encode.c

来自「一个类似windows」· C语言 代码 · 共 1,906 行 · 第 1/5 页

                {
                    SetLastError(ERROR_MORE_DATA);
                    ret = FALSE;
                }
                else
                {
                    for (i = 0; ret && i < rdn->cRDNAttr; i++)
                    {
                        blobs[i].pbData = CryptMemAlloc(blobs[i].cbData);
                        if (!blobs[i].pbData)
                            ret = FALSE;
                        else
                            ret = CRYPT_AsnEncodeRdnAttr(dwCertEncodingType,
                             &rdn->rgRDNAttr[i], blobs[i].pbData,
                             &blobs[i].cbData);
                    }
                    if (ret)
                    {
                        qsort(blobs, rdn->cRDNAttr, sizeof(CRYPT_DER_BLOB),
                         BLOBComp);
                        *pbEncoded++ = ASN_CONSTRUCTOR | ASN_SETOF;
                        CRYPT_EncodeLen(bytesNeeded - lenBytes - 1, pbEncoded,
                         &lenBytes);
                        pbEncoded += lenBytes;
                        for (i = 0; ret && i < rdn->cRDNAttr; i++)
                        {
                            memcpy(pbEncoded, blobs[i].pbData, blobs[i].cbData);
                            pbEncoded += blobs[i].cbData;
                        }
                    }
                }
            }
            *pcbEncoded = bytesNeeded;
        }
        if (blobs)
        {
            for (i = 0; i < rdn->cRDNAttr; i++)
                CryptMemFree(blobs[i].pbData);
        }
    }
    __EXCEPT_PAGE_FAULT
    {
        SetLastError(STATUS_ACCESS_VIOLATION);
        ret = FALSE;
    }
    __ENDTRY
    CryptMemFree(blobs);
    return ret;
}

static BOOL WINAPI CRYPT_AsnEncodeName(DWORD dwCertEncodingType,
 LPCSTR lpszStructType, const void *pvStructInfo, DWORD dwFlags,
 PCRYPT_ENCODE_PARA pEncodePara, BYTE *pbEncoded, DWORD *pcbEncoded)
{
    BOOL ret;

    __TRY
    {
        const CERT_NAME_INFO *info = (const CERT_NAME_INFO *)pvStructInfo;
        DWORD bytesNeeded = 0, lenBytes, size, i;

        TRACE("encoding name with %ld RDNs\n", info->cRDN);
        ret = TRUE;
        for (i = 0; ret && i < info->cRDN; i++)
        {
            ret = CRYPT_AsnEncodeRdn(dwCertEncodingType, &info->rgRDN[i], NULL,
             &size);
            if (ret)
                bytesNeeded += size;
        }
        CRYPT_EncodeLen(bytesNeeded, NULL, &lenBytes);
        bytesNeeded += 1 + lenBytes;
        if (ret)
        {
            if (!pbEncoded)
                *pcbEncoded = bytesNeeded;
            else
            {
                if ((ret = CRYPT_EncodeEnsureSpace(dwFlags, pEncodePara,
                 pbEncoded, pcbEncoded, bytesNeeded)))
                {
                    if (dwFlags & CRYPT_ENCODE_ALLOC_FLAG)
                        pbEncoded = *(BYTE **)pbEncoded;
                    *pbEncoded++ = ASN_SEQUENCEOF;
                    CRYPT_EncodeLen(bytesNeeded - lenBytes - 1, pbEncoded,
                     &lenBytes);
                    pbEncoded += lenBytes;
                    for (i = 0; ret && i < info->cRDN; i++)
                    {
                        size = bytesNeeded;
                        ret = CRYPT_AsnEncodeRdn(dwCertEncodingType,
                         &info->rgRDN[i], pbEncoded, &size);
                        if (ret)
                        {
                            pbEncoded += size;
                            bytesNeeded -= size;
                        }
                    }
                }
            }
        }
    }
    __EXCEPT_PAGE_FAULT
    {
        SetLastError(STATUS_ACCESS_VIOLATION);
        ret = FALSE;
    }
    __ENDTRY
    return ret;
}

static BOOL WINAPI CRYPT_AsnEncodeBool(DWORD dwCertEncodingType,
 LPCSTR lpszStructType, const void *pvStructInfo, DWORD dwFlags,
 PCRYPT_ENCODE_PARA pEncodePara, BYTE *pbEncoded, DWORD *pcbEncoded)
{
    BOOL val = *(const BOOL *)pvStructInfo, ret;

