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/*
* Copyright (C) 2001, 2002, 2003, 2004, 2005, 2008, 2010 Free Software
* Foundation, Inc.
*
* Author: Nikos Mavrogiannopoulos
*
* This file is part of GnuTLS.
*
* The GnuTLS is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public License
* as published by the Free Software Foundation; either version 2.1 of
* the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
* USA
*
*/
#include <gnutls_int.h>
#include <gnutls_errors.h>
#include <gnutls_datum.h>
#include <auth_srp_passwd.h>
#ifdef ENABLE_SRP
/* this a modified base64 for srp !!!
* It seems that everybody makes an own base64 conversion.
*/
static const uint8_t b64table[] =
"0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz./";
static const uint8_t asciitable[128] = {
0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0x3e, 0x3f,
0x00, 0x01, 0x02, 0x03, 0x04, 0x05,
0x06, 0x07, 0x08, 0x09, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0x0a,
0x0b, 0x0c, 0x0d, 0x0e, 0x0f, 0x10,
0x11, 0x12, 0x13, 0x14, 0x15, 0x16,
0x17, 0x18, 0x19, 0x1a, 0x1b, 0x1c,
0x1d, 0x1e, 0x1f, 0x20, 0x21, 0x22,
0x23, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0x24, 0x25, 0x26, 0x27, 0x28,
0x29, 0x2a, 0x2b, 0x2c, 0x2d, 0x2e,
0x2f, 0x30, 0x31, 0x32, 0x33, 0x34,
0x35, 0x36, 0x37, 0x38, 0x39, 0x3a,
0x3b, 0x3c, 0x3d, 0xff, 0xff, 0xff,
0xff, 0xff
};
inline static int
encode (uint8_t * result, const uint8_t * rdata, int left)
{
int data_len;
int c, ret = 4;
uint8_t data[3];
if (left > 3)
data_len = 3;
else
data_len = left;
data[0] = data[1] = data[2] = 0;
memcpy (data, rdata, data_len);
switch (data_len)
{
case 3:
result[0] = b64table[((data[0] & 0xfc) >> 2)];
result[1] =
b64table[(((((data[0] & 0x03) & 0xff) << 4) & 0xff) |
((data[1] & 0xf0) >> 4))];
result[2] =
b64table[((((data[1] & 0x0f) << 2) & 0xff) |
((data[2] & 0xc0) >> 6))];
result[3] = b64table[(data[2] & 0x3f) & 0xff];
break;
case 2:
if ((c = ((data[0] & 0xf0) >> 4)) != 0)
{
result[0] = b64table[c];
result[1] =
b64table[((((data[0] & 0x0f) << 2) & 0xff) |
((data[1] & 0xc0) >> 6))];
result[2] = b64table[(data[1] & 0x3f) & 0xff];
result[3] = '\0';
ret -= 1;
}
else
{
if ((c = ((data[0] & 0x0f) << 2) | ((data[1] & 0xc0) >> 6)) != 0)
{
result[0] = b64table[c];
result[1] = b64table[data[1] & 0x3f];
result[2] = '\0';
result[3] = '\0';
ret -= 2;
}
else
{
result[0] = b64table[data[0] & 0x3f];
result[1] = '\0';
result[2] = '\0';
result[3] = '\0';
ret -= 3;
}
}
break;
case 1:
if ((c = ((data[0] & 0xc0) >> 6)) != 0)
{
result[0] = b64table[c];
result[1] = b64table[(data[0] & 0x3f) & 0xff];
result[2] = '\0';
result[3] = '\0';
ret -= 2;
}
else
{
result[0] = b64table[(data[0] & 0x3f) & 0xff];
result[1] = '\0';
result[2] = '\0';
result[3] = '\0';
ret -= 3;
}
break;
default:
return -1;
}
return ret;
}
/* encodes data and puts the result into result (locally allocated)
* The result_size is the return value
*/
static int
_gnutls_sbase64_encode (uint8_t * data, size_t data_size, uint8_t ** result)
