mirror of https://github.com/zcash/orchard.git
mul_fixed::base_field_elem: Add constraint alpha_2 = 0 => alpha_1 = 0.
Co-authored-by: Daira Hopwood <daira@jacaranda.org>
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@ -126,7 +126,7 @@ impl Config {
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let alpha_2_range_check = range_check(alpha_2.clone(), 1 << 1);
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// Check that α_1 + 2^2 α_2 = z_84_alpha
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let z_84_alpha_check = z_84_alpha.clone()
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- (alpha_1 + alpha_2.clone() * pallas::Base::from_u64(1 << 2));
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- (alpha_1.clone() + alpha_2.clone() * pallas::Base::from_u64(1 << 2));
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// Check that the witnessed α_0 fulfils the constraint α_0 = α - z_84_alpha * 2^252
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let two_pow_252 = pallas::Base::from_u128(1 << 126).square();
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@ -166,6 +166,7 @@ impl Config {
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//
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let canon_checks = {
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std::iter::empty()
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.chain(Some(("MSB = 1 => alpha_1 = 0", alpha_2.clone() * alpha_1)))
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.chain(Some((
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"MSB = 1 => z_13_alpha_0 = 0",
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alpha_2.clone() * z_13_alpha_0,
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