DRM播放许可证获取

Question

我正在实施DRM服务器，到目前为止HLS工作正常，但我对playready密钥加密有问题，我知道我需要使用客户端请求中的公钥和License Nonce（IV）但我无法找到加密它的算法。

来自Microsoft playReady test server

的示例

客户要求：

＆＃13;

＆＃13;

<?xml version="1.0" encoding="utf-8"?>
<soap:Envelope xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/">
  <soap:Body>
    <AcquireLicense xmlns="http://schemas.microsoft.com/DRM/2007/03/protocols">
      <challenge>
        <Challenge xmlns="http://schemas.microsoft.com/DRM/2007/03/protocols/messages">
          <LA xmlns="http://schemas.microsoft.com/DRM/2007/03/protocols" Id="SignedData" xml:space="preserve">
            <Version>1</Version>
            <ContentHeader>
              <WRMHEADER xmlns="http://schemas.microsoft.com/DRM/2007/03/PlayReadyHeader" version="4.0.0.0">
                <DATA>
									<PROTECTINFO>
										<KEYLEN>16</KEYLEN>
										<ALGID>AESCTR</ALGID>
									</PROTECTINFO>
									<KID>7987aj+eE0uBlXi0N73AQw==</KID>
									<CHECKSUM>s1zZSs3Wwow=</CHECKSUM>
									<CUSTOMATTRIBUTES>
										<IIS_DRM_VERSION>7.1.1064.0</IIS_DRM_VERSION>
									</CUSTOMATTRIBUTES>
									<LA_URL>http://playready.directtaps.net/pr/svc/rightsmanager.asmx</LA_URL>
									<DS_ID>AH+03juKbUGbHl1V/QIwRA==</DS_ID>
								</DATA>
              </WRMHEADER>
            </ContentHeader>
            <CLIENTINFO>
              <CLIENTVERSION>2.0.0.1446</CLIENTVERSION>
            </CLIENTINFO>
            <RevocationLists>
              <RevListInfo>
                <ListID>ioydTlK2p0WXkWklprR5Hw==</ListID>
                <Version>11</Version>
              </RevListInfo>
              <RevListInfo>
                <ListID>gC4IKKPHsUCCVhnlttibJw==</ListID>
                <Version>11</Version>
              </RevListInfo>
              <RevListInfo>
                <ListID>BOZ1zT1UnEqfCf5tJOi/kA==</ListID>
                <Version>12</Version>
              </RevListInfo>
              <RevListInfo>
                <ListID>Ef/RUojT3U6Ct2jqTCChbA==</ListID>
                <Version>34</Version>
              </RevListInfo>
            </RevocationLists>
            <LicenseNonce>e7NgfwBi1xX/egdgV9BrWQ==</LicenseNonce>
            <EncryptedData xmlns="http://www.w3.org/2001/04/xmlenc#" Type="http://www.w3.org/2001/04/xmlenc#Element">
              <EncryptionMethod Algorithm="http://www.w3.org/2001/04/xmlenc#aes128-cbc" />
              <KeyInfo xmlns="http://www.w3.org/2000/09/xmldsig#">
                <EncryptedKey xmlns="http://www.w3.org/2001/04/xmlenc#">
                  <EncryptionMethod Algorithm="http://schemas.microsoft.com/DRM/2007/03/protocols#ecc256" />
                  <KeyInfo xmlns="http://www.w3.org/2000/09/xmldsig#">
                    <KeyName>WMRMServer</KeyName>
                  </KeyInfo>
                  <CipherData>
                    <CipherValue>W13Rs+iFyn5Qgh8iAduenxsRw3w2mOTNhfOPI6Fwv5kIn93cCauDFJexka6jtQHJ+by8wyTv4u7RofeZW9G8NakvV0JpGg7d5rEg1q1XMwy267Hecnch75FKEPSiydx2NU83IambHenRhJJ5gg3/u1aVpaXsCVtnQsv5pt5L+JM=</CipherValue>
                  </CipherData>
                </EncryptedKey>
              </KeyInfo>
              <CipherData>
                <CipherValue>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</CipherValue>
              </CipherData>
            </EncryptedData>
          </LA>
          <Signature xmlns="http://www.w3.org/2000/09/xmldsig#">
            <SignedInfo xmlns="http://www.w3.org/2000/09/xmldsig#">
              <CanonicalizationMethod Algorithm="http://www.w3.org/TR/2001/REC-xml-c14n-20010315" />
              <SignatureMethod Algorithm="http://schemas.microsoft.com/DRM/2007/03/protocols#ecdsa-sha256" />
              <Reference URI="#SignedData">
                <DigestMethod Algorithm="http://schemas.microsoft.com/DRM/2007/03/protocols#sha256" />
                <DigestValue>Y6z9FSz2qWpvIN823wrK13in0TnWGoAcPCKw9KlWZPk=</DigestValue>
              </Reference>
            </SignedInfo>
            <SignatureValue>u45hKzad6Wir2SLSY7WTkTxpziPY2w5WTiLbNSb0RyciFV8Xm2aFyLbOCpMW33ZYubN59lsaZy8fAjUsr7ManA==</SignatureValue>
            <KeyInfo xmlns="http://www.w3.org/2000/09/xmldsig#">
              <KeyValue>
                <ECCKeyValue>
                  <PublicKey>2sumijs/TOhMhxwvkmjp4nXwJku8UXFHU+oY4fg+sRTp/pM7O3/w4k4QXAAn69pHahdLN+6OGpnQfwTv4xzGCQ==</PublicKey>
                </ECCKeyValue>
              </KeyValue>
            </KeyInfo>
          </Signature>
        </Challenge>
      </challenge>
    </AcquireLicense>
  </soap:Body>
</soap:Envelope>

