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wincng.c
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wincng.c
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/*
* Copyright (C) Marc Hoersken <info@marc-hoersken.de>
* All rights reserved.
*
* Redistribution and use in source and binary forms,
* with or without modification, are permitted provided
* that the following conditions are met:
*
* Redistributions of source code must retain the above
* copyright notice, this list of conditions and the
* following disclaimer.
*
* 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.
*
* Neither the name of the copyright holder nor the names
* of any other 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.
*
* SPDX-License-Identifier: BSD-3-Clause
*/
#ifdef LIBSSH2_CRYPTO_C /* Compile this via crypto.c */
/* required for cross-compilation against the w64 mingw-runtime package */
#if defined(_WIN32_WINNT) && (_WIN32_WINNT < 0x0600)
#undef _WIN32_WINNT
#endif
#ifndef _WIN32_WINNT
#define _WIN32_WINNT 0x0600
#endif
#if !defined(LIBSSH2_WINCNG_DISABLE_WINCRYPT) && !defined(HAVE_LIBCRYPT32)
#define HAVE_LIBCRYPT32
#endif
/* specify the required libraries for dependencies using MSVC */
#ifdef _MSC_VER
#pragma comment(lib, "bcrypt.lib")
#ifdef HAVE_LIBCRYPT32
#pragma comment(lib, "crypt32.lib")
#endif
#endif
#include <windows.h>
#include <bcrypt.h>
#include <math.h>
#include <stdlib.h>
#ifdef HAVE_LIBCRYPT32
#include <wincrypt.h> /* for CryptDecodeObjectEx() */
#endif
#define PEM_RSA_HEADER "-----BEGIN RSA PRIVATE KEY-----"
#define PEM_RSA_FOOTER "-----END RSA PRIVATE KEY-----"
#define PEM_DSA_HEADER "-----BEGIN DSA PRIVATE KEY-----"
#define PEM_DSA_FOOTER "-----END DSA PRIVATE KEY-----"
#define PEM_ECDSA_HEADER "-----BEGIN OPENSSH PRIVATE KEY-----"
#define PEM_ECDSA_FOOTER "-----END OPENSSH PRIVATE KEY-----"
#define OPENSSL_PRIVATEKEY_AUTH_MAGIC "openssh-key-v1"
/* Define these manually to avoid including <ntstatus.h> and thus
clashing with <windows.h> symbols. */
#ifndef STATUS_NOT_SUPPORTED
#define STATUS_NOT_SUPPORTED ((NTSTATUS)0xC00000BB)
#endif
#ifndef STATUS_INVALID_SIGNATURE
#define STATUS_INVALID_SIGNATURE ((NTSTATUS)0xC000A000)
#endif
/*******************************************************************/
/*
* Windows CNG backend: Missing definitions (for MinGW[-w64])
*/
#ifndef BCRYPT_SUCCESS
#define BCRYPT_SUCCESS(Status) (((NTSTATUS)(Status)) >= 0)
#endif
#ifndef BCRYPT_RNG_ALGORITHM
#define BCRYPT_RNG_ALGORITHM L"RNG"
#endif
#if LIBSSH2_MD5 || LIBSSH2_MD5_PEM
#ifndef BCRYPT_MD5_ALGORITHM
#define BCRYPT_MD5_ALGORITHM L"MD5"
#endif
#endif
#ifndef BCRYPT_SHA1_ALGORITHM
#define BCRYPT_SHA1_ALGORITHM L"SHA1"
#endif
#ifndef BCRYPT_SHA256_ALGORITHM
#define BCRYPT_SHA256_ALGORITHM L"SHA256"
#endif
#ifndef BCRYPT_SHA384_ALGORITHM
#define BCRYPT_SHA384_ALGORITHM L"SHA384"
#endif
#ifndef BCRYPT_SHA512_ALGORITHM
