/**
* The default constructor.
*
* @param encryptionAlgorithm
* the encryption algorithm
* @param digestAlgorithm
* the digest algorithm
* @param mgf
* the mask generation function
*/
SignatureAlgorithm(EncryptionAlgorithm encryptionAlgorithm, DigestAlgorithm digestAlgorithm,
MaskGenerationFunction maskGenerationFunction)
{
this.EncryptionAlgorithm = encryptionAlgorithm;
this.DigestAlgorithm = digestAlgorithm;
this.MaskGenerationFunction = maskGenerationFunction;
}
/**
* Returns the digest algorithm associated to the given XML url or the default
* one if the algorithm does not exist.
*
* @param xmlName
* The XML representation of the digest algorithm
* @param defaultValue
* The default value for the {@code DigestAlgorithm}
* @return the corresponding {@code DigestAlgorithm} or the default value
*/
public static DigestAlgorithm ForXML(string xmlName, DigestAlgorithm defaultValue)
{
DigestAlgorithm algorithm = Registry.XML_ALGORITHMS[xmlName];
if (algorithm == null)
{
return(defaultValue);
}
return(algorithm);
}
/**
* Returns the digest algorithm associated to the given XML url.
*
* @param xmlName
* the algorithm uri
* @return the digest algorithm linked to the given uri
* @throws IllegalArgumentException
* if the uri doesn't match any digest
* algorithm
*/
public static DigestAlgorithm ForXML(string xmlName)
{
DigestAlgorithm algorithm = Registry.XML_ALGORITHMS[xmlName];
if (algorithm == null)
{
throw new ArgumentException("Unsupported algorithm: " + xmlName, nameof(xmlName));
}
return(algorithm);
}
/**
* Returns the digest algorithm associated to the given OID.
*
* @param oid
* the algorithm oid
* @return the digest algorithm linked to the oid
* @throws IllegalArgumentException
* if the oid doesn't match any digest
* algorithm
*/
public static DigestAlgorithm ForOID(string oid)
{
DigestAlgorithm algorithm = Registry.OID_ALGORITHMS[oid];
if (algorithm == null)
{
throw new ArgumentException("Unsupported algorithm: " + oid, nameof(oid));
}
return(algorithm);
}
/**
* Returns the digest algorithm associated to the given name.
*
* @param name
* the algorithm name
* @param defaultValue
* The default value for the {@code DigestAlgorithm}
* @return the corresponding {@code DigestAlgorithm} or the default value
*/
public static DigestAlgorithm ForName(string name, DigestAlgorithm defaultValue)
{
DigestAlgorithm algorithm = Registry.ALGORITHMS[name];
if (algorithm == null)
{
return(defaultValue);
}
return(algorithm);
}
/**
* Returns the digest algorithm associated to the given name.
*
* @param name
* the algorithm name
* @return the digest algorithm linked to the given name
* @throws IllegalArgumentException
* if the given name doesn't match any
* algorithm
*/
public static DigestAlgorithm ForName(string name)
{
DigestAlgorithm algorithm = Registry.ALGORITHMS[name];
if (algorithm == null)
{
throw new ArgumentException("Unsupported algorithm: " + name, nameof(name));
}
return(algorithm);
}
/**
* The default constructor.
*
* @param encryptionAlgorithm
* the encryption algorithm
* @param digestAlgorithm
* the digest algorithm
*/
private SignatureAlgorithm(EncryptionAlgorithm encryptionAlgorithm, DigestAlgorithm digestAlgorithm)
{
this.EncryptionAlgorithm = encryptionAlgorithm;
this.DigestAlgorithm = digestAlgorithm;
this.MaskGenerationFunction = null;
}
/**
* For given encryption algorithm and digest algorithm this function returns the signature algorithm.
*
* @param encryptionAlgorithm
* the encryption algorithm
* @param digestAlgorithm
* the digest algorithm
* @param mgf
* the mask generation function
* @return the corresponding combination of both algorithms
*/
public static SignatureAlgorithm GetAlgorithm(EncryptionAlgorithm encryptionAlgorithm, DigestAlgorithm digestAlgorithm,
MaskGenerationFunction?mgf)
{
StringBuilder sb = new StringBuilder();
if (digestAlgorithm != null)
{
sb.Append(digestAlgorithm.Name);
}
else
{
sb.Append("NONE");
}
sb.Append("with");
sb.Append(encryptionAlgorithm.Name);
if (mgf != null)
{
sb.Append("andMGF1");
}
return(JAVA_ALGORITHMS[sb.ToString()]);
}
/**
* For given encryption algorithm and digest algorithm this function returns the signature algorithm.
*
* @param encryptionAlgorithm
* the encryption algorithm
* @param digestAlgorithm
* the digest algorithm
* @return the corresponding combination of both algorithms
*/
public static SignatureAlgorithm GetAlgorithm(EncryptionAlgorithm encryptionAlgorithm, DigestAlgorithm digestAlgorithm)
{
return(GetAlgorithm(encryptionAlgorithm, digestAlgorithm, null));
}