＆＃13;

＆＃13;

＆＃13;

服务器响应：

＆＃13;

＆＃13;

<?xml version="1.0" encoding="utf-8"?>
<soap:Envelope xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema">
	<soap:Body>
		<AcquireLicenseResponse xmlns="http://schemas.microsoft.com/DRM/2007/03/protocols">
			<AcquireLicenseResult>
				<Response xmlns="http://schemas.microsoft.com/DRM/2007/03/protocols/messages">
					<LicenseResponse xmlns="http://schemas.microsoft.com/DRM/2007/03/protocols">
						<Version>1</Version>
						<Licenses>
							<License>WE1SAAAAAAN7s2B/AGLXFf96B2BX0GtZAAMAAQAAAVAAAgAEAAAACAADAAIAAAAyAAAADQAAAAoAAQABADIAAAAMAAAAIgABADQAAAAKAJYAAAAzAAAACgABAAMACQAAAPIAAQAKAAAAnu/fO2o/nhNLgZV4tDe9wEMAAQADAIDB6u6Ltq5a8s2SvNkd4kAVzxDnlUysqzX6k5epsJ4iNaZaFyLTtpgVjTRQP2lgDeJaJSIObuf2yd2Qd1tWIQDk4gXxCbUPL8NJgdvl6d4z2xBIvJq4Ol3KDiHgkYn6mYEyniIm+2IWZUrUWsKo6Z2brnsoe3GoYoNmXkJ5+kyMOgAAACoAAABMAAEAQDrjNbZngMLUdzVuWakTkwXziavX6rZhzIaQJYQOWLtJSqiFpiWTutb777SRP48Zvx2FMpyqhGdjn53dLmsiRDYAAQALAAAAHAABABB8/phYFmuGw7Y3HoQs0swN</License>
						</Licenses>
						<Acknowledgement>
							<TransactionID>5c062475-4b2c-48e6-9b0b-54fce5b2b770</TransactionID>
						</Acknowledgement>
					</LicenseResponse>
				</Response>
			</AcquireLicenseResult>
		</AcquireLicenseResponse>
	</soap:Body>
</soap:Envelope>

＆＃13;

＆＃13;

＆＃13;

如何从客户端请求和我的16字节密钥创建许可证？