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encrypt_cng.c
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encrypt_cng.c
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/*
* UFTP - UDP based FTP with multicast
*
* Copyright (C) 2001-2015 Dennis A. Bush, Jr. [email protected]
*
* 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 3 of the License, or
* (at your option) any later version.
*
* 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.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
* Additional permission under GNU GPL version 3 section 7
*
* If you modify this program, or any covered work, by linking or
* combining it with the OpenSSL project's OpenSSL library (or a
* modified version of that library), containing parts covered by the
* terms of the OpenSSL or SSLeay licenses, the copyright holder
* grants you additional permission to convey the resulting work.
* Corresponding Source for a non-source form of such a combination
* shall include the source code for the parts of OpenSSL used as well
* as that of the covered work.
*/
//#include <stdio.h>
#include <stdlib.h>
#include <string.h>
// Use this #define to pull in necessary declarations from uftp_common.h
// in encryption.h instead. We don't include uftp_common.h because it contains
// an include for winsock2.h which is needed pretty much everyplace else.
// Including winsock2.h prevents BCryptEncrypt and BCryptDecrypt from working
// with GCM and CCM mode ciphers.
#define NO_UFTP_COMMON_H
#include "uftp.h"
#include "encryption.h"
#define MAXLIST 100
#define BLOBLEN 1000
static struct providers_t {
LPCWSTR alg;
LPCWSTR mode;
int hmac;
BCRYPT_ALG_HANDLE handle;
} providers[MAXLIST];
static int provlen;
static const struct keyinfo_t {
int keytype;
int keysize;
int blocksize;
} keyinfo[] = {
{ KEY_DES, 8, 8 },
{ KEY_DES_EDE3, 24, 8 },
{ KEY_AES128_CBC, 16, 16 },
{ KEY_AES128_GCM, 16, 12 },
{ KEY_AES128_CCM, 16, 12 },
{ KEY_AES256_CBC, 32, 16 },
{ KEY_AES256_GCM, 32, 12 },
{ KEY_AES256_CCM, 32, 12 }
};
static int machine_keyset = 0;
static int init_done = 0;
/**
* Prints Microsoft specific error messages to log
*/
static void mserror(const char *str, int err)
{
char errbuf[300];
HMODULE Hand = LoadLibrary("NTDLL.DLL");
FormatMessage(FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_FROM_HMODULE |
FORMAT_MESSAGE_IGNORE_INSERTS, Hand, err,
0, errbuf, sizeof(errbuf), NULL);
clog0(0, 0, 0, "%s: (0x%08X) %s", str, err, errbuf);
FreeLibrary(Hand);
}
/**
* Performs all necessary steps to initialize the crypto library
*/
void crypto_init(int set_sys_key)
{
provlen = 0;
if (set_sys_key) {
machine_keyset = NCRYPT_MACHINE_KEY_FLAG;
} else {
machine_keyset = 0;
}
init_done = 1;
}
/**
* Performs all necessary steps to clean up the crypto library
*/
void crypto_cleanup(void)
{
NTSTATUS status;
int i;
if (!init_done) {
return;
}
for (i = 0; i < provlen; i++) {
status = BCryptCloseAlgorithmProvider(providers[i].handle, 0);
if (!BCRYPT_SUCCESS(status)) {
mserror("BCryptCloseAlgorithmProvider failed", status);
}
}
}
/**
* Returns the next key for the current user
*/
const char *get_next_container(void)
{
static NCRYPT_PROV_HANDLE prov = 0;
static NCryptKeyName *keyitem = NULL;
static void *ptr = NULL;
static char name[256];
SECURITY_STATUS sstatus;
if (!prov) {