    TRACE("%d\n", val);

    if (!pbEncoded)
    {
        *pcbEncoded = 3;
        ret = TRUE;
    }
    else if (*pcbEncoded < 3)
    {
        *pcbEncoded = 3;
        SetLastError(ERROR_MORE_DATA);
        ret = FALSE;
    }
    else
    {
        *pcbEncoded = 3;
        *pbEncoded++ = ASN_BOOL;
        *pbEncoded++ = 1;
        *pbEncoded++ = val ? 0xff : 0;
        ret = TRUE;
    }
    TRACE("returning %d (%08lx)\n", ret, GetLastError());
    return ret;
}

static BOOL CRYPT_AsnEncodeAltNameEntry(const CERT_ALT_NAME_ENTRY *entry,
 BYTE *pbEncoded, DWORD *pcbEncoded)
{
    BOOL ret;
    DWORD dataLen;

    ret = TRUE;
    switch (entry->dwAltNameChoice)
    {
    case CERT_ALT_NAME_RFC822_NAME:
    case CERT_ALT_NAME_DNS_NAME:
    case CERT_ALT_NAME_URL:
        if (entry->u.pwszURL)
        {
            DWORD i;

            /* Not + 1: don't encode the NULL-terminator */
            dataLen = lstrlenW(entry->u.pwszURL);
            for (i = 0; ret && i < dataLen; i++)
            {
                if (entry->u.pwszURL[i] > 0x7f)
                {
                    SetLastError(CRYPT_E_INVALID_IA5_STRING);
                    ret = FALSE;
                    *pcbEncoded = i;
                }
            }
        }
        else
            dataLen = 0;
        break;
    case CERT_ALT_NAME_IP_ADDRESS:
        dataLen = entry->u.IPAddress.cbData;
        break;
    case CERT_ALT_NAME_REGISTERED_ID:
        /* FIXME: encode OID */
    case CERT_ALT_NAME_OTHER_NAME:
    case CERT_ALT_NAME_DIRECTORY_NAME:
        FIXME("name type %ld unimplemented\n", entry->dwAltNameChoice);
        return FALSE;
    default:
        SetLastError(HRESULT_FROM_WIN32(ERROR_INVALID_PARAMETER));
        return FALSE;
    }
    if (ret)
    {
        DWORD bytesNeeded, lenBytes;

        CRYPT_EncodeLen(dataLen, NULL, &lenBytes);
        bytesNeeded = 1 + dataLen + lenBytes;
        if (!pbEncoded)
            *pcbEncoded = bytesNeeded;
        else if (*pcbEncoded < bytesNeeded)
        {
            SetLastError(ERROR_MORE_DATA);
            *pcbEncoded = bytesNeeded;
            ret = FALSE;
        }
        else
        {
            *pbEncoded++ = ASN_CONTEXT | (entry->dwAltNameChoice - 1);
            CRYPT_EncodeLen(dataLen, pbEncoded, &lenBytes);
            pbEncoded += lenBytes;
            switch (entry->dwAltNameChoice)
            {
            case CERT_ALT_NAME_RFC822_NAME:
            case CERT_ALT_NAME_DNS_NAME:
            case CERT_ALT_NAME_URL:
            {
                DWORD i;

                for (i = 0; i < dataLen; i++)
                    *pbEncoded++ = (BYTE)entry->u.pwszURL[i];
                break;
            }
            case CERT_ALT_NAME_IP_ADDRESS:
                memcpy(pbEncoded, entry->u.IPAddress.pbData, dataLen);
                break;
            }
            if (ret)
                *pcbEncoded = bytesNeeded;
        }
    }
    TRACE("returning %d (%08lx)\n", ret, GetLastError());
    return ret;
}

static BOOL WINAPI CRYPT_AsnEncodeAltName(DWORD dwCertEncodingType,
 LPCSTR lpszStructType, const void *pvStructInfo, DWORD dwFlags,
 PCRYPT_ENCODE_PARA pEncodePara, BYTE *pbEncoded, DWORD *pcbEncoded)
{
    BOOL ret;

    __TRY
    {
        const CERT_ALT_NAME_INFO *info =
         (const CERT_ALT_NAME_INFO *)pvStructInfo;
        DWORD bytesNeeded, dataLen, lenBytes, i;

        ret = TRUE;
        /* FIXME: should check that cAltEntry is not bigger than 0xff, since we
         * can't encode an erroneous entry index if it's bigger than this.
         */
        for (i = 0, dataLen = 0; ret && i < info->cAltEntry; i++)
        {
            DWORD len;

