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-rw-r--r--cipher/md.c911
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diff --git a/cipher/md.c b/cipher/md.c
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-/* md.c - message digest dispatcher
- * Copyright (C) 1998,1999 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
- */
-
-#include <config.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-#include <errno.h>
-#include <assert.h>
-
-#include "g10lib.h"
-#include "cipher.h"
-#include "dynload.h"
-#include "rmd.h"
-
-
-struct md_digest_list_s;
-
-/* this structure is put right after the GCRY_MD_HD buffer, so that
- * only one memory block is needed. */
-struct gcry_md_context {
- int magic;
- int secure;
- FILE *debug;
- int finalized;
- struct md_digest_list_s *list;
- byte *macpads;
-};
-#define CTX_MAGIC_NORMAL 0x11071961
-#define CTX_MAGIC_SECURE 0x16917011
-
-static const char * digest_algo_to_string( int algo );
-static int check_digest_algo( int algo );
-static GCRY_MD_HD md_open( int algo, int secure, int hmac );
-static int md_enable( GCRY_MD_HD hd, int algo );
-static GCRY_MD_HD md_copy( GCRY_MD_HD a );
-static void md_close(GCRY_MD_HD a);
-static void md_write( GCRY_MD_HD a, byte *inbuf, size_t inlen);
-static void md_final(GCRY_MD_HD a);
-static byte *md_read( GCRY_MD_HD a, int algo );
-static int md_get_algo( GCRY_MD_HD a );
-static int md_digest_length( int algo );
-static const byte *md_asn_oid( int algo, size_t *asnlen, size_t *mdlen );
-static void md_start_debug( GCRY_MD_HD a, const char *suffix );
-static void md_stop_debug( GCRY_MD_HD a );
-
-/****************
- * This structure is used for the list of available algorithms
- * and for the list of algorithms in GCRY_MD_HD.
- */
-struct md_digest_list_s {
- struct md_digest_list_s *next;
- const char *name;
- int algo;
- byte *asnoid;
- int asnlen;
- int mdlen;
- void (*init)( void *c );
- void (*write)( void *c, byte *buf, size_t nbytes );
- void (*final)( void *c );
- byte *(*read)( void *c );
- size_t contextsize; /* allocate this amount of context */
- PROPERLY_ALIGNED_TYPE context;
-};
-
-static struct md_digest_list_s *digest_list;
-
-
-static struct md_digest_list_s *
-new_list_item( int algo,
- const char *(*get_info)( int, size_t*,byte**, int*, int*,
- void (**)(void*),
- void (**)(void*,byte*,size_t),
- void (**)(void*),byte *(**)(void*)) )
-{
- struct md_digest_list_s *r;
-
- r = g10_xcalloc( 1, sizeof *r );
- r->algo = algo,
- r->name = (*get_info)( algo, &r->contextsize,
- &r->asnoid, &r->asnlen, &r->mdlen,
- &r->init, &r->write, &r->final, &r->read );
- if( !r->name ) {
- g10_free(r);
- r = NULL;
- }
- return r;
-}
-
-
-
-/****************
- * Try to load the modules with the requeste algorithm
- * and return true if new modules are available
- * If req_alog is -1 try to load all digest algorithms.