{
unsigned i, j;
int ret, tmp;
opaque tmpres[4];
int mod = data_size % 3;
ret = mod;
if (ret != 0)
ret = 4;
else
ret = 0;
ret += (data_size * 4) / 3;
(*result) = gnutls_calloc (1, ret + 1);
if ((*result) == NULL)
return -1;
i = j = 0;
/* encode the bytes that are not a multiple of 3
*/
if (mod > 0)
{
tmp = encode (tmpres, &data[0], mod);
if (tmp < 0)
{
gnutls_free ((*result));
return tmp;
}
memcpy (&(*result)[0], tmpres, tmp);
i = mod;
j = tmp;
}
/* encode the rest
*/
for (; i < data_size; i += 3, j += 4)
{
tmp = encode (tmpres, &data[i], data_size - i);
if (tmp < 0)
{
gnutls_free ((*result));
return tmp;
}
memcpy (&(*result)[j], tmpres, tmp);
}
return strlen (*result);
}
/* data must be 4 bytes
* result should be 3 bytes
*/
#define TOASCII(c) (c < 127 ? asciitable[c] : 0xff)
inline static int
decode (uint8_t * result, const uint8_t * data)
{
uint8_t a1, a2;
int ret = 3;
memset (result, 0, 3);
a1 = TOASCII (data[3]);
a2 = TOASCII (data[2]);
if (a1 != 0xff)
result[2] = a1 & 0xff;
else
return -1;
if (a2 != 0xff)
result[2] |= ((a2 & 0x03) << 6) & 0xff;
a1 = a2;
a2 = TOASCII (data[1]);
if (a1 != 0xff)
result[1] = ((a1 & 0x3c) >> 2);
if (a2 != 0xff)
result[1] |= ((a2 & 0x0f) << 4);
else if (a1 == 0xff || result[1] == 0)
ret--;
a1 = a2;
a2 = TOASCII (data[0]);
if (a1 != 0xff)
result[0] = (((a1 & 0x30) >> 4) & 0xff);
if (a2 != 0xff)
result[0] |= ((a2 << 2) & 0xff);
else if (a1 == 0xff || result[0] == 0)
ret--;
return ret;
}
/* decodes data and puts the result into result (locally allocated)
* The result_size is the return value.
* That function does not ignore newlines tabs etc. You should remove them
* before calling it.
*/
int
_gnutls_sbase64_decode (uint8_t * data, size_t idata_size, uint8_t ** result)
{
unsigned i, j;
int ret, left;
int data_size, tmp;
uint8_t datrev[4];
uint8_t tmpres[3];
data_size = (idata_size / 4) * 4;
left = idata_size % 4;
ret = (data_size / 4) * 3;
if (left > 0)
ret += 3;
(*result) = gnutls_malloc (ret + 1);
if ((*result) == NULL)
return -1;
/* the first "block" is treated with special care */
tmp = 0;
if (left > 0)
{
memset (datrev, 0, 4);
memcpy (&datrev[4 - left], data, left);
tmp = decode (tmpres, datrev);
if (tmp < 0)
{
gnutls_free ((*result));
*result = NULL;
return tmp;
}
memcpy (*result, &tmpres[3 - tmp], tmp);
if (tmp < 3)
ret -= (3 - tmp);
}
/* rest data */
for (i = left, j = tmp; i < idata_size; i += 4)
{
tmp = decode (tmpres, &data[i]);
if (tmp < 0)
{
gnutls_free ((*result));
*result = NULL;
return tmp;
}
memcpy (&(*result)[j], tmpres, tmp);
if (tmp < 3)
ret -= (3 - tmp);
j += 3;
}
return ret;
}
/**
* gnutls_srp_base64_encode:
* @data: contain the raw data
* @result: the place where base64 data will be copied
* @result_size: holds the size of the result
*
* This function will convert the given data to printable data, using
* the base64 encoding, as used in the libsrp. This is the encoding
* used in SRP password files. If the provided buffer is not long
* enough GNUTLS_E_SHORT_MEMORY_BUFFER is returned.
