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Diffstat (limited to 'doc/gcryptref-digest.sgml')
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diff --git a/doc/gcryptref-digest.sgml b/doc/gcryptref-digest.sgml new file mode 100644 index 000000000..63a345a73 --- /dev/null +++ b/doc/gcryptref-digest.sgml @@ -0,0 +1,191 @@ +<!-- gcryptref-digest.sgml - libgcrypt reference (digests) + Copyright (C) 2000 Free Software Foundation, Inc. + + This file is part of GnuPG. + + GnuPG is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation; either version 2 of the License, or + (at your option) any later version. + + GnuPG 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 General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program; if not, write to the Free Software + Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA +--> + +<refentry> + <refnamediv> + <refname>gcry_md_open</refname> + <refname>gcry_md_enable</refname> + <refname>gcry_md_close</refname> + <refpurpose>create and destroy a message digest context</refpurpose> + </refnamediv> + + <refsynopsisdiv> + <funcsynopsis> + <funcsynopsisinfo> + #include <gcrypt.h> + </funcsynopsisinfo> + <funcprototype> + <funcdef>GCRY_MD_HD <function>gcry_md_open</function></funcdef> + <paramdef>int <parameter>algo</parameter></paramdef> + <paramdef>unsigned int <parameter>flags</parameter></paramdef> + </funcprototype> + <funcprototype> + <funcdef>void <function>gcry_md_enable</function></funcdef> + <paramdef>GCRY_MD_HD <parameter>h</parameter></paramdef> + <paramdef>int <parameter>algo</parameter></paramdef> + </funcprototype> + <funcprototype> + <funcdef>void <function>gcry_md_close</function></funcdef> + <paramdef>GCRY_MD_HD <parameter>h</parameter></paramdef> + </funcprototype> + </funcsynopsis> + </refsynopsisdiv> + + + <refsect1><title>Description</title> + <para> + <indexterm><primary>hash functions</primary> + <secondary>gcry_md_open</secondary> + <secondary>gcry_md_enable</secondary> + <secondary>gcry_md_close</secondary> + </indexterm> + <function>gcry_md_open</function> creates the context required for + the message digest functions. The hash algorithm may optionally be + specified. + <function>gcry_md_close</function> releases all resources associated + with the context. + <function>gcry_md_enable</function> may be used to enable hash + algorithms. This function may be used multiple times to create + a hash context for multiple algorithms. Adding an already enabled algorithm + has no effect. A algorithm must be enabled prios to calculate hash + algorithms. + </para> +</refentry> + +<refentry> + <refnamediv> + <refname>gcry_md_copy</refname> + <refpurpose>create and copy of a message digest context</refpurpose> + </refnamediv> + + <refsynopsisdiv> + <funcsynopsis> + <funcsynopsisinfo> + #include <gcrypt.h> + </funcsynopsisinfo> + <funcprototype> + <funcdef>GCRY_MD_HD <function>gcry_md_copy</function></funcdef> + <paramdef>GCRY_MD_HD <parameter>h</parameter></paramdef> + </funcprototype> + </funcsynopsis> + </refsynopsisdiv> + + + <refsect1><title>Description</title> + <para> + <indexterm><primary>hash functions</primary> + <secondary>gcry_md_copy</secondary> + </indexterm> + <function>gcry_md_copy</function> creates an excat copy of the given context. + This is useful to calculate hashes with a common initial part of the + plaintext. + </para> +</refentry> + +<refentry> + <refnamediv> + <refname>gcry_md_reset</refname> + <refpurpose>reset a message digest context</refpurpose> + </refnamediv> + + <refsynopsisdiv> + <funcsynopsis> + <funcsynopsisinfo> + #include <gcrypt.h> + </funcsynopsisinfo> + <funcprototype> + <funcdef>void <function>gcry_md_reset</function></funcdef> + <paramdef>GCRY_MD_HD <parameter>h</parameter></paramdef> + </funcprototype> + </funcsynopsis> + </refsynopsisdiv> + + + <refsect1><title>Description</title> + <para> + <indexterm><primary>hash functions</primary> + <secondary>gcry_md_reset</secondary> + </indexterm> + <function>gcry_md_reset</function> is used to reuse a message context + without the overhead of an open and close operation. + </para> +</refentry> + + + <refnamediv> + <refname>gcry_md_ctl</refname> + <refpurpose>perform special operations on a digest context</refpurpose> + </refnamediv> + + <refsynopsisdiv> + <funcsynopsis> + <funcsynopsisinfo> + #include <gcrypt.h> + </funcsynopsisinfo> + <funcprototype> + <funcdef>int <function>gcry_md_ctl</function></funcdef> + <paramdef>GCRY_MD_HD <parameter>h</parameter></paramdef> + <paramdef>int <parameter>cmd</parameter></paramdef> + <paramdef>unsigned char * <parameter>buffer</parameter></paramdef> + <paramdef>size_t <parameter>buflen</parameter></paramdef> + </funcprototype> + </funcsynopsis> + </refsynopsisdiv> + + + <refsect1><title>Description</title> + <para> + <indexterm><primary>hash functions</primary> + <secondary>gcry_md_ctl</secondary> + </indexterm> + <function>gcry_md_ctl</function> is a multi-purpose function + to control the behaviour of all gcry_md functions or one instance + of it. + </para> +</refentry> + + +void gcry_md_write( GCRY_MD_HD hd, const byte *buffer, size_t length); +byte *gcry_md_read( GCRY_MD_HD hd, int algo ); +void gcry_md_hash_buffer( int algo, char *digest, + const char *buffer, size_t length); +int gcry_md_get_algo( GCRY_MD_HD hd ); +unsigned int gcry_md_get_algo_dlen( int algo ); +int gcry_md_info( GCRY_MD_HD h, int what, void *buffer, size_t *nbytes); +int gcry_md_algo_info( int algo, int what, void *buffer, size_t *nbytes); +const char *gcry_md_algo_name( int algo ); +int gcry_md_map_name( const char* name ); + +#define gcry_md_putc(h,c) \ + do { \ + if( (h)->bufpos == (h)->bufsize ) \ + gcry_md_write( (h), NULL, 0 ); \ + (h)->buf[(h)->bufpos++] = (c) & 0xff; \ + } while(0) + +#define gcry_md_final(a) \ + gcry_md_ctl( (a), GCRYCTL_FINALIZE, NULL, 0 ) + +#define gcry_md_is_secure(a) \ + gcry_md_info( (a), GCRYCTL_IS_SECURE, NULL, NULL ) + +#define gcry_md_test_algo(a) \ + gcry_md_algo_info( (a), GCRYCTL_TEST_ALGO, NULL, NULL ) + |