- */
-static int
-load_digest_module( int req_algo )
-{
- static int initialized = 0;
- static u32 checked_algos[256/32];
- static int checked_all = 0;
- struct md_digest_list_s *r;
- void *context = NULL;
- int algo;
- int any = 0;
- const char *(*get_info)( int, size_t*,byte**, int*, int*,
- void (**)(void*),
- void (**)(void*,byte*,size_t),
- void (**)(void*),byte *(**)(void*));
-
- if( !initialized ) {
- cipher_modules_constructor();
- initialized = 1;
- }
- algo = req_algo;
- if( algo > 255 || !algo )
- return 0; /* algorithm number too high (does not fit into out bitmap)*/
- if( checked_all )
- return 0; /* already called with -1 */
- if( algo < 0 )
- checked_all = 1;
- else if( (checked_algos[algo/32] & (1 << (algo%32))) )
- return 0; /* already checked and not found */
- else
- checked_algos[algo/32] |= (1 << (algo%32));
-
- while( enum_gnupgext_digests( &context, &algo, &get_info ) ) {
- if( req_algo != -1 && algo != req_algo )
- continue;
- for(r=digest_list; r; r = r->next )
- if( r->algo == algo )
- break;
- if( r ) {
- log_info("skipping digest %d: already loaded\n", algo );
- continue;
- }
- r = new_list_item( algo, get_info );
- if( ! r ) {
- log_info("skipping digest %d: no name\n", algo );
- continue;
- }
- /* put it into the list */
- if( g10_log_verbosity( 2 ) )
- log_info("loaded digest %d\n", algo);
- r->next = digest_list;
- digest_list = r;
- any = 1;
- if( req_algo != -1 )
- break;
- }
- enum_gnupgext_digests( &context, NULL, NULL );
- return any;
-}
-
-
-
-/****************
- * Map a string to the digest algo
- */
-int
-gcry_md_map_name( const char *string )
-{
- struct md_digest_list_s *r;
-
- do {
- for(r = digest_list; r; r = r->next )
- if( !stricmp( r->name, string ) )
- return r->algo;
- } while( !r && load_digest_module(-1) );
- return 0;
-}
-
-
-/****************
- * Map a digest algo to a string
- */
-static const char *
-digest_algo_to_string( int algo )
-{
- struct md_digest_list_s *r;
-
- do {
- for(r = digest_list; r; r = r->next )
- if( r->algo == algo )
- return r->name;
- } while( !r && load_digest_module( algo ) );
- return NULL;
-}
-
-/****************
- * This function simply returns the name of the algorithm or some constant
- * string when there is no algo. It will never return NULL.
- * Use the macro gcry_md_test_algo() to check whether the algorithm
- * is valid.
- */
-const char *
-gcry_md_algo_name( int algo )
-{
- const char *s = digest_algo_to_string( algo );
- return s? s: "?";
-}
-
-
-static int
-check_digest_algo( int algo )
-{
- struct md_digest_list_s *r;
-
- do {
- for(r = digest_list; r; r = r->next )
- if( r->algo == algo )
- return 0;
- } while( !r && load_digest_module(algo) );
- return GCRYERR_INV_MD_ALGO;
-}
-
-
-
-/****************
- * Open a message digest handle for use with algorithm ALGO.
- * More algorithms may be added by md_enable(). The initial algorithm
- * may be 0.
- */
-static GCRY_MD_HD
-md_open( int algo, int secure, int hmac )
-{
- GCRY_MD_HD hd;
- struct gcry_md_context *ctx;
- int bufsize = secure? 512 : 1024;
- size_t n;
-
- /* Allocate a memory area to hold the caller visible buffer with it's
- * control information and the data required by this module. Set the
- * context pointer at the beginning to this area.
- * We have to use this strange scheme because we want to hide the
- * internal data but have a variable sized buffer.
- *
- * +---+------+---........------+-------------+
- * !ctx! bctl ! buffer ! private !
- * +---+------+---........------+-------------+
- * ! ^
- * !---------------------------!
- *
- * We have to make sture that private is well aligned.