*
* Warning! This base64 encoding is not the "standard" encoding, so
* do not use it for non-SRP purposes.
*
* Returns: %GNUTLS_E_SHORT_MEMORY_BUFFER if the buffer given is not
* long enough, or 0 on success.
**/
int
gnutls_srp_base64_encode (const gnutls_datum_t * data, char *result,
size_t * result_size)
{
opaque *ret;
int size;
size = _gnutls_sbase64_encode (data->data, data->size, &ret);
if (size < 0)
return size;
if (result == NULL || *result_size < (size_t) size)
{
gnutls_free (ret);
*result_size = size;
return GNUTLS_E_SHORT_MEMORY_BUFFER;
}
else
{
memcpy (result, ret, size);
gnutls_free (ret);
*result_size = size;
}
return 0;
}
/**
* gnutls_srp_base64_encode_alloc:
* @data: contains the raw data
* @result: will hold the newly allocated encoded data
*
* This function will convert the given data to printable data, using
* the base64 encoding. This is the encoding used in SRP password
* files. This function will allocate the required memory to hold
* the encoded data.
*
* You should use gnutls_free() to free the returned data.
*
* Warning! This base64 encoding is not the "standard" encoding, so
* do not use it for non-SRP purposes.
*
* Returns: 0 on success, or an error code.
**/
int
gnutls_srp_base64_encode_alloc (const gnutls_datum_t * data,
gnutls_datum_t * result)
{
opaque *ret;
int size;
size = _gnutls_sbase64_encode (data->data, data->size, &ret);
if (size < 0)
return size;
if (result == NULL)
{
gnutls_free (ret);
return GNUTLS_E_INVALID_REQUEST;
}
else
{
result->data = ret;
result->size = size;
}
return 0;
}
/**
* gnutls_srp_base64_decode:
* @b64_data: contain the encoded data
* @result: the place where decoded data will be copied
* @result_size: holds the size of the result
*
* This function will decode the given encoded data, using the base64
* encoding found in libsrp.
*
* Note that @b64_data should be null terminated.
*
* Warning! This base64 encoding is not the "standard" encoding, so
* do not use it for non-SRP purposes.
*
* Returns: %GNUTLS_E_SHORT_MEMORY_BUFFER if the buffer given is not
* long enough, or 0 on success.
**/
int
gnutls_srp_base64_decode (const gnutls_datum_t * b64_data, char *result,
size_t * result_size)
{
opaque *ret;
int size;
size = _gnutls_sbase64_decode (b64_data->data, b64_data->size, &ret);
if (size < 0)
return size;
if (result == NULL || *result_size < (size_t) size)
{
gnutls_free (ret);
*result_size = size;
return GNUTLS_E_SHORT_MEMORY_BUFFER;
}
else
{
memcpy (result, ret, size);
gnutls_free (ret);
*result_size = size;
}
return 0;
}
/**
* gnutls_srp_base64_decode_alloc:
* @b64_data: contains the encoded data
* @result: the place where decoded data lie
*
* This function will decode the given encoded data. The decoded data
* will be allocated, and stored into result. It will decode using
* the base64 algorithm as used in libsrp.
*
* You should use gnutls_free() to free the returned data.
*
* Warning! This base64 encoding is not the "standard" encoding, so
* do not use it for non-SRP purposes.
*
* Returns: 0 on success, or an error code.
**/
int
gnutls_srp_base64_decode_alloc (const gnutls_datum_t * b64_data,
gnutls_datum_t * result)
{
opaque *ret;
int size;
size = _gnutls_sbase64_decode (b64_data->data, b64_data->size, &ret);
if (size < 0)
return size;
if (result == NULL)
{
gnutls_free (ret);
return GNUTLS_E_INVALID_REQUEST;
}
else
{
result->data = ret;
result->size = size;
}
return 0;
}
#endif /* ENABLE_SRP */
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