  sha224_init (void *context, unsigned int flags)
  {
    SHA256_CONTEXT *hd = context;
    unsigned int features = _gcry_get_hw_features ();
  
    (void)flags;
  
    hd->h0 = 0xc1059ed8;
    hd->h1 = 0x367cd507;
    hd->h2 = 0x3070dd17;
    hd->h3 = 0xf70e5939;
    hd->h4 = 0xffc00b31;
    hd->h5 = 0x68581511;
    hd->h6 = 0x64f98fa7;
    hd->h7 = 0xbefa4fa4;
  
    hd->bctx.nblocks = 0;
    hd->bctx.nblocks_high = 0;
    hd->bctx.count = 0;
    hd->bctx.blocksize = 64;
    hd->bctx.bwrite = transform;
  
  #ifdef USE_SSSE3
    hd->use_ssse3 = (features & HWF_INTEL_SSSE3) != 0;
  #endif
  #ifdef USE_AVX
    /* AVX implementation uses SHLD which is known to be slow on non-Intel CPUs.
     * Therefore use this implementation on Intel CPUs only. */
    hd->use_avx = (features & HWF_INTEL_AVX) && (features & HWF_INTEL_FAST_SHLD);
  #endif
  #ifdef USE_AVX2
    hd->use_avx2 = (features & HWF_INTEL_AVX2) && (features & HWF_INTEL_BMI2);
  #endif
  #ifdef USE_ARM_CE
    hd->use_arm_ce = (features & HWF_ARM_SHA2) != 0;
  #endif
    (void)features;
  }
  
  
  /*
    Transform the message X which consists of 16 32-bit-words. See FIPS
    180-2 for details.  */
  #define R(a,b,c,d,e,f,g,h,k,w) do                                 \
            {                                                       \
              t1 = (h) + Sum1((e)) + Cho((e),(f),(g)) + (k) + (w);  \
              t2 = Sum0((a)) + Maj((a),(b),(c));                    \
              d += t1;                                              \
              h  = t1 + t2;                                         \
            } while (0)
  
  /* (4.2) same as SHA-1's F1.  */
  #define Cho(x, y, z)  (z ^ (x & (y ^ z)))
  
  /* (4.3) same as SHA-1's F3 */
  #define Maj(x, y, z)  ((x & y) + (z & (x ^ y)))
  
  /* (4.4) */
  #define Sum0(x)       (ror (x, 2) ^ ror (x, 13) ^ ror (x, 22))
  
  /* (4.5) */
  #define Sum1(x)       (ror (x, 6) ^ ror (x, 11) ^ ror (x, 25))
  
  /* Message expansion */
  #define S0(x) (ror ((x), 7) ^ ror ((x), 18) ^ ((x) >> 3))       /* (4.6) */
  #define S1(x) (ror ((x), 17) ^ ror ((x), 19) ^ ((x) >> 10))     /* (4.7) */
  #define I(i) ( w[i] = buf_get_be32(data + i * 4) )
  #define W(i) ( w[i&0x0f] =    S1(w[(i-2) &0x0f]) \
                              +    w[(i-7) &0x0f]  \
                              + S0(w[(i-15)&0x0f]) \
                              +    w[(i-16)&0x0f] )
  