#define BCRYPT_SHA512_ALGORITHM L"SHA512"
#endif
#ifndef BCRYPT_RSA_ALGORITHM
#define BCRYPT_RSA_ALGORITHM L"RSA"
#endif
#ifndef BCRYPT_DSA_ALGORITHM
#define BCRYPT_DSA_ALGORITHM L"DSA"
#endif
#ifndef BCRYPT_AES_ALGORITHM
#define BCRYPT_AES_ALGORITHM L"AES"
#endif
#ifndef BCRYPT_RC4_ALGORITHM
#define BCRYPT_RC4_ALGORITHM L"RC4"
#endif
#ifndef BCRYPT_3DES_ALGORITHM
#define BCRYPT_3DES_ALGORITHM L"3DES"
#endif
#ifndef BCRYPT_DH_ALGORITHM
#define BCRYPT_DH_ALGORITHM L"DH"
#endif
/* BCRYPT_KDF_RAW_SECRET is available from Windows 8.1 and onwards */
#ifndef BCRYPT_KDF_RAW_SECRET
#define BCRYPT_KDF_RAW_SECRET L"TRUNCATE"
#endif
#ifndef BCRYPT_ALG_HANDLE_HMAC_FLAG
#define BCRYPT_ALG_HANDLE_HMAC_FLAG 0x00000008
#endif
#ifndef BCRYPT_DSA_PUBLIC_BLOB
#define BCRYPT_DSA_PUBLIC_BLOB L"DSAPUBLICBLOB"
#endif
#ifndef BCRYPT_DSA_PUBLIC_MAGIC
#define BCRYPT_DSA_PUBLIC_MAGIC 0x42505344 /* DSPB */
#endif
#ifndef BCRYPT_DSA_PRIVATE_BLOB
#define BCRYPT_DSA_PRIVATE_BLOB L"DSAPRIVATEBLOB"
#endif
#ifndef BCRYPT_DSA_PRIVATE_MAGIC
#define BCRYPT_DSA_PRIVATE_MAGIC 0x56505344 /* DSPV */
#endif
#ifndef BCRYPT_RSAPUBLIC_BLOB
#define BCRYPT_RSAPUBLIC_BLOB L"RSAPUBLICBLOB"
#endif
#ifndef BCRYPT_RSAPUBLIC_MAGIC
#define BCRYPT_RSAPUBLIC_MAGIC 0x31415352 /* RSA1 */
#endif
#ifndef BCRYPT_RSAFULLPRIVATE_BLOB
#define BCRYPT_RSAFULLPRIVATE_BLOB L"RSAFULLPRIVATEBLOB"
#endif
#ifndef BCRYPT_RSAFULLPRIVATE_MAGIC
#define BCRYPT_RSAFULLPRIVATE_MAGIC 0x33415352 /* RSA3 */
#endif
#ifndef BCRYPT_KEY_DATA_BLOB
#define BCRYPT_KEY_DATA_BLOB L"KeyDataBlob"
#endif
#ifndef BCRYPT_MESSAGE_BLOCK_LENGTH
#define BCRYPT_MESSAGE_BLOCK_LENGTH L"MessageBlockLength"
#endif
#ifndef BCRYPT_NO_KEY_VALIDATION
#define BCRYPT_NO_KEY_VALIDATION 0x00000008
#endif
#ifndef BCRYPT_BLOCK_PADDING
#define BCRYPT_BLOCK_PADDING 0x00000001
#endif
#ifndef BCRYPT_PAD_NONE
#define BCRYPT_PAD_NONE 0x00000001
#endif
#ifndef BCRYPT_PAD_PKCS1
#define BCRYPT_PAD_PKCS1 0x00000002
#endif
#ifndef BCRYPT_PAD_OAEP
#define BCRYPT_PAD_OAEP 0x00000004
#endif
#ifndef BCRYPT_PAD_PSS
#define BCRYPT_PAD_PSS 0x00000008
#endif
#ifndef CRYPT_STRING_ANY
#define CRYPT_STRING_ANY 0x00000007
#endif
#ifndef LEGACY_RSAPRIVATE_BLOB
#define LEGACY_RSAPRIVATE_BLOB L"CAPIPRIVATEBLOB"
#endif
#ifndef PKCS_RSA_PRIVATE_KEY
#define PKCS_RSA_PRIVATE_KEY (LPCSTR)43
#endif
#if defined(_MSC_VER) && _MSC_VER < 1700
/* Workaround for warning C4306:
'type cast' : conversion from 'int' to 'LPCSTR' of greater size */
#undef X509_SEQUENCE_OF_ANY
#undef X509_MULTI_BYTE_UINT
#undef PKCS_RSA_PRIVATE_KEY
#define X509_SEQUENCE_OF_ANY ((LPCSTR)(size_t)34)
#define X509_MULTI_BYTE_UINT ((LPCSTR)(size_t)38)
#define PKCS_RSA_PRIVATE_KEY ((LPCSTR)(size_t)43)
#endif
static int
_libssh2_wincng_bignum_resize(_libssh2_bn* bn, ULONG length);
/*******************************************************************/
/*
* Windows CNG backend: ECDSA-specific declarations.
