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encoding.c
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encoding.c
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/*
* Base64 encoding/decoding (RFC1341)
* Copyright (c) 2005-2019, Jouni Malinen <j@w1.fi>
*
*
* This software may be distributed, used, and modified under the terms of
* BSD license:
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* 3. Neither the name(s) of the above-listed copyright holder(s) nor the
* names of its contributors may be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <stddef.h>
#include <stdlib.h>
#include <string.h>
#include <limits.h>
#include "json.h"
#include "malloc.h"
#include "value.h"
static const unsigned char base64_table[65] =
"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
static const unsigned char base64_url_table[65] =
"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789-_";
static unsigned char * base64_gen_encode(const unsigned char *src, size_t len,
size_t *out_len,
const unsigned char *table,
int add_pad)
{
unsigned char *out, *pos;
const unsigned char *end, *in;
size_t olen;
if (len >= SIZE_MAX / 4)
return NULL;
olen = len * 4 / 3 + 4; /* 3-byte blocks to 4-byte */
olen++; /* nul termination */
if (olen < len)
return NULL; /* integer overflow */
out = malloc(olen);
if (out == NULL)
return NULL;
end = src + len;
in = src;
pos = out;
while (end - in >= 3) {
*pos++ = table[(in[0] >> 2) & 0x3f];
*pos++ = table[(((in[0] & 0x03) << 4) | (in[1] >> 4)) & 0x3f];
*pos++ = table[(((in[1] & 0x0f) << 2) | (in[2] >> 6)) & 0x3f];
*pos++ = table[in[2] & 0x3f];
in += 3;
}
if (end - in) {
*pos++ = table[(in[0] >> 2) & 0x3f];
if (end - in == 1) {
*pos++ = table[((in[0] & 0x03) << 4) & 0x3f];
if (add_pad)
*pos++ = '=';
} else {
*pos++ = table[(((in[0] & 0x03) << 4) |
(in[1] >> 4)) & 0x3f];
*pos++ = table[((in[1] & 0x0f) << 2) & 0x3f];
}
if (add_pad)
*pos++ = '=';
}
*pos = '\0';
if (out_len)
*out_len = pos - out;
return out;
}
static unsigned char * base64_gen_decode(const unsigned char *src, size_t len,
size_t *out_len,
const unsigned char *table)
{
unsigned char dtable[256], *out, *pos, block[4], tmp;
size_t i, count, olen;
int pad = 0;
size_t extra_pad;
memset(dtable, 0x80, 256);
for (i = 0; i < sizeof(base64_table) - 1; i++)
dtable[table[i]] = (unsigned char) i;
dtable['='] = 0;
count = 0;
for (i = 0; i < len; i++) {
if (dtable[src[i]] != 0x80)
count++;
}
if (count == 0)
return NULL;
extra_pad = (4 - count % 4) % 4;
olen = (count + extra_pad) / 4 * 3;
pos = out = malloc(olen);
if (out == NULL)
return NULL;
count = 0;
for (i = 0; i < len + extra_pad; i++) {
unsigned char val;
if (i >= len)
val = '=';
else
val = src[i];
tmp = dtable[val];
if (tmp == 0x80)
continue;
if (val == '=')
pad++;
block[count] = tmp;
count++;
if (count == 4) {
*pos++ = (block[0] << 2) | (block[1] >> 4);
*pos++ = (block[1] << 4) | (block[2] >> 2);
*pos++ = (block[2] << 6) | block[3];
count = 0;
if (pad) {
if (pad == 1)
pos--;
else if (pad == 2)
pos -= 2;
else {
/* Invalid padding */
free(out);
return NULL;
}
break;
}
}
}
*out_len = pos - out;
return out;
}
/**
* base64_encode - Base64 encode
* @src: Data to be encoded
* @len: Length of the data to be encoded
* @out_len: Pointer to output length variable, or %NULL if not used
* Returns: Allocated buffer of out_len bytes of encoded data,
* or %NULL on failure
*
* Caller is responsible for freeing the returned buffer. Returned buffer is
* nul terminated to make it easier to use as a C string. The nul terminator is
* not included in out_len.
