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D.12.2.13 squareRoot

Procedure from library crypto.lib (see crypto_lib).

Usage:
squareRoot(a,p);

Return:
the square root of a in Z/p, p prime

Note:
assumes the Jacobi symbol is 1 or p=2.

Example:
 
LIB "crypto.lib";
squareRoot(8315890421938608,32003);
==> 18784