*/
#if LIBSSH2_ECDSA
typedef enum {
WINCNG_ECC_KEYTYPE_ECDSA = 0,
WINCNG_ECC_KEYTYPE_ECDH = 1,
} _libssh2_wincng_ecc_keytype;
typedef struct __libssh2_wincng_ecdsa_algorithm {
/* Algorithm name */
const char *name;
/* Key length, in bits */
ULONG key_length;
/* Length of each point, in bytes */
ULONG point_length;
/* Name of CNG algorithm provider, */
/* indexed by _libssh2_wincng_ecc_keytype */
LPCWSTR provider[2];
/* Magic for public key import, indexed by _libssh2_wincng_ecc_keytype */
ULONG public_import_magic[2];
/* Magic for private key import, indexed by _libssh2_wincng_ecc_keytype */
ULONG private_import_magic[2];
} _libssh2_wincng_ecdsa_algorithm;
/* Supported algorithms, indexed by libssh2_curve_type */
static _libssh2_wincng_ecdsa_algorithm _wincng_ecdsa_algorithms[] = {
{
"ecdsa-sha2-nistp256",
256,
256 / 8,
{ BCRYPT_ECDSA_P256_ALGORITHM, BCRYPT_ECDH_P256_ALGORITHM },
{ BCRYPT_ECDSA_PUBLIC_P256_MAGIC, BCRYPT_ECDH_PUBLIC_P256_MAGIC },
{ BCRYPT_ECDSA_PRIVATE_P256_MAGIC, BCRYPT_ECDH_PRIVATE_P256_MAGIC }
},
{
"ecdsa-sha2-nistp384",
384,
384 / 8,
{ BCRYPT_ECDSA_P384_ALGORITHM, BCRYPT_ECDH_P384_ALGORITHM },
{ BCRYPT_ECDSA_PUBLIC_P384_MAGIC, BCRYPT_ECDH_PUBLIC_P384_MAGIC },
{ BCRYPT_ECDSA_PRIVATE_P384_MAGIC, BCRYPT_ECDH_PRIVATE_P384_MAGIC }
},
{
"ecdsa-sha2-nistp521",
521,
((521 + 7) & ~7) / 8,
{ BCRYPT_ECDSA_P521_ALGORITHM, BCRYPT_ECDH_P521_ALGORITHM },
{ BCRYPT_ECDSA_PUBLIC_P521_MAGIC, BCRYPT_ECDH_PUBLIC_P521_MAGIC },
{ BCRYPT_ECDSA_PRIVATE_P521_MAGIC, BCRYPT_ECDH_PRIVATE_P521_MAGIC }
},
};
/* An encoded point */
typedef struct __libssh2_ecdsa_point {
libssh2_curve_type curve;
const unsigned char *x;
ULONG x_len;
const unsigned char *y;
ULONG y_len;
} _libssh2_ecdsa_point;
/* Lookup libssh2_curve_type by name */
static int
_libssh2_wincng_ecdsa_curve_type_from_name(IN const char *name,
OUT libssh2_curve_type *out_curve);
/* Parse an OpenSSL-formatted ECDSA private key */
static int
_libssh2_wincng_parse_ecdsa_privatekey(OUT _libssh2_wincng_ecdsa_key **key,
IN unsigned char *privatekey,
IN size_t privatekey_len);
#endif
/*******************************************************************/
/*
* Windows CNG backend: Generic functions
*/
struct _libssh2_wincng_ctx _libssh2_wincng;
void
_libssh2_wincng_init(void)
{
int ret;
#if LIBSSH2_ECDSA
unsigned int curve;
#endif
memset(&_libssh2_wincng, 0, sizeof(_libssh2_wincng));
ret = BCryptOpenAlgorithmProvider(&_libssh2_wincng.hAlgRNG,
BCRYPT_RNG_ALGORITHM, NULL, 0);
if(!BCRYPT_SUCCESS(ret)) {
_libssh2_wincng.hAlgRNG = NULL;
}
#if LIBSSH2_MD5 || LIBSSH2_MD5_PEM
ret = BCryptOpenAlgorithmProvider(&_libssh2_wincng.hAlgHashMD5,
BCRYPT_MD5_ALGORITHM, NULL, 0);
if(!BCRYPT_SUCCESS(ret)) {
_libssh2_wincng.hAlgHashMD5 = NULL;
}
#endif
ret = BCryptOpenAlgorithmProvider(&_libssh2_wincng.hAlgHashSHA1,
BCRYPT_SHA1_ALGORITHM, NULL, 0);
if(!BCRYPT_SUCCESS(ret)) {
_libssh2_wincng.hAlgHashSHA1 = NULL;
}
ret = BCryptOpenAlgorithmProvider(&_libssh2_wincng.hAlgHashSHA256,
