[388] | 1 | /* coding.c
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| 2 | *
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| 3 | * Copyright (C) 2006-2017 wolfSSL Inc.
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| 4 | *
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| 5 | * This file is part of wolfSSL.
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| 6 | *
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| 7 | * wolfSSL is free software; you can redistribute it and/or modify
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| 8 | * it under the terms of the GNU General Public License as published by
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| 9 | * the Free Software Foundation; either version 2 of the License, or
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| 10 | * (at your option) any later version.
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| 11 | *
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| 12 | * wolfSSL is distributed in the hope that it will be useful,
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| 13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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| 15 | * GNU General Public License for more details.
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| 16 | *
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| 17 | * You should have received a copy of the GNU General Public License
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| 18 | * along with this program; if not, write to the Free Software
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| 19 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1335, USA
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| 20 | */
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| 21 |
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| 22 |
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| 23 | #ifdef HAVE_CONFIG_H
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| 24 | #include <config.h>
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| 25 | #endif
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| 26 |
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| 27 | #include <wolfssl/wolfcrypt/settings.h>
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| 28 |
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| 29 | #ifndef NO_CODING
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| 30 |
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| 31 | #include <wolfssl/wolfcrypt/coding.h>
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| 32 | #include <wolfssl/wolfcrypt/error-crypt.h>
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| 33 | #include <wolfssl/wolfcrypt/logging.h>
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| 34 |
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| 35 |
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| 36 | enum {
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| 37 | BAD = 0xFF, /* invalid encoding */
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| 38 | PAD = '=',
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| 39 | PEM_LINE_SZ = 64,
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| 40 | BASE64_MIN = 0x2B,
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| 41 | BASE16_MIN = 0x30,
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| 42 | };
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| 43 |
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| 44 |
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| 45 | static
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| 46 | const byte base64Decode[] = { 62, BAD, BAD, BAD, 63, /* + starts at 0x2B */
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| 47 | 52, 53, 54, 55, 56, 57, 58, 59, 60, 61,
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| 48 | BAD, BAD, BAD, BAD, BAD, BAD, BAD,
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| 49 | 0, 1, 2, 3, 4, 5, 6, 7, 8, 9,
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| 50 | 10, 11, 12, 13, 14, 15, 16, 17, 18, 19,
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| 51 | 20, 21, 22, 23, 24, 25,
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| 52 | BAD, BAD, BAD, BAD, BAD, BAD,
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| 53 | 26, 27, 28, 29, 30, 31, 32, 33, 34, 35,
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| 54 | 36, 37, 38, 39, 40, 41, 42, 43, 44, 45,
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| 55 | 46, 47, 48, 49, 50, 51
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| 56 | };
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| 57 |
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| 58 |
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| 59 | int Base64_Decode(const byte* in, word32 inLen, byte* out, word32* outLen)
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| 60 | {
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| 61 | word32 i = 0;
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| 62 | word32 j = 0;
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| 63 | word32 plainSz = inLen - ((inLen + (PEM_LINE_SZ - 1)) / PEM_LINE_SZ );
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| 64 | const byte maxIdx = (byte)sizeof(base64Decode) + BASE64_MIN - 1;
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| 65 |
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| 66 | plainSz = (plainSz * 3 + 3) / 4;
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| 67 | if (plainSz > *outLen) return BAD_FUNC_ARG;
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| 68 |
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| 69 | while (inLen > 3) {
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| 70 | byte b1, b2, b3;
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| 71 | byte e1 = in[j++];
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| 72 | byte e2 = in[j++];
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| 73 | byte e3 = in[j++];
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| 74 | byte e4 = in[j++];
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| 75 |
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| 76 | int pad3 = 0;
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| 77 | int pad4 = 0;
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| 78 |
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| 79 | if (e1 == 0) /* end file 0's */
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| 80 | break;
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| 81 | if (e3 == PAD)
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| 82 | pad3 = 1;
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| 83 | if (e4 == PAD)
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| 84 | pad4 = 1;
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| 85 |
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| 86 | if (e1 < BASE64_MIN || e2 < BASE64_MIN || e3 < BASE64_MIN || e4 < BASE64_MIN) {
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| 87 | WOLFSSL_MSG("Bad Base64 Decode data, too small");
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| 88 | return ASN_INPUT_E;
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| 89 | }
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| 90 |
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| 91 | if (e1 > maxIdx || e2 > maxIdx || e3 > maxIdx || e4 > maxIdx) {
