private static string GetSignatureAlgorithm(SecurityKey key)
{
// If key is null, an exception is thrown.
if (key == null)
throw new ArgumentNullException("key");
// Set signatureAlgorithm to null.
string signatureAlgorithm = null;
// If the security key supports RsaSha1 then use that ...
if (key.IsSupportedAlgorithm(SecurityAlgorithms.RsaSha1Signature))
signatureAlgorithm = SecurityAlgorithms.RsaSha1Signature;
// ... otherwise if it supports HMACSha1 use that ...
else if (key.IsSupportedAlgorithm(SecurityAlgorithms.HmacSha1Signature))
signatureAlgorithm = SecurityAlgorithms.HmacSha1Signature;
return signatureAlgorithm;
}
private static string GetEncryptionAlgorithm(SecurityKey key)
{
// If key is null, an exception is thrown.
if (key == null)
throw new ArgumentNullException("key");
// Set encryptionAlgorithm to null.
string encryptionAlgorithm = null;
// If the security key supports AES256 use that ...
if (key.IsSupportedAlgorithm(SecurityAlgorithms.Aes256Encryption))
encryptionAlgorithm = SecurityAlgorithms.Aes256Encryption;
// ... otherwise if it supports AES192 use that ...
else if (key.IsSupportedAlgorithm(SecurityAlgorithms.Aes192Encryption))
encryptionAlgorithm = SecurityAlgorithms.Aes192Encryption;
// ... otherwise if it supports AES128 use that ...
else if (key.IsSupportedAlgorithm(SecurityAlgorithms.Aes128Encryption))
encryptionAlgorithm = SecurityAlgorithms.Aes128Encryption;
return encryptionAlgorithm;
}
private static string GetKeyWrapAlgorithm(SecurityKey key)
{
// If key is null, an exception is thrown.
if (key == null)
throw new ArgumentNullException("key");
// Set keywrapAlgorithm to null.
string keywrapAlgorithm = null;
// If the security key supports RsaOaep then use that ...
if (key.IsSupportedAlgorithm(SecurityAlgorithms.RsaOaepKeyWrap))
keywrapAlgorithm = SecurityAlgorithms.RsaOaepKeyWrap;
// ... otherwise if it supports RSA15 use that ...
else if (key.IsSupportedAlgorithm(SecurityAlgorithms.RsaV15KeyWrap))
keywrapAlgorithm = SecurityAlgorithms.RsaV15KeyWrap;
// ... otherwise if it supports AES256 use that ...
else if (key.IsSupportedAlgorithm(SecurityAlgorithms.Aes256KeyWrap))
keywrapAlgorithm = SecurityAlgorithms.Aes256KeyWrap;
// ... otherwise if it supports AES192 use that ...
else if (key.IsSupportedAlgorithm(SecurityAlgorithms.Aes192KeyWrap))
keywrapAlgorithm = SecurityAlgorithms.Aes192KeyWrap;
// ... otherwise if it supports AES128 use that ...
else if (key.IsSupportedAlgorithm(SecurityAlgorithms.Aes128KeyWrap))
keywrapAlgorithm = SecurityAlgorithms.Aes128KeyWrap;
return keywrapAlgorithm;
}
