Montgomery reduction: Difference between revisions
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(→{{header|Tcl}}: added zkl) |
m (→{{header|zkl}}: tweak) |
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fcn montgomeryReduce(modulus,T){ |
fcn montgomeryReduce(modulus,T){ |
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_assert_(modulus.isOdd); |
_assert_(modulus.isOdd); |
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bits:=modulus.len(2); |
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a:=BN(T); // we'll do in place math |
a:=BN(T); // we'll do in place math |
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do(modulus.len(2)){ // bits needed to hold modulus |
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foreach i in (bits){ |
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if(a.isOdd) a.add(modulus); |
if(a.isOdd) a.add(modulus); |
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a.div(2); // a>>=1 |
a.div(2); // a>>=1 |
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