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openGauss-server/contrib/pgcrypto/pgp-armor.cpp

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/*
* pgp-armor.c
* PGP ascii-armor.
*
* Copyright (c) 2005 Marko Kreen
* All rights reserved.
*
* 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.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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.
*
* contrib/pgcrypto/pgp-armor.c
*/
#include "postgres.h"
#include "knl/knl_variable.h"
#include "px.h"
#include "mbuf.h"
#include "pgp.h"
/*
* BASE64 - duplicated :(
*/
static const unsigned char _base64[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
static int b64_encode(const uint8* src, unsigned len, uint8* dst)
{
uint8 *p, *lend = dst + 76;
const uint8 *s, *end = src + len;
int pos = 2;
unsigned long buf = 0;
s = src;
p = dst;
while (s < end) {
buf |= *s << (pos << 3);
pos--;
s++;
/*
* write it out
*/
if (pos < 0) {
*p++ = _base64[(buf >> 18) & 0x3f];
*p++ = _base64[(buf >> 12) & 0x3f];
*p++ = _base64[(buf >> 6) & 0x3f];
*p++ = _base64[buf & 0x3f];
pos = 2;
buf = 0;
}
if (p >= lend) {
*p++ = '\n';
lend = p + 76;
}
}
if (pos != 2) {
*p++ = _base64[(buf >> 18) & 0x3f];
*p++ = _base64[(buf >> 12) & 0x3f];
*p++ = (pos == 0) ? _base64[(buf >> 6) & 0x3f] : '=';
*p++ = '=';
}
return p - dst;
}
/* probably should use lookup table */
static int b64_decode(const uint8* src, unsigned len, uint8* dst)
{
const uint8 *srcend = src + len, *s = src;
uint8* p = dst;
char c;
unsigned b = 0;
unsigned long buf = 0;
int pos = 0, end = 0;
while (s < srcend) {
c = *s++;
if (c >= 'A' && c <= 'Z')
b = c - 'A';
else if (c >= 'a' && c <= 'z')
b = c - 'a' + 26;
else if (c >= '0' && c <= '9')
b = c - '0' + 52;
else if (c == '+')
b = 62;
else if (c == '/')
b = 63;
else if (c == '=') {
/*
* end sequence
*/
if (!end) {
if (pos == 2)
end = 1;
else if (pos == 3)
end = 2;
else
return PXE_PGP_CORRUPT_ARMOR;
}
b = 0;
} else if (c == ' ' || c == '\t' || c == '\n' || c == '\r')
continue;
else
return PXE_PGP_CORRUPT_ARMOR;
/*
* add it to buffer
*/
buf = (buf << 6) + b;
pos++;
if (pos == 4) {
*p++ = (buf >> 16) & 255;
if (end == 0 || end > 1)
*p++ = (buf >> 8) & 255;
if (end == 0 || end > 2)
*p++ = buf & 255;
buf = 0;
pos = 0;
}
}
if (pos != 0)
return PXE_PGP_CORRUPT_ARMOR;
return p - dst;
}
static unsigned b64_enc_len(unsigned srclen)
{
/*
* 3 bytes will be converted to 4, linefeed after 76 chars
*/
return (srclen + 2) * 4 / 3 + srclen / (76 * 3 / 4);
}
static unsigned b64_dec_len(unsigned srclen)
{
return (srclen * 3) >> 2;
}
/*
* PGP armor
*/
static const char* armor_header = "-----BEGIN PGP MESSAGE-----\n\n";
static const char* armor_footer = "\n-----END PGP MESSAGE-----\n";
/* CRC24 implementation from rfc2440 */
#define CRC24_INIT 0x00b704ceL
#define CRC24_POLY 0x01864cfbL
static long crc24(const uint8* data, unsigned len)
{
unsigned crc = CRC24_INIT;
int i;
while (len--) {
crc ^= (*data++) << 16;
for (i = 0; i < 8; i++) {
crc <<= 1;
if (crc & 0x1000000)
crc ^= CRC24_POLY;
}
}
return crc & 0xffffffL;
}
int pgp_armor_encode(const uint8* src, unsigned len, uint8* dst)
{
int n;
uint8* pos = dst;
unsigned crc = crc24(src, len);