sstatus = NCryptOpenStorageProvider(&prov, NULL, 0);
if (!BCRYPT_SUCCESS(sstatus)) {
mserror("NCryptOpenStorageProvider failed", sstatus);
return NULL;
}
}
if (keyitem) {
NCryptFreeBuffer(keyitem);
}
sstatus = NCryptEnumKeys(prov, NULL, &keyitem, &ptr,
NCRYPT_SILENT_FLAG | machine_keyset);
if (sstatus == ERROR_SUCCESS) {
wcstombs(name, keyitem->pszName, sizeof(name));
return name;
} else {
if (sstatus != NTE_NO_MORE_ITEMS) {
mserror("NCryptEnumKeys failed", sstatus);
}
NCryptFreeBuffer(keyitem);
keyitem = NULL;
NCryptFreeBuffer(ptr);
ptr = NULL;
NCryptFreeObject(prov);
prov = 0;
return NULL;
}
}
/**
* Deletes the key container with the given name
*/
void delete_container(const char *container)
{
NCRYPT_PROV_HANDLE prov;
NCRYPT_KEY_HANDLE key;
SECURITY_STATUS sstatus;
wchar_t wcontainer[256];
if (!BCRYPT_SUCCESS(sstatus = NCryptOpenStorageProvider(&prov, NULL, 0))) {
mserror("NCryptOpenStorageProvider failed", sstatus);
}
memset(wcontainer, 0, sizeof(wcontainer));
mbstowcs(wcontainer, container, strlen(container));
sstatus = NCryptOpenKey(prov, &key, wcontainer, 0,
NCRYPT_SILENT_FLAG | machine_keyset);
if (!BCRYPT_SUCCESS(sstatus)) {
mserror("NCryptOpenKey failed", sstatus);
NCryptFreeObject(prov);
}
if (!BCRYPT_SUCCESS(sstatus = NCryptDeleteKey(key, NCRYPT_SILENT_FLAG))) {
NCryptFreeObject(prov);
mserror("NCryptDeleteKey failed", sstatus);
}
NCryptFreeObject(prov);
}
/**
* Gets an algorithm provider handle for the given hash or cipher.
* Check the provider list to see if it exists. If so, return it,
* otherwise get a new one and put it in the list.
*/
static BCRYPT_ALG_HANDLE get_alg_handle(LPCWSTR alg, LPCWSTR mode, int hmac)
{
BCRYPT_ALG_HANDLE handle;
NTSTATUS status;
int i;
for (i=0; i<provlen; i++) {
if ((providers[i].alg == alg) && (providers[i].mode == mode) &&
(providers[i].hmac == hmac)) {
return providers[i].handle;
}
}
status = BCryptOpenAlgorithmProvider(&handle, alg, NULL,
hmac ? BCRYPT_ALG_HANDLE_HMAC_FLAG : 0);
if (!BCRYPT_SUCCESS(status)) {
mserror("BCryptOpenAlgorithmProvider failed", status);
return NULL;
}
providers[provlen].alg = alg;
providers[provlen].mode = mode;
providers[provlen].hmac = hmac;
providers[provlen].handle = handle;
provlen++;
return handle;
}
/**
* Returns the cipher name associated with the given keytype
*/
static LPCWSTR get_cipher(int keytype)
{
switch (keytype) {
case KEY_DES:
return BCRYPT_DES_ALGORITHM;
case KEY_DES_EDE3:
return BCRYPT_3DES_ALGORITHM;
case KEY_AES128_CBC:
case KEY_AES256_CBC:
case KEY_AES128_GCM:
case KEY_AES256_GCM:
case KEY_AES128_CCM:
case KEY_AES256_CCM:
return BCRYPT_AES_ALGORITHM;
default:
log0(0, 0, 0, "Unknown keytype: %d", keytype);
return NULL;
}
}
/**
* Returns the cipher mode associated with the given keytype
*/
static LPCWSTR get_cipher_mode(int keytype)
{
switch (keytype) {
case KEY_DES:
case KEY_DES_EDE3:
case KEY_AES128_CBC:
case KEY_AES256_CBC:
return BCRYPT_CHAIN_MODE_CBC;
case KEY_AES128_GCM:
case KEY_AES256_GCM:
return BCRYPT_CHAIN_MODE_GCM;
case KEY_AES128_CCM:
case KEY_AES256_CCM:
return BCRYPT_CHAIN_MODE_CCM;
default:
return NULL;
}
}
/**
* Returns the hash name associated with a given hashtype
*/
static LPCWSTR get_hash(int hashtype)
{
switch (hashtype) {
case HASH_SHA512:
return BCRYPT_SHA512_ALGORITHM;
case HASH_SHA384:
return BCRYPT_SHA384_ALGORITHM;
case HASH_SHA256:
return BCRYPT_SHA256_ALGORITHM;
