decode.c

这是一个开放源代码的与WINNT/WIN2K/WIN2003兼容的操作系统

                {
                case ASN_OCTETSTRING:
                case ASN_NUMERICSTRING:
                case ASN_PRINTABLESTRING:
                case ASN_IA5STRING:
                case ASN_T61STRING:
                case ASN_VIDEOTEXSTRING:
                case ASN_GRAPHICSTRING:
                case ASN_VISIBLESTRING:
                case ASN_GENERALSTRING:
                    value->Value.cbData = dataLen;
                    if (dataLen)
                    {
                        if (!(dwFlags & CRYPT_DECODE_NOCOPY_FLAG))
                            memcpy(value->Value.pbData,
                             pbEncoded + 1 + lenBytes, dataLen);
                        else
                            value->Value.pbData = (LPBYTE)pbEncoded + 1 +
                             lenBytes;
                    }
                    break;
                case ASN_BMPSTRING:
                {
                    LPWSTR str = (LPWSTR)value->Value.pbData;

                    value->Value.cbData = dataLen;
                    for (i = 0; i < dataLen / 2; i++)
                        str[i] = (pbEncoded[1 + lenBytes + 2 * i] << 8) |
                         pbEncoded[1 + lenBytes + 2 * i + 1];
                    break;
                }
                case ASN_UTF8STRING:
                {
                    LPWSTR str = (LPWSTR)value->Value.pbData;

                    value->Value.cbData = MultiByteToWideChar(CP_UTF8, 0,
                     (LPCSTR)pbEncoded + 1 + lenBytes, dataLen, 
                     str, bytesNeeded - sizeof(CERT_NAME_VALUE)) * 2;
                    break;
                }
                }
            }
            else
            {
                value->Value.cbData = 0;
                value->Value.pbData = NULL;
            }
        }
    }
    return ret;
}

static BOOL WINAPI CRYPT_AsnDecodeNameValue(DWORD dwCertEncodingType,
 LPCSTR lpszStructType, const BYTE *pbEncoded, DWORD cbEncoded, DWORD dwFlags,
 PCRYPT_DECODE_PARA pDecodePara, void *pvStructInfo, DWORD *pcbStructInfo)
{
    BOOL ret = TRUE;

    __TRY
    {
        ret = CRYPT_AsnDecodeNameValueInternal(dwCertEncodingType,
         lpszStructType, pbEncoded, cbEncoded,
         dwFlags & ~CRYPT_DECODE_ALLOC_FLAG, NULL, NULL, pcbStructInfo);
        if (ret && pvStructInfo)
        {
            ret = CRYPT_DecodeEnsureSpace(dwFlags, pDecodePara, pvStructInfo,
             pcbStructInfo, *pcbStructInfo);
            if (ret)
            {
                CERT_NAME_VALUE *value;

                if (dwFlags & CRYPT_DECODE_ALLOC_FLAG)
                    pvStructInfo = *(BYTE **)pvStructInfo;
                value = (CERT_NAME_VALUE *)pvStructInfo;
                value->Value.pbData = ((BYTE *)value + sizeof(CERT_NAME_VALUE));
                ret = CRYPT_AsnDecodeNameValueInternal(dwCertEncodingType,
                 lpszStructType, pbEncoded, cbEncoded,
                 dwFlags & ~CRYPT_DECODE_ALLOC_FLAG, NULL, pvStructInfo,
                 pcbStructInfo);
            }
        }
    }
    __EXCEPT_PAGE_FAULT
    {
        SetLastError(STATUS_ACCESS_VIOLATION);
        ret = FALSE;
    }
    __ENDTRY
    return ret;
}

static BOOL WINAPI CRYPT_AsnDecodeUnicodeNameValueInternal(
 DWORD dwCertEncodingType, LPCSTR lpszStructType, const BYTE *pbEncoded,
 DWORD cbEncoded, DWORD dwFlags, PCRYPT_DECODE_PARA pDecodePara,
 void *pvStructInfo, DWORD *pcbStructInfo)
{
    BOOL ret = TRUE;
    DWORD dataLen;
    CERT_NAME_VALUE *value = (CERT_NAME_VALUE *)pvStructInfo;

    if ((ret = CRYPT_GetLen(pbEncoded, cbEncoded, &dataLen)))
    {
        BYTE lenBytes = GET_LEN_BYTES(pbEncoded[1]);
        DWORD bytesNeeded = sizeof(CERT_NAME_VALUE), valueType;

