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wincng.c
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wincng.c
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/*
* Copyright (C) 2013-2015 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.
*/
#include "libssh2_priv.h"
#ifdef LIBSSH2_WINCNG /* compile only if we build with wincng */
/* 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
/* 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 "misc.h"
#ifdef HAVE_STDLIB_H
#include <stdlib.h>
#endif
#ifdef HAVE_LIBCRYPT32
#include <wincrypt.h>
#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-----"
/*******************************************************************/
/*
* 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
#ifndef BCRYPT_MD5_ALGORITHM
#define BCRYPT_MD5_ALGORITHM L"MD5"
#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_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_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
/*******************************************************************/
/*
* Windows CNG backend: Generic functions
*/
int
_libssh2_wincng_init(void)
{
int ret;
ret = BCryptOpenAlgorithmProvider(&_libssh2_wincng.hAlgRNG,
BCRYPT_RNG_ALGORITHM, NULL, 0);
if(!BCRYPT_SUCCESS(ret))
return -1;
ret = BCryptOpenAlgorithmProvider(&_libssh2_wincng.hAlgHashMD5,
BCRYPT_MD5_ALGORITHM, NULL, 0);
if(!BCRYPT_SUCCESS(ret))
return -1;
ret = BCryptOpenAlgorithmProvider(&_libssh2_wincng.hAlgHashSHA1,
BCRYPT_SHA1_ALGORITHM, NULL, 0);
if(!BCRYPT_SUCCESS(ret))
return -1;
ret = BCryptOpenAlgorithmProvider(&_libssh2_wincng.hAlgHashSHA256,
BCRYPT_SHA256_ALGORITHM, NULL, 0);
if(!BCRYPT_SUCCESS(ret))
return -1;
ret = BCryptOpenAlgorithmProvider(&_libssh2_wincng.hAlgHashSHA512,
BCRYPT_SHA512_ALGORITHM, NULL, 0);
if(!BCRYPT_SUCCESS(ret))
return -1;
ret = BCryptOpenAlgorithmProvider(&_libssh2_wincng.hAlgHmacMD5,
BCRYPT_MD5_ALGORITHM, NULL,
BCRYPT_ALG_HANDLE_HMAC_FLAG);
if(!BCRYPT_SUCCESS(ret))
return -1;
ret = BCryptOpenAlgorithmProvider(&_libssh2_wincng.hAlgHmacSHA1,
BCRYPT_SHA1_ALGORITHM, NULL,
BCRYPT_ALG_HANDLE_HMAC_FLAG);
if(!BCRYPT_SUCCESS(ret))
return -1;
ret = BCryptOpenAlgorithmProvider(&_libssh2_wincng.hAlgHmacSHA256,
BCRYPT_SHA256_ALGORITHM, NULL,
BCRYPT_ALG_HANDLE_HMAC_FLAG);
if(!BCRYPT_SUCCESS(ret))
return -1;
ret = BCryptOpenAlgorithmProvider(&_libssh2_wincng.hAlgHmacSHA512,
BCRYPT_SHA512_ALGORITHM, NULL,
BCRYPT_ALG_HANDLE_HMAC_FLAG);
if(!BCRYPT_SUCCESS(ret))
return -1;
ret = BCryptOpenAlgorithmProvider(&_libssh2_wincng.hAlgRSA,
BCRYPT_RSA_ALGORITHM, NULL, 0);
if(!BCRYPT_SUCCESS(ret))
return -1;
ret = BCryptOpenAlgorithmProvider(&_libssh2_wincng.hAlgDSA,
BCRYPT_DSA_ALGORITHM, NULL, 0);
if(!BCRYPT_SUCCESS(ret))
return -1;
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)) {
(void)BCryptCloseAlgorithmProvider(_libssh2_wincng.hAlgAES_CBC, 0);
return -1;
}
}
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)) {
(void)BCryptCloseAlgorithmProvider(_libssh2_wincng.hAlgAES_ECB, 0);
return -1;
}
}
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)) {
(void)BCryptCloseAlgorithmProvider(_libssh2_wincng.hAlgRC4_NA, 0);
return -1;
}
}
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)) {
(void)BCryptCloseAlgorithmProvider(_libssh2_wincng.hAlg3DES_CBC,
0);
return -1;
}
}
return 0;
}
void
_libssh2_wincng_free(void)
{
(void)BCryptCloseAlgorithmProvider(_libssh2_wincng.hAlgRNG, 0);