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| 92 | WOLFSSL_MSG("Bad Base64 Decode data, too big");
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| 93 | return ASN_INPUT_E;
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| 94 | }
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| 95 |
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| 96 | e1 = base64Decode[e1 - BASE64_MIN];
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| 97 | e2 = base64Decode[e2 - BASE64_MIN];
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| 98 | e3 = (e3 == PAD) ? 0 : base64Decode[e3 - BASE64_MIN];
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| 99 | e4 = (e4 == PAD) ? 0 : base64Decode[e4 - BASE64_MIN];
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| 100 |
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| 101 | b1 = (byte)((e1 << 2) | (e2 >> 4));
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| 102 | b2 = (byte)(((e2 & 0xF) << 4) | (e3 >> 2));
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| 103 | b3 = (byte)(((e3 & 0x3) << 6) | e4);
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| 104 |
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| 105 | out[i++] = b1;
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| 106 | if (!pad3)
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| 107 | out[i++] = b2;
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| 108 | if (!pad4)
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| 109 | out[i++] = b3;
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| 110 | else
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| 111 | break;
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| 112 |
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| 113 | inLen -= 4;
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| 114 | if (inLen && (in[j] == ' ' || in[j] == '\r' || in[j] == '\n')) {
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| 115 | byte endLine = in[j++];
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| 116 | inLen--;
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| 117 | while (inLen && endLine == ' ') { /* allow trailing whitespace */
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| 118 | endLine = in[j++];
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| 119 | inLen--;
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| 120 | }
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| 121 | if (endLine == '\r') {
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| 122 | if (inLen) {
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| 123 | endLine = in[j++];
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| 124 | inLen--;
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| 125 | }
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| 126 | }
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| 127 | if (endLine != '\n') {
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| 128 | WOLFSSL_MSG("Bad end of line in Base64 Decode");
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| 129 | return ASN_INPUT_E;
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| 130 | }
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| 131 | }
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| 132 | }
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| 133 | *outLen = i;
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| 134 |
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| 135 | return 0;
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| 136 | }
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| 137 |
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| 138 |
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| 139 | #if defined(WOLFSSL_BASE64_ENCODE)
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| 140 |
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| 141 | static
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| 142 | const byte base64Encode[] = { 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J',
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| 143 | 'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R', 'S', 'T',
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| 144 | 'U', 'V', 'W', 'X', 'Y', 'Z',
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| 145 | 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j',
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| 146 | 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't',
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| 147 | 'u', 'v', 'w', 'x', 'y', 'z',
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| 148 | '0', '1', '2', '3', '4', '5', '6', '7', '8', '9',
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| 149 | '+', '/'
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| 150 | };
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| 151 |
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| 152 |
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| 153 | /* make sure *i (idx) won't exceed max, store and possibly escape to out,
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| 154 | * raw means use e w/o decode, 0 on success */
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| 155 | static int CEscape(int escaped, byte e, byte* out, word32* i, word32 max,
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| 156 | int raw, int getSzOnly)
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| 157 | {
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| 158 | int doEscape = 0;
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| 159 | word32 needed = 1;
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| 160 | word32 idx = *i;
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| 161 |
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| 162 | byte basic;
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| 163 | byte plus = 0;
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| 164 | byte equals = 0;
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| 165 | byte newline = 0;
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| 166 |
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| 167 | if (raw)
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| 168 | basic = e;
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| 169 | else
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| 170 | basic = base64Encode[e];
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| 171 |
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| 172 | /* check whether to escape. Only escape for EncodeEsc */
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| 173 | if (escaped == WC_ESC_NL_ENC) {
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| 174 | switch ((char)basic) {
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| 175 | case '+' :
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| 176 | plus = 1;
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| 177 | doEscape = 1;
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| 178 | needed += 2;
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| 179 | break;
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| 180 | case '=' :
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| 181 | equals = 1;
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| 182 | doEscape = 1;
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| 183 | needed += 2;
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| 184 | break;