        switch (pbEncoded[0])
        {
        case ASN_NUMERICSTRING:
            valueType = CERT_RDN_NUMERIC_STRING;
            bytesNeeded += dataLen * 2;
            break;
        case ASN_PRINTABLESTRING:
            valueType = CERT_RDN_PRINTABLE_STRING;
            bytesNeeded += dataLen * 2;
            break;
        case ASN_IA5STRING:
            valueType = CERT_RDN_IA5_STRING;
            bytesNeeded += dataLen * 2;
            break;
        case ASN_T61STRING:
            valueType = CERT_RDN_T61_STRING;
            bytesNeeded += dataLen * 2;
            break;
        case ASN_VIDEOTEXSTRING:
            valueType = CERT_RDN_VIDEOTEX_STRING;
            bytesNeeded += dataLen * 2;
            break;
        case ASN_GRAPHICSTRING:
            valueType = CERT_RDN_GRAPHIC_STRING;
            bytesNeeded += dataLen * 2;
            break;
        case ASN_VISIBLESTRING:
            valueType = CERT_RDN_VISIBLE_STRING;
            bytesNeeded += dataLen * 2;
            break;
        case ASN_GENERALSTRING:
            valueType = CERT_RDN_GENERAL_STRING;
            bytesNeeded += dataLen * 2;
            break;
        case ASN_UNIVERSALSTRING:
            valueType = CERT_RDN_UNIVERSAL_STRING;
            bytesNeeded += dataLen / 2;
            break;
        case ASN_BMPSTRING:
            valueType = CERT_RDN_BMP_STRING;
            bytesNeeded += dataLen;
            break;
        case ASN_UTF8STRING:
            valueType = CERT_RDN_UTF8_STRING;
            bytesNeeded += MultiByteToWideChar(CP_UTF8, 0,
             (LPCSTR)pbEncoded + 1 + lenBytes, dataLen, NULL, 0) * 2;
            break;
        default:
            SetLastError(CRYPT_E_ASN1_BADTAG);
            return FALSE;
        }

        if (!value)
            *pcbStructInfo = bytesNeeded;
        else if (*pcbStructInfo < bytesNeeded)
        {
            *pcbStructInfo = bytesNeeded;
            SetLastError(ERROR_MORE_DATA);
            ret = FALSE;
        }
        else
        {
            *pcbStructInfo = bytesNeeded;
            value->dwValueType = valueType;
            if (dataLen)
            {
                DWORD i;
                LPWSTR str = (LPWSTR)value->Value.pbData;

                assert(value->Value.pbData);
                switch (pbEncoded[0])
                {
                case ASN_NUMERICSTRING:
                case ASN_PRINTABLESTRING:
                case ASN_IA5STRING:
                case ASN_T61STRING:
                case ASN_VIDEOTEXSTRING:
                case ASN_GRAPHICSTRING:
                case ASN_VISIBLESTRING:
                case ASN_GENERALSTRING:
                    value->Value.cbData = dataLen * 2;
                    for (i = 0; i < dataLen; i++)
                        str[i] = pbEncoded[1 + lenBytes + i];
                    break;
                case ASN_UNIVERSALSTRING:
                    value->Value.cbData = dataLen / 2;
                    for (i = 0; i < dataLen / 4; i++)
                        str[i] = (pbEncoded[1 + lenBytes + 2 * i + 2] << 8)
                         | pbEncoded[1 + lenBytes + 2 * i + 3];
                    break;
                case ASN_BMPSTRING:
                    value->Value.cbData = dataLen;
                    for (i = 0; i < dataLen / 2; i++)
                        str[i] = (pbEncoded[1 + lenBytes + 2 * i] << 8) |
                         pbEncoded[1 + lenBytes + 2 * i + 1];
                    break;
                case ASN_UTF8STRING:
                    value->Value.cbData = MultiByteToWideChar(CP_UTF8, 0,
                     (LPCSTR)pbEncoded + 1 + lenBytes, dataLen,
                     str, bytesNeeded - sizeof(CERT_NAME_VALUE)) * 2;
                    break;
                }
            }
            else
            {
                value->Value.cbData = 0;
                value->Value.pbData = NULL;
            }
        }
    }
    return ret;
}

static BOOL WINAPI CRYPT_AsnDecodeUnicodeNameValue(DWORD dwCertEncodingType,
 LPCSTR lpszStructType, const BYTE *pbEncoded, DWORD cbEncoded, DWORD dwFlags,
 PCRYPT_DECODE_PARA pDecodePara, void *pvStructInfo, DWORD *pcbStructInfo)
{
    BOOL ret = TRUE;

    __TRY
    {
        ret = CRYPT_AsnDecodeUnicodeNameValueInternal(dwCertEncodingType,
         lpszStructType, pbEncoded, cbEncoded,
         dwFlags & ~CRYPT_DECODE_ALLOC_FLAG, NULL, NULL, pcbStructInfo);
        if (ret && pvStructInfo)
        {
            ret = CRYPT_DecodeEnsureSpace(dwFlags, pDecodePara, pvStructInfo,
             pcbStructInfo, *pcbStructInfo);
            if (ret)
            {
                CERT_NAME_VALUE *value;

                if (dwFlags & CRYPT_DECODE_ALLOC_FLAG)
                    pvStructInfo = *(BYTE **)pvStructInfo;
                value = (CERT_NAME_VALUE *)pvStructInfo;
                value->Value.pbData = ((BYTE *)value + sizeof(CERT_NAME_VALUE));
                ret = CRYPT_AsnDecodeUnicodeNameValueInternal(
                 dwCertEncodingType, lpszStructType, pbEncoded, cbEncoded,
                 dwFlags & ~CRYPT_DECODE_ALLOC_FLAG, NULL, pvStructInfo,
                 pcbStructInfo);
            }
        }
    }
    __EXCEPT_PAGE_FAULT
    {
        SetLastError(STATUS_ACCESS_VIOLATION);
        ret = FALSE;
    }
    __ENDTRY
    return ret;
}