  static unsigned int
  transform_blk (void *ctx, const unsigned char *data)
  {
    SHA256_CONTEXT *hd = ctx;
    static const u32 K[64] = {
      0x428a2f98, 0x71374491, 0xb5c0fbcf, 0xe9b5dba5,
      0x3956c25b, 0x59f111f1, 0x923f82a4, 0xab1c5ed5,
      0xd807aa98, 0x12835b01, 0x243185be, 0x550c7dc3,
      0x72be5d74, 0x80deb1fe, 0x9bdc06a7, 0xc19bf174,
      0xe49b69c1, 0xefbe4786, 0x0fc19dc6, 0x240ca1cc,
      0x2de92c6f, 0x4a7484aa, 0x5cb0a9dc, 0x76f988da,
      0x983e5152, 0xa831c66d, 0xb00327c8, 0xbf597fc7,
      0xc6e00bf3, 0xd5a79147, 0x06ca6351, 0x14292967,
      0x27b70a85, 0x2e1b2138, 0x4d2c6dfc, 0x53380d13,
      0x650a7354, 0x766a0abb, 0x81c2c92e, 0x92722c85,
      0xa2bfe8a1, 0xa81a664b, 0xc24b8b70, 0xc76c51a3,
      0xd192e819, 0xd6990624, 0xf40e3585, 0x106aa070,
      0x19a4c116, 0x1e376c08, 0x2748774c, 0x34b0bcb5,
      0x391c0cb3, 0x4ed8aa4a, 0x5b9cca4f, 0x682e6ff3,
      0x748f82ee, 0x78a5636f, 0x84c87814, 0x8cc70208,
      0x90befffa, 0xa4506ceb, 0xbef9a3f7, 0xc67178f2
    };
  
    u32 a,b,c,d,e,f,g,h,t1,t2;
    u32 w[16];
  
    a = hd->h0;
    b = hd->h1;
    c = hd->h2;
    d = hd->h3;
    e = hd->h4;
    f = hd->h5;
    g = hd->h6;
    h = hd->h7;
  
    R(a, b, c, d, e, f, g, h, K[0], I(0));
    R(h, a, b, c, d, e, f, g, K[1], I(1));
    R(g, h, a, b, c, d, e, f, K[2], I(2));
    R(f, g, h, a, b, c, d, e, K[3], I(3));
    R(e, f, g, h, a, b, c, d, K[4], I(4));
    R(d, e, f, g, h, a, b, c, K[5], I(5));
    R(c, d, e, f, g, h, a, b, K[6], I(6));
    R(b, c, d, e, f, g, h, a, K[7], I(7));
    R(a, b, c, d, e, f, g, h, K[8], I(8));
    R(h, a, b, c, d, e, f, g, K[9], I(9));
    R(g, h, a, b, c, d, e, f, K[10], I(10));
    R(f, g, h, a, b, c, d, e, K[11], I(11));
    R(e, f, g, h, a, b, c, d, K[12], I(12));
    R(d, e, f, g, h, a, b, c, K[13], I(13));
    R(c, d, e, f, g, h, a, b, K[14], I(14));
    R(b, c, d, e, f, g, h, a, K[15], I(15));
  
    R(a, b, c, d, e, f, g, h, K[16], W(16));
    R(h, a, b, c, d, e, f, g, K[17], W(17));
    R(g, h, a, b, c, d, e, f, K[18], W(18));
    R(f, g, h, a, b, c, d, e, K[19], W(19));
    R(e, f, g, h, a, b, c, d, K[20], W(20));
    R(d, e, f, g, h, a, b, c, K[21], W(21));
    R(c, d, e, f, g, h, a, b, K[22], W(22));
    R(b, c, d, e, f, g, h, a, K[23], W(23));
    R(a, b, c, d, e, f, g, h, K[24], W(24));
    R(h, a, b, c, d, e, f, g, K[25], W(25));
    R(g, h, a, b, c, d, e, f, K[26], W(26));
    R(f, g, h, a, b, c, d, e, K[27], W(27));
    R(e, f, g, h, a, b, c, d, K[28], W(28));
    R(d, e, f, g, h, a, b, c, K[29], W(29));
    R(c, d, e, f, g, h, a, b, K[30], W(30));
    R(b, c, d, e, f, g, h, a, K[31], W(31));
  