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| 185 | case '\n' :
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| 186 | newline = 1;
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| 187 | doEscape = 1;
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| 188 | needed += 2;
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| 189 | break;
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| 190 | default:
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| 191 | /* do nothing */
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| 192 | break;
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| 193 | }
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| 194 | }
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| 195 |
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| 196 | /* check size */
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| 197 | if ( (idx+needed) > max && !getSzOnly) {
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| 198 | WOLFSSL_MSG("Escape buffer max too small");
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| 199 | return BUFFER_E;
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| 200 | }
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| 201 |
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| 202 | /* store it */
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| 203 | if (doEscape == 0) {
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| 204 | if(getSzOnly)
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| 205 | idx++;
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| 206 | else
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| 207 | out[idx++] = basic;
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| 208 | }
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| 209 | else {
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| 210 | if(getSzOnly)
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| 211 | idx+=3;
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| 212 | else {
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| 213 | out[idx++] = '%'; /* start escape */
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| 214 |
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| 215 | if (plus) {
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| 216 | out[idx++] = '2';
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| 217 | out[idx++] = 'B';
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| 218 | }
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| 219 | else if (equals) {
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| 220 | out[idx++] = '3';
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| 221 | out[idx++] = 'D';
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| 222 | }
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| 223 | else if (newline) {
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| 224 | out[idx++] = '0';
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| 225 | out[idx++] = 'A';
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| 226 | }
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| 227 | }
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| 228 | }
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| 229 | *i = idx;
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| 230 |
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| 231 | return 0;
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| 232 | }
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| 233 |
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| 234 |
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| 235 | /* internal worker, handles both escaped and normal line endings.
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| 236 | If out buffer is NULL, will return sz needed in outLen */
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| 237 | static int DoBase64_Encode(const byte* in, word32 inLen, byte* out,
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| 238 | word32* outLen, int escaped)
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| 239 | {
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| 240 | int ret = 0;
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| 241 | word32 i = 0,
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| 242 | j = 0,
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| 243 | n = 0; /* new line counter */
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| 244 |
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| 245 | int getSzOnly = (out == NULL);
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| 246 |
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| 247 | word32 outSz = (inLen + 3 - 1) / 3 * 4;
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| 248 | word32 addSz = (outSz + PEM_LINE_SZ - 1) / PEM_LINE_SZ; /* new lines */
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| 249 |
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| 250 | if (escaped == WC_ESC_NL_ENC)
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| 251 | addSz *= 3; /* instead of just \n, we're doing %0A triplet */
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| 252 | else if (escaped == WC_NO_NL_ENC)
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| 253 | addSz = 0; /* encode without \n */
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| 254 |
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| 255 | outSz += addSz;
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| 256 |
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| 257 | /* if escaped we can't predetermine size for one pass encoding, but
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| 258 | * make sure we have enough if no escapes are in input
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| 259 | * Also need to ensure outLen valid before dereference */
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| 260 | if (!outLen || (outSz > *outLen && !getSzOnly)) return BAD_FUNC_ARG;
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| 261 |
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| 262 | while (inLen > 2) {
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| 263 | byte b1 = in[j++];
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| 264 | byte b2 = in[j++];
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| 265 | byte b3 = in[j++];
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| 266 |
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| 267 | /* encoded idx */
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| 268 | byte e1 = b1 >> 2;
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| 269 | byte e2 = (byte)(((b1 & 0x3) << 4) | (b2 >> 4));
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| 270 | byte e3 = (byte)(((b2 & 0xF) << 2) | (b3 >> 6));
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| 271 | byte e4 = b3 & 0x3F;
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| 272 |
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| 273 | /* store */
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| 274 | ret = CEscape(escaped, e1, out, &i, *outLen, 0, getSzOnly);
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| 275 | if (ret != 0) break;
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| 276 | ret = CEscape(escaped, e2, out, &i, *outLen, 0, getSzOnly);
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| 277 | if (ret != 0) break;
