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/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#include <string.h>
#include "secitem.h"
#include "secport.h"
#include "secerr.h"
/* if to->data is not NULL, and to->len is large enough to hold the result,
* then the resultant OID will be copyed into to->data, and to->len will be
* changed to show the actual OID length.
* Otherwise, memory for the OID will be allocated (from the caller's
* PLArenaPool, if pool is non-NULL) and to->data will receive the address
* of the allocated data, and to->len will receive the OID length.
* The original value of to->data is not freed when a new buffer is allocated.
*
* The input string may begin with "OID." and this still be ignored.
* The length of the input string is given in len. If len == 0, then
* len will be computed as strlen(from), meaning it must be NUL terminated.
* It is an error if from == NULL, or if *from == '\0'.
*/
SECStatus
SEC_StringToOID(PLArenaPool *pool, SECItem *to, const char *from, PRUint32 len)
{
PRUint32 decimal_numbers = 0;
PRUint32 result_bytes = 0;
SECStatus rv;
PRUint8 result[1024];
static const PRUint32 max_decimal = (0xffffffff / 10);
static const char OIDstring[] = { "OID." };
if (!from || !to) {
PORT_SetError(SEC_ERROR_INVALID_ARGS);
return SECFailure;
}
if (!len) {
len = PL_strlen(from);
}
if (len >= 4 && !PL_strncasecmp(from, OIDstring, 4)) {
from += 4; /* skip leading "OID." if present */
len -= 4;
}
if (!len) {
bad_data:
PORT_SetError(SEC_ERROR_BAD_DATA);
return SECFailure;
}
do {
PRUint32 decimal = 0;
while (len > 0 && isdigit(*from)) {
PRUint32 addend = (*from++ - '0');
--len;
if (decimal > max_decimal) /* overflow */
goto bad_data;
decimal = (decimal * 10) + addend;
if (decimal < addend) /* overflow */
goto bad_data;
}
if (len != 0 && *from != '.') {
goto bad_data;
}
if (decimal_numbers == 0) {
if (decimal > 2)
goto bad_data;
result[0] = decimal * 40;
result_bytes = 1;
} else if (decimal_numbers == 1) {
if (decimal > 40)
goto bad_data;
result[0] += decimal;
} else {
/* encode the decimal number, */
PRUint8 *rp;
PRUint32 num_bytes = 0;
PRUint32 tmp = decimal;
while (tmp) {
num_bytes++;
tmp >>= 7;
}
if (!num_bytes)
++num_bytes; /* use one byte for a zero value */
if (num_bytes + result_bytes > sizeof result)
goto bad_data;
tmp = num_bytes;
rp = result + result_bytes - 1;
rp[tmp] = (PRUint8)(decimal & 0x7f);
decimal >>= 7;
while (--tmp > 0) {
rp[tmp] = (PRUint8)(decimal | 0x80);
decimal >>= 7;
}
result_bytes += num_bytes;
}
++decimal_numbers;
if (len > 0) { /* skip trailing '.' */
++from;
--len;
}
} while (len > 0);
/* now result contains result_bytes of data */
if (to->data && to->len >= result_bytes) {
PORT_Memcpy(to->data, result, to->len = result_bytes);
rv = SECSuccess;
} else {
SECItem result_item = { siBuffer, NULL, 0 };
result_item.data = result;
result_item.len = result_bytes;
rv = SECITEM_CopyItem(pool, to, &result_item);
}
return rv;
}
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