encode.c

这是一个开放源代码的与WINNT/WIN2K/WIN2003兼容的操作系统

                        pbEncoded += size;
                        size = bytesNeeded - 1 - lenBytes - size;
                        ret = nameValueEncodeFunc(dwCertEncodingType,
                         NULL, (CERT_NAME_VALUE *)&attr->dwValueType,
                         0, NULL, pbEncoded, &size);
                        if (!ret)
                            *pcbEncoded = size;
                    }
                }
            }
            if (ret)
                *pcbEncoded = bytesNeeded;
        }
        else
        {
            /* Have to propagate index of failing character */
            *pcbEncoded = size;
        }
    }
    return ret;
}

static int BLOBComp(const void *l, const void *r)
{
    const CRYPT_DER_BLOB *a = (const CRYPT_DER_BLOB *)l, *b = (const CRYPT_DER_BLOB *)r;
    int ret;

    if (!(ret = memcmp(a->pbData, b->pbData, min(a->cbData, b->cbData))))
        ret = a->cbData - b->cbData;
    return ret;
}

/* This encodes as a SET OF, which in DER must be lexicographically sorted.
 */
static BOOL WINAPI CRYPT_AsnEncodeRdn(DWORD dwCertEncodingType, CERT_RDN *rdn,
 CryptEncodeObjectExFunc nameValueEncodeFunc, BYTE *pbEncoded,
 DWORD *pcbEncoded)
{
    BOOL ret;
    CRYPT_DER_BLOB *blobs = NULL;

    __TRY
    {
        DWORD bytesNeeded = 0, lenBytes, i;

        blobs = NULL;
        ret = TRUE;
        if (rdn->cRDNAttr)
        {
            blobs = CryptMemAlloc(rdn->cRDNAttr * sizeof(CRYPT_DER_BLOB));
            if (!blobs)
                ret = FALSE;
            else
                memset(blobs, 0, rdn->cRDNAttr * sizeof(CRYPT_DER_BLOB));
        }
        for (i = 0; ret && i < rdn->cRDNAttr; i++)
        {
            ret = CRYPT_AsnEncodeRdnAttr(dwCertEncodingType, &rdn->rgRDNAttr[i],
             nameValueEncodeFunc, NULL, &blobs[i].cbData);
            if (ret)
                bytesNeeded += blobs[i].cbData;
            else
            {
                /* Have to propagate index of failing character */
                *pcbEncoded = blobs[i].cbData;
            }
        }
        if (ret)
        {
            CRYPT_EncodeLen(bytesNeeded, NULL, &lenBytes);
            bytesNeeded += 1 + lenBytes;
            if (pbEncoded)
            {
                if (*pcbEncoded < bytesNeeded)
                {
                    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], nameValueEncodeFunc,
                             blobs[i].pbData, &blobs[i].cbData);
                            if (!ret)
                                *pcbEncoded = 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;
                        }
                    }
                }
            }
            if (ret)
                *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_AsnEncodeUnicodeNameValue(DWORD dwCertEncodingType,
 LPCSTR lpszStructType, const void *pvStructInfo, DWORD dwFlags,
 PCRYPT_ENCODE_PARA pEncodePara, BYTE *pbEncoded, DWORD *pcbEncoded);

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

    if (value->dwValueType == CERT_RDN_ENCODED_BLOB)
        ret = CRYPT_CopyEncodedBlob(dwCertEncodingType, NULL, &value->Value,
         dwFlags, pEncodePara, pbEncoded, pcbEncoded);
    else
        ret = CRYPT_AsnEncodeUnicodeNameValue(dwCertEncodingType, NULL, value,
         dwFlags, pEncodePara, pbEncoded, pcbEncoded);
    return ret;
}

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

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

        TRACE("encoding name with %d RDNs\n", info->cRDN);
        ret = TRUE;
        for (i = 0; ret && i < info->cRDN; i++)
        {
            ret = CRYPT_AsnEncodeRdn(dwCertEncodingType, &info->rgRDN[i],
             CRYPT_AsnEncodeOrCopyUnicodeNameValue, NULL, &size);
            if (ret)
                bytesNeeded += size;
            else
                *pcbEncoded = 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], CRYPT_AsnEncodeOrCopyUnicodeNameValue,
                         pbEncoded, &size);
                        if (ret)
                        {
                            pbEncoded += size;
                            bytesNeeded -= size;
                        }
                        else
                            *pcbEncoded = size;
                    }
                }
            }
        }
    }
    __EXCEPT_PAGE_FAULT
    {
        SetLastError(STATUS_ACCESS_VIOLATION);
        ret = FALSE;
    }
    __ENDTRY
    return ret;
}

static BOOL CRYPT_AsnEncodeUnicodeStringCoerce(const CERT_NAME_VALUE *value,
 BYTE tag, DWORD dwFlags, PCRYPT_ENCODE_PARA pEncodePara, BYTE *pbEncoded,
 DWORD *pcbEncoded)
{
    BOOL ret = TRUE;
    LPCWSTR str = (LPCWSTR)value->Value.pbData;
    DWORD bytesNeeded, lenBytes, encodedLen;

    encodedLen = value->Value.cbData ? value->Value.cbData / sizeof(WCHAR) :
     lstrlenW(str);
    CRYPT_EncodeLen(encodedLen, NULL, &lenBytes);
    bytesNeeded = 1 + lenBytes + encodedLen;
    if (!pbEncoded)
        *pcbEncoded = bytesNeeded;
    else
    {
        if ((ret = CRYPT_EncodeEnsureSpace(dwFlags, pEncodePara,
         pbEncoded, pcbEncoded, bytesNeeded)))
        {
            DWORD i;

