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KeyDerivationParameters.BuildForSP80056a Método

  • Referência

Definição

Namespace:
Windows.Security.Cryptography.Core
Editar

Cria um objeto KeyDerivationParameters para uso na função de derivação de chave 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

Parâmetros

algorithmId
IBuffer

Especifica a finalidade pretendida da chave derivada.

partyUInfo
IBuffer

Contém informações públicas contribuidas pelo iniciador.

partyVInfo
IBuffer

Contém informações públicas contribuidas pelo respondente.

suppPubInfo
IBuffer

Contém informações públicas conhecidas pelo iniciador e pelo respondente.

suppPrivInfo
IBuffer

Contém informações privadas conhecidas pelo iniciador e pelo respondente, como um segredo compartilhado.

Retornos

KeyDerivationParameters

Refere-se aos parâmetros usados durante a derivação de chave.

Exemplos

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);
}

Comentários

Você pode usar os seguintes nomes de algoritmo com a função OpenAlgorithm para abrir um provedor de algoritmoSP80056a KDF:

Aplica-se a