    R(a, b, c, d, e, f, g, h, K[32], W(32));
    R(h, a, b, c, d, e, f, g, K[33], W(33));
    R(g, h, a, b, c, d, e, f, K[34], W(34));
    R(f, g, h, a, b, c, d, e, K[35], W(35));
    R(e, f, g, h, a, b, c, d, K[36], W(36));
    R(d, e, f, g, h, a, b, c, K[37], W(37));
    R(c, d, e, f, g, h, a, b, K[38], W(38));
    R(b, c, d, e, f, g, h, a, K[39], W(39));
    R(a, b, c, d, e, f, g, h, K[40], W(40));
    R(h, a, b, c, d, e, f, g, K[41], W(41));
    R(g, h, a, b, c, d, e, f, K[42], W(42));
    R(f, g, h, a, b, c, d, e, K[43], W(43));
    R(e, f, g, h, a, b, c, d, K[44], W(44));
    R(d, e, f, g, h, a, b, c, K[45], W(45));
    R(c, d, e, f, g, h, a, b, K[46], W(46));
    R(b, c, d, e, f, g, h, a, K[47], W(47));
  
    R(a, b, c, d, e, f, g, h, K[48], W(48));
    R(h, a, b, c, d, e, f, g, K[49], W(49));
    R(g, h, a, b, c, d, e, f, K[50], W(50));
    R(f, g, h, a, b, c, d, e, K[51], W(51));
    R(e, f, g, h, a, b, c, d, K[52], W(52));
    R(d, e, f, g, h, a, b, c, K[53], W(53));
    R(c, d, e, f, g, h, a, b, K[54], W(54));
    R(b, c, d, e, f, g, h, a, K[55], W(55));
    R(a, b, c, d, e, f, g, h, K[56], W(56));
    R(h, a, b, c, d, e, f, g, K[57], W(57));
    R(g, h, a, b, c, d, e, f, K[58], W(58));
    R(f, g, h, a, b, c, d, e, K[59], W(59));
    R(e, f, g, h, a, b, c, d, K[60], W(60));
    R(d, e, f, g, h, a, b, c, K[61], W(61));
    R(c, d, e, f, g, h, a, b, K[62], W(62));
    R(b, c, d, e, f, g, h, a, K[63], W(63));
  
    hd->h0 += a;
    hd->h1 += b;
    hd->h2 += c;
    hd->h3 += d;
    hd->h4 += e;
    hd->h5 += f;
    hd->h6 += g;
    hd->h7 += h;
  
    return /*burn_stack*/ 26*4+32;
  }
  #undef S0
  #undef S1
  #undef R
  
  
  /* Assembly implementations use SystemV ABI, ABI conversion and additional
   * stack to store XMM6-XMM15 needed on Win64. */
  #undef ASM_FUNC_ABI
  #undef ASM_EXTRA_STACK
  #if defined(USE_SSSE3) || defined(USE_AVX) || defined(USE_AVX2)
  # ifdef HAVE_COMPATIBLE_GCC_WIN64_PLATFORM_AS
  #  define ASM_FUNC_ABI __attribute__((sysv_abi))
  #  define ASM_EXTRA_STACK (10 * 16)
  # else
  #  define ASM_FUNC_ABI
  #  define ASM_EXTRA_STACK 0
  # endif
  #endif
  
  
  #ifdef USE_SSSE3
  unsigned int _gcry_sha256_transform_amd64_ssse3(const void *input_data,
                                                  u32 state[8],
                                                  size_t num_blks) ASM_FUNC_ABI;
  #endif
  
  #ifdef USE_AVX
  unsigned int _gcry_sha256_transform_amd64_avx(const void *input_data,
                                                u32 state[8],
                                                size_t num_blks) ASM_FUNC_ABI;
  #endif
  
  #ifdef USE_AVX2
  unsigned int _gcry_sha256_transform_amd64_avx2(const void *input_data,
                                                 u32 state[8],
                                                 size_t num_blks) ASM_FUNC_ABI;
  #endif
  
