gl/gl_openssl.h

   1 /* Wrap openssl crypto hash routines in gnulib interface.  -*- coding: utf-8 -*-
   2
   3    Copyright (C) 2013-2023 Free Software Foundation, Inc.
   4
   5    This file is free software: you can redistribute it and/or modify
   6    it under the terms of the GNU Lesser General Public License as
   7    published by the Free Software Foundation; either version 2.1 of the
   8    License, or (at your option) any later version.
   9
  10    This file is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13    GNU Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public License
  16    along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
  17
  18 /* Written by Pádraig Brady */
  19
  20 #ifndef GL_OPENSSL_NAME
  21 # error "Please define GL_OPENSSL_NAME to 1,5,256 etc."
  22 #endif
  23
  24 #ifndef _GL_INLINE_HEADER_BEGIN
  25 # error "Please include config.h first."
  26 #endif
  27 _GL_INLINE_HEADER_BEGIN
  28 #ifndef GL_OPENSSL_INLINE
  29 # define GL_OPENSSL_INLINE _GL_INLINE
  30 #endif
  31
  32 /* Concatenate two preprocessor tokens.  */
  33 #define _GLCRYPTO_CONCAT_(prefix, suffix) prefix##suffix
  34 #define _GLCRYPTO_CONCAT(prefix, suffix) _GLCRYPTO_CONCAT_ (prefix, suffix)
  35
  36 #if GL_OPENSSL_NAME == 5
  37 # define OPENSSL_ALG md5
  38 #else
  39 # define OPENSSL_ALG _GLCRYPTO_CONCAT (sha, GL_OPENSSL_NAME)
  40 #endif
  41
  42 /* Context type mappings.  */
  43 #if BASE_OPENSSL_TYPE != GL_OPENSSL_NAME
  44 # undef BASE_OPENSSL_TYPE
  45 # if GL_OPENSSL_NAME == 224
  46 #  define BASE_OPENSSL_TYPE 256
  47 # elif GL_OPENSSL_NAME == 384
  48 #  define BASE_OPENSSL_TYPE 512
  49 # endif
  50 # define md5_CTX MD5_CTX
  51 # define sha1_CTX SHA_CTX
  52 # define sha224_CTX SHA256_CTX
  53 # define sha224_ctx sha256_ctx
  54 # define sha256_CTX SHA256_CTX
  55 # define sha384_CTX SHA512_CTX
  56 # define sha384_ctx sha512_ctx
  57 # define sha512_CTX SHA512_CTX
  58 # undef _gl_CTX
  59 # undef _gl_ctx
  60 # define _gl_CTX _GLCRYPTO_CONCAT (OPENSSL_ALG, _CTX) /* openssl type.  */
  61 # define _gl_ctx _GLCRYPTO_CONCAT (OPENSSL_ALG, _ctx) /* gnulib type.  */
  62
  63 struct _gl_ctx { _gl_CTX CTX; };
  64 #endif
  65
  66 /* Function name mappings.  */
  67 #define md5_prefix MD5
  68 #define sha1_prefix SHA1
  69 #define sha224_prefix SHA224
  70 #define sha256_prefix SHA256
  71 #define sha384_prefix SHA384
  72 #define sha512_prefix SHA512
  73 #define _GLCRYPTO_PREFIX _GLCRYPTO_CONCAT (OPENSSL_ALG, _prefix)
  74 #define OPENSSL_FN(suffix) _GLCRYPTO_CONCAT (_GLCRYPTO_PREFIX, suffix)
  75 #define GL_CRYPTO_FN(suffix) _GLCRYPTO_CONCAT (OPENSSL_ALG, suffix)
  76
  77 GL_OPENSSL_INLINE void
  78 GL_CRYPTO_FN (_init_ctx) (struct _gl_ctx *ctx)
  79 { (void) OPENSSL_FN (_Init) ((_gl_CTX *) ctx); }
  80
  81 /* These were never exposed by gnulib.  */
  82 #if ! (GL_OPENSSL_NAME == 224 || GL_OPENSSL_NAME == 384)
  83 GL_OPENSSL_INLINE void
  84 GL_CRYPTO_FN (_process_bytes) (const void *buf, size_t len, struct _gl_ctx *ctx)
  85 { OPENSSL_FN (_Update) ((_gl_CTX *) ctx, buf, len); }
  86
  87 GL_OPENSSL_INLINE void
  88 GL_CRYPTO_FN (_process_block) (const void *buf, size_t len, struct _gl_ctx *ctx)
  89 { GL_CRYPTO_FN (_process_bytes) (buf, len, ctx); }
  90 #endif
  91
  92 GL_OPENSSL_INLINE void *
  93 GL_CRYPTO_FN (_finish_ctx) (struct _gl_ctx *ctx, void *restrict res)
  94 { OPENSSL_FN (_Final) ((unsigned char *) res, (_gl_CTX *) ctx); return res; }
  95
  96 GL_OPENSSL_INLINE void *
  97 GL_CRYPTO_FN (_buffer) (const char *buf, size_t len, void *restrict res)
  98 { return OPENSSL_FN () ((const unsigned char *) buf, len, (unsigned char *) res); }
  99
 100 GL_OPENSSL_INLINE void *
 101 GL_CRYPTO_FN (_read_ctx) (const struct _gl_ctx *ctx, void *restrict res)
 102 {
 103   /* Assume any unprocessed bytes in ctx are not to be ignored.  */
 104   _gl_CTX tmp_ctx = *(_gl_CTX *) ctx;
 105   OPENSSL_FN (_Final) ((unsigned char *) res, &tmp_ctx);
 106   return res;
 107 }
 108
 109 /* Undef so we can include multiple times.  */
 110 #undef GL_CRYPTO_FN
 111 #undef OPENSSL_FN
 112 #undef _GLCRYPTO_PREFIX
 113 #undef OPENSSL_ALG
 114 #undef GL_OPENSSL_NAME
 115
 116 _GL_INLINE_HEADER_END