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| 278 | ret = CEscape(escaped, e3, out, &i, *outLen, 0, getSzOnly);
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| 279 | if (ret != 0) break;
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| 280 | ret = CEscape(escaped, e4, out, &i, *outLen, 0, getSzOnly);
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| 281 | if (ret != 0) break;
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| 282 |
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| 283 | inLen -= 3;
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| 284 |
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| 285 | /* Insert newline after PEM_LINE_SZ, unless no \n requested */
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| 286 | if (escaped != WC_NO_NL_ENC && (++n % (PEM_LINE_SZ/4)) == 0 && inLen){
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| 287 | ret = CEscape(escaped, '\n', out, &i, *outLen, 1, getSzOnly);
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| 288 | if (ret != 0) break;
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| 289 | }
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| 290 | }
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| 291 |
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| 292 | /* last integral */
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| 293 | if (inLen && ret == 0) {
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| 294 | int twoBytes = (inLen == 2);
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| 295 |
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| 296 | byte b1 = in[j++];
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| 297 | byte b2 = (twoBytes) ? in[j++] : 0;
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| 298 |
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| 299 | byte e1 = b1 >> 2;
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| 300 | byte e2 = (byte)(((b1 & 0x3) << 4) | (b2 >> 4));
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| 301 | byte e3 = (byte)((b2 & 0xF) << 2);
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| 302 |
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| 303 | ret = CEscape(escaped, e1, out, &i, *outLen, 0, getSzOnly);
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| 304 | if (ret == 0)
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| 305 | ret = CEscape(escaped, e2, out, &i, *outLen, 0, getSzOnly);
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| 306 | if (ret == 0) {
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| 307 | /* third */
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| 308 | if (twoBytes)
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| 309 | ret = CEscape(escaped, e3, out, &i, *outLen, 0, getSzOnly);
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| 310 | else
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| 311 | ret = CEscape(escaped, '=', out, &i, *outLen, 1, getSzOnly);
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| 312 | }
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| 313 | /* fourth always pad */
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| 314 | if (ret == 0)
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| 315 | ret = CEscape(escaped, '=', out, &i, *outLen, 1, getSzOnly);
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| 316 | }
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| 317 |
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| 318 | if (ret == 0 && escaped != WC_NO_NL_ENC)
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| 319 | ret = CEscape(escaped, '\n', out, &i, *outLen, 1, getSzOnly);
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| 320 |
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| 321 | if (i != outSz && escaped != 1 && ret == 0)
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| 322 | return ASN_INPUT_E;
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| 323 |
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| 324 | *outLen = i;
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| 325 | if(ret == 0)
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| 326 | return getSzOnly ? LENGTH_ONLY_E : 0;
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| 327 | return ret;
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| 328 | }
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| 329 |
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| 330 |
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| 331 | /* Base64 Encode, PEM style, with \n line endings */
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| 332 | int Base64_Encode(const byte* in, word32 inLen, byte* out, word32* outLen)
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| 333 | {
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| 334 | return DoBase64_Encode(in, inLen, out, outLen, WC_STD_ENC);
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| 335 | }
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| 336 |
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| 337 |
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| 338 | /* Base64 Encode, with %0A escaped line endings instead of \n */
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| 339 | int Base64_EncodeEsc(const byte* in, word32 inLen, byte* out, word32* outLen)
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| 340 | {
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| 341 | return DoBase64_Encode(in, inLen, out, outLen, WC_ESC_NL_ENC);
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| 342 | }
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| 343 |
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| 344 | int Base64_Encode_NoNl(const byte* in, word32 inLen, byte* out, word32* outLen)
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| 345 | {
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| 346 | return DoBase64_Encode(in, inLen, out, outLen, WC_NO_NL_ENC);
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| 347 | }
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| 348 |
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| 349 | #endif /* WOLFSSL_BASE64_ENCODE */
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| 350 |
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| 351 |
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| 352 | #ifdef WOLFSSL_BASE16
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| 353 |
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| 354 | static
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| 355 | const byte hexDecode[] = { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9,
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| 356 | BAD, BAD, BAD, BAD, BAD, BAD, BAD,
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| 357 | 10, 11, 12, 13, 14, 15, /* upper case A-F */
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| 358 | BAD, BAD, BAD, BAD, BAD, BAD, BAD, BAD,
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| 359 | BAD, BAD, BAD, BAD, BAD, BAD, BAD, BAD,
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| 360 | BAD, BAD, BAD, BAD, BAD, BAD, BAD, BAD,
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| 361 | BAD, BAD, /* G - ` */
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| 362 | 10, 11, 12, 13, 14, 15 /* lower case a-f */
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| 363 | }; /* A starts at 0x41 not 0x3A */
