Module: Crypto_math
Overview
Functions convenient for cryptography
Instance Method Summary collapse
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#mod_exp(n, q) ⇒ Object
by Eric Lee Green.
Instance Method Details
#mod_exp(n, q) ⇒ Object
by Eric Lee Green. x.mod_exp(n,q) returns x ** n % q
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# File 'lib/openid/util.rb', line 12 def mod_exp(n,q) counter=0 n_p=n # N y_p=1 # Y z_p=self # Z while n_p != 0 if n_p[0]==1 y_p=(y_p*z_p) % q end n_p = n_p >> 1 z_p = (z_p * z_p) % q counter += 1 end return y_p end |