◆ Pkcs12PbeDecrypt() [2/2]

static int System.Security.Cryptography.PasswordBasedEncryption.Pkcs12PbeDecrypt	(	System::Security::Cryptography::Asn1::AlgorithmIdentifierAsn	algorithmIdentifier,
		ReadOnlySpan< char >	password,
		HashAlgorithmName	hashAlgorithm,
		SymmetricAlgorithm	cipher,
		ReadOnlySpan< byte >	encryptedData,
		Span< byte >	destination )

inlinestaticprivate

Definition at line 531 of file PasswordBasedEncryption.cs.

    {
        if (!algorithmIdentifier.Parameters.HasValue)
        {
            throw new CryptographicException(System.SR.Cryptography_Der_Invalid_Encoding);
        }
        if (cipher.KeySize > 256 || cipher.BlockSize > 256)
        {
            throw new CryptographicException();
        }
        System.Security.Cryptography.Asn1.PBEParameter pBEParameter = System.Security.Cryptography.Asn1.PBEParameter.Decode(algorithmIdentifier.Parameters.Value, AsnEncodingRules.BER);
        int iterationCount = NormalizeIterationCount(pBEParameter.IterationCount, 600000);
        Span<byte> span = stackalloc byte[cipher.BlockSize / 8];
        Span<byte> span2 = stackalloc byte[cipher.KeySize / 8];
        ReadOnlySpan<byte> span3 = pBEParameter.Salt.Span;
        try
        {
            System.Security.Cryptography.Pkcs.Pkcs12Kdf.DeriveIV(password, hashAlgorithm, iterationCount, span3, span);
            System.Security.Cryptography.Pkcs.Pkcs12Kdf.DeriveCipherKey(password, hashAlgorithm, iterationCount, span3, span2);
            return Decrypt(cipher, span2, span, encryptedData, destination);
        }
        finally
        {
            CryptographicOperations.ZeroMemory(span2);
            CryptographicOperations.ZeroMemory(span);
        }
    }