- */
- n = sizeof( struct gcry_md_handle ) + bufsize;
- n = ((n + sizeof(PROPERLY_ALIGNED_TYPE)-1)
- / sizeof(PROPERLY_ALIGNED_TYPE) ) * sizeof(PROPERLY_ALIGNED_TYPE);
-
- /* allocate and set the Context pointer to the private data */
- hd = secure ? g10_malloc_secure( n + sizeof( struct gcry_md_context ) )
- : g10_malloc( n + sizeof( struct gcry_md_context ) );
- if( !hd ) {
- set_lasterr( GCRYERR_NO_MEM );
- return NULL;
- }
-
- hd->ctx = ctx = (struct gcry_md_context*)( (char*)hd + n );
- /* setup the globally visible data (bctl in the diagram)*/
- hd->bufsize = n - sizeof( struct gcry_md_handle ) + 1;
- hd->bufpos = 0;
- /* initialize the private data */
- memset( hd->ctx, 0, sizeof *hd->ctx );
- ctx->magic = secure ? CTX_MAGIC_SECURE : CTX_MAGIC_NORMAL;
- ctx->secure = secure;
- if( hmac ) {
- ctx->macpads = g10_malloc_secure( 128 );
- if( !ctx->macpads ) {
- md_close( hd );
- set_lasterr( GCRYERR_NO_MEM );
- return NULL;
- }
- }
- fast_random_poll(); /* FIXME: should we really do that? */
- if( algo && md_enable( hd, algo ) ) {
- md_close( hd );
- return NULL;
- }
- return hd;
-}
-
-
-GCRY_MD_HD
-gcry_md_open( int algo, unsigned int flags )
-{
- GCRY_MD_HD hd;
- /* fixme: check that algo is available and that only valid
- * flag values are used */
- hd = md_open( algo, (flags & GCRY_MD_FLAG_SECURE),
- (flags & GCRY_MD_FLAG_HMAC) );
- return hd;
-}
-
-
-
-static int
-md_enable( GCRY_MD_HD hd, int algo )
-{
- struct gcry_md_context *h = hd->ctx;
- struct md_digest_list_s *r, *ac;
-
- for( ac=h->list; ac; ac = ac->next )
- if( ac->algo == algo )
- return 0; /* already enabled */
- /* find the algorithm */
- do {
- for(r = digest_list; r; r = r->next )
- if( r->algo == algo )
- break;
- } while( !r && load_digest_module( algo ) );
- if( !r ) {
- log_debug("md_enable: algorithm %d not available\n", algo );
- return set_lasterr( GCRYERR_INV_MD_ALGO );
- }
- /* and allocate a new list entry */
- ac = h->secure? g10_malloc_secure( sizeof *ac + r->contextsize
- - sizeof(r->context) )
- : g10_malloc( sizeof *ac + r->contextsize
- - sizeof(r->context) );
- if( !ac )
- return set_lasterr( GCRYERR_NO_MEM );
-
- *ac = *r;
- ac->next = h->list;
- h->list = ac;
- /* and init this instance */
- (*ac->init)( &ac->context.c );
- return 0;
-}
-
-
-int
-gcry_md_enable( GCRY_MD_HD hd, int algo )
-{
- return md_enable( hd, algo );
-}
-
-static GCRY_MD_HD
-md_copy( GCRY_MD_HD ahd )
-{
- struct gcry_md_context *a = ahd->ctx;
- struct gcry_md_context *b;
- GCRY_MD_HD bhd;
- struct md_digest_list_s *ar, *br;
- size_t n;
-
- if( ahd->bufpos )
- md_write( ahd, NULL, 0 );
-
- n = (char*)ahd->ctx - (char*)ahd;
- bhd = a->secure ? g10_malloc_secure( n + sizeof( struct gcry_md_context ) )
- : g10_malloc( n + sizeof( struct gcry_md_context ) );
- if( !bhd ) {
- set_lasterr( GCRYERR_NO_MEM );
- return NULL;
- }
-
- bhd->ctx = b = (struct gcry_md_context*)( (char*)bhd + n );
- /* no need to copy the buffer due to the write above */
- assert( ahd->bufsize == (n - sizeof( struct gcry_md_handle ) + 1) );
- bhd->bufsize = ahd->bufsize;
- bhd->bufpos = 0; assert( !ahd->bufpos );
- memcpy( b, a, sizeof *a );
- b->list = NULL;
- b->debug = NULL;
- if( a->macpads ) {
- b->macpads = g10_malloc_secure( 128 );
- memcpy( b->macpads, a->macpads, 128 );
- }
- /* and now copy the complete list of algorithms */
- /* I know that the copied list is reversed, but that doesn't matter */
- for( ar=a->list; ar; ar = ar->next ) {
- br = a->secure ? g10_xmalloc_secure( sizeof *br + ar->contextsize
- - sizeof(ar->context) )
- : g10_xmalloc( sizeof *br + ar->contextsize
- - sizeof(ar->context) );
- memcpy( br, ar, sizeof(*br) + ar->contextsize
- - sizeof(ar->context) );
- br->next = b->list;
- b->list = br;
- }
-
- if( a->debug )
- md_start_debug( bhd, "unknown" );
- return bhd;
-}
-
-GCRY_MD_HD
-gcry_md_copy( GCRY_MD_HD hd )
-{
- return md_copy( hd );
-}
-
-/****************
- * Reset all contexts and discard any buffered stuff. This may be used
- * instead of a md_close(); md_open().
