1  /* Declaration of functions and data types used for SHA512 sum computing
       2     library functions.
       3     Copyright (C) 2007-2023 Free Software Foundation, Inc.
       4     This file is part of the GNU C Library.
       5  
       6     The GNU C Library is free software; you can redistribute it and/or
       7     modify it under the terms of the GNU Lesser General Public
       8     License as published by the Free Software Foundation; either
       9     version 2.1 of the License, or (at your option) any later version.
      10  
      11     The GNU C Library is distributed in the hope that it will be useful,
      12     but WITHOUT ANY WARRANTY; without even the implied warranty of
      13     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      14     Lesser General Public License for more details.
      15  
      16     You should have received a copy of the GNU Lesser General Public
      17     License along with the GNU C Library; if not, see
      18     <https://www.gnu.org/licenses/>.  */
      19  
      20  #ifndef _SHA512_H
      21  #define _SHA512_H 1
      22  
      23  #include <limits.h>
      24  #include <stdint.h>
      25  #include <stdio.h>
      26  #include <endian.h>
      27  #include <bits/wordsize.h>
      28  
      29  
      30  /* Structure to save state of computation between the single steps.  */
      31  struct sha512_ctx
      32  {
      33    uint64_t H[8];
      34  
      35    union
      36    {
      37  #if defined __GNUC__ && __WORDSIZE == 64
      38  # define USE_TOTAL128
      39      unsigned int total128 __attribute__ ((__mode__ (TI)));
      40  #endif
      41  #define TOTAL128_low (1 - (BYTE_ORDER == LITTLE_ENDIAN))
      42  #define TOTAL128_high (BYTE_ORDER == LITTLE_ENDIAN)
      43      uint64_t total[2];
      44    };
      45    uint64_t buflen;
      46    union
      47    {
      48      char buffer[256];
      49      uint64_t buffer64[32];
      50    };
      51  };
      52  
      53  /* Initialize structure containing state of computation.
      54     (FIPS 180-2: 5.3.3)  */
      55  extern void __sha512_init_ctx (struct sha512_ctx *ctx) __THROW;
      56  
      57  /* Starting with the result of former calls of this function (or the
      58     initialization function update the context for the next LEN bytes
      59     starting at BUFFER.
      60     It is NOT required that LEN is a multiple of 128.  */
      61  extern void __sha512_process_bytes (const void *buffer, size_t len,
      62  				    struct sha512_ctx *ctx) __THROW;
      63  
      64  /* Process the remaining bytes in the buffer and put result from CTX
      65     in first 64 bytes following RESBUF.
      66  
      67     IMPORTANT: On some systems it is required that RESBUF is correctly
      68     aligned for a 64 bits value.  */
      69  extern void *__sha512_finish_ctx (struct sha512_ctx *ctx, void *resbuf)
      70    __THROW;
      71  
      72  #endif /* sha512.h */