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/*
* Copyright (C) 2014-2015,2017 Andrew Cagney <cagney@gnu.org>
*
* This program 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. See <https://www.gnu.org/licenses/gpl2.txt>.
*
* This program 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.
*/
#include <stdlib.h>
#include "constants.h"
#include "lswalloc.h"
#include "pk11pub.h"
#include "crypt_symkey.h"
#include "crypt_mac.h"
#include "test_buffer.h"
#include "ike_alg.h"
#include "lswlog.h"
/*
* Given an ASCII string, convert it into a chunk of bytes. If the
* string is prefixed by 0x assume the contents are hex (with spaces)
* and decode it; otherwise it is assumed that the ASCII (minus the
* NUL) should be copied.
*
* The caller must free the chunk.
*/
chunk_t decode_to_chunk(const char *prefix, const char *original,
struct logger *logger, where_t where UNUSED)
{
if (LDBGP(DBG_CRYPT, logger)) {
LDBG_log(logger, "%s() %s: input \"%s\"",
__func__, prefix, original);
}
chunk_t chunk;
if (startswith(original, "0x")) {
chunk = chunk_from_hex(original + strlen("0x"), original);
} else {
chunk = alloc_chunk(strlen(original), original);
memcpy(chunk.ptr, original, chunk.len);
}
if (LDBGP(DBG_CRYPT, logger)) {
LDBG_log(logger, "%s() output:", __func__);
LDBG_hunk(logger, chunk);
}
return chunk;
}
/*
* Given an ASCII string, convert it into a chunk of bytes. If the
* string is prefixed by 0x assume the contents are hex (with spaces)
* and decode it; otherwise it is assumed that the ASCII (minus the
* NUL) should be copied.
*
* The caller must free the chunk.
*/
struct crypt_mac decode_to_mac(const char *prefix, const char *original,
struct logger *logger, where_t where UNUSED)
{
if (LDBGP(DBG_CRYPT, logger)) {
LDBG_log(logger, "%s() %s: input \"%s\"",
__func__, prefix, original);
}
struct crypt_mac mac;
if (startswith(original, "0x")) {
chunk_t chunk = chunk_from_hex(original + strlen("0x"), original);
PASSERT(logger, chunk.len <= sizeof(mac.ptr/*array*/));
mac.len = chunk.len;
memcpy(mac.ptr, chunk.ptr, mac.len);
free_chunk_content(&chunk);
} else {
mac.len = strlen(original);
PASSERT(logger, mac.len <= sizeof(mac.ptr/*array*/));
memcpy(mac.ptr, original, mac.len);
}
if (LDBGP(DBG_CRYPT, logger)) {
LDBG_log(logger, "%s() output:", __func__);
LDBG_hunk(logger, mac);
}
return mac;
}
PK11SymKey *decode_hex_to_symkey(const char *prefix, const char *string,
struct logger *logger, where_t where UNUSED)
{
chunk_t chunk = chunk_from_hex(string, prefix);
PK11SymKey *symkey = symkey_from_hunk(prefix, chunk, logger);
free_chunk_content(&chunk);
return symkey;
}
/*
* Verify that the chunk's data is the same as actual.
*/
bool verify_bytes(const char *desc, const char *verifying,
const void *expected, size_t expected_size,
const void *actual, size_t actual_size,
struct logger *logger, where_t where)
{
if (expected_size != actual_size) {
llog_pexpect(logger, where,
"%s: %s: expected length %zd but got %zd",
desc, verifying, expected_size, actual_size);
return false;
}
size_t i;
for (i = 0; i < expected_size; i++) {
uint8_t e = ((const uint8_t*)expected)[i];
uint8_t a = ((const uint8_t*)actual)[i];
if (e != a) {
/* Caller should issue the real log message. */
llog_pexpect(logger, where,
"%s: %s: bytes at %zd differ, expected %02x found %02x",
desc, verifying, i, e, a);
return false;
}
}
if (LDBGP(DBG_CRYPT, logger)) {
LDBG_log(logger, "%s() %s: %s: ok", __func__, desc, verifying);
}
return true;
}
/* verify that expected is the same as actual */
bool verify_symkey(const char *desc, const char *verifying,
chunk_t expected, PK11SymKey *actual,
struct logger *logger, where_t where)
{
if (expected.len != sizeof_symkey(actual)) {
llog_pexpect(logger, where, "%s: %s: expected length %zd but got %zd",
desc, verifying, expected.len, sizeof_symkey(actual));
return false;
}
chunk_t chunk = chunk_from_symkey(desc, actual, logger);
bool ok = verify_hunk(desc, verifying, expected, chunk, logger, where);
free_chunk_content(&chunk);
return ok;
}
/*
* Turn the raw key into SymKey.
*/
PK11SymKey *decode_to_key(const struct encrypt_desc *encrypt_desc,
const char *encoded_key,
struct logger *logger, where_t where)
{
chunk_t raw_key = decode_to_chunk("raw_key", encoded_key, logger, where);
PK11SymKey *symkey = encrypt_key_from_hunk("symkey", encrypt_desc, raw_key, logger);
free_chunk_content(&raw_key);
return symkey;
}
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