(void)BCryptCloseAlgorithmProvider(_libssh2_wincng.hAlgHashMD5, 0);
(void)BCryptCloseAlgorithmProvider(_libssh2_wincng.hAlgHashSHA1, 0);
(void)BCryptCloseAlgorithmProvider(_libssh2_wincng.hAlgHashSHA256, 0);
(void)BCryptCloseAlgorithmProvider(_libssh2_wincng.hAlgHashSHA512, 0);
(void)BCryptCloseAlgorithmProvider(_libssh2_wincng.hAlgHmacMD5, 0);
(void)BCryptCloseAlgorithmProvider(_libssh2_wincng.hAlgHmacSHA1, 0);
(void)BCryptCloseAlgorithmProvider(_libssh2_wincng.hAlgHmacSHA256, 0);
(void)BCryptCloseAlgorithmProvider(_libssh2_wincng.hAlgHmacSHA512, 0);
(void)BCryptCloseAlgorithmProvider(_libssh2_wincng.hAlgRSA, 0);
(void)BCryptCloseAlgorithmProvider(_libssh2_wincng.hAlgDSA, 0);
(void)BCryptCloseAlgorithmProvider(_libssh2_wincng.hAlgAES_CBC, 0);
(void)BCryptCloseAlgorithmProvider(_libssh2_wincng.hAlgRC4_NA, 0);
(void)BCryptCloseAlgorithmProvider(_libssh2_wincng.hAlg3DES_CBC, 0);
memset(&_libssh2_wincng, 0, sizeof(_libssh2_wincng));
}
int
_libssh2_wincng_random(void *buf, int len)
{
int ret;
ret = BCryptGenRandom(_libssh2_wincng.hAlgRNG, buf, len, 0);
return BCRYPT_SUCCESS(ret) ? 0 : -1;
}
static void
_libssh2_wincng_safe_free(void *buf, int len)
{
#ifndef LIBSSH2_CLEAR_MEMORY
(void)len;
#endif
if(!buf)
return;
#ifdef LIBSSH2_CLEAR_MEMORY
if(len > 0)
SecureZeroMemory(buf, len);
#endif
free(buf);
}
/*******************************************************************/
/*
* Windows CNG backend: Hash functions
*/
int
_libssh2_wincng_hash_init(_libssh2_wincng_hash_ctx *ctx,
BCRYPT_ALG_HANDLE hAlg, unsigned long hashlen,
unsigned char *key, unsigned long keylen)
{
BCRYPT_HASH_HANDLE hHash;
unsigned char *pbHashObject;
unsigned long 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 unsigned char *data, unsigned long datalen)
{
int ret;
ret = BCryptHashData(ctx->hHash, (unsigned char *)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(unsigned char *data, unsigned long datalen,
BCRYPT_ALG_HANDLE hAlg,
unsigned char *hash, unsigned long 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_wincng_hmac_final(_libssh2_wincng_hash_ctx *ctx,
unsigned char *hash)
{
int ret;
ret = BCryptFinishHash(ctx->hHash, hash, ctx->cbHash, 0);
return BCRYPT_SUCCESS(ret) ? 0 : -1;
}
void
_libssh2_wincng_hmac_cleanup(_libssh2_wincng_hash_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
*/
int
_libssh2_wincng_key_sha1_verify(_libssh2_wincng_key_ctx *ctx,
const unsigned char *sig,
unsigned long sig_len,
const unsigned char *m,
unsigned long m_len,
unsigned long flags)
{
BCRYPT_PKCS1_PADDING_INFO paddingInfoPKCS1;
void *pPaddingInfo;
unsigned char *data, *hash;
unsigned long datalen, hashlen;
int ret;
datalen = m_len;
data = malloc(datalen);
if(!data) {
return -1;
}
hashlen = SHA_DIGEST_LENGTH;
hash = malloc(hashlen);
if(!hash) {
free(data);
return -1;
}
memcpy(data, m, datalen);
ret = _libssh2_wincng_hash(data, datalen,
_libssh2_wincng.hAlgHashSHA1,
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) {
paddingInfoPKCS1.pszAlgId = BCRYPT_SHA1_ALGORITHM;
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 char *passphrase,
const char *headerbegin,
const char *headerend,
unsigned char **data,
unsigned int *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 char *passphrase,
unsigned char **ppbEncoded,
unsigned long *pcbEncoded,
int tryLoadRSA, int tryLoadDSA)
{
unsigned char *data = NULL;
unsigned int 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 char *passphrase,