BCRYPT_SHA256_ALGORITHM, NULL, 0);
if(!BCRYPT_SUCCESS(ret)) {
_libssh2_wincng.hAlgHashSHA256 = NULL;
}
ret = BCryptOpenAlgorithmProvider(&_libssh2_wincng.hAlgHashSHA384,
BCRYPT_SHA384_ALGORITHM, NULL, 0);
if(!BCRYPT_SUCCESS(ret)) {
_libssh2_wincng.hAlgHashSHA384 = NULL;
}
ret = BCryptOpenAlgorithmProvider(&_libssh2_wincng.hAlgHashSHA512,
BCRYPT_SHA512_ALGORITHM, NULL, 0);
if(!BCRYPT_SUCCESS(ret)) {
_libssh2_wincng.hAlgHashSHA512 = NULL;
}
#if LIBSSH2_MD5
ret = BCryptOpenAlgorithmProvider(&_libssh2_wincng.hAlgHmacMD5,
BCRYPT_MD5_ALGORITHM, NULL,
BCRYPT_ALG_HANDLE_HMAC_FLAG);
if(!BCRYPT_SUCCESS(ret)) {
_libssh2_wincng.hAlgHmacMD5 = NULL;
}
#endif
ret = BCryptOpenAlgorithmProvider(&_libssh2_wincng.hAlgHmacSHA1,
BCRYPT_SHA1_ALGORITHM, NULL,
BCRYPT_ALG_HANDLE_HMAC_FLAG);
if(!BCRYPT_SUCCESS(ret)) {
_libssh2_wincng.hAlgHmacSHA1 = NULL;
}
ret = BCryptOpenAlgorithmProvider(&_libssh2_wincng.hAlgHmacSHA256,
BCRYPT_SHA256_ALGORITHM, NULL,
BCRYPT_ALG_HANDLE_HMAC_FLAG);
if(!BCRYPT_SUCCESS(ret)) {
_libssh2_wincng.hAlgHmacSHA256 = NULL;
}
ret = BCryptOpenAlgorithmProvider(&_libssh2_wincng.hAlgHmacSHA384,
BCRYPT_SHA384_ALGORITHM, NULL,
BCRYPT_ALG_HANDLE_HMAC_FLAG);
if(!BCRYPT_SUCCESS(ret)) {
_libssh2_wincng.hAlgHmacSHA384 = NULL;
}
ret = BCryptOpenAlgorithmProvider(&_libssh2_wincng.hAlgHmacSHA512,
BCRYPT_SHA512_ALGORITHM, NULL,
BCRYPT_ALG_HANDLE_HMAC_FLAG);
if(!BCRYPT_SUCCESS(ret)) {
_libssh2_wincng.hAlgHmacSHA512 = NULL;
}
ret = BCryptOpenAlgorithmProvider(&_libssh2_wincng.hAlgRSA,
BCRYPT_RSA_ALGORITHM, NULL, 0);
if(!BCRYPT_SUCCESS(ret)) {
_libssh2_wincng.hAlgRSA = NULL;
}
ret = BCryptOpenAlgorithmProvider(&_libssh2_wincng.hAlgDSA,
BCRYPT_DSA_ALGORITHM, NULL, 0);
if(!BCRYPT_SUCCESS(ret)) {
_libssh2_wincng.hAlgDSA = NULL;
}
ret = BCryptOpenAlgorithmProvider(&_libssh2_wincng.hAlgAES_CBC,
BCRYPT_AES_ALGORITHM, NULL, 0);
if(BCRYPT_SUCCESS(ret)) {
ret = BCryptSetProperty(_libssh2_wincng.hAlgAES_CBC,
BCRYPT_CHAINING_MODE,
(PBYTE)BCRYPT_CHAIN_MODE_CBC,
sizeof(BCRYPT_CHAIN_MODE_CBC), 0);
if(!BCRYPT_SUCCESS(ret)) {
ret = BCryptCloseAlgorithmProvider(_libssh2_wincng.hAlgAES_CBC, 0);
if(BCRYPT_SUCCESS(ret)) {
_libssh2_wincng.hAlgAES_CBC = NULL;
}
}
}
ret = BCryptOpenAlgorithmProvider(&_libssh2_wincng.hAlgAES_ECB,
BCRYPT_AES_ALGORITHM, NULL, 0);
if(BCRYPT_SUCCESS(ret)) {
ret = BCryptSetProperty(_libssh2_wincng.hAlgAES_ECB,
BCRYPT_CHAINING_MODE,
(PBYTE)BCRYPT_CHAIN_MODE_ECB,
sizeof(BCRYPT_CHAIN_MODE_ECB), 0);
if(!BCRYPT_SUCCESS(ret)) {
ret = BCryptCloseAlgorithmProvider(_libssh2_wincng.hAlgAES_ECB, 0);
if(BCRYPT_SUCCESS(ret)) {
_libssh2_wincng.hAlgAES_ECB = NULL;
}
}
}
ret = BCryptOpenAlgorithmProvider(&_libssh2_wincng.hAlgRC4_NA,
BCRYPT_RC4_ALGORITHM, NULL, 0);
if(BCRYPT_SUCCESS(ret)) {
ret = BCryptSetProperty(_libssh2_wincng.hAlgRC4_NA,
BCRYPT_CHAINING_MODE,
(PBYTE)BCRYPT_CHAIN_MODE_NA,
sizeof(BCRYPT_CHAIN_MODE_NA), 0);
if(!BCRYPT_SUCCESS(ret)) {