  #ifdef USE_ARM_CE
  unsigned int _gcry_sha256_transform_armv8_ce(u32 state[8],
                                               const void *input_data,
                                               size_t num_blks);
  #endif
  
  static unsigned int
  transform (void *ctx, const unsigned char *data, size_t nblks)
  {
    SHA256_CONTEXT *hd = ctx;
    unsigned int burn;
  
  #ifdef USE_AVX2
    if (hd->use_avx2)
      return _gcry_sha256_transform_amd64_avx2 (data, &hd->h0, nblks)
             + 4 * sizeof(void*) + ASM_EXTRA_STACK;
  #endif
  
  #ifdef USE_AVX
    if (hd->use_avx)
      return _gcry_sha256_transform_amd64_avx (data, &hd->h0, nblks)
             + 4 * sizeof(void*) + ASM_EXTRA_STACK;
  #endif
  
  #ifdef USE_SSSE3
    if (hd->use_ssse3)
      return _gcry_sha256_transform_amd64_ssse3 (data, &hd->h0, nblks)
             + 4 * sizeof(void*) + ASM_EXTRA_STACK;
  #endif
  
  #ifdef USE_ARM_CE
    if (hd->use_arm_ce)
      return _gcry_sha256_transform_armv8_ce (&hd->h0, data, nblks);
  #endif
  
    do
      {
        burn = transform_blk (hd, data);
        data += 64;
      }
    while (--nblks);
  
  #ifdef ASM_EXTRA_STACK
    /* 'transform_blk' is typically inlined and XMM6-XMM15 are stored at
     *  the prologue of this function. Therefore need to add ASM_EXTRA_STACK to
     *  here too.
     */
    burn += ASM_EXTRA_STACK;
  #endif
  
    return burn;
  }
  
  
  /*
     The routine finally terminates the computation and returns the
     digest.  The handle is prepared for a new cycle, but adding bytes
     to the handle will the destroy the returned buffer.  Returns: 32
     bytes with the message the digest.  */
  static void
  sha256_final(void *context)
  {
    SHA256_CONTEXT *hd = context;
    u32 t, th, msb, lsb;
    byte *p;
    unsigned int burn;
  
    _gcry_md_block_write (hd, NULL, 0); /* flush */;
  
    t = hd->bctx.nblocks;
    if (sizeof t == sizeof hd->bctx.nblocks)
      th = hd->bctx.nblocks_high;
    else
      th = hd->bctx.nblocks >> 32;
  
    /* multiply by 64 to make a byte count */
    lsb = t << 6;
    msb = (th << 6) | (t >> 26);
    /* add the count */
    t = lsb;
    if ((lsb += hd->bctx.count) < t)
      msb++;
    /* multiply by 8 to make a bit count */
    t = lsb;
    lsb <<= 3;
    msb <<= 3;
    msb |= t >> 29;
  
    if (hd->bctx.count < 56)
      { /* enough room */
        hd->bctx.buf[hd->bctx.count++] = 0x80; /* pad */
        while (hd->bctx.count < 56)
          hd->bctx.buf[hd->bctx.count++] = 0;  /* pad */
      }
    else
      { /* need one extra block */
        hd->bctx.buf[hd->bctx.count++] = 0x80; /* pad character */
        while (hd->bctx.count < 64)
          hd->bctx.buf[hd->bctx.count++] = 0;
        _gcry_md_block_write (hd, NULL, 0);  /* flush */;
        memset (hd->bctx.buf, 0, 56 ); /* fill next block with zeroes */
      }
    /* append the 64 bit count */
    buf_put_be32(hd->bctx.buf + 56, msb);
    buf_put_be32(hd->bctx.buf + 60, lsb);
    burn = transform (hd, hd->bctx.buf, 1);
    _gcry_burn_stack (burn);
  
    p = hd->bctx.buf;
  #define X(a) do { buf_put_be32(p, hd->h##a); p += 4; } while(0)
    X(0);
    X(1);
    X(2);
    X(3);
    X(4);
    X(5);
    X(6);
    X(7);
  #undef X
  }
  