case HASH_SHA1:
return BCRYPT_SHA1_ALGORITHM;
case HASH_MD5:
return BCRYPT_MD5_ALGORITHM;
default:
log0(0, 0, 0, "Unknown hashtype: %d", hashtype);
return NULL;
}
}
static LPCWSTR get_curve_alg(int curve, int isdh)
{
if (isdh) {
switch (curve) {
case CURVE_prime256v1:
return BCRYPT_ECDH_P256_ALGORITHM;
case CURVE_secp384r1:
return BCRYPT_ECDH_P384_ALGORITHM;
case CURVE_secp521r1:
return BCRYPT_ECDH_P521_ALGORITHM;
default:
return NULL;
}
} else {
switch (curve) {
case CURVE_prime256v1:
return BCRYPT_ECDSA_P256_ALGORITHM;
case CURVE_secp384r1:
return BCRYPT_ECDSA_P384_ALGORITHM;
case CURVE_secp521r1:
return BCRYPT_ECDSA_P521_ALGORITHM;
default:
return NULL;
}
}
}
static ULONG get_curve_magic(int curve, int isdh)
{
if (isdh) {
switch (curve) {
case CURVE_prime256v1:
return BCRYPT_ECDH_PUBLIC_P256_MAGIC;
case CURVE_secp384r1:
return BCRYPT_ECDH_PUBLIC_P384_MAGIC;
case CURVE_secp521r1:
return BCRYPT_ECDH_PUBLIC_P521_MAGIC;
default:
return 0;
}
} else {
switch (curve) {
case CURVE_prime256v1:
return BCRYPT_ECDSA_PUBLIC_P256_MAGIC;
case CURVE_secp384r1:
return BCRYPT_ECDSA_PUBLIC_P384_MAGIC;
case CURVE_secp521r1:
return BCRYPT_ECDSA_PUBLIC_P521_MAGIC;
default:
return 0;
}
}
}
/**
* Returns whether a particular algorithm of a given type is available
*/
static int alg_found(LPCWSTR alg, int type)
{
NTSTATUS status;
BCRYPT_ALGORITHM_IDENTIFIER *balglist;
int count, found, i;
status = BCryptEnumAlgorithms(type, &count, &balglist, 0);
if (!BCRYPT_SUCCESS(status)) {
mserror("BCryptEnumAlgorithms failed", status);
return 0;
}
for (found = 0, i = 0; i < count; i++) {
if (!wcscmp(alg, balglist[i].pszName)) {
found = 1;
break;
}
}
BCryptFreeBuffer(balglist);
return found;
}
/**
* Returns whether a particular cipher is supported
*/
int cipher_supported(int keytype)
{
LPCWSTR alg;
if ((alg = get_cipher(keytype)) == NULL) {
return 0;
}
return alg_found(alg, BCRYPT_CIPHER_OPERATION);
}
/**
* Returns whether a particular hash is supported
*/
int hash_supported(int hashtype)
{
LPCWSTR alg;
if ((alg = get_hash(hashtype)) == NULL) {
return 0;
}
return alg_found(alg, BCRYPT_HASH_OPERATION);
}
/**
* Gets the key length and IV/block length of a given key
*/
void get_key_info(int keytype, int *keylen, int *ivlen)
{
int numkeys, i;
numkeys = sizeof(keyinfo) / sizeof(struct keyinfo_t);
for (i = 0; i < numkeys; i++) {
if (keytype == keyinfo[i].keytype) {
*keylen = keyinfo[i].keysize;
*ivlen = keyinfo[i].blocksize;
return;
}
}
*keylen = 0;
*ivlen = 0;
}
/**
* Gets the length of the given hash
*/
int get_hash_len(int hashtype)
{
BCRYPT_ALG_HANDLE alg;
NTSTATUS status;
DWORD hashlen, len;
alg = get_alg_handle(get_hash(hashtype), NULL, 0);
if (!alg) {
return 0;
}
status = BCryptGetProperty(alg, BCRYPT_HASH_LENGTH, (PUCHAR)&hashlen,
sizeof(DWORD), &len, 0);
if (!BCRYPT_SUCCESS(status)) {
mserror("BCryptGetProperty failed", status);
return 0;
}
return hashlen;
}
/**
* Gets num cryptographically random bytes
*/
int get_random_bytes(unsigned char *buf, int num)
{
BCRYPT_ALG_HANDLE alg;
NTSTATUS status;
alg = get_alg_handle(BCRYPT_RNG_ALGORITHM, NULL, 0);
if (!alg) {
return 0;
}
status = BCryptGenRandom(alg, buf, num, 0);
if (!BCRYPT_SUCCESS(status)) {
mserror("BCryptGenRandom failed", status);
return 0;
}
return 1;
}
/**
* Takes a block of data and encrypts it with a symmetric cypher.