ret = BCryptCloseAlgorithmProvider(_libssh2_wincng.hAlgRC4_NA, 0);
if(BCRYPT_SUCCESS(ret)) {
_libssh2_wincng.hAlgRC4_NA = NULL;
}
}
}
ret = BCryptOpenAlgorithmProvider(&_libssh2_wincng.hAlg3DES_CBC,
BCRYPT_3DES_ALGORITHM, NULL, 0);
if(BCRYPT_SUCCESS(ret)) {
ret = BCryptSetProperty(_libssh2_wincng.hAlg3DES_CBC,
BCRYPT_CHAINING_MODE,
(PBYTE)BCRYPT_CHAIN_MODE_CBC,
sizeof(BCRYPT_CHAIN_MODE_CBC), 0);
if(!BCRYPT_SUCCESS(ret)) {
ret = BCryptCloseAlgorithmProvider(_libssh2_wincng.hAlg3DES_CBC,
0);
if(BCRYPT_SUCCESS(ret)) {
_libssh2_wincng.hAlg3DES_CBC = NULL;
}
}
}
ret = BCryptOpenAlgorithmProvider(&_libssh2_wincng.hAlgDH,
BCRYPT_DH_ALGORITHM, NULL, 0);
if(!BCRYPT_SUCCESS(ret)) {
_libssh2_wincng.hAlgDH = NULL;
}
#if LIBSSH2_ECDSA
for(curve = 0; curve < ARRAY_SIZE(_wincng_ecdsa_algorithms); curve++) {
BCRYPT_ALG_HANDLE alg_handle_ecdsa;
BCRYPT_ALG_HANDLE alg_handle_ecdh;
ret = BCryptOpenAlgorithmProvider(
&alg_handle_ecdsa,
_wincng_ecdsa_algorithms[curve].provider[WINCNG_ECC_KEYTYPE_ECDSA],
NULL,
0);
if(BCRYPT_SUCCESS(ret)) {
_libssh2_wincng.hAlgECDSA[curve] = alg_handle_ecdsa;
}
ret = BCryptOpenAlgorithmProvider(
&alg_handle_ecdh,
_wincng_ecdsa_algorithms[curve].provider[WINCNG_ECC_KEYTYPE_ECDH],
NULL,
0);
if(BCRYPT_SUCCESS(ret)) {
_libssh2_wincng.hAlgECDH[curve] = alg_handle_ecdh;
}
}
#endif
}
void
_libssh2_wincng_free(void)
{
#if LIBSSH2_ECDSA
unsigned int curve;
#endif
if(_libssh2_wincng.hAlgRNG)
(void)BCryptCloseAlgorithmProvider(_libssh2_wincng.hAlgRNG, 0);
#if LIBSSH2_MD5 || LIBSSH2_MD5_PEM
if(_libssh2_wincng.hAlgHashMD5)
(void)BCryptCloseAlgorithmProvider(_libssh2_wincng.hAlgHashMD5, 0);
#endif
if(_libssh2_wincng.hAlgHashSHA1)
(void)BCryptCloseAlgorithmProvider(_libssh2_wincng.hAlgHashSHA1, 0);
if(_libssh2_wincng.hAlgHashSHA256)
(void)BCryptCloseAlgorithmProvider(_libssh2_wincng.hAlgHashSHA256, 0);
if(_libssh2_wincng.hAlgHashSHA384)
(void)BCryptCloseAlgorithmProvider(_libssh2_wincng.hAlgHashSHA384, 0);
if(_libssh2_wincng.hAlgHashSHA512)
(void)BCryptCloseAlgorithmProvider(_libssh2_wincng.hAlgHashSHA512, 0);
#if LIBSSH2_MD5
if(_libssh2_wincng.hAlgHmacMD5)
(void)BCryptCloseAlgorithmProvider(_libssh2_wincng.hAlgHmacMD5, 0);
#endif
if(_libssh2_wincng.hAlgHmacSHA1)
(void)BCryptCloseAlgorithmProvider(_libssh2_wincng.hAlgHmacSHA1, 0);
if(_libssh2_wincng.hAlgHmacSHA256)
(void)BCryptCloseAlgorithmProvider(_libssh2_wincng.hAlgHmacSHA256, 0);
if(_libssh2_wincng.hAlgHmacSHA384)
(void)BCryptCloseAlgorithmProvider(_libssh2_wincng.hAlgHmacSHA384, 0);
if(_libssh2_wincng.hAlgHmacSHA512)
(void)BCryptCloseAlgorithmProvider(_libssh2_wincng.hAlgHmacSHA512, 0);
if(_libssh2_wincng.hAlgRSA)
(void)BCryptCloseAlgorithmProvider(_libssh2_wincng.hAlgRSA, 0);
if(_libssh2_wincng.hAlgDSA)
(void)BCryptCloseAlgorithmProvider(_libssh2_wincng.hAlgDSA, 0);
if(_libssh2_wincng.hAlgAES_CBC)
(void)BCryptCloseAlgorithmProvider(_libssh2_wincng.hAlgAES_CBC, 0);
if(_libssh2_wincng.hAlgRC4_NA)
(void)BCryptCloseAlgorithmProvider(_libssh2_wincng.hAlgRC4_NA, 0);