unsigned char **ppbEncoded,
unsigned long *pcbEncoded,
int tryLoadRSA, int tryLoadDSA)
{
unsigned char *data = NULL;
unsigned int 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,
unsigned long cbEncoded,
LPCSTR lpszStructType,
unsigned char **ppbDecoded,
unsigned long *pcbDecoded)
{
unsigned char *pbDecoded = NULL;
unsigned long cbDecoded = 0;
int ret;
ret = CryptDecodeObjectEx(X509_ASN_ENCODING | PKCS_7_ASN_ENCODING,
lpszStructType,
pbEncoded, cbEncoded, 0, NULL,
NULL, &cbDecoded);
if(!ret) {
return -1;
}
pbDecoded = malloc(cbDecoded);
if(!pbDecoded) {
return -1;
}
ret = CryptDecodeObjectEx(X509_ASN_ENCODING | PKCS_7_ASN_ENCODING,
lpszStructType,
pbEncoded, cbEncoded, 0, NULL,
pbDecoded, &cbDecoded);
if(!ret) {
_libssh2_wincng_safe_free(pbDecoded, cbDecoded);
return -1;
}
*ppbDecoded = pbDecoded;
*pcbDecoded = cbDecoded;
return 0;
}
static int
_libssh2_wincng_bn_ltob(unsigned char *pbInput,
unsigned long cbInput,
unsigned char **ppbOutput,
unsigned long *pcbOutput)
{
unsigned char *pbOutput;
unsigned long cbOutput, index, offset, length;
if(cbInput < 1) {
return 0;
}
offset = 0;
length = cbInput - 1;
cbOutput = cbInput;
if(pbInput[length] & (1 << 7)) {
offset++;
cbOutput += offset;
}
pbOutput = (unsigned char *)malloc(cbOutput);
if(!pbOutput) {
return -1;
}
pbOutput[0] = 0;
for(index = 0; ((index + offset) < cbOutput)
&& (index < cbInput); index++) {
pbOutput[index + offset] = pbInput[length - index];
}
*ppbOutput = pbOutput;
*pcbOutput = cbOutput;
return 0;
}
static int
_libssh2_wincng_asn_decode_bn(unsigned char *pbEncoded,
unsigned long cbEncoded,
unsigned char **ppbDecoded,
unsigned long *pcbDecoded)
{
unsigned char *pbDecoded = NULL, *pbInteger;
unsigned long cbDecoded = 0, cbInteger;
int ret;
ret = _libssh2_wincng_asn_decode(pbEncoded, cbEncoded,
X509_MULTI_BYTE_UINT,
&pbInteger, &cbInteger);
if(!ret) {
ret = _libssh2_wincng_bn_ltob(((PCRYPT_DATA_BLOB)pbInteger)->pbData,
((PCRYPT_DATA_BLOB)pbInteger)->cbData,
&pbDecoded, &cbDecoded);
if(!ret) {
*ppbDecoded = pbDecoded;
*pcbDecoded = cbDecoded;
}
_libssh2_wincng_safe_free(pbInteger, cbInteger);
}
return ret;
}
static int
_libssh2_wincng_asn_decode_bns(unsigned char *pbEncoded,
unsigned long cbEncoded,
unsigned char ***prpbDecoded,
unsigned long **prcbDecoded,
unsigned long *pcbCount)
{
PCRYPT_DER_BLOB pBlob;
unsigned char *pbDecoded, **rpbDecoded;
unsigned long cbDecoded, *rcbDecoded, index, length;
int ret;
ret = _libssh2_wincng_asn_decode(pbEncoded, cbEncoded,
X509_SEQUENCE_OF_ANY,
&pbDecoded, &cbDecoded);
if(!ret) {
length = ((PCRYPT_DATA_BLOB)pbDecoded)->cbData;
rpbDecoded = malloc(sizeof(PBYTE) * length);
if(rpbDecoded) {
rcbDecoded = malloc(sizeof(DWORD) * length);
if(rcbDecoded) {
for(index = 0; index < length; index++) {
pBlob = &((PCRYPT_DER_BLOB)
((PCRYPT_DATA_BLOB)pbDecoded)->pbData)[index];
ret = _libssh2_wincng_asn_decode_bn(pBlob->pbData,
pBlob->cbData,
&rpbDecoded[index],
&rcbDecoded[index]);
if(ret)
break;
}
if(!ret) {
*prpbDecoded = rpbDecoded;
*prcbDecoded = rcbDecoded;
*pcbCount = length;
}
else {
for(length = 0; length < index; length++) {
_libssh2_wincng_safe_free(rpbDecoded[length],
rcbDecoded[length]);
rpbDecoded[length] = NULL;
rcbDecoded[length] = 0;
}
free(rpbDecoded);
free(rcbDecoded);
}
}
else {
free(rpbDecoded);
ret = -1;
}
}
else {
ret = -1;
}
_libssh2_wincng_safe_free(pbDecoded, cbDecoded);
}
return ret;
}
#endif /* HAVE_LIBCRYPT32 */