* For authenticated cipher modes, also takes additional authentication data.
* The output buffer must be at least the size of source data + block size.
*/
int encrypt_block(int keytype, const unsigned char *IV,
const unsigned char *key,
const unsigned char *aad, unsigned int aadlen,
const unsigned char *src, unsigned int srclen,
unsigned char *dest, unsigned int *destlen)
{
BCRYPT_ALG_HANDLE alghandle = NULL;
BCRYPT_KEY_HANDLE keyhandle = NULL;
LPCWSTR alg, mode;
NTSTATUS status;
BCRYPT_AUTHENTICATED_CIPHER_MODE_INFO authinfo, *pauthinfo;
unsigned char *l_IV, *p_IV;
int keylen, ivlen, taglen, flags, l_ivlen;
alg = get_cipher(keytype);
get_key_info(keytype, &keylen, &ivlen);
mode = get_cipher_mode(keytype);
if ((alghandle = get_alg_handle(alg, mode, 0)) == NULL) {
log0(0, 0, 0, "get_alg_handle failed\n");
return 0;
}
status = BCryptSetProperty(alghandle, BCRYPT_CHAINING_MODE, (PUCHAR)mode,
sizeof(mode), 0);
if (!BCRYPT_SUCCESS(status)) {
mserror("BCryptSetProperty failed", status);
return 0;
}
status = BCryptGenerateSymmetricKey(alghandle, &keyhandle, NULL, 0,
(PUCHAR)key, keylen, 0);
if (!BCRYPT_SUCCESS(status)) {
mserror("BCryptGenerateSymmetricKey failed", status);
return 0;
}
l_IV = safe_calloc(ivlen, 1);
memcpy(l_IV, IV, ivlen);
taglen = is_gcm_mode(keytype) ? GCM_TAG_LEN :
is_ccm_mode(keytype) ? CCM_TAG_LEN : 0;
if (is_auth_enc(keytype)) {
BCRYPT_INIT_AUTH_MODE_INFO(authinfo);
authinfo.pbNonce = l_IV;
authinfo.cbNonce = ivlen;
authinfo.pbAuthData = (unsigned char *)aad;
authinfo.cbAuthData = aadlen;
authinfo.pbTag = dest + srclen;
authinfo.cbTag = taglen;
authinfo.pbMacContext = NULL;
authinfo.cbMacContext = 0;
authinfo.cbAAD = 0;
authinfo.cbData = 0;
authinfo.dwFlags = 0;
pauthinfo = &authinfo;
flags = 0;
p_IV = NULL;
l_ivlen = 0;
} else {
pauthinfo = NULL;
flags = BCRYPT_BLOCK_PADDING;
p_IV = l_IV;
l_ivlen = ivlen;
}
status = BCryptEncrypt(keyhandle, (PUCHAR)src, srclen, pauthinfo,
p_IV, l_ivlen, dest, srclen + GCM_TAG_LEN, destlen, flags);
if (!BCRYPT_SUCCESS(status)) {
mserror("BCryptEncrypt failed", status);
free(l_IV);
return 0;
}
free(l_IV);
*destlen += taglen;
if (!BCRYPT_SUCCESS(status = BCryptDestroyKey(keyhandle))) {
mserror("BCryptDestroyKey failed", status);
}
return 1;
}
/**
* Takes a block of data encrypted with a symmetric cypher and decrypts it.
* For authenticated cipher modes, also takes additional authentication data.
* The output buffer must be at least the size of source data.
