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- /* coding.c
- *
- * Copyright (C) 2006-2011 Sawtooth Consulting Ltd.
- *
- * This file is part of CyaSSL.
- *
- * CyaSSL 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.
- *
- * CyaSSL 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 "coding.h"
- enum {
- BAD = 0xFF, /* invalid encoding */
- PAD = '=',
- PEM_LINE_SZ = 64
- };
- static
- const byte base64Decode[] = { 62, BAD, BAD, BAD, 63, /* + starts at 0x2B */
- 52, 53, 54, 55, 56, 57, 58, 59, 60, 61,
- BAD, BAD, BAD, BAD, BAD, BAD, BAD,
- 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,
- BAD, BAD, BAD, BAD, BAD, BAD,
- 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
- };
- int Base64Decode(const byte* in, word32 inLen, byte* out, word32* outLen)
- {
- word32 i = 0;
- word32 j = 0;
- word32 plainSz = inLen - ((inLen + (PEM_LINE_SZ - 1)) / PEM_LINE_SZ );
- plainSz = (plainSz * 3 + 3) / 4;
- if (plainSz > *outLen) return -1;
- while (inLen > 3) {
- byte b1, b2, b3;
- byte e1 = in[j++];
- byte e2 = in[j++];
- byte e3 = in[j++];
- byte e4 = in[j++];
- int pad3 = 0;
- int pad4 = 0;
- if (e1 == 0) /* end file 0's */
- break;
- if (e3 == PAD)
- pad3 = 1;
- if (e4 == PAD)
- pad4 = 1;
- e1 = base64Decode[e1 - 0x2B];
- e2 = base64Decode[e2 - 0x2B];
- e3 = (e3 == PAD) ? 0 : base64Decode[e3 - 0x2B];
- e4 = (e4 == PAD) ? 0 : base64Decode[e4 - 0x2B];
- b1 = (e1 << 2) | (e2 >> 4);
- b2 = ((e2 & 0xF) << 4) | (e3 >> 2);
- b3 = ((e3 & 0x3) << 6) | e4;
- out[i++] = b1;
- if (!pad3)
- out[i++] = b2;
- if (!pad4)
- out[i++] = b3;
- else
- break;
-
- inLen -= 4;
- if (in[j] == ' ' || in[j] == '\r' || in[j] == '\n') {
- byte endLine = in[j++];
- inLen--;
- while (endLine == ' ') { /* allow trailing whitespace */
- endLine = in[j++];
- inLen--;
- }
- if (endLine == '\r') {
- endLine = in[j++];
- inLen--;
- }
- if (endLine != '\n')
- return -1;
- }
- }
- *outLen = i;
- return 0;
- }
- #if defined(OPENSSL_EXTRA) || defined (SESSION_CERTS) || defined(CYASSL_KEY_GEN) || defined(CYASSL_CERT_GEN)
- static
- const byte base64Encode[] = { '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',
- '+', '/'
- };
- /* porting assistance from yaSSL by Raphael HUCK */
- int Base64Encode(const byte* in, word32 inLen, byte* out, word32* outLen)
- {
- word32 i = 0,
- j = 0,
- n = 0; /* new line counter */
- word32 outSz = (inLen + 3 - 1) / 3 * 4;
- outSz += (outSz + PEM_LINE_SZ - 1) / PEM_LINE_SZ; /* new lines */
- if (outSz > *outLen) return -1;
-
- while (inLen > 2) {
- byte b1 = in[j++];
- byte b2 = in[j++];
- byte b3 = in[j++];
- /* encoded idx */
- byte e1 = b1 >> 2;
- byte e2 = ((b1 & 0x3) << 4) | (b2 >> 4);
- byte e3 = ((b2 & 0xF) << 2) | (b3 >> 6);
- byte e4 = b3 & 0x3F;
- /* store */
- out[i++] = base64Encode[e1];
- out[i++] = base64Encode[e2];
- out[i++] = base64Encode[e3];
- out[i++] = base64Encode[e4];
- inLen -= 3;
- if ((++n % (PEM_LINE_SZ / 4)) == 0 && inLen)
- out[i++] = '\n';
- }
- /* last integral */
- if (inLen) {
- int twoBytes = (inLen == 2);
- byte b1 = in[j++];
- byte b2 = (twoBytes) ? in[j++] : 0;
- byte e1 = b1 >> 2;
- byte e2 = ((b1 & 0x3) << 4) | (b2 >> 4);
- byte e3 = (b2 & 0xF) << 2;
- out[i++] = base64Encode[e1];
- out[i++] = base64Encode[e2];
- out[i++] = (twoBytes) ? base64Encode[e3] : PAD;
- out[i++] = PAD;
- }
- out[i++] = '\n';
- if (i != outSz)
- return -1;
- *outLen = outSz;
- return 0;
- }
- static
- const byte hexDecode[] = { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9,
- BAD, BAD, BAD, BAD, BAD, BAD, BAD,
- 10, 11, 12, 13, 14, 15
- }; /* A starts at 0x41 not 0x3A */
- int Base16Decode(const byte* in, word32 inLen, byte* out, word32* outLen)
- {
- word32 inIdx = 0;
- word32 outIdx = 0;
- if (inLen % 2)
- return -1;
- if (*outLen < (inLen / 2))
- return -1;
- while (inLen) {
- byte b = in[inIdx++] - 0x30; /* 0 starts at 0x30 */
- byte b2 = in[inIdx++] - 0x30;
- /* sanity checks */
- if (b >= sizeof(hexDecode)/sizeof(hexDecode[0]))
- return -1;
- if (b2 >= sizeof(hexDecode)/sizeof(hexDecode[0]))
- return -1;
- b = hexDecode[b];
- b2 = hexDecode[b2];
- if (b == BAD || b2 == BAD)
- return -1;
-
- out[outIdx++] = (b << 4) | b2;
- inLen -= 2;
- }
- *outLen = outIdx;
- return 0;
- }
- #endif /* OPENSSL_EXTRA */
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