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crypt32: Implement streamed encoding of definite-length data messages.

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This commit is contained in:
Juan Lang 2007-07-12 14:20:20 -07:00 committed by Alexandre Julliard
parent 48afa16386
commit afaba37ed7
2 changed files with 160 additions and 19 deletions
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154
dlls/crypt32/msg.c
View file

@ -19,8 +19,11 @@
#include "windef.h"
#include "winbase.h"
#include "wincrypt.h"
#include "snmp.h"
#include "wine/debug.h"
#include "wine/exception.h"
#include "crypt32_private.h"
WINE_DEFAULT_DEBUG_CHANNEL(crypt);
@ -74,6 +77,7 @@ typedef struct _CDataEncodeMsg
CryptMsgBase base;
DWORD bare_content_len;
LPBYTE bare_content;
BOOL begun;
} CDataEncodeMsg;
static const BYTE empty_data_content[] = { 0x04,0x00 };
@ -86,6 +90,71 @@ static void CDataEncodeMsg_Close(HCRYPTMSG hCryptMsg)
LocalFree(msg->bare_content);
}
static WINAPI BOOL CRYPT_EncodeContentLength(DWORD dwCertEncodingType,
LPCSTR lpszStructType, const void *pvStructInfo, DWORD dwFlags,
PCRYPT_ENCODE_PARA pEncodePara, BYTE *pbEncoded, DWORD *pcbEncoded)
{
const CDataEncodeMsg *msg = (const CDataEncodeMsg *)pvStructInfo;
DWORD lenBytes;
BOOL ret = TRUE;
/* Trick: report bytes needed based on total message length, even though
* the message isn't available yet. The caller will use the length
* reported here to encode its length.
*/
CRYPT_EncodeLen(msg->base.stream_info.cbContent, NULL, &lenBytes);
if (!pbEncoded)
*pcbEncoded = 1 + lenBytes + msg->base.stream_info.cbContent;
else
{
if ((ret = CRYPT_EncodeEnsureSpace(dwFlags, pEncodePara, pbEncoded,
pcbEncoded, 1 + lenBytes)))
{
if (dwFlags & CRYPT_ENCODE_ALLOC_FLAG)
pbEncoded = *(BYTE **)pbEncoded;
*pbEncoded++ = ASN_OCTETSTRING;
CRYPT_EncodeLen(msg->base.stream_info.cbContent, pbEncoded,
&lenBytes);
}
}
return ret;
}
static BOOL CRYPT_EncodeDataContentInfoHeader(CDataEncodeMsg *msg,
CRYPT_DATA_BLOB *header)
{
BOOL ret;
if (msg->base.streamed && msg->base.stream_info.cbContent == 0xffffffff)
{
FIXME("unimplemented for indefinite-length encoding\n");
header->cbData = 0;
header->pbData = NULL;
ret = TRUE;
}
else
{
struct AsnConstructedItem constructed = { 0, msg,
CRYPT_EncodeContentLength };
struct AsnEncodeSequenceItem items[2] = {
{ szOID_RSA_data, CRYPT_AsnEncodeOid, 0 },
{ &constructed, CRYPT_AsnEncodeConstructed, 0 },
};
ret = CRYPT_AsnEncodeSequence(X509_ASN_ENCODING, items,
sizeof(items) / sizeof(items[0]), CRYPT_ENCODE_ALLOC_FLAG, NULL,
(LPBYTE)&header->pbData, &header->cbData);
if (ret)
{
/* Trick: subtract the content length from the reported length,
* as the actual content hasn't come yet.
*/
header->cbData -= msg->base.stream_info.cbContent;
}
}
return ret;
}
static BOOL CDataEncodeMsg_Update(HCRYPTMSG hCryptMsg, const BYTE *pbData,
DWORD cbData, BOOL fFinal)
{
@ -94,30 +163,80 @@ static BOOL CDataEncodeMsg_Update(HCRYPTMSG hCryptMsg, const BYTE *pbData,
if (msg->base.finalized)
SetLastError(CRYPT_E_MSG_ERROR);
else if (!fFinal)
else if (msg->base.streamed)
{
if (msg->base.open_flags & CMSG_DETACHED_FLAG)
SetLastError(E_INVALIDARG);
else
SetLastError(CRYPT_E_MSG_ERROR);
if (fFinal)
msg->base.finalized = TRUE;
__TRY
{
if (!msg->begun)
{
CRYPT_DATA_BLOB header;
msg->begun = TRUE;
ret = CRYPT_EncodeDataContentInfoHeader(msg, &header);
if (ret)
{
ret = msg->base.stream_info.pfnStreamOutput(
msg->base.stream_info.pvArg, header.pbData, header.cbData,
FALSE);
LocalFree(header.pbData);
}
}
if (!fFinal)
ret = msg->base.stream_info.pfnStreamOutput(
msg->base.stream_info.pvArg, (BYTE *)pbData, cbData,
FALSE);
else
{
if (msg->base.stream_info.cbContent == 0xffffffff)
{
BYTE indefinite_trailer[6] = { 0 };
ret = msg->base.stream_info.pfnStreamOutput(
msg->base.stream_info.pvArg, (BYTE *)pbData, cbData,
FALSE);
if (ret)
ret = msg->base.stream_info.pfnStreamOutput(
msg->base.stream_info.pvArg, indefinite_trailer,
sizeof(indefinite_trailer), TRUE);
}
else
ret = msg->base.stream_info.pfnStreamOutput(
msg->base.stream_info.pvArg, (BYTE *)pbData, cbData, TRUE);
}
}
__EXCEPT_PAGE_FAULT
{
SetLastError(STATUS_ACCESS_VIOLATION);
}
__ENDTRY;
}
else
{
msg->base.finalized = TRUE;
if (!cbData)
SetLastError(E_INVALIDARG);
if (!fFinal)
{
if (msg->base.open_flags & CMSG_DETACHED_FLAG)
SetLastError(E_INVALIDARG);
else
SetLastError(CRYPT_E_MSG_ERROR);
}
else
{
CRYPT_DATA_BLOB blob = { cbData, (LPBYTE)pbData };
msg->base.finalized = TRUE;
if (!cbData)
SetLastError(E_INVALIDARG);
else
{
CRYPT_DATA_BLOB blob = { cbData, (LPBYTE)pbData };
/* data messages don't allow non-final updates, don't bother
* checking whether data already exist, they can't.
*/
ret = CryptEncodeObjectEx(X509_ASN_ENCODING, X509_OCTET_STRING,
&blob, CRYPT_ENCODE_ALLOC_FLAG, NULL, &msg->bare_content,
&msg->bare_content_len);
if (ret && msg->base.streamed)
FIXME("stream info unimplemented\n");
/* non-streamed data messages don't allow non-final updates,
* don't bother checking whether data already exist, they can't.
*/
ret = CryptEncodeObjectEx(X509_ASN_ENCODING, X509_OCTET_STRING,
&blob, CRYPT_ENCODE_ALLOC_FLAG, NULL, &msg->bare_content,
&msg->bare_content_len);
}
}
}
return ret;
@ -189,6 +308,7 @@ static HCRYPTMSG CDataEncodeMsg_Open(DWORD dwFlags, const void *pvMsgEncodeInfo,
CDataEncodeMsg_Close, CDataEncodeMsg_GetParam, CDataEncodeMsg_Update);
msg->bare_content_len = sizeof(empty_data_content);
msg->bare_content = (LPBYTE)empty_data_content;
msg->begun = FALSE;
}
return (HCRYPTMSG)msg;
}