            if (dwFlags & CRYPT_ENCODE_ALLOC_FLAG)
                pbEncoded = *(BYTE **)pbEncoded;
            *pbEncoded++ = tag;
            CRYPT_EncodeLen(encodedLen, pbEncoded, &lenBytes);
            pbEncoded += lenBytes;
            for (i = 0; i < encodedLen; i++)
                *pbEncoded++ = (BYTE)str[i];
        }
    }
    return ret;
}

static BOOL CRYPT_AsnEncodeNumericString(const CERT_NAME_VALUE *value,
 DWORD dwFlags, PCRYPT_ENCODE_PARA pEncodePara, BYTE *pbEncoded,
 DWORD *pcbEncoded)
{
    BOOL ret = TRUE;
    LPCWSTR str = (LPCWSTR)value->Value.pbData;
    DWORD bytesNeeded, lenBytes, encodedLen;

    encodedLen = value->Value.cbData ? value->Value.cbData / sizeof(WCHAR) :
     lstrlenW(str);
    CRYPT_EncodeLen(encodedLen, NULL, &lenBytes);
    bytesNeeded = 1 + lenBytes + encodedLen;
    if (!pbEncoded)
        *pcbEncoded = bytesNeeded;
    else
    {
        if ((ret = CRYPT_EncodeEnsureSpace(dwFlags, pEncodePara,
         pbEncoded, pcbEncoded, bytesNeeded)))
        {
            DWORD i;

            if (dwFlags & CRYPT_ENCODE_ALLOC_FLAG)
                pbEncoded = *(BYTE **)pbEncoded;
            *pbEncoded++ = ASN_NUMERICSTRING;
            CRYPT_EncodeLen(encodedLen, pbEncoded, &lenBytes);
            pbEncoded += lenBytes;
            for (i = 0; ret && i < encodedLen; i++)
            {
                if (isdigitW(str[i]))
                    *pbEncoded++ = (BYTE)str[i];
                else
                {
                    *pcbEncoded = i;
                    SetLastError(CRYPT_E_INVALID_NUMERIC_STRING);
                    ret = FALSE;
                }
            }
        }
    }
    return ret;
}

static inline int isprintableW(WCHAR wc)
{
    return isalnumW(wc) || isspaceW(wc) || wc == '\'' || wc == '(' ||
     wc == ')' || wc == '+' || wc == ',' || wc == '-' || wc == '.' ||
     wc == '/' || wc == ':' || wc == '=' || wc == '?';
}

static BOOL CRYPT_AsnEncodePrintableString(const CERT_NAME_VALUE *value,
 DWORD dwFlags, PCRYPT_ENCODE_PARA pEncodePara, BYTE *pbEncoded,
 DWORD *pcbEncoded)
{
    BOOL ret = TRUE;
    LPCWSTR str = (LPCWSTR)value->Value.pbData;
    DWORD bytesNeeded, lenBytes, encodedLen;

    encodedLen = value->Value.cbData ? value->Value.cbData / sizeof(WCHAR) :
     lstrlenW(str);
    CRYPT_EncodeLen(encodedLen, NULL, &lenBytes);
    bytesNeeded = 1 + lenBytes + encodedLen;
    if (!pbEncoded)
        *pcbEncoded = bytesNeeded;
    else
    {
        if ((ret = CRYPT_EncodeEnsureSpace(dwFlags, pEncodePara,
         pbEncoded, pcbEncoded, bytesNeeded)))
        {
            DWORD i;

            if (dwFlags & CRYPT_ENCODE_ALLOC_FLAG)
                pbEncoded = *(BYTE **)pbEncoded;
            *pbEncoded++ = ASN_PRINTABLESTRING;
            CRYPT_EncodeLen(encodedLen, pbEncoded, &lenBytes);
            pbEncoded += lenBytes;
            for (i = 0; ret && i < encodedLen; i++)
            {
                if (isprintableW(str[i]))
                    *pbEncoded++ = (BYTE)str[i];
                else
                {
                    *pcbEncoded = i;
                    SetLastError(CRYPT_E_INVALID_PRINTABLE_STRING);
                    ret = FALSE;
                }
            }
        }
    }
    return ret;
}

static BOOL CRYPT_AsnEncodeIA5String(const CERT_NAME_VALUE *value,
 DWORD dwFlags, PCRYPT_ENCODE_PARA pEncodePara, BYTE *pbEncoded,
 DWORD *pcbEncoded)
{
    BOOL ret = TRUE;
    LPCWSTR str = (LPCWSTR)value->Value.pbData;
    DWORD bytesNeeded, lenBytes, encodedLen;

    encodedLen = value->Value.cbData ? value->Value.cbData / sizeof(WCHAR) :
     lstrlenW(str);
    CRYPT_EncodeLen(encodedLen, NULL, &lenBytes);
    bytesNeeded = 1 + lenBytes + encodedLen;
    if (!pbEncoded)
        *pcbEncoded = bytesNeeded;
    else
    {
        if ((ret = CRYPT_EncodeEnsureSpace(dwFlags, pEncodePara,
         pbEncoded, pcbEncoded, bytesNeeded)))
        {
            DWORD i;

            if (dwFlags & CRYPT_ENCODE_ALLOC_FLAG)
                pbEncoded = *(BYTE **)pbEncoded;
            *pbEncoded++ = ASN_IA5STRING;
            CRYPT_EncodeLen(encodedLen, pbEncoded, &lenBytes);
            pbEncoded += lenBytes;
            for (i = 0; ret && i < encodedLen; i++)
            {
                if (str[i] <= 0x7f)
                    *pbEncoded++ = (BYTE)str[i];
                else
                {
                    *pcbEncoded = i;
                    SetLastError(CRYPT_E_INVALID_IA5_STRING);
                    ret = FALSE;
                }
            }
        }
    }