1: /* Declaration of functions and data types used for SHA256 sum computing
    2:    library functions.
    3:    Copyright (C) 2007 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, write to the Free
   18:    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
   19:    02111-1307 USA.  */
   20: 
   21: #ifndef _SHA256_H
   22: #define _SHA256_H 1
   23: 
   24: #include <limits.h>
   25: #include <stdint.h>
   26: #include <stdio.h>
   27: 
   28: 
   29: /* Structure to save state of computation between the single steps.  */
   30: struct sha256_ctx
   31: {
   32:   uint32_t H[8];
   33: 
   34:   uint32_t total[2];
   35:   uint32_t buflen;
   36:   char buffer[128] __attribute__ ((__aligned__ (__alignof__ (uint32_t))));
   37: };
   38: 
   39: /* Initialize structure containing state of computation.
   40:    (FIPS 180-2: 5.3.2)  */
   41: extern void __sha256_init_ctx (struct sha256_ctx *ctx) __THROW;
   42: 
   43: /* Starting with the result of former calls of this function (or the
   44:    initialization function update the context for the next LEN bytes
   45:    starting at BUFFER.
   46:    It is NOT required that LEN is a multiple of 64.  */
   47: extern void __sha256_process_bytes (const void *buffer, size_t len,
   48:                                     struct sha256_ctx *ctx) __THROW;
   49: 
   50: /* Process the remaining bytes in the buffer and put result from CTX
   51:    in first 32 bytes following RESBUF.
   52: 
   53:    IMPORTANT: On some systems it is required that RESBUF is correctly
   54:    aligned for a 32 bits value.  */
   55: extern void *__sha256_finish_ctx (struct sha256_ctx *ctx, void *resbuf)
   56:   __THROW;
   57: 
   58: #endif /* sha256.h */