Feature/compressed try from #1
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This reduces copy-pasta in downstream users to check the length of the slice beforehand.
isislovecruft
requested changes
Oct 28, 2019
src/scalar.rs
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| impl From<[u8; 32]> for Scalar { | ||
| fn from(bytes: [u8; 32]) -> Self { | ||
| Scalar{ bytes } | ||
| } | ||
| } | ||
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This would allow users to construct noncanonical Scalars, both in that the most significant bit could be set, which is explicitly disallowed, and in that they could be unreduced modulo the basepoint order.
src/scalar.rs
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| let mut s_bytes = [0x00u8; 32]; | ||
| s_bytes.copy_from_slice(bytes); | ||
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| Ok(Scalar::from_bits(s_bytes)) |
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I feel very nervous calling from_bits() under the hood here, it should only be called when explicitly needed, for protocols that rely on it such as x25519 diffie-hellman, because it allows unreduced Scalars to be constructed.
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…t, CompressedEdwardsY and Scalar
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Kind of targeting for different purposes, since there was the change from the default lib |
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TryFrom<&[u8]>to ScalarFrom<[u8; 32]>to types that reflects this structure