- */
-void
-gcry_md_reset( GCRY_MD_HD a )
-{
- struct md_digest_list_s *r;
-
- a->bufpos = a->ctx->finalized = 0;
- for( r=a->ctx->list; r; r = r->next ) {
- memset( r->context.c, 0, r->contextsize );
- (*r->init)( &r->context.c );
- }
- if( a->ctx->macpads ) {
- md_write( a, a->ctx->macpads, 64 ); /* inner pad */
- }
-}
-
-
-static void
-md_close(GCRY_MD_HD a)
-{
- struct md_digest_list_s *r, *r2;
-
- if( !a )
- return;
- if( a->ctx->debug )
- md_stop_debug(a);
- for(r=a->ctx->list; r; r = r2 ) {
- r2 = r->next;
- g10_free(r);
- }
- g10_free(a->ctx->macpads);
- g10_free(a);
-}
-
-
-void
-gcry_md_close( GCRY_MD_HD hd )
-{
- md_close( hd );
-}
-
-
-static void
-md_write( GCRY_MD_HD a, byte *inbuf, size_t inlen)
-{
- struct md_digest_list_s *r;
-
- if( a->ctx->debug ) {
- if( a->bufpos && fwrite(a->buf, a->bufpos, 1, a->ctx->debug ) != 1 )
- BUG();
- if( inlen && fwrite(inbuf, inlen, 1, a->ctx->debug ) != 1 )
- BUG();
- }
- for(r=a->ctx->list; r; r = r->next ) {
- if( a->bufpos )
- (*r->write)( &r->context.c, a->buf, a->bufpos );
- (*r->write)( &r->context.c, inbuf, inlen );
- }
- a->bufpos = 0;
-}
-
-
-void
-gcry_md_write( GCRY_MD_HD hd, const byte *inbuf, size_t inlen)
-{
- md_write( hd, (byte*)inbuf, inlen );
-}
-
-
-
-static void
-md_final(GCRY_MD_HD a)
-{
- struct md_digest_list_s *r;
-
- if( a->ctx->finalized )
- return;
-
- if( a->bufpos )
- md_write( a, NULL, 0 );
-
- for(r=a->ctx->list; r; r = r->next ) {
- (*r->final)( &r->context.c );
- }
- a->ctx->finalized = 1;
- if( a->ctx->macpads ) { /* finish the hmac */
- int algo = md_get_algo( a );
- byte *p = md_read( a, algo );
- size_t dlen = md_digest_length(algo);
-
- GCRY_MD_HD om = md_open( algo, a->ctx->secure, 0 );
- if( !om )
- g10_fatal_error( gcry_errno(), NULL );
- md_write( om, a->ctx->macpads+64, 64 );
- md_write( om, p, dlen );
- md_final( om );
- /* replace our digest with the mac (they have the same size) */
- memcpy( p, md_read( om, algo ), dlen );
- md_close( om );
- }
-}
-
-
-
-static int
-prepare_macpads( GCRY_MD_HD hd, byte *key, size_t keylen)
-{
- int i;
- int algo = md_get_algo( hd );
- byte *helpkey = NULL;
- byte *ipad, *opad;
-
- if( !algo )
- return GCRYERR_INV_MD_ALGO; /* i.e. no algo enabled */
-
- if( keylen > 64 ) {
- helpkey = g10_malloc_secure( md_digest_length( algo ) );
- if( !helpkey )
- return GCRYERR_NO_MEM;