*/
int decrypt_block(int keytype, const unsigned char *IV,
const unsigned char *key,
const unsigned char *aad, unsigned int aadlen,
unsigned char *src, unsigned int srclen,
unsigned char *dest, unsigned int *destlen)
{
BCRYPT_ALG_HANDLE alghandle = NULL;
BCRYPT_KEY_HANDLE keyhandle = NULL;
LPCWSTR alg, mode;
NTSTATUS status;
BCRYPT_AUTHENTICATED_CIPHER_MODE_INFO authinfo, *pauthinfo;
unsigned char *l_IV, *p_IV;
int keylen, ivlen, taglen, flags, l_ivlen;
alg = get_cipher(keytype);
get_key_info(keytype, &keylen, &ivlen);
mode = get_cipher_mode(keytype);
if ((alghandle = get_alg_handle(alg, mode, 0)) == NULL) {
log0(0, 0, 0, "get_alg_handle failed\n");
return 0;
}
status = BCryptSetProperty(alghandle, BCRYPT_CHAINING_MODE, (PUCHAR)mode,
sizeof(mode), 0);
if (!BCRYPT_SUCCESS(status)) {
mserror("BCryptSetProperty failed", status);
return 0;
}
status = BCryptGenerateSymmetricKey(alghandle, &keyhandle, NULL, 0,
(PUCHAR)key, keylen, 0);
if (!BCRYPT_SUCCESS(status)) {
mserror("BCryptGenerateSymmetricKey failed", status);
return 0;
}
l_IV = safe_calloc(ivlen, 1);
memcpy(l_IV, IV, ivlen);
taglen = is_gcm_mode(keytype) ? GCM_TAG_LEN :
is_ccm_mode(keytype) ? CCM_TAG_LEN : 0;
if (is_auth_enc(keytype)) {
BCRYPT_INIT_AUTH_MODE_INFO(authinfo);
authinfo.pbNonce = l_IV;
authinfo.cbNonce = ivlen;
authinfo.pbAuthData = (unsigned char *)aad;
authinfo.cbAuthData = aadlen;
authinfo.pbTag = (unsigned char *)src + srclen - taglen;
authinfo.cbTag = taglen;
authinfo.pbMacContext = NULL;
authinfo.cbMacContext = 0;
authinfo.cbAAD = 0;
authinfo.cbData = 0;
authinfo.dwFlags = 0;
pauthinfo = &authinfo;
flags = 0;
p_IV = NULL;
l_ivlen = 0;
} else {
pauthinfo = NULL;
flags = BCRYPT_BLOCK_PADDING;
p_IV = l_IV;
l_ivlen = ivlen;
}
status = BCryptDecrypt(keyhandle, (PUCHAR)src, srclen - taglen, pauthinfo,
p_IV, l_ivlen, dest, srclen + GCM_TAG_LEN, destlen, flags);
if (!BCRYPT_SUCCESS(status)) {
mserror("BCryptDecrypt failed", status);
free(l_IV);
return 0;
}
free(l_IV);
if (!BCRYPT_SUCCESS(status = BCryptDestroyKey(keyhandle))) {
mserror("BCryptDestroyKey failed", status);
}
return 1;
}
/**
* Calculates the HMAC of the given message, hashtype, and hashkey.
* dest must be at least the hash length.