  static byte *
  sha256_read (void *context)
  {
    SHA256_CONTEXT *hd = context;
  
    return hd->bctx.buf;
  }
  
  
  /* Shortcut functions which puts the hash value of the supplied buffer
   * into outbuf which must have a size of 32 bytes.  */
  void
  _gcry_sha256_hash_buffer (void *outbuf, const void *buffer, size_t length)
  {
    SHA256_CONTEXT hd;
  
    sha256_init (&hd, 0);
    _gcry_md_block_write (&hd, buffer, length);
    sha256_final (&hd);
    memcpy (outbuf, hd.bctx.buf, 32);
  }
  
  
  /* Variant of the above shortcut function using multiple buffers.  */
  void
  _gcry_sha256_hash_buffers (void *outbuf, const gcry_buffer_t *iov, int iovcnt)
  {
    SHA256_CONTEXT hd;
  
    sha256_init (&hd, 0);
    for (;iovcnt > 0; iov++, iovcnt--)
      _gcry_md_block_write (&hd,
                            (const char*)iov[0].data + iov[0].off, iov[0].len);
    sha256_final (&hd);
    memcpy (outbuf, hd.bctx.buf, 32);
  }
  
  
  
  /*
       Self-test section.
   */
  
  
  static gpg_err_code_t
  selftests_sha224 (int extended, selftest_report_func_t report)
  {
    const char *what;
    const char *errtxt;
  
    what = "short string";
    errtxt = _gcry_hash_selftest_check_one
      (GCRY_MD_SHA224, 0,
       "abc", 3,
       "\x23\x09\x7d\x22\x34\x05\xd8\x22\x86\x42\xa4\x77\xbd\xa2\x55\xb3"
       "\x2a\xad\xbc\xe4\xbd\xa0\xb3\xf7\xe3\x6c\x9d\xa7", 28);
    if (errtxt)
      goto failed;
  
    if (extended)
      {
        what = "long string";
        errtxt = _gcry_hash_selftest_check_one
          (GCRY_MD_SHA224, 0,
           "abcdbcdecdefdefgefghfghighijhijkijkljklmklmnlmnomnopnopq", 56,
           "\x75\x38\x8b\x16\x51\x27\x76\xcc\x5d\xba\x5d\xa1\xfd\x89\x01\x50"
           "\xb0\xc6\x45\x5c\xb4\xf5\x8b\x19\x52\x52\x25\x25", 28);
        if (errtxt)
          goto failed;
  
        what = "one million \"a\"";
        errtxt = _gcry_hash_selftest_check_one
          (GCRY_MD_SHA224, 1,
           NULL, 0,
           "\x20\x79\x46\x55\x98\x0c\x91\xd8\xbb\xb4\xc1\xea\x97\x61\x8a\x4b"
           "\xf0\x3f\x42\x58\x19\x48\xb2\xee\x4e\xe7\xad\x67", 28);
        if (errtxt)
          goto failed;
      }
  
    return 0; /* Succeeded. */
  
   failed:
    if (report)
      report ("digest", GCRY_MD_SHA224, what, errtxt);
    return GPG_ERR_SELFTEST_FAILED;
  }
  
  static gpg_err_code_t
  selftests_sha256 (int extended, selftest_report_func_t report)
  {
    const char *what;
    const char *errtxt;
  
    what = "short string";
    errtxt = _gcry_hash_selftest_check_one
      (GCRY_MD_SHA256, 0,
       "abc", 3,
       "\xba\x78\x16\xbf\x8f\x01\xcf\xea\x41\x41\x40\xde\x5d\xae\x22\x23"
       "\xb0\x03\x61\xa3\x96\x17\x7a\x9c\xb4\x10\xff\x61\xf2\x00\x15\xad", 32);
    if (errtxt)
      goto failed;
  
