KeyDerivationParameters.BuildForSP80056a Método

Definición

Espacio de nombres:

Windows.Security.Cryptography.Core

Crea un objeto KeyDerivationParameters para su uso en la función de derivación de claves SP800-56A.

public:
 static KeyDerivationParameters ^ BuildForSP80056a(IBuffer ^ algorithmId, IBuffer ^ partyUInfo, IBuffer ^ partyVInfo, IBuffer ^ suppPubInfo, IBuffer ^ suppPrivInfo);

 static KeyDerivationParameters BuildForSP80056a(IBuffer const& algorithmId, IBuffer const& partyUInfo, IBuffer const& partyVInfo, IBuffer const& suppPubInfo, IBuffer const& suppPrivInfo);

public static KeyDerivationParameters BuildForSP80056a(IBuffer algorithmId, IBuffer partyUInfo, IBuffer partyVInfo, IBuffer suppPubInfo, IBuffer suppPrivInfo);

function buildForSP80056a(algorithmId, partyUInfo, partyVInfo, suppPubInfo, suppPrivInfo)

Public Shared Function BuildForSP80056a (algorithmId As IBuffer, partyUInfo As IBuffer, partyVInfo As IBuffer, suppPubInfo As IBuffer, suppPrivInfo As IBuffer) As KeyDerivationParameters

Parámetros

algorithmId

IBuffer

Especifica el propósito previsto de la clave derivada.

partyUInfo

IBuffer

Contiene información pública aportada por el iniciador.

partyVInfo

IBuffer

Contiene información pública aportada por el respondedor.

suppPubInfo

IBuffer

Contiene información pública conocida tanto para el iniciador como para el respondedor.

suppPrivInfo

IBuffer

Contiene información privada conocida tanto para el iniciador como para el respondedor, como un secreto compartido.

Devoluciones

KeyDerivationParameters

Hace referencia a los parámetros usados durante la derivación de claves.

Ejemplos

public void SampleDeriveFromSP80056a()
{
    // Create a string that contains the algorithm name.
    String strAlgName = KeyDerivationAlgorithmNames.Sp80056aConcatSha512;

    // Open the specified algorithm.
    KeyDerivationAlgorithmProvider objKdfProv = KeyDerivationAlgorithmProvider.OpenAlgorithm(strAlgName);

    // Specify the requested size, in bytes, of the derived key. 
    UInt32 targetSize = 32;

    // Create a buffer that contains the secret to be used during derivation.
    IBuffer buffSecret = CryptographicBuffer.GenerateRandom(32);

    // Create a buffer that contains the intended purpose of the derived key.
    String strAlgId = "Purpose";
    IBuffer buffAlgId = CryptographicBuffer.ConvertStringToBinary(strAlgId, BinaryStringEncoding.Utf8);

    // Create a buffer that contains public information contributed by the initiator.
    String strPartyUInfo = "Initiator public info";
    IBuffer buffPartyUInfo = CryptographicBuffer.ConvertStringToBinary(strPartyUInfo, BinaryStringEncoding.Utf8);

    // Create a buffer that contains public information contributed by the responder.
    String strPartyVInfo = "Responder public info";
    IBuffer buffPartyVInfo = CryptographicBuffer.ConvertStringToBinary(strPartyVInfo, BinaryStringEncoding.Utf8);

    // Create a buffer that contains public information known to both parties.
    String strSuppPubInfo = "Two party public info";
    IBuffer buffSuppPubInfo = CryptographicBuffer.ConvertStringToBinary(strSuppPubInfo, BinaryStringEncoding.Utf8);

    // Create a buffer that contains a shared private secret.
    IBuffer buffSuppPrivInfo = CryptographicBuffer.GenerateRandom(32);

    // Create the derivation parameters.
    KeyDerivationParameters kdf80056AParamsEx = KeyDerivationParameters.BuildForSP80056a(
        buffAlgId,
        buffPartyUInfo,
        buffPartyVInfo,
        buffSuppPubInfo,
        buffSuppPrivInfo);

    // Create a key from the secret value.
    CryptographicKey keyOriginal = objKdfProv.CreateKey(buffSecret);

    // Derive a key based on the original key and the derivation parameters.
    IBuffer keyDerived = CryptographicEngine.DeriveKeyMaterial(
        keyOriginal,
        kdf80056AParamsEx,
        targetSize);

    // Encode the key to a hexadecimal value (for display)
    String strKeyHex = CryptographicBuffer.EncodeToHexString(keyDerived);
}

Comentarios

Puede usar los siguientes nombres de algoritmo con la función OpenAlgorithm para abrir un proveedor de algoritmoS KDF SP80056a:

• KeyDerivationAlgorithmNames.Sp80056aConcatMd5
• KeyDerivationAlgorithmNames.Sp80056aConcatSha1
• KeyDerivationAlgorithmNames.Sp80056aConcatSha256
• KeyDerivationAlgorithmNames.Sp80056aConcatSha384
• KeyDerivationAlgorithmNames.Sp80056aConcatSha512