*/
int create_hmac(int hashtype, const unsigned char *key, unsigned int keylen,
const unsigned char *src, unsigned int srclen,
unsigned char *dest, unsigned int *destlen)
{
BCRYPT_ALG_HANDLE alghandle = NULL;
BCRYPT_HASH_HANDLE hashhandle = NULL;
LPCWSTR alg;
NTSTATUS status;
DWORD _destlen, rlen;
alg = get_hash(hashtype);
if ((alghandle = get_alg_handle(alg, NULL, 1)) == NULL) {
log0(0, 0, 0, "get_alg_handle failed\n");
return 0;
}
status = BCryptGetProperty(alghandle, BCRYPT_HASH_LENGTH,
(char *)&_destlen, sizeof(destlen), &rlen, 0);
if (!BCRYPT_SUCCESS(status)) {
mserror("BCryptGetProperty failed", status);
return 0;
}
status = BCryptCreateHash(alghandle, &hashhandle, NULL, 0,
(char *)key, keylen, 0);
if (!BCRYPT_SUCCESS(status)) {
mserror("BCryptCreateHash failed", status);
return 0;
}
status = BCryptHashData(hashhandle, (PUCHAR)src, srclen, 0);
if (!BCRYPT_SUCCESS(status)) {
mserror("BCryptHashData failed", status);
return 0;
}
status = BCryptFinishHash(hashhandle, dest, _destlen, 0);
if (!BCRYPT_SUCCESS(status)) {
mserror("BCryptFinishHash failed", status);
return 0;
}
*destlen = _destlen;
if (!BCRYPT_SUCCESS(status = BCryptDestroyHash(hashhandle))) {
mserror("BCryptDestroyHash failed", status);
}
return 1;
}
/**
* Calculates the hash of the given message and hashtype
*/
int hash(int hashtype, const unsigned char *src, unsigned int srclen,
unsigned char *dest, unsigned int *destlen)
{
BCRYPT_ALG_HANDLE alghandle = NULL;
BCRYPT_HASH_HANDLE hashhandle = NULL;
LPCWSTR alg;
NTSTATUS status;
DWORD _destlen, rlen;
alg = get_hash(hashtype);
if ((alghandle = get_alg_handle(alg, NULL, 0)) == NULL) {
log0(0, 0, 0, "get_alg_handle failed\n");
return 0;
}
status = BCryptGetProperty(alghandle, BCRYPT_HASH_LENGTH,
(char *)&_destlen, sizeof(destlen), &rlen, 0);
if (!BCRYPT_SUCCESS(status)) {
mserror("BCryptGetProperty failed", status);
return 0;
}
status = BCryptCreateHash(alghandle, &hashhandle, NULL, 0, NULL, 0, 0);
if (!BCRYPT_SUCCESS(status)) {
mserror("BCryptCreateHash failed", status);
return 0;
}
status = BCryptHashData(hashhandle, (PUCHAR)src, srclen, 0);
if (!BCRYPT_SUCCESS(status)) {
mserror("BCryptHashData failed", status);
return 0;
}
status = BCryptFinishHash(hashhandle, dest, _destlen, 0);
if (!BCRYPT_SUCCESS(status)) {
mserror("BCryptFinishHash failed", status);
return 0;
}
*destlen = _destlen;
if (!BCRYPT_SUCCESS(status = BCryptDestroyHash(hashhandle))) {
mserror("BCryptDestroyHash failed", status);
}
return 1;
}
/**
* Returns the length in bytes of the modulus for the given RSA key
*/
int RSA_keylen(const RSA_key_t rsa)
{
int bits, len;
SECURITY_STATUS sstatus;
sstatus = NCryptGetProperty(rsa, NCRYPT_LENGTH_PROPERTY, (PBYTE)&bits,
sizeof(bits), &len, NCRYPT_SILENT_FLAG);
if (!BCRYPT_SUCCESS(sstatus)) {
mserror("NCryptGetProperty failed", sstatus);
return 0;
}
return bits / 8;
}
/**
* Returns the length of an exported EC public key
* An exported key is built as follows:
* uint8_t xpoint[ceil(curve_bitlen/8)]
* uint8_t ypoint[ceil(curve_bitlen/8)]
* uint8_t padding[]
*/
int EC_keylen(const EC_key_t ec)
{
SECURITY_STATUS sstatus;
int len, padding;
sstatus = NCryptExportKey(ec, (NCRYPT_KEY_HANDLE)NULL,
BCRYPT_ECCPUBLIC_BLOB, NULL, NULL, 0, &len, NCRYPT_SILENT_FLAG);
if (!BCRYPT_SUCCESS(sstatus)) {
mserror("NCryptExportKey failed", sstatus);
return 0;
}
len -= sizeof(BCRYPT_ECCKEY_BLOB);
if ((len % 4) == 0) {
padding = 0;
} else {
padding = 4 - (len % 4);
}
return len + padding;
}
/**
* Returns the length in bytes of a signature created by the given ECDSA key
* ECDSA signatures consist of:
* uint16_t rlen
* uint16_t slen
* uint8_t rsig[ceil(curve_bitlen/8)]
* uint8_t ssig[ceil(curve_bitlen/8)]
* uint8_t padding[]
*/
int ECDSA_siglen(const EC_key_t ec)
{
return sizeof(uint16_t) + sizeof(uint16_t) + EC_keylen(ec);
}
/**
* Encrypts a small block of data with an RSA public key.