            ret = CRYPT_AsnEncodeAltNameEntry(&info->rgAltEntry[i], NULL,
             &len);
            if (ret)
                dataLen += len;
            else if (GetLastError() == CRYPT_E_INVALID_IA5_STRING)
            {
                /* CRYPT_AsnEncodeAltNameEntry encoded the index of
                 * the bad character, now set the index of the bad
                 * entry
                 */
                *pcbEncoded = (BYTE)i <<
                 CERT_ALT_NAME_ENTRY_ERR_INDEX_SHIFT | len;
            }
        }
        if (ret)
        {
            CRYPT_EncodeLen(dataLen, NULL, &lenBytes);
            bytesNeeded = 1 + lenBytes + dataLen;
            if (!pbEncoded)
            {
                *pcbEncoded = bytesNeeded;
                ret = TRUE;
            }
            else
            {
                if ((ret = CRYPT_EncodeEnsureSpace(dwFlags, pEncodePara,
                 pbEncoded, pcbEncoded, bytesNeeded)))
                {
                    if (dwFlags & CRYPT_ENCODE_ALLOC_FLAG)
                        pbEncoded = *(BYTE **)pbEncoded;
                    *pbEncoded++ = ASN_SEQUENCEOF;
                    CRYPT_EncodeLen(dataLen, pbEncoded, &lenBytes);
                    pbEncoded += lenBytes;
                    for (i = 0; ret && i < info->cAltEntry; i++)
                    {
                        DWORD len = dataLen;

                        ret = CRYPT_AsnEncodeAltNameEntry(&info->rgAltEntry[i],
                         pbEncoded, &len);
                        if (ret)
                        {
                            pbEncoded += len;
                            dataLen -= len;
                        }
                    }
                }
            }
        }
    }
    __EXCEPT_PAGE_FAULT
    {
        SetLastError(STATUS_ACCESS_VIOLATION);
        ret = FALSE;
    }
    __ENDTRY
    return ret;
}

static BOOL WINAPI CRYPT_AsnEncodeBasicConstraints(DWORD dwCertEncodingType,
 LPCSTR lpszStructType, const void *pvStructInfo, DWORD dwFlags,
 PCRYPT_ENCODE_PARA pEncodePara, BYTE *pbEncoded, DWORD *pcbEncoded)
{
    BOOL ret;

    __TRY
    {
        const CERT_BASIC_CONSTRAINTS_INFO *info =
         (const CERT_BASIC_CONSTRAINTS_INFO *)pvStructInfo;
        struct AsnEncodeSequenceItem items[3] = {
         { &info->SubjectType, CRYPT_AsnEncodeBits, 0 },
         { 0 }
        };
        DWORD cItem = 1;

        if (info->fPathLenConstraint)
        {
            items[cItem].pvStructInfo = &info->dwPathLenConstraint;
            items[cItem].encodeFunc = CRYPT_AsnEncodeInt;
            cItem++;
        }
        if (info->cSubtreesConstraint)
        {
            items[cItem].pvStructInfo = &info->cSubtreesConstraint;
            items[cItem].encodeFunc = CRYPT_AsnEncodeSequenceOfAny;
            cItem++;
        }
        ret = CRYPT_AsnEncodeSequence(dwCertEncodingType, items, cItem,
         dwFlags, pEncodePara, pbEncoded, pcbEncoded);
    }
    __EXCEPT_PAGE_FAULT
    {
        SetLastError(STATUS_ACCESS_VIOLATION);
        ret = FALSE;
    }
    __ENDTRY
    return ret;
}

static BOOL WINAPI CRYPT_AsnEncodeBasicConstraints2(DWORD dwCertEncodingType,
 LPCSTR lpszStructType, const void *pvStructInfo, DWORD dwFlags,
 PCRYPT_ENCODE_PARA pEncodePara, BYTE *pbEncoded, DWORD *pcbEncoded)
{
    BOOL ret;

    __TRY
    {
        const CERT_BASIC_CONSTRAINTS2_INFO *info =
         (const CERT_BASIC_CONSTRAINTS2_INFO *)pvStructInfo;
        struct AsnEncodeSequenceItem items[2] = { { 0 } };
        DWORD cItem = 0;

        if (info->fCA)
        {
            items[cItem].pvStructInfo = &info->fCA;
            items[cItem].encodeFunc = CRYPT_AsnEncodeBool;
            cItem++;
        }
        if (info->fPathLenConstraint)
        {
            items[cItem].pvStructInfo = &info->dwPathLenConstraint;
            items[cItem].encodeFunc = CRYPT_AsnEncodeInt;
            cItem++;
        }
        ret = CRYPT_AsnEncodeSequence(dwCertEncodingType, items, cItem,
         dwFlags, pEncodePara, pbEncoded, pcbEncoded);
    }
    __EXCEPT_PAGE_FAULT
    {
        SetLastError(STATUS_ACCESS_VIOLATION);
        ret = FALSE;
    }
    __ENDTRY
    return ret;