n = strlen(armor_header);
memcpy(pos, armor_header, n);
pos += n;
n = b64_encode(src, len, pos);
pos += n;
if (*(pos - 1) != '\n')
*pos++ = '\n';
*pos++ = '=';
pos[3] = _base64[crc & 0x3f];
crc >>= 6;
pos[2] = _base64[crc & 0x3f];
crc >>= 6;
pos[1] = _base64[crc & 0x3f];
crc >>= 6;
pos[0] = _base64[crc & 0x3f];
pos += 4;
n = strlen(armor_footer);
memcpy(pos, armor_footer, n);
pos += n;
return pos - dst;
}
static const uint8* find_str(const uint8* data, const uint8* data_end, const char* str, int strlen)
{
const uint8* p = data;
if (!strlen)
return NULL;
if (data_end - data < strlen)
return NULL;
while (p < data_end) {
p = (const uint8*)memchr(p, str[0], data_end - p);
if (p == NULL)
return NULL;
if (p + strlen > data_end)
return NULL;
if (memcmp(p, str, strlen) == 0)
return p;
p++;
}
return NULL;
}
static int find_header(const uint8* data, const uint8* datend, const uint8** start_p, int is_end)
{
const uint8* p = data;
static const char* start_sep = "-----BEGIN";
static const char* end_sep = "-----END";
const char* sep = is_end ? end_sep : start_sep;
/* find header line */
while (1) {
p = find_str(p, datend, sep, strlen(sep));
if (p == NULL)
return PXE_PGP_CORRUPT_ARMOR;
/* it must start at beginning of line */
if (p == data || *(p - 1) == '\n')
break;
p += strlen(sep);
}
*start_p = p;
p += strlen(sep);
/* check if header text ok */
for (; p < datend && *p != '-'; p++) {
/* various junk can be there, but definitely not line-feed */
if (*p >= ' ')
continue;
return PXE_PGP_CORRUPT_ARMOR;
}
if (datend - p < 5 || memcmp(p, sep, 5) != 0)
return PXE_PGP_CORRUPT_ARMOR;
p += 5;
/* check if at end of line */
if (p < datend) {
if (*p != '\n' && *p != '\r')
return PXE_PGP_CORRUPT_ARMOR;
if (*p == '\r')
p++;
if (p < datend && *p == '\n')
p++;
}
return p - *start_p;
}
int pgp_armor_decode(const uint8* src, unsigned len, uint8* dst)
{
const uint8* p = src;
const uint8* data_end = src + len;
long crc;
const uint8 *base64_start, *armor_end;
const uint8* base64_end = NULL;
uint8 buf[4];
int hlen;
int res = PXE_PGP_CORRUPT_ARMOR;
/* armor start */
hlen = find_header(src, data_end, &p, 0);
if (hlen <= 0)
goto out;
p += hlen;
/* armor end */
hlen = find_header(p, data_end, &armor_end, 1);
if (hlen <= 0)
goto out;
/* skip comments - find empty line */
while (p < armor_end && *p != '\n' && *p != '\r') {
p = (const uint8*)memchr(p, '\n', armor_end - p);
if (!p)
goto out;
/* step to start of next line */
p++;
}
base64_start = p;
/* find crc pos */
for (p = armor_end; p >= base64_start; p--)
if (*p == '=') {
base64_end = p - 1;
break;
}
if (base64_end == NULL)
goto out;
/* decode crc */
if (b64_decode(p + 1, 4, buf) != 3)
goto out;
crc = (((long)buf[0]) << 16) + (((long)buf[1]) << 8) + (long)buf[2];
/* decode data */
res = b64_decode(base64_start, base64_end - base64_start, dst);
/* check crc */
if (res >= 0 && crc24(dst, res) != crc)
res = PXE_PGP_CORRUPT_ARMOR;
out:
return res;
}
unsigned pgp_armor_enc_len(unsigned len)
{
return b64_enc_len(len) + strlen(armor_header) + strlen(armor_footer) + 16;
}
unsigned pgp_armor_dec_len(unsigned len)
{
return b64_dec_len(len);
}
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