* Output buffer must be at least the key size.
*/
int RSA_encrypt(RSA_key_t rsa, const unsigned char *from, unsigned int fromlen,
unsigned char *to, unsigned int *tolen)
{
SECURITY_STATUS sstatus;
BCRYPT_OAEP_PADDING_INFO pad, *ppad;
int keylen, _tolen, flags;
keylen = RSA_keylen(rsa);
if (keylen * 8 < 768) {
flags = NCRYPT_PAD_PKCS1_FLAG;
ppad = NULL;
} else {
flags = NCRYPT_PAD_OAEP_FLAG;
ppad = &pad;
pad.pszAlgId = BCRYPT_SHA1_ALGORITHM;
pad.pbLabel = NULL;
pad.cbLabel = 0;
}
_tolen = keylen * ((fromlen / keylen) + 1);
sstatus = NCryptEncrypt(rsa, (PUCHAR)from, fromlen, ppad, to, _tolen,
&_tolen, flags);
if (!BCRYPT_SUCCESS(sstatus)) {
mserror("NCryptEncrypt failed", sstatus);
return 0;
}
*tolen = _tolen;
return 1;
}
/**
* Decrypts a small block of data with an RSA private key.
*/
int RSA_decrypt(RSA_key_t rsa, const unsigned char *from, unsigned int fromlen,
unsigned char *to, unsigned int *tolen)
{
SECURITY_STATUS sstatus;
BCRYPT_OAEP_PADDING_INFO pad, *ppad;
int _tolen, flags;
if (RSA_keylen(rsa) * 8 < 768) {
flags = NCRYPT_PAD_PKCS1_FLAG;
ppad = NULL;
} else {
flags = NCRYPT_PAD_OAEP_FLAG;
ppad = &pad;
pad.pszAlgId = BCRYPT_SHA1_ALGORITHM;
pad.pbLabel = NULL;
pad.cbLabel = 0;
}
_tolen = fromlen;
sstatus = NCryptDecrypt(rsa, (PUCHAR)from, fromlen, ppad, to, _tolen,
&_tolen, flags);
if (!BCRYPT_SUCCESS(sstatus)) {
mserror("NCryptDecrypt failed", sstatus);
return 0;
}
*tolen = _tolen;
return 1;
}
/**
* Hashes a block of data and signs it with an RSA private key.
* Output buffer must be at least the key size.
*/
int create_RSA_sig(RSA_key_t rsa, int hashtype,
const unsigned char *mes, unsigned int meslen,
unsigned char *sig, unsigned int *siglen)
{
SECURITY_STATUS sstatus;
unsigned char meshash[HMAC_LEN];
unsigned int meshashlen, _siglen;
BCRYPT_PKCS1_PADDING_INFO padding;
if (!hash(hashtype, mes, meslen, meshash, &meshashlen)) {
return 0;
}
padding.pszAlgId = get_hash(hashtype);
_siglen = RSA_keylen(rsa);
sstatus = NCryptSignHash(rsa, &padding, meshash, meshashlen, sig, _siglen,
&_siglen, BCRYPT_PAD_PKCS1);
if (!BCRYPT_SUCCESS(sstatus)) {
mserror("NCryptSignHash failed", sstatus);
return 0;
}
*siglen = _siglen;
return 1;
}
/**
* Hashes a block of data and verifies it against an RSA signature.
*/
int verify_RSA_sig(RSA_key_t rsa, int hashtype,
const unsigned char *mes, unsigned int meslen,
unsigned char *sig, unsigned int siglen)
{
SECURITY_STATUS sstatus;
unsigned char meshash[HMAC_LEN];
unsigned int meshashlen;
BCRYPT_PKCS1_PADDING_INFO padding;
if (!hash(hashtype, mes, meslen, meshash, &meshashlen)) {
return 0;
}
padding.pszAlgId = get_hash(hashtype);
sstatus = NCryptVerifySignature(rsa, &padding, meshash, meshashlen, sig,
siglen, BCRYPT_PAD_PKCS1);
if (!BCRYPT_SUCCESS(sstatus)) {
mserror("NCryptVerifySignature failed", sstatus);
return 0;
}
return 1;
}
/**
* Hashes a block of data and signs it with an ECDSA private key.