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| 364 |
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| 365 | int Base16_Decode(const byte* in, word32 inLen, byte* out, word32* outLen)
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| 366 | {
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| 367 | word32 inIdx = 0;
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| 368 | word32 outIdx = 0;
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| 369 |
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| 370 | if (in == NULL || out == NULL || outLen == NULL)
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| 371 | return BAD_FUNC_ARG;
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| 372 |
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| 373 | if (inLen == 1 && *outLen && in) {
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| 374 | byte b = in[inIdx++] - BASE16_MIN; /* 0 starts at 0x30 */
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| 375 |
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| 376 | /* sanity check */
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| 377 | if (b >= sizeof(hexDecode)/sizeof(hexDecode[0]))
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| 378 | return ASN_INPUT_E;
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| 379 |
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| 380 | b = hexDecode[b];
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| 381 |
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| 382 | if (b == BAD)
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| 383 | return ASN_INPUT_E;
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| 384 |
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| 385 | out[outIdx++] = b;
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| 386 |
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| 387 | *outLen = outIdx;
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| 388 | return 0;
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| 389 | }
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| 390 |
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| 391 | if (inLen % 2)
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| 392 | return BAD_FUNC_ARG;
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| 393 |
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| 394 | if (*outLen < (inLen / 2))
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| 395 | return BAD_FUNC_ARG;
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| 396 |
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| 397 | while (inLen) {
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| 398 | byte b = in[inIdx++] - BASE16_MIN; /* 0 starts at 0x30 */
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| 399 | byte b2 = in[inIdx++] - BASE16_MIN;
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| 400 |
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| 401 | /* sanity checks */
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| 402 | if (b >= sizeof(hexDecode)/sizeof(hexDecode[0]))
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| 403 | return ASN_INPUT_E;
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| 404 | if (b2 >= sizeof(hexDecode)/sizeof(hexDecode[0]))
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| 405 | return ASN_INPUT_E;
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| 406 |
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| 407 | b = hexDecode[b];
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| 408 | b2 = hexDecode[b2];
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| 409 |
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| 410 | if (b == BAD || b2 == BAD)
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| 411 | return ASN_INPUT_E;
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| 412 |
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| 413 | out[outIdx++] = (byte)((b << 4) | b2);
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| 414 | inLen -= 2;
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| 415 | }
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| 416 |
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| 417 | *outLen = outIdx;
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| 418 | return 0;
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| 419 | }
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| 420 |
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| 421 | int Base16_Encode(const byte* in, word32 inLen, byte* out, word32* outLen)
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| 422 | {
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| 423 | word32 outIdx = 0;
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| 424 | word32 i;
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| 425 | byte hb, lb;
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| 426 |
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| 427 | if (in == NULL || out == NULL || outLen == NULL)
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| 428 | return BAD_FUNC_ARG;
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| 429 |
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| 430 | if (*outLen < (2 * inLen + 1))
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| 431 | return BAD_FUNC_ARG;
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| 432 |
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| 433 | for (i = 0; i < inLen; i++) {
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| 434 | hb = in[i] >> 4;
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| 435 | lb = in[i] & 0x0f;
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| 436 |
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| 437 | /* ASCII value */
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| 438 | hb += '0';
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| 439 | if (hb > '9')
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| 440 | hb += 7;
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| 441 |
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| 442 | /* ASCII value */
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| 443 | lb += '0';
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| 444 | if (lb>'9')
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| 445 | lb += 7;
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| 446 |
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| 447 | out[outIdx++] = hb;
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| 448 | out[outIdx++] = lb;
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| 449 | }
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| 450 |
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| 451 | /* force 0 at this end */
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| 452 | out[outIdx++] = 0;
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| 453 |
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| 454 | *outLen = outIdx;
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| 455 | return 0;
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| 456 | }
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| 457 |
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| 458 | #endif /* WOLFSSL_BASE16 */
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| 459 |
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| 460 | #endif /* !NO_CODING */
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