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SecurityHelper

Hash

Name
MD5
SHA1
SHA256
SHA384
SHA512

GetHash

generate hash from a string

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var md5 = SecurityHelper.GetHash(text, HashAlgorithm.MD5);
// C7F373BEB9BC8072DB7B41917B02A788

var sha256 = SecurityHelper.GetHash(text, HashAlgorithm.SHA256);
//A69AC8A63339FF52973B6FC4462EB685DF1AA5B795B39FAABE809C0263C8FACB

GetHashFromFileAsync

generate hash from a file

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var md5 = await SecurityHelper.GetHashFromFileAsync(filePath, HashAlgorithm.MD5);
// C7F373BEB9BC8072DB7B41917B02A788

var sha256 = await SecurityHelper.GetHashFromFileAsync(filePath, HashAlgorithm.SHA256);
//A69AC8A63339FF52973B6FC4462EB685DF1AA5B795B39FAABE809C0263C8FACB

EncryptBase64/DecryptBase64

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var encText = SecurityHelper.EncryptBase64("Hello");

var decText = SecurityHelper.DecryptBase64(encText);

Symmetric Encryption

EncryptStringAes/DecryptStringAes

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var encText = SecurityHelper.EncryptStringAes("text", out var key, out var iv);

var decText = SecurityHelper.DecryptStringAes(encText, key, iv);

EncryptFileAES/DecryptFileAES

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SecurityHelper.EncryptFileAES(inputFilePath, outputFilePath, out var aes_Key, out var aes_IV);

SecurityHelper.DecryptFileAES(outputFilePath, newOutputFilePath, aes_Key, aes_IV);

Asymmetric Encryption

EncryptStringAsymmetric/DecryptStringAsymmetric

Asymmetric Algorithm
DSA_SHA1
DSA_SHA256
ECDSA_P256_SHA256
ECDSA_P384_SHA384
ECDSA_P521_SHA512
RSA_OAEP_SHA1
RSA_OAEP_SHA256
RSA_OAEP_SHA384
RSA_OAEP_SHA512
RSA_PKCS1
RSASIGN_PKCS1_SHA1
RSASIGN_PKCS1_SHA256
RSASIGN_PKCS1_SHA384
RSASIGN_PKCS1_SHA512
RSASIGN_PSS_SHA1
RSASIGN_PSS_SHA256
RSASIGN_PSS_SHA384
RSASIGN_PSS_SHA512
ECDSA_SHA256
ECDSA_SHA384
ECDSA_SHA512 
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var encText = SecurityHelper.EncryptStringAsymmetric("Hello", publicKey);

var decText = SecurityHelper.DecryptStringAsymmetric(encText, privateKey);

if you want, you can generate Public/Private key:

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var keyPair = SecurityHelper.GenerateAsymmetricKeyPair(asymmetricAlgorithm, keySize);
IBuffer publicKeyBuffer = keyPair.ExportPublicKey();
IBuffer privateKeyBuffer = keyPair.Export();

var encText = SecurityHelper.EncryptStringAsymmetric("Hello", publicKeyBuffer);
var decText = SecurityHelper.DecryptStringAsymmetric(encText, privateKeyBuffer);

or you can convert IBuffer to string:

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string publicKey = CryptographicBuffer.EncodeToHexString(publicKeyBuffer);
string privateKey = CryptographicBuffer.EncodeToHexString(privateKeyBuffer);

var encText = SecurityHelper.EncryptStringAsymmetric("Hello", publicKey);
var decText = SecurityHelper.DecryptStringAsymmetric(encText, privateKey);

Demo

you can run demo and see this feature.