SignatureMethod
for the specified algorithm URI and parameters.
@param algorithm the URI identifying the signature algorithm
@param params algorithm-specific signature parameters (may be null
)
@return the SignatureMethod
@throws InvalidAlgorithmParameterException if the specified parametersare inappropriate for the requested algorithm
@throws NoSuchAlgorithmException if an implementation of thespecified algorithm cannot be found
@throws NullPointerException if algorithm
is null
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