* Output buffer must be at least ECDSA_siglen bytes.
*/
int create_ECDSA_sig(EC_key_t ec, int hashtype,
const unsigned char *mes, unsigned int meslen,
unsigned char *sig, unsigned int *siglen)
{
SECURITY_STATUS sstatus;
unsigned char meshash[HMAC_LEN], *buf;
unsigned int meshashlen, _siglen;
uint16_t *rlen, *slen;
unsigned char *rsval;
if (!hash(hashtype, mes, meslen, meshash, &meshashlen)) {
return 0;
}
sstatus = NCryptSignHash(ec, NULL, meshash, meshashlen, NULL, 0,
&_siglen, 0);
if (!BCRYPT_SUCCESS(sstatus)) {
mserror("NCryptSignHash failed", sstatus);
return 0;
}
buf = safe_malloc(_siglen);
sstatus = NCryptSignHash(ec, NULL, meshash, meshashlen, buf, _siglen,
&_siglen, 0);
if (!BCRYPT_SUCCESS(sstatus)) {
mserror("NCryptSignHash failed", sstatus);
free(buf);
return 0;
}
rlen = (uint16_t *)sig;
slen = (uint16_t *)(sig + sizeof(uint16_t));
rsval = (unsigned char *)slen + sizeof(uint16_t);
*siglen = ECDSA_siglen(ec);
memset(sig, 0, *siglen);
*rlen = htons((uint16_t)_siglen / 2);
*slen = htons((uint16_t)_siglen / 2);
memcpy(rsval, buf, _siglen);
free(buf);
return 1;
}
/**
* Hashes a block of data and verifies it against an ECDSA signature.
*/
int verify_ECDSA_sig(EC_key_t ec, int hashtype,
const unsigned char *mes, unsigned int meslen,
const unsigned char *sig, unsigned int siglen)
{
SECURITY_STATUS sstatus;
unsigned char meshash[HMAC_LEN];
unsigned int meshashlen;
uint16_t *rlen, *slen;
unsigned char *rsval;
if (!hash(hashtype, mes, meslen, meshash, &meshashlen)) {
return 0;
}
rlen = (uint16_t *)sig;
slen = (uint16_t *)(sig + sizeof(uint16_t));
rsval = (unsigned char *)slen + sizeof(uint16_t);
if ((unsigned int)ntohs(*rlen) + ntohs(*slen) > siglen) {
log0(0, 0, 0, "Invalid signature length");
return 0;
}
sstatus = NCryptVerifySignature(ec, NULL, meshash, meshashlen, rsval,
ntohs(*rlen) + ntohs(*slen), 0);
if (!BCRYPT_SUCCESS(sstatus)) {
mserror("NCryptVerifySignature failed", sstatus);
return 0;
}
return 1;
}
/**
* Creates an ECDH key based on two EC keys, one public and one private
*/
int get_ECDH_key(EC_key_t pubkey, EC_key_t privkey, unsigned char *key,
unsigned int *keylen)
{
SECURITY_STATUS sstatus;
NCRYPT_SECRET_HANDLE secret;
int _len;
sstatus = NCryptSecretAgreement(privkey, pubkey, &secret, 0);
if (!BCRYPT_SUCCESS(sstatus)) {
mserror("NCryptSecretAgreement failed", sstatus);
return 0;
}
sstatus = NCryptDeriveKey(secret, BCRYPT_KDF_HASH, NULL, NULL, 0, &_len, 0);
if (!BCRYPT_SUCCESS(sstatus)) {
mserror("NCryptDeriveKey failed", sstatus);
return 0;
}
sstatus = NCryptDeriveKey(secret, BCRYPT_KDF_HASH, NULL, key, _len,
keylen, 0 );
if (!BCRYPT_SUCCESS(sstatus)) {
mserror("NCryptDeriveKey failed", sstatus);
return 0;
}
return 1;
}