| /* |
| * RFC 1521 base64 encoding/decoding |
| * |
| * Based on XySSL: Copyright (C) 2006-2008 Christophe Devine |
| * |
| * Copyright (C) 2009 Paul Bakker <polarssl_maintainer at polarssl dot org> |
| * |
| * All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * |
| * * Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * * Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in the |
| * documentation and/or other materials provided with the distribution. |
| * * Neither the names of PolarSSL or XySSL nor the names of its contributors |
| * may be used to endorse or promote products derived from this software |
| * without specific prior written permission. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS |
| * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
| * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED |
| * TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR |
| * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF |
| * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING |
| * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS |
| * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| */ |
| |
| #include "polarssl/config.h" |
| |
| #if defined(POLARSSL_BASE64_C) |
| |
| #include "polarssl/base64.h" |
| |
| static const unsigned char base64_enc_map[64] = |
| { |
| 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', |
| 'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R', 'S', 'T', |
| 'U', 'V', 'W', 'X', 'Y', 'Z', 'a', 'b', 'c', 'd', |
| 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', |
| 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', |
| 'y', 'z', '0', '1', '2', '3', '4', '5', '6', '7', |
| '8', '9', '+', '/' |
| }; |
| |
| static const unsigned char base64_dec_map[128] = |
| { |
| 127, 127, 127, 127, 127, 127, 127, 127, 127, 127, |
| 127, 127, 127, 127, 127, 127, 127, 127, 127, 127, |
| 127, 127, 127, 127, 127, 127, 127, 127, 127, 127, |
| 127, 127, 127, 127, 127, 127, 127, 127, 127, 127, |
| 127, 127, 127, 62, 127, 127, 127, 63, 52, 53, |
| 54, 55, 56, 57, 58, 59, 60, 61, 127, 127, |
| 127, 64, 127, 127, 127, 0, 1, 2, 3, 4, |
| 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, |
| 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, |
| 25, 127, 127, 127, 127, 127, 127, 26, 27, 28, |
| 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, |
| 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, |
| 49, 50, 51, 127, 127, 127, 127, 127 |
| }; |
| |
| /* |
| * Encode a buffer into base64 format |
| */ |
| int base64_encode( unsigned char *dst, int *dlen, |
| unsigned char *src, int slen ) |
| { |
| int i, n; |
| int C1, C2, C3; |
| unsigned char *p; |
| |
| if( slen == 0 ) |
| return( 0 ); |
| |
| n = (slen << 3) / 6; |
| |
| switch( (slen << 3) - (n * 6) ) |
| { |
| case 2: n += 3; break; |
| case 4: n += 2; break; |
| default: break; |
| } |
| |
| if( *dlen < n + 1 ) |
| { |
| *dlen = n + 1; |
| return( POLARSSL_ERR_BASE64_BUFFER_TOO_SMALL ); |
| } |
| |
| n = (slen / 3) * 3; |
| |
| for( i = 0, p = dst; i < n; i += 3 ) |
| { |
| C1 = *src++; |
| C2 = *src++; |
| C3 = *src++; |
| |
| *p++ = base64_enc_map[(C1 >> 2) & 0x3F]; |
| *p++ = base64_enc_map[(((C1 & 3) << 4) + (C2 >> 4)) & 0x3F]; |
| *p++ = base64_enc_map[(((C2 & 15) << 2) + (C3 >> 6)) & 0x3F]; |
| *p++ = base64_enc_map[C3 & 0x3F]; |
| } |
| |
| if( i < slen ) |
| { |