- gcry_md_hash_buffer( algo, helpkey, key, keylen );
- key = helpkey;
- keylen = md_digest_length( algo );
- assert( keylen <= 64 );
- }
-
- memset( hd->ctx->macpads, 0, 128 );
- ipad = hd->ctx->macpads;
- opad = hd->ctx->macpads+64;
- memcpy( ipad, key, keylen );
- memcpy( opad, key, keylen );
- for(i=0; i < 64; i++ ) {
- ipad[i] ^= 0x36;
- opad[i] ^= 0x5c;
- }
- g10_free( helpkey );
- return 0;
-}
-
-int
-gcry_md_ctl( GCRY_MD_HD hd, int cmd, byte *buffer, size_t buflen)
-{
- int rc = 0;
- if( cmd == GCRYCTL_FINALIZE )
- md_final( hd );
- else if( cmd == GCRYCTL_SET_KEY ) {
- rc = gcry_md_setkey ( hd, buffer, buflen );
- }
- else if( cmd == GCRYCTL_START_DUMP ) {
- md_start_debug( hd, buffer );
- }
- else if( cmd == GCRYCTL_STOP_DUMP ) {
- md_stop_debug( hd );
- }
- else
- rc = GCRYERR_INV_OP;
- return set_lasterr( rc );
-}
-
-
-int
-gcry_md_setkey( GCRY_MD_HD hd, const char *key, size_t keylen )
-{
- int rc = 0;
-
- if( !(hd->ctx->macpads ) )
- rc = GCRYERR_CONFLICT;
- else if ( !(rc = prepare_macpads( hd, key, keylen )) )
- gcry_md_reset( hd );
-
- return rc;
-}
-
-
-/****************
- * if ALGO is null get the digest for the used algo (which should be only one)
- */
-static byte *
-md_read( GCRY_MD_HD a, int algo )
-{
- struct md_digest_list_s *r;
-
- if( !algo ) { /* return the first algorithm */
- if( (r=a->ctx->list) ) {
- if( r->next )
- log_debug("more than algorithm in md_read(0)\n");
- return (*r->read)( &r->context.c );
- }
- }
- else {
- for(r=a->ctx->list; r; r = r->next )
- if( r->algo == algo )
- return (*r->read)( &r->context.c );
- }
- BUG();
- return NULL;
-}
-
-/****************
- * Read out the complete digest, this function implictly finalizes
- * the hash.
- */
-byte *
-gcry_md_read( GCRY_MD_HD hd, int algo )
-{
- gcry_md_ctl( hd, GCRYCTL_FINALIZE, NULL, 0 );
- return md_read( hd, algo);
-}
-
-
-/****************
- * This function combines md_final and md_read but keeps the context
- * intact. This function can be used to calculate intermediate
- * digests. The digest is copied into buffer and the digestlength is
- * returned. If buffer is NULL only the needed size for buffer is returned.
- * buflen gives the max size of buffer. If the buffer is too shourt to
- * hold the complete digest, the buffer is filled with as many bytes are
- * possible and this value is returned.