if(_libssh2_wincng.hAlg3DES_CBC)
(void)BCryptCloseAlgorithmProvider(_libssh2_wincng.hAlg3DES_CBC, 0);
if(_libssh2_wincng.hAlgDH)
(void)BCryptCloseAlgorithmProvider(_libssh2_wincng.hAlgDH, 0);
#if LIBSSH2_ECDSA
for(curve = 0; curve < ARRAY_SIZE(_wincng_ecdsa_algorithms); curve++) {
(void)BCryptCloseAlgorithmProvider(_libssh2_wincng.hAlgECDSA[curve],
0);
(void)BCryptCloseAlgorithmProvider(_libssh2_wincng.hAlgECDH[curve],
0);
}
#endif
memset(&_libssh2_wincng, 0, sizeof(_libssh2_wincng));
}
int
_libssh2_wincng_random(void *buf, size_t len)
{
int ret;
if(len > ULONG_MAX) {
return -1;
}
ret = BCryptGenRandom(_libssh2_wincng.hAlgRNG, buf, (ULONG)len, 0);
return BCRYPT_SUCCESS(ret) ? 0 : -1;
}
static void
_libssh2_wincng_safe_free(void *buf, size_t len)
{
if(!buf)
return;
if(len > 0)
_libssh2_explicit_zero(buf, len);
free(buf);
}
/* Copy a big endian set of bits from src to dest.
* if the size of src is smaller than dest then pad the "left" (MSB)
* end with zeroes and copy the bits into the "right" (LSB) end. */
static void
memcpy_with_be_padding(unsigned char *dest, ULONG dest_len,
unsigned char *src, ULONG src_len)
{
if(dest_len > src_len) {
memset(dest, 0, dest_len - src_len);
}
memcpy((dest + dest_len) - src_len, src, src_len);
}
/*******************************************************************/
/*
* Windows CNG backend: Hash functions
*/
int
_libssh2_wincng_hash_init(_libssh2_wincng_hash_ctx *ctx,
BCRYPT_ALG_HANDLE hAlg, ULONG hashlen,
unsigned char *key, ULONG keylen)
{
BCRYPT_HASH_HANDLE hHash;
unsigned char *pbHashObject;
ULONG dwHashObject, dwHash, cbData;
int ret;
ret = BCryptGetProperty(hAlg, BCRYPT_HASH_LENGTH,
(unsigned char *)&dwHash,
sizeof(dwHash),
&cbData, 0);
if((!BCRYPT_SUCCESS(ret)) || dwHash != hashlen) {
return -1;
}
ret = BCryptGetProperty(hAlg, BCRYPT_OBJECT_LENGTH,
(unsigned char *)&dwHashObject,
sizeof(dwHashObject),
&cbData, 0);
if(!BCRYPT_SUCCESS(ret)) {
return -1;
}
pbHashObject = malloc(dwHashObject);
if(!pbHashObject) {
return -1;
}
ret = BCryptCreateHash(hAlg, &hHash,
pbHashObject, dwHashObject,
key, keylen, 0);
if(!BCRYPT_SUCCESS(ret)) {
_libssh2_wincng_safe_free(pbHashObject, dwHashObject);
return -1;
}
ctx->hHash = hHash;
ctx->pbHashObject = pbHashObject;
ctx->dwHashObject = dwHashObject;
ctx->cbHash = dwHash;
return 0;
}
int
_libssh2_wincng_hash_update(_libssh2_wincng_hash_ctx *ctx,
const void *data, ULONG datalen)
{
int ret;
ret = BCryptHashData(ctx->hHash, (PUCHAR)data, datalen, 0);
return BCRYPT_SUCCESS(ret) ? 0 : -1;
}
int
_libssh2_wincng_hash_final(_libssh2_wincng_hash_ctx *ctx,
unsigned char *hash)
{
int ret;
ret = BCryptFinishHash(ctx->hHash, hash, ctx->cbHash, 0);
BCryptDestroyHash(ctx->hHash);
ctx->hHash = NULL;
_libssh2_wincng_safe_free(ctx->pbHashObject, ctx->dwHashObject);
ctx->pbHashObject = NULL;
ctx->dwHashObject = 0;
return BCRYPT_SUCCESS(ret) ? 0 : -1;
}
int
_libssh2_wincng_hash(const unsigned char *data, ULONG datalen,
