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Clarify masking of bits in Field::random impls

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Co-Authored-By: Daira Hopwood <daira@jacaranda.org>
This commit is contained in:
str4d
2019-07-26 19:43:42 +01:00
committed by GitHub
parent c4e14ad0b1
commit 0255dca16e
2 changed files with 2 additions and 2 deletions
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2
ff/ff_derive/src/lib.rs
View File

@@ -892,7 +892,7 @@ fn prime_field_impl(
#name(#repr(repr)) #name(#repr(repr))
}; };
// Mask away the unused bits at the beginning. // Mask away the unused most-significant bits.
tmp.0.as_mut()[#top_limb_index] &= 0xffffffffffffffff >> REPR_SHAVE_BITS; tmp.0.as_mut()[#top_limb_index] &= 0xffffffffffffffff >> REPR_SHAVE_BITS;
if tmp.is_valid() { if tmp.is_valid() {

2
sapling-crypto/src/jubjub/fs.rs
View File

@@ -292,7 +292,7 @@ impl Field for Fs {
Fs(FsRepr(repr)) Fs(FsRepr(repr))
}; };
// Mask away the unused bits at the beginning. // Mask away the unused most-significant bits.
tmp.0.as_mut()[3] &= 0xffffffffffffffff >> REPR_SHAVE_BITS; tmp.0.as_mut()[3] &= 0xffffffffffffffff >> REPR_SHAVE_BITS;
if tmp.is_valid() { if tmp.is_valid() {