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Annotation of qemu/roms/ipxe/src/crypto/chap.c, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (C) 2006 Michael Brown <[email protected]>.
        !             3:  *
        !             4:  * This program is free software; you can redistribute it and/or
        !             5:  * modify it under the terms of the GNU General Public License as
        !             6:  * published by the Free Software Foundation; either version 2 of the
        !             7:  * License, or any later version.
        !             8:  *
        !             9:  * This program is distributed in the hope that it will be useful, but
        !            10:  * WITHOUT ANY WARRANTY; without even the implied warranty of
        !            11:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
        !            12:  * General Public License for more details.
        !            13:  *
        !            14:  * You should have received a copy of the GNU General Public License
        !            15:  * along with this program; if not, write to the Free Software
        !            16:  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
        !            17:  */
        !            18: 
        !            19: FILE_LICENCE ( GPL2_OR_LATER );
        !            20: 
        !            21: #include <stddef.h>
        !            22: #include <stdlib.h>
        !            23: #include <string.h>
        !            24: #include <errno.h>
        !            25: #include <assert.h>
        !            26: #include <ipxe/crypto.h>
        !            27: #include <ipxe/chap.h>
        !            28: 
        !            29: /** @file
        !            30:  *
        !            31:  * CHAP protocol
        !            32:  *
        !            33:  */
        !            34: 
        !            35: /**
        !            36:  * Initialise CHAP challenge/response
        !            37:  *
        !            38:  * @v chap             CHAP challenge/response
        !            39:  * @v digest           Digest algorithm to use
        !            40:  * @ret rc             Return status code
        !            41:  *
        !            42:  * Initialises a CHAP challenge/response structure.  This routine
        !            43:  * allocates memory, and so may fail.  The allocated memory must
        !            44:  * eventually be freed by a call to chap_finish().
        !            45:  */
        !            46: int chap_init ( struct chap_response *chap,
        !            47:                struct digest_algorithm *digest ) {
        !            48:        size_t state_len;
        !            49:        void *state;
        !            50: 
        !            51:        assert ( chap->digest == NULL );
        !            52:        assert ( chap->digest_context == NULL );
        !            53:        assert ( chap->response == NULL );
        !            54: 
        !            55:        DBG ( "CHAP %p initialising with %s digest\n", chap, digest->name );
        !            56: 
        !            57:        state_len = ( digest->ctxsize + digest->digestsize );
        !            58:        state = malloc ( state_len );
        !            59:        if ( ! state ) {
        !            60:                DBG ( "CHAP %p could not allocate %zd bytes for state\n",
        !            61:                      chap, state_len );
        !            62:                return -ENOMEM;
        !            63:        }
        !            64:        
        !            65:        chap->digest = digest;
        !            66:        chap->digest_context = state;
        !            67:        chap->response = ( state + digest->ctxsize );
        !            68:        chap->response_len = digest->digestsize;
        !            69:        digest_init ( chap->digest, chap->digest_context );
        !            70:        return 0;
        !            71: }
        !            72: 
        !            73: /**
        !            74:  * Add data to the CHAP challenge
        !            75:  *
        !            76:  * @v chap             CHAP response
        !            77:  * @v data             Data to add
        !            78:  * @v len              Length of data to add
        !            79:  */
        !            80: void chap_update ( struct chap_response *chap, const void *data,
        !            81:                   size_t len ) {
        !            82:        assert ( chap->digest != NULL );
        !            83:        assert ( chap->digest_context != NULL );
        !            84: 
        !            85:        if ( ! chap->digest )
        !            86:                return;
        !            87: 
        !            88:        digest_update ( chap->digest, chap->digest_context, data, len );
        !            89: }
        !            90: 
        !            91: /**
        !            92:  * Respond to the CHAP challenge
        !            93:  *
        !            94:  * @v chap             CHAP response
        !            95:  *
        !            96:  * Calculates the final CHAP response value, and places it in @c
        !            97:  * chap->response, with a length of @c chap->response_len.
        !            98:  */
        !            99: void chap_respond ( struct chap_response *chap ) {
        !           100:        assert ( chap->digest != NULL );
        !           101:        assert ( chap->digest_context != NULL );
        !           102:        assert ( chap->response != NULL );
        !           103: 
        !           104:        DBG ( "CHAP %p responding to challenge\n", chap );
        !           105: 
        !           106:        if ( ! chap->digest )
        !           107:                return;
        !           108: 
        !           109:        digest_final ( chap->digest, chap->digest_context, chap->response );
        !           110: }
        !           111: 
        !           112: /**
        !           113:  * Free resources used by a CHAP response
        !           114:  *
        !           115:  * @v chap             CHAP response
        !           116:  */
        !           117: void chap_finish ( struct chap_response *chap ) {
        !           118:        void *state = chap->digest_context;
        !           119: 
        !           120:        DBG ( "CHAP %p finished\n", chap );
        !           121: 
        !           122:        free ( state );
        !           123:        memset ( chap, 0, sizeof ( *chap ) );
        !           124: }

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