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/* coding.c
*
* Copyright (C) 2006-2012 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
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <cyassl/ctaocrypt/coding.h>
#include <cyassl/ctaocrypt/error.h>
#include <cyassl/ctaocrypt/logging.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 Base64_Decode(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 );
const byte maxIdx = (byte)sizeof(base64Decode) + 0x2B - 1;
plainSz = (plainSz * 3 + 3) / 4;
if (plainSz > *outLen) return BAD_FUNC_ARG;
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;
if (e1 < 0x2B || e2 < 0x2B || e3 < 0x2B || e4 < 0x2B) {
CYASSL_MSG("Bad Base64 Decode data, too small");
return ASN_INPUT_E;
}
if (e1 > maxIdx || e2 > maxIdx || e3 > maxIdx || e4 > maxIdx) {
CYASSL_MSG("Bad Base64 Decode data, too big");
return ASN_INPUT_E;
}
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') {
CYASSL_MSG("Bad end of line in Base64 Decode");
return ASN_INPUT_E;
}
}
}
*outLen = i;
return 0;
}
#if defined(OPENSSL_EXTRA) || defined (SESSION_CERTS) || defined(CYASSL_KEY_GEN) || defined(CYASSL_CERT_GEN) || defined(HAVE_WEBSERVER)
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 Base64_Encode(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 BAD_FUNC_ARG;
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 ASN_INPUT_E;
*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 Base16_Decode(const byte* in, word32 inLen, byte* out, word32* outLen)
{
word32 inIdx = 0;
word32 outIdx = 0;
if (inLen == 1 && *outLen && in) {
byte b = in[inIdx++] - 0x30; /* 0 starts at 0x30 */
/* sanity check */
if (b >= sizeof(hexDecode)/sizeof(hexDecode[0]))
return ASN_INPUT_E;
b = hexDecode[b];
if (b == BAD)
return ASN_INPUT_E;
out[outIdx++] = b;
*outLen = outIdx;
return 0;
}
if (inLen % 2)
return BAD_FUNC_ARG;
if (*outLen < (inLen / 2))
return BAD_FUNC_ARG;
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 ASN_INPUT_E;
if (b2 >= sizeof(hexDecode)/sizeof(hexDecode[0]))
return ASN_INPUT_E;
b = hexDecode[b];
b2 = hexDecode[b2];
if (b == BAD || b2 == BAD)
return ASN_INPUT_E;
out[outIdx++] = (b << 4) | b2;
inLen -= 2;
}
*outLen = outIdx;
return 0;
}
#endif /* OPENSSL_EXTRA */
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