| C1 = *src++; |
| C2 = ((i + 1) < slen) ? *src++ : 0; |
| |
| *p++ = base64_enc_map[(C1 >> 2) & 0x3F]; |
| *p++ = base64_enc_map[(((C1 & 3) << 4) + (C2 >> 4)) & 0x3F]; |
| |
| if( (i + 1) < slen ) |
| *p++ = base64_enc_map[((C2 & 15) << 2) & 0x3F]; |
| else *p++ = '='; |
| |
| *p++ = '='; |
| } |
| |
| *dlen = p - dst; |
| *p = 0; |
| |
| return( 0 ); |
| } |
| |
| /* |
| * Decode a base64-formatted buffer |
| */ |
| int base64_decode( unsigned char *dst, int *dlen, |
| unsigned char *src, int slen ) |
| { |
| int i, j, n; |
| unsigned long x; |
| unsigned char *p; |
| |
| for( i = j = n = 0; i < slen; i++ ) |
| { |
| if( ( slen - i ) >= 2 && |
| src[i] == '\r' && src[i + 1] == '\n' ) |
| continue; |
| |
| if( src[i] == '\n' ) |
| continue; |
| |
| if( src[i] == '=' && ++j > 2 ) |
| return( POLARSSL_ERR_BASE64_INVALID_CHARACTER ); |
| |
| if( src[i] > 127 || base64_dec_map[src[i]] == 127 ) |
| return( POLARSSL_ERR_BASE64_INVALID_CHARACTER ); |
| |
| if( base64_dec_map[src[i]] < 64 && j != 0 ) |
| return( POLARSSL_ERR_BASE64_INVALID_CHARACTER ); |
| |
| n++; |
| } |
| |
| if( n == 0 ) |
| return( 0 ); |
| |
| n = ((n * 6) + 7) >> 3; |
| |
| if( *dlen < n ) |
| { |
| *dlen = n; |
| return( POLARSSL_ERR_BASE64_BUFFER_TOO_SMALL ); |
| } |
| |
| for( j = 3, n = x = 0, p = dst; i > 0; i--, src++ ) |
| { |
| if( *src == '\r' || *src == '\n' ) |
| continue; |
| |
| j -= ( base64_dec_map[*src] == 64 ); |
| x = (x << 6) | ( base64_dec_map[*src] & 0x3F ); |
| |
| if( ++n == 4 ) |
| { |
| n = 0; |
| if( j > 0 ) *p++ = (unsigned char)( x >> 16 ); |
| if( j > 1 ) *p++ = (unsigned char)( x >> 8 ); |
| if( j > 2 ) *p++ = (unsigned char)( x ); |
| } |
| } |
| |
| *dlen = p - dst; |
| |
| return( 0 ); |
| } |
| |
| #if defined(POLARSSL_SELF_TEST) |
| |
| #include <string.h> |
| #include <stdio.h> |
| |
| static const unsigned char base64_test_dec[64] = |
| { |
| 0x24, 0x48, 0x6E, 0x56, 0x87, 0x62, 0x5A, 0xBD, |
| 0xBF, 0x17, 0xD9, 0xA2, 0xC4, 0x17, 0x1A, 0x01, |
| 0x94, 0xED, 0x8F, 0x1E, 0x11, 0xB3, 0xD7, 0x09, |
| 0x0C, 0xB6, 0xE9, 0x10, 0x6F, 0x22, 0xEE, 0x13, |
| 0xCA, 0xB3, 0x07, 0x05, 0x76, 0xC9, 0xFA, 0x31, |
| 0x6C, 0x08, 0x34, 0xFF, 0x8D, 0xC2, 0x6C, 0x38, |
| 0x00, 0x43, 0xE9, 0x54, 0x97, 0xAF, 0x50, 0x4B, |
| 0xD1, 0x41, 0xBA, 0x95, 0x31, 0x5A, 0x0B, 0x97 |
| }; |
| |
| static const unsigned char base64_test_enc[] = |
| "JEhuVodiWr2/F9mixBcaAZTtjx4Rs9cJDLbpEG8i7hPK" |
| "swcFdsn6MWwINP+Nwmw4AEPpVJevUEvRQbqVMVoLlw=="; |
| |
| /* |
| * Checkup routine |
| */ |
| int base64_self_test( int verbose ) |
| { |
| int len; |
| unsigned char *src, buffer[128]; |
| |
| if( verbose != 0 ) |
| printf( " Base64 encoding test: " ); |
| |
| len = sizeof( buffer ); |
| src = (unsigned char *) base64_test_dec; |
| |
| if( base64_encode( buffer, &len, src, 64 ) != 0 || |
| memcmp( base64_test_enc, buffer, 88 ) != 0 ) |
| { |
| if( verbose != 0 ) |
| printf( "failed\n" ); |
| |
| return( 1 ); |
| } |
| |
| if( verbose != 0 ) |
| printf( "passed\n Base64 decoding test: " ); |
| |
| len = sizeof( buffer ); |
| src = (unsigned char *) base64_test_enc; |
| |
| if( base64_decode( buffer, &len, src, 88 ) != 0 || |
| memcmp( base64_test_dec, buffer, 64 ) != 0 ) |
| { |
| if( verbose != 0 ) |
| printf( "failed\n" ); |
| |
| return( 1 ); |
| } |
| |
| if( verbose != 0 ) |
| printf( "passed\n\n" ); |
| |
| return( 0 ); |
| } |
| |
| #endif |
| |
| #endif |