BCRYPT_ALG_HANDLE hAlg,
unsigned char *hash, ULONG hashlen)
{
_libssh2_wincng_hash_ctx ctx;
int ret;
ret = _libssh2_wincng_hash_init(&ctx, hAlg, hashlen, NULL, 0);
if(!ret) {
ret = _libssh2_wincng_hash_update(&ctx, data, datalen);
ret |= _libssh2_wincng_hash_final(&ctx, hash);
}
return ret;
}
/*******************************************************************/
/*
* Windows CNG backend: HMAC functions
*/
int _libssh2_hmac_ctx_init(libssh2_hmac_ctx *ctx)
{
memset(ctx, 0, sizeof(*ctx));
return 1;
}
#if LIBSSH2_MD5
int _libssh2_hmac_md5_init(libssh2_hmac_ctx *ctx,
void *key, size_t keylen)
{
int ret = _libssh2_wincng_hash_init(ctx, _libssh2_wincng.hAlgHmacMD5,
MD5_DIGEST_LENGTH,
key, (ULONG) keylen);
return ret == 0 ? 1 : 0;
}
#endif
int _libssh2_hmac_sha1_init(libssh2_hmac_ctx *ctx,
void *key, size_t keylen)
{
int ret = _libssh2_wincng_hash_init(ctx, _libssh2_wincng.hAlgHmacSHA1,
SHA_DIGEST_LENGTH,
key, (ULONG) keylen);
return ret == 0 ? 1 : 0;
}
int _libssh2_hmac_sha256_init(libssh2_hmac_ctx *ctx,
void *key, size_t keylen)
{
int ret = _libssh2_wincng_hash_init(ctx, _libssh2_wincng.hAlgHmacSHA256,
SHA256_DIGEST_LENGTH,
key, (ULONG) keylen);
return ret == 0 ? 1 : 0;
}
int _libssh2_hmac_sha512_init(libssh2_hmac_ctx *ctx,
void *key, size_t keylen)
{
int ret = _libssh2_wincng_hash_init(ctx, _libssh2_wincng.hAlgHmacSHA512,
SHA512_DIGEST_LENGTH,
key, (ULONG) keylen);
return ret == 0 ? 1 : 0;
}
int _libssh2_hmac_update(libssh2_hmac_ctx *ctx,
const void *data, size_t datalen)
{
int ret = _libssh2_wincng_hash_update(ctx, data, (ULONG) datalen);
return ret == 0 ? 1 : 0;
}
int _libssh2_hmac_final(libssh2_hmac_ctx *ctx, void *data)
{
int ret = BCryptFinishHash(ctx->hHash, data, ctx->cbHash, 0);
return BCRYPT_SUCCESS(ret) ? 1 : 0;
}
void _libssh2_hmac_cleanup(libssh2_hmac_ctx *ctx)
{
BCryptDestroyHash(ctx->hHash);
ctx->hHash = NULL;
_libssh2_wincng_safe_free(ctx->pbHashObject, ctx->dwHashObject);
ctx->pbHashObject = NULL;
ctx->dwHashObject = 0;
}
/*******************************************************************/
/*
* Windows CNG backend: Key functions
*/
static int
_libssh2_wincng_key_sha_verify(_libssh2_wincng_key_ctx *ctx,
ULONG hashlen,
const unsigned char *sig,
ULONG sig_len,
const unsigned char *m,
ULONG m_len,
ULONG flags)
{
BCRYPT_PKCS1_PADDING_INFO paddingInfoPKCS1;
BCRYPT_ALG_HANDLE hAlgHash;
void *pPaddingInfo;
unsigned char *data, *hash;
ULONG datalen;
int ret;
if(hashlen == SHA_DIGEST_LENGTH) {
hAlgHash = _libssh2_wincng.hAlgHashSHA1;
paddingInfoPKCS1.pszAlgId = BCRYPT_SHA1_ALGORITHM;
}
else if(hashlen == SHA256_DIGEST_LENGTH) {
hAlgHash = _libssh2_wincng.hAlgHashSHA256;
paddingInfoPKCS1.pszAlgId = BCRYPT_SHA256_ALGORITHM;
}
else if(hashlen == SHA384_DIGEST_LENGTH) {
hAlgHash = _libssh2_wincng.hAlgHashSHA384;
paddingInfoPKCS1.pszAlgId = BCRYPT_SHA384_ALGORITHM;
}
else if(hashlen == SHA512_DIGEST_LENGTH) {
hAlgHash = _libssh2_wincng.hAlgHashSHA512;
paddingInfoPKCS1.pszAlgId = BCRYPT_SHA512_ALGORITHM;