25
dlls/crypt32/tests/msg.c
View file

@ -336,6 +336,7 @@ static void test_data_msg_update(void)
{
HCRYPTMSG msg;
BOOL ret;
CMSG_STREAM_INFO streamInfo = { 0 };
msg = CryptMsgOpenToEncode(PKCS_7_ASN_ENCODING, 0, CMSG_DATA, NULL, NULL,
NULL);
@ -383,6 +384,28 @@ static void test_data_msg_update(void)
ret = CryptMsgUpdate(msg, msgData, sizeof(msgData), TRUE);
ok(ret, "CryptMsgUpdate failed: %x\n", GetLastError());
CryptMsgClose(msg);
/* Calling update after opening with an empty stream info (with a bogus
* output function) yields an error:
*/
msg = CryptMsgOpenToEncode(PKCS_7_ASN_ENCODING, 0, CMSG_DATA, NULL, NULL,
&streamInfo);
SetLastError(0xdeadbeef);
ret = CryptMsgUpdate(msg, msgData, sizeof(msgData), FALSE);
ok(!ret && GetLastError() == STATUS_ACCESS_VIOLATION,
"Expected STATUS_ACCESS_VIOLATION, got %x\n", GetLastError());
CryptMsgClose(msg);
/* Calling update with a valid output function succeeds, even if the data
* exceeds the size specified in the stream info.
*/
streamInfo.pfnStreamOutput = nop_stream_output;
msg = CryptMsgOpenToEncode(PKCS_7_ASN_ENCODING, 0, CMSG_DATA, NULL, NULL,
&streamInfo);
ret = CryptMsgUpdate(msg, msgData, sizeof(msgData), FALSE);
ok(ret, "CryptMsgUpdate failed: %x\n", GetLastError());
ret = CryptMsgUpdate(msg, msgData, sizeof(msgData), TRUE);
ok(ret, "CryptMsgUpdate failed: %x\n", GetLastError());
CryptMsgClose(msg);
}
static void test_data_msg_get_param(void)
@ -600,7 +623,6 @@ static void test_data_msg_encoding(void)
CryptMsgUpdate(msg, msgData, sizeof(msgData), FALSE);
CryptMsgUpdate(msg, msgData, sizeof(msgData), TRUE);
CryptMsgClose(msg);
todo_wine
check_updates("bogus data message with definite length", &a1, &accum);
free_updates(&accum);
/* A valid definite-length encoding: */
@ -609,7 +631,6 @@ static void test_data_msg_encoding(void)
NULL, &streamInfo);
CryptMsgUpdate(msg, msgData, sizeof(msgData), TRUE);
CryptMsgClose(msg);
todo_wine
check_updates("data message with definite length", &a2, &accum);
free_updates(&accum);
/* An indefinite-length encoding: */