    if (extended)
      {
        what = "long string";
        errtxt = _gcry_hash_selftest_check_one
          (GCRY_MD_SHA256, 0,
           "abcdbcdecdefdefgefghfghighijhijkijkljklmklmnlmnomnopnopq", 56,
           "\x24\x8d\x6a\x61\xd2\x06\x38\xb8\xe5\xc0\x26\x93\x0c\x3e\x60\x39"
           "\xa3\x3c\xe4\x59\x64\xff\x21\x67\xf6\xec\xed\xd4\x19\xdb\x06\xc1",
           32);
        if (errtxt)
          goto failed;
  
        what = "one million \"a\"";
        errtxt = _gcry_hash_selftest_check_one
          (GCRY_MD_SHA256, 1,
           NULL, 0,
           "\xcd\xc7\x6e\x5c\x99\x14\xfb\x92\x81\xa1\xc7\xe2\x84\xd7\x3e\x67"
           "\xf1\x80\x9a\x48\xa4\x97\x20\x0e\x04\x6d\x39\xcc\xc7\x11\x2c\xd0",
           32);
        if (errtxt)
          goto failed;
      }
  
    return 0; /* Succeeded. */
  
   failed:
    if (report)
      report ("digest", GCRY_MD_SHA256, what, errtxt);
    return GPG_ERR_SELFTEST_FAILED;
  }
  
  
  /* Run a full self-test for ALGO and return 0 on success.  */
  static gpg_err_code_t
  run_selftests (int algo, int extended, selftest_report_func_t report)
  {
    gpg_err_code_t ec;
  
    switch (algo)
      {
      case GCRY_MD_SHA224:
        ec = selftests_sha224 (extended, report);
        break;
      case GCRY_MD_SHA256:
        ec = selftests_sha256 (extended, report);
        break;
      default:
        ec = GPG_ERR_DIGEST_ALGO;
        break;
  
      }
    return ec;
  }
  
  
  
  
  static byte asn224[19] = /* Object ID is 2.16.840.1.101.3.4.2.4 */
    { 0x30, 0x2D, 0x30, 0x0d, 0x06, 0x09, 0x60, 0x86, 0x48,
      0x01, 0x65, 0x03, 0x04, 0x02, 0x04, 0x05, 0x00, 0x04,
      0x1C
    };
  
  static gcry_md_oid_spec_t oid_spec_sha224[] =
    {
      /* From RFC3874, Section 4 */
      { "2.16.840.1.101.3.4.2.4" },
      { NULL },
    };
  
  static byte asn256[19] = /* Object ID is  2.16.840.1.101.3.4.2.1 */
    { 0x30, 0x31, 0x30, 0x0d, 0x06, 0x09, 0x60, 0x86,
      0x48, 0x01, 0x65, 0x03, 0x04, 0x02, 0x01, 0x05,
      0x00, 0x04, 0x20 };
  
  static gcry_md_oid_spec_t oid_spec_sha256[] =
    {
      /* According to the OpenPGP draft rfc2440-bis06 */
      { "2.16.840.1.101.3.4.2.1" },
      /* PKCS#1 sha256WithRSAEncryption */
      { "1.2.840.113549.1.1.11" },
  
      { NULL },
    };
  
  gcry_md_spec_t _gcry_digest_spec_sha224 =
    {
      GCRY_MD_SHA224, {0, 1},
      "SHA224", asn224, DIM (asn224), oid_spec_sha224, 28,
      sha224_init, _gcry_md_block_write, sha256_final, sha256_read, NULL,
      sizeof (SHA256_CONTEXT),
      run_selftests
    };
  
  gcry_md_spec_t _gcry_digest_spec_sha256 =
    {
      GCRY_MD_SHA256, {0, 1},
      "SHA256", asn256, DIM (asn256), oid_spec_sha256, 32,
      sha256_init, _gcry_md_block_write, sha256_final, sha256_read, NULL,
      sizeof (SHA256_CONTEXT),
      run_selftests
    };
  