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D.12.3.58 is_h_injective

Procedure from library crypto.lib (see crypto_lib).

Usage:
is_h_injective(a, h)

Return:
1 if a is h-injective, 0 otherwise

Example:
 
LIB "crypto.lib";
list h_inj = 1,2,4,10,17;
is_h_injective(h_inj,3);
==> 1
//1+2+4+10=17
is_h_injective(h_inj,4);
==> 0