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108 lines
3.1 KiB
C
108 lines
3.1 KiB
C
/* lbase64.c - routines for dealing with base64 strings */
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/* $OpenLDAP$ */
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/* This work is part of OpenLDAP Software <http://www.openldap.org/>.
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*
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* Copyright 1998-2022 The OpenLDAP Foundation.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted only as authorized by the OpenLDAP
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* Public License.
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*
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* A copy of this license is available in the file LICENSE in the
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* top-level directory of the distribution or, alternatively, at
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* <http://www.OpenLDAP.org/license.html>.
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*/
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/* Portions Copyright (c) 1992-1996 Regents of the University of Michigan.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms are permitted
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* provided that this notice is preserved and that due credit is given
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* to the University of Michigan at Ann Arbor. The name of the
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* University may not be used to endorse or promote products derived
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* from this software without specific prior written permission. This
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* software is provided ``as is'' without express or implied warranty.
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*/
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/* This work was originally developed by the University of Michigan
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* and distributed as part of U-MICH LDAP.
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*/
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#include "portable.h"
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#include "ldap-int.h"
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#define RIGHT2 0x03
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#define RIGHT4 0x0f
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static const unsigned char b642nib[0x80] = {
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0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
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0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
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0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
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0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
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0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
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0xff, 0xff, 0xff, 0x3e, 0xff, 0xff, 0xff, 0x3f,
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0x34, 0x35, 0x36, 0x37, 0x38, 0x39, 0x3a, 0x3b,
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0x3c, 0x3d, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
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0xff, 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06,
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0x07, 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e,
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0x0f, 0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16,
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0x17, 0x18, 0x19, 0xff, 0xff, 0xff, 0xff, 0xff,
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0xff, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f, 0x20,
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0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27, 0x28,
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0x29, 0x2a, 0x2b, 0x2c, 0x2d, 0x2e, 0x2f, 0x30,
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0x31, 0x32, 0x33, 0xff, 0xff, 0xff, 0xff, 0xff
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};
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int
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ldap_int_decode_b64_inplace( struct berval *value )
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{
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char *p, *end, *byte;
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char nib;
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byte = value->bv_val;
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end = value->bv_val + value->bv_len;
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for ( p = value->bv_val, value->bv_len = 0;
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p < end;
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p += 4, value->bv_len += 3 )
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{
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int i;
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for ( i = 0; i < 4; i++ ) {
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if ( p[i] != '=' && (p[i] & 0x80 ||
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b642nib[ p[i] & 0x7f ] > 0x3f) ) {
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Debug2( LDAP_DEBUG_ANY,
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_("ldap_pvt_decode_b64_inplace: invalid base64 encoding"
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" char (%c) 0x%x\n"), p[i], p[i] );
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return( -1 );
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}
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}
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/* first digit */
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nib = b642nib[ p[0] & 0x7f ];
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byte[0] = nib << 2;
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/* second digit */
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nib = b642nib[ p[1] & 0x7f ];
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byte[0] |= nib >> 4;
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byte[1] = (nib & RIGHT4) << 4;
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/* third digit */
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if ( p[2] == '=' ) {
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value->bv_len += 1;
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break;
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}
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nib = b642nib[ p[2] & 0x7f ];
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byte[1] |= nib >> 2;
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byte[2] = (nib & RIGHT2) << 6;
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/* fourth digit */
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if ( p[3] == '=' ) {
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value->bv_len += 2;
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break;
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}
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nib = b642nib[ p[3] & 0x7f ];
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byte[2] |= nib;
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byte += 3;
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}
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value->bv_val[ value->bv_len ] = '\0';
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return LDAP_SUCCESS;
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}
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