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25 lines
506 B
25 lines
506 B
/* Xor3 function for sha256
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out = a ^ b ^ c =>
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out = a+b+c - 2*a*b - 2*a*c - 2*b*c + 4*a*b*c =>
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out = a*( 1 - 2*b - 2*c + 4*b*c ) + b + c - 2*b*c =>
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mid = b*c
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out = a*( 1 - 2*b -2*c + 4*mid ) + b + c - 2 * mid
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*/
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template Xor3(n) {
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signal input a[n];
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signal input b[n];
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signal input c[n];
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signal output out[n];
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signal mid[n];
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for (var k=0; k<n; k++) {
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mid[k] <== b[k]*c[k];
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out[k] <== a[k] * (1 -2*b[k] -2*c[k] +4*mid[k]) + b[k] + c[k] -2*mid[k];
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}
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}
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