- */
-#if 0
-static int
-md_digest( GCRY_MD_HD a, int algo, byte *buffer, int buflen )
-{
- struct md_digest_list_s *r = NULL;
- char *context;
- char *digest;
-
- if( a->bufpos )
- md_write( a, NULL, 0 );
-
- if( !algo ) { /* return digest for the first algorithm */
- if( (r=a->ctx->list) && r->next )
- log_debug("more than algorithm in md_digest(0)\n");
- }
- else {
- for(r=a->ctx->list; r; r = r->next )
- if( r->algo == algo )
- break;
- }
- if( !r )
- BUG();
-
- if( !buffer )
- return r->mdlen;
-
- /* I don't want to change the interface, so I simply work on a copy
- * of the context (extra overhead - should be fixed)*/
- context = a->ctx->secure ? g10_xmalloc_secure( r->contextsize )
- : g10_xmalloc( r->contextsize );
- memcpy( context, r->context.c, r->contextsize );
- (*r->final)( context );
- digest = (*r->read)( context );
-
- if( buflen > r->mdlen )
- buflen = r->mdlen;
- memcpy( buffer, digest, buflen );
-
- g10_free(context);
- return buflen;
-}
-#endif
-
-/****************
- * Read out an intermediate digest.
- */
-int
-gcry_md_get( GCRY_MD_HD hd, int algo, byte *buffer, int buflen )
-{
- /*md_digest ... */
- return GCRYERR_INTERNAL;
-}
-
-
-/****************
- * Shortcut function to hash a buffer with a given algo. The only supported
- * algorithm is RIPE-MD. The supplied digest buffer must be large enough
- * to store the resulting hash. No error is returned, the function will
- * abort on an invalid algo. DISABLED_ALGOS are ignored here.
- */
-void
-gcry_md_hash_buffer( int algo, char *digest, const char *buffer, size_t length)
-{
- if( algo == GCRY_MD_RMD160 )
- rmd160_hash_buffer( digest, buffer, length );
- else { /* for the others we do not have a fast function, so
- * we use the normal functions to do it */
- GCRY_MD_HD h = md_open( algo, 0, 0 );
- if( !h )
- BUG(); /* algo not available */
- md_write( h, (byte*)buffer, length );
- md_final( h );
- memcpy( digest, md_read( h, algo ), md_digest_length( algo ) );
- }
-}
-
-static int
-md_get_algo( GCRY_MD_HD a )
-{
- struct md_digest_list_s *r;
-
- if( (r=a->ctx->list) ) {
- if( r->next )
- log_error("WARNING: more than algorithm in md_get_algo()\n");
- return r->algo;
- }
- return 0;
-}
-
-
-int
-gcry_md_get_algo( GCRY_MD_HD hd )
-{
- return md_get_algo( hd ); /* fixme: we need error handling */
-}
-
-
-/****************
- * Return the length of the digest
- */
-static int
-md_digest_length( int algo )
-{
- struct md_digest_list_s *r;
-
- do {
- for(r = digest_list; r; r = r->next ) {
- if( r->algo == algo )
- return r->mdlen;
- }
- } while( !r && load_digest_module( algo ) );
- return 0;
-}
-
-/****************
- * Return the length of the digest in bytes.
- * This function will return 0 in case of errors.
- */
-unsigned int
-gcry_md_get_algo_dlen( int algo )
-{
- /* we do some very quick checks here */
- switch( algo )
- {
- case GCRY_MD_MD5: return 16;
- case GCRY_MD_SHA1:
- case GCRY_MD_RMD160: return 20;
- default: {
- int len = md_digest_length( algo );
- if( !len )
- set_lasterr( GCRYERR_INV_MD_ALGO );
- return 0;
- }
- }
-}
-
-
-/* Hmmm: add a mode to enumerate the OIDs
- * to make g10/sig-check.c more portable */
-static const byte *
-md_asn_oid( int algo, size_t *asnlen, size_t *mdlen )
-{
- struct md_digest_list_s *r;
-
- do {
- for(r = digest_list; r; r = r->next ) {
- if( r->algo == algo ) {
- if( asnlen )
- *asnlen = r->asnlen;
- if( mdlen )
- *mdlen = r->mdlen;
- return r->asnoid;
- }
- }
- } while( !r && load_digest_module( algo ) );
- log_bug("no asn for md algo %d\n", algo);
- return NULL;
-}
-
-
-
-/****************
- * Return information about the given cipher algorithm
- * WHAT select the kind of information returned:
- * GCRYCTL_TEST_ALGO:
- * Returns 0 when the specified algorithm is available for use.