static unsigned long
_libssh2_wincng_bn_size(const unsigned char *bignum,
unsigned long length)
{
unsigned long offset;
if(!bignum)
return 0;
length--;
offset = 0;
while(!(*(bignum + offset)) && (offset < length))
offset++;
length++;
return length - offset;
}
/*******************************************************************/
/*
* Windows CNG backend: RSA functions
*/
int
_libssh2_wincng_rsa_new(libssh2_rsa_ctx **rsa,
const unsigned char *edata,
unsigned long elen,
const unsigned char *ndata,
unsigned long nlen,
const unsigned char *ddata,
unsigned long dlen,
const unsigned char *pdata,
unsigned long plen,
const unsigned char *qdata,
unsigned long qlen,
const unsigned char *e1data,
unsigned long e1len,
const unsigned char *e2data,
unsigned long e2len,
const unsigned char *coeffdata,
unsigned long coefflen)
{
BCRYPT_KEY_HANDLE hKey;
BCRYPT_RSAKEY_BLOB *rsakey;
LPCWSTR lpszBlobType;
unsigned char *key;
unsigned long keylen, offset, mlen, p1len = 0, p2len = 0;
int ret;
mlen = max(_libssh2_wincng_bn_size(ndata, nlen),
_libssh2_wincng_bn_size(ddata, dlen));
offset = sizeof(BCRYPT_RSAKEY_BLOB);
keylen = offset + elen + mlen;
if(ddata && dlen > 0) {
p1len = max(_libssh2_wincng_bn_size(pdata, plen),
_libssh2_wincng_bn_size(e1data, e1len));
p2len = max(_libssh2_wincng_bn_size(qdata, qlen),
_libssh2_wincng_bn_size(e2data, e2len));
keylen += p1len * 3 + p2len * 2 + mlen;
}
key = malloc(keylen);
if(!key) {
return -1;
}
memset(key, 0, keylen);
/* https://msdn.microsoft.com/library/windows/desktop/aa375531.aspx */
rsakey = (BCRYPT_RSAKEY_BLOB *)key;
rsakey->BitLength = mlen * 8;
rsakey->cbPublicExp = elen;
rsakey->cbModulus = mlen;
memcpy(key + offset, edata, elen);
offset += elen;
if(nlen < mlen)
memcpy(key + offset + mlen - nlen, ndata, nlen);
else
memcpy(key + offset, ndata + nlen - mlen, mlen);
if(ddata && dlen > 0) {
offset += mlen;
if(plen < p1len)
memcpy(key + offset + p1len - plen, pdata, plen);
else
memcpy(key + offset, pdata + plen - p1len, p1len);
offset += p1len;
if(qlen < p2len)
memcpy(key + offset + p2len - qlen, qdata, qlen);
else
memcpy(key + offset, qdata + qlen - p2len, p2len);
offset += p2len;
if(e1len < p1len)
memcpy(key + offset + p1len - e1len, e1data, e1len);
else
memcpy(key + offset, e1data + e1len - p1len, p1len);
offset += p1len;
if(e2len < p2len)
memcpy(key + offset + p2len - e2len, e2data, e2len);
else
memcpy(key + offset, e2data + e2len - p2len, p2len);
offset += p2len;
if(coefflen < p1len)
memcpy(key + offset + p1len - coefflen, coeffdata, coefflen);
else
memcpy(key + offset, coeffdata + coefflen - p1len, p1len);
offset += p1len;
if(dlen < mlen)
memcpy(key + offset + mlen - dlen, ddata, dlen);
else
memcpy(key + offset, ddata + dlen - mlen, mlen);
lpszBlobType = BCRYPT_RSAFULLPRIVATE_BLOB;
rsakey->Magic = BCRYPT_RSAFULLPRIVATE_MAGIC;
rsakey->cbPrime1 = p1len;
rsakey->cbPrime2 = p2len;
}
else {
lpszBlobType = BCRYPT_RSAPUBLIC_BLOB;
rsakey->Magic = BCRYPT_RSAPUBLIC_MAGIC;
rsakey->cbPrime1 = 0;
rsakey->cbPrime2 = 0;
}
ret = BCryptImportKeyPair(_libssh2_wincng.hAlgRSA, NULL, lpszBlobType,
&hKey, key, keylen, 0);
if(!BCRYPT_SUCCESS(ret)) {
_libssh2_wincng_safe_free(key, keylen);
return -1;
}
*rsa = malloc(sizeof(libssh2_rsa_ctx));
if(!(*rsa)) {
BCryptDestroyKey(hKey);
_libssh2_wincng_safe_free(key, keylen);
return -1;
}
(*rsa)->hKey = hKey;
(*rsa)->pbKeyObject = key;
(*rsa)->cbKeyObject = keylen;
return 0;
}
#ifdef HAVE_LIBCRYPT32