static BOOL WINAPI CRYPT_AsnDecodeRdnAttr(DWORD dwCertEncodingType,
 LPCSTR lpszStructType, const BYTE *pbEncoded, DWORD cbEncoded, DWORD dwFlags,
 PCRYPT_DECODE_PARA pDecodePara, void *pvStructInfo, DWORD *pcbStructInfo)
{
    BOOL ret;
    struct AsnDecodeSequenceItem items[] = {
     { ASN_OBJECTIDENTIFIER, offsetof(CERT_RDN_ATTR, pszObjId),
       CRYPT_AsnDecodeOidInternal, sizeof(LPSTR), FALSE, TRUE,
       offsetof(CERT_RDN_ATTR, pszObjId), 0 },
     { 0, offsetof(CERT_RDN_ATTR, dwValueType),
       CRYPT_AsnDecodeNameValueInternal, sizeof(CERT_NAME_VALUE),
       FALSE, TRUE, offsetof(CERT_RDN_ATTR, Value.pbData), 0 },
    };
    CERT_RDN_ATTR *attr = (CERT_RDN_ATTR *)pvStructInfo;

    TRACE("%p, %d, %08x, %p, %d\n", pbEncoded, cbEncoded, dwFlags,
     pvStructInfo, *pcbStructInfo);

    if (attr)
        TRACE("attr->pszObjId is %p\n", attr->pszObjId);
    ret = CRYPT_AsnDecodeSequence(X509_ASN_ENCODING, items,
     sizeof(items) / sizeof(items[0]), pbEncoded, cbEncoded, dwFlags, NULL,
     attr, pcbStructInfo, attr ? attr->pszObjId : NULL);
    if (attr)
    {
        TRACE("attr->pszObjId is %p (%s)\n", attr->pszObjId,
         debugstr_a(attr->pszObjId));
        TRACE("attr->dwValueType is %d\n", attr->dwValueType);
    }
    TRACE("returning %d (%08x)\n", ret, GetLastError());
    return ret;
}

static BOOL WINAPI CRYPT_AsnDecodeRdn(DWORD dwCertEncodingType,
 LPCSTR lpszStructType, const BYTE *pbEncoded, DWORD cbEncoded, DWORD dwFlags,
 PCRYPT_DECODE_PARA pDecodePara, void *pvStructInfo, DWORD *pcbStructInfo)
{
    BOOL ret = TRUE;
    struct AsnArrayDescriptor arrayDesc = { ASN_CONSTRUCTOR | ASN_SETOF,
     CRYPT_AsnDecodeRdnAttr, sizeof(CERT_RDN_ATTR), TRUE,
     offsetof(CERT_RDN_ATTR, pszObjId) };
    PCERT_RDN rdn = (PCERT_RDN)pvStructInfo;

    ret = CRYPT_AsnDecodeArray(&arrayDesc, pbEncoded, cbEncoded, dwFlags,
     pDecodePara, pvStructInfo, pcbStructInfo, rdn ? rdn->rgRDNAttr : NULL);
    return ret;
}

static BOOL WINAPI CRYPT_AsnDecodeName(DWORD dwCertEncodingType,
 LPCSTR lpszStructType, const BYTE *pbEncoded, DWORD cbEncoded, DWORD dwFlags,
 PCRYPT_DECODE_PARA pDecodePara, void *pvStructInfo, DWORD *pcbStructInfo)
{
    BOOL ret = TRUE;

    __TRY
    {
        struct AsnArrayDescriptor arrayDesc = { ASN_SEQUENCEOF,
         CRYPT_AsnDecodeRdn, sizeof(CERT_RDN), TRUE,
         offsetof(CERT_RDN, rgRDNAttr) };

        ret = CRYPT_AsnDecodeArray(&arrayDesc, pbEncoded, cbEncoded, dwFlags,
         pDecodePara, pvStructInfo, pcbStructInfo, NULL);
    }
    __EXCEPT_PAGE_FAULT
    {
        SetLastError(STATUS_ACCESS_VIOLATION);
        ret = FALSE;
    }
    __ENDTRY
    return ret;
}

static BOOL WINAPI CRYPT_AsnDecodeUnicodeRdnAttr(DWORD dwCertEncodingType,
 LPCSTR lpszStructType, const BYTE *pbEncoded, DWORD cbEncoded, DWORD dwFlags,
 PCRYPT_DECODE_PARA pDecodePara, void *pvStructInfo, DWORD *pcbStructInfo)
{
    BOOL ret;
    struct AsnDecodeSequenceItem items[] = {
     { ASN_OBJECTIDENTIFIER, offsetof(CERT_RDN_ATTR, pszObjId),
       CRYPT_AsnDecodeOidInternal, sizeof(LPSTR), FALSE, TRUE,
       offsetof(CERT_RDN_ATTR, pszObjId), 0 },
     { 0, offsetof(CERT_RDN_A