- * buffer and nbytes must be zero.
- * GCRYCTL_GET_ASNOID:
- * Return the ASNOID of the algorithm in buffer. if buffer is NULL, only
- * the required length is returned.
- *
- * On error the value -1 is returned and the error reason may be
- * retrieved by gcry_errno().
- * Note: Because this function is in most caes used to return an
- * integer value, we can make it easier for the caller to just look at
- * the return value. The caller will in all cases consult the value
- * and thereby detecting whether a error occured or not (i.e. while checking
- * the block size)
- */
-int
-gcry_md_algo_info( int algo, int what, void *buffer, size_t *nbytes)
-{
- switch( what ) {
- case GCRYCTL_TEST_ALGO:
- if( buffer || nbytes ) {
- set_lasterr( GCRYERR_INV_ARG );
- return -1;
- }
- if( check_digest_algo( algo ) ) {
- set_lasterr( GCRYERR_INV_MD_ALGO );
- return -1;
- }
- break;
-
- case GCRYCTL_GET_ASNOID: {
- size_t asnlen;
- const char *asn = md_asn_oid( algo, &asnlen, NULL );
- if( buffer && *nbytes >= asnlen ) {
- memcpy( buffer, asn, asnlen );
- *nbytes = asnlen;
- return 0;
- }
- if( !buffer && nbytes ) {
- *nbytes = asnlen;
- return 0;
- }
- set_lasterr( buffer ? GCRYERR_TOO_SHORT : GCRYERR_INV_ARG );
- return -1;
- }
- break;
-
- default:
- set_lasterr( GCRYERR_INV_OP );
- return -1;
- }
- return 0;
-}
-
-
-
-
-static void
-md_start_debug( GCRY_MD_HD md, const char *suffix )
-{
- static int idx=0;
- char buf[25];
-
- if( md->ctx->debug ) {
- log_debug("Oops: md debug already started\n");
- return;
- }
- idx++;
- sprintf(buf, "dbgmd-%05d.%.10s", idx, suffix );
- md->ctx->debug = fopen(buf, "w");
- if( !md->ctx->debug )
- log_debug("md debug: can't open %s\n", buf );
-}
-
-static void
-md_stop_debug( GCRY_MD_HD md )
-{
- if( md->ctx->debug ) {
- if( md->bufpos )
- md_write( md, NULL, 0 );
- fclose(md->ctx->debug);
- md->ctx->debug = NULL;
- }
- #ifdef HAVE_U64_TYPEDEF
- { /* a kludge to pull in the __muldi3 for Solaris */
- volatile u32 a = (u32)(ulong)md;
- volatile u64 b = 42;
- volatile u64 c;
- c = a * b;
- }
- #endif
-}
-
-
-
-/****************
- * Return information about the digest handle.
- * GCRYCTL_IS_SECURE:
- * Returns 1 when the handle works on secured memory
- * otherwise 0 is returned. There is no error return.
- */
-int
-gcry_md_info( GCRY_MD_HD h, int cmd, void *buffer, size_t *nbytes)
-{
- switch( cmd ) {
- case GCRYCTL_IS_SECURE:
- return h->ctx->secure;
-
- default:
- set_lasterr( GCRYERR_INV_OP );
- return -1;
- }
- return 0;
-}
-
generated by cgit v1.2.3 (git 2.25.1) at 2025-04-29 12:29:45 +0000