}
else {
return -1;
}
datalen = m_len;
data = malloc(datalen);
if(!data) {
return -1;
}
hash = malloc(hashlen);
if(!hash) {
free(data);
return -1;
}
memcpy(data, m, datalen);
ret = _libssh2_wincng_hash(data, datalen,
hAlgHash,
hash, hashlen);
_libssh2_wincng_safe_free(data, datalen);
if(ret) {
_libssh2_wincng_safe_free(hash, hashlen);
return -1;
}
datalen = sig_len;
data = malloc(datalen);
if(!data) {
_libssh2_wincng_safe_free(hash, hashlen);
return -1;
}
if(flags & BCRYPT_PAD_PKCS1) {
pPaddingInfo = &paddingInfoPKCS1;
}
else
pPaddingInfo = NULL;
memcpy(data, sig, datalen);
ret = BCryptVerifySignature(ctx->hKey, pPaddingInfo,
hash, hashlen, data, datalen, flags);
_libssh2_wincng_safe_free(hash, hashlen);
_libssh2_wincng_safe_free(data, datalen);
return BCRYPT_SUCCESS(ret) ? 0 : -1;
}
#ifdef HAVE_LIBCRYPT32
static int
_libssh2_wincng_load_pem(LIBSSH2_SESSION *session,
const char *filename,
const unsigned char *passphrase,
const char *headerbegin,
const char *headerend,
unsigned char **data,
size_t *datalen)
{
FILE *fp;
int ret;
fp = fopen(filename, FOPEN_READTEXT);
if(!fp) {
return -1;
}
ret = _libssh2_pem_parse(session, headerbegin, headerend,
passphrase,
fp, data, datalen);
fclose(fp);
return ret;
}
static int
_libssh2_wincng_load_private(LIBSSH2_SESSION *session,
const char *filename,
const unsigned char *passphrase,
unsigned char **ppbEncoded,
size_t *pcbEncoded,
int tryLoadRSA, int tryLoadDSA)
{
unsigned char *data = NULL;
size_t datalen = 0;
int ret = -1;
if(ret && tryLoadRSA) {
ret = _libssh2_wincng_load_pem(session, filename, passphrase,
PEM_RSA_HEADER, PEM_RSA_FOOTER,
&data, &datalen);
}
if(ret && tryLoadDSA) {
ret = _libssh2_wincng_load_pem(session, filename, passphrase,
PEM_DSA_HEADER, PEM_DSA_FOOTER,
&data, &datalen);
}
if(!ret) {
*ppbEncoded = data;
*pcbEncoded = datalen;
}
return ret;
}
static int
_libssh2_wincng_load_private_memory(LIBSSH2_SESSION *session,
const char *privatekeydata,
size_t privatekeydata_len,
const unsigned char *passphrase,
unsigned char **ppbEncoded,
size_t *pcbEncoded,
int tryLoadRSA, int tryLoadDSA)
{
unsigned char *data = NULL;
size_t datalen = 0;
int ret = -1;
(void)passphrase;
if(ret && tryLoadRSA) {
ret = _libssh2_pem_parse_memory(session,
PEM_RSA_HEADER, PEM_RSA_FOOTER,
privatekeydata, privatekeydata_len,
&data, &datalen);
}
if(ret && tryLoadDSA) {
ret = _libssh2_pem_parse_memory(session,
PEM_DSA_HEADER, PEM_DSA_FOOTER,
privatekeydata, privatekeydata_len,
&data, &datalen);
}
if(!ret) {
*ppbEncoded = data;
*pcbEncoded = datalen;
}
return ret;
}
static int
_libssh2_wincng_asn_decode(unsigned char *pbEncoded,
DWORD cbEncoded,
LPCSTR lpszStructType,
unsigned char **ppbDecoded,
DWORD *pcbDecoded)
{
unsigned char *pbDecoded = NULL;
DWORD cbDecoded = 0;
int ret;
ret = CryptDecodeObjectEx(X509_ASN_ENCODING | PKCS_7_ASN_ENCODING,
lpszStructType,
pbEncoded, cbEncoded, 0, NULL,
NULL, &cbDecoded);
if(!ret) {
return -1;
}