*/
static unsigned char * base64_encode(const unsigned char *src, size_t len,
size_t *out_len)
{
return base64_gen_encode(src, len, out_len, base64_table, 1);
}
static unsigned char * base64_url_encode(const unsigned char *src, size_t len,
size_t *out_len, int add_pad)
{
return base64_gen_encode(src, len, out_len, base64_url_table, add_pad);
}
/**
* base64_decode - Base64 decode
* @src: Data to be decoded
* @len: Length of the data to be decoded
* @out_len: Pointer to output length variable
* Returns: Allocated buffer of out_len bytes of decoded data,
* or %NULL on failure
*
* Caller is responsible for freeing the returned buffer.
*/
static unsigned char * base64_decode(const unsigned char *src, size_t len,
size_t *out_len)
{
return base64_gen_decode(src, len, out_len, base64_table);
}
static unsigned char * base64_url_decode(const unsigned char *src, size_t len,
size_t *out_len)
{
return base64_gen_decode(src, len, out_len, base64_url_table);
}
OPA_BUILTIN
opa_value *opa_base64_is_valid(opa_value *a)
{
if (opa_value_type(a) != OPA_STRING)
{
return opa_boolean(false);
}
opa_string_t *s = opa_cast_string(a);
size_t len;
unsigned char *dec = base64_decode((const unsigned char*)s->v, s->len, &len);
if (dec == NULL)
{
return opa_boolean(false);
}
free(dec);
return opa_boolean(true);
}
OPA_BUILTIN
opa_value *opa_base64_decode(opa_value *a)
{
if (opa_value_type(a) != OPA_STRING)
{
return NULL;
}
opa_string_t *s = opa_cast_string(a);
size_t len;
char *dec = (char *)base64_decode((const unsigned char*)s->v, s->len, &len);
return dec == NULL ? NULL : opa_string_allocated(dec, len);
}
OPA_BUILTIN
opa_value *opa_base64_encode(opa_value *a)
{
if (opa_value_type(a) != OPA_STRING)
{
return NULL;
}
opa_string_t *s = opa_cast_string(a);
size_t len;
char *enc = (char *)base64_encode((const unsigned char*)s->v, s->len, &len);
return enc == NULL ? NULL : opa_string_allocated(enc, len);
}
OPA_BUILTIN
opa_value *opa_base64_url_decode(opa_value *a)
{
if (opa_value_type(a) != OPA_STRING)
{
return NULL;
}
opa_string_t *s = opa_cast_string(a);
size_t len;
char *dec = (char *)base64_url_decode((const unsigned char*)s->v, s->len, &len);
return dec == NULL ? NULL : opa_string_allocated(dec, len);
}
OPA_BUILTIN
opa_value *opa_base64_url_encode(opa_value *a)
{
if (opa_value_type(a) != OPA_STRING)
{
return NULL;
}
opa_string_t *s = opa_cast_string(a);
size_t len;
char *enc = (char *)base64_url_encode((const unsigned char*)s->v, s->len, &len, 1);
return enc == NULL ? NULL : opa_string_allocated(enc, len);
}
OPA_BUILTIN
opa_value *opa_json_unmarshal(opa_value *a)
{
if (opa_value_type(a) != OPA_STRING)
{
return NULL;
}
opa_string_t *s = opa_cast_string(a);
return opa_json_parse(s->v, s->len);
}
OPA_BUILTIN
opa_value *opa_json_marshal(opa_value *a)
{
const char *v = opa_json_dump(a);
if (v == NULL)
{
return NULL;
}
return opa_string_allocated(v, strlen(v));
}
OPA_BUILTIN
opa_value *opa_json_is_valid(opa_value *a)
{
if (opa_value_type(a) != OPA_STRING)
{
return opa_boolean(false);
}
opa_string_t *s = opa_cast_string(a);
opa_value *r = opa_json_parse(s->v, s->len);
if (r == NULL)
{
return opa_boolean(false);
}
opa_free(r);
return opa_boolean(true);
}