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7 Commits

Author SHA1 Message Date
Frank Denis
0d9c474ecf std/crypto: implement the Hash-To-Curve standard for Edwards25519 
https://github.com/cfrg/draft-irtf-cfrg-hash-to-curve

This is quite an important feature to have since many other standards
being worked on depend on this operation.

Brings a couple useful arithmetic operations on field elements by the way.

This PR also adds comments to the functions we expose in 25519/field
so that they can appear in the generated documentation.
 2020-11-17 17:06:38 -08:00
Frank Denis
fb63a2cfae std/crypto: faster (mod 2^255-19) square root computation 
251 squarings, 250 multiplications -> 251 squarings, 11 multiplications
 2020-10-06 19:48:26 -04:00
Andrew Kelley
4a69b11e74 add license header to all std lib files 
add SPDX license identifier
copyright ownership is zig contributors
 2020-08-20 16:07:04 -04:00
Frank Denis
8d60047697 ristretto255: add uniform string->element map & fast equivalence check 2020-08-18 00:31:02 -04:00
Frank Denis
37ae246405 Inline Fe.{sub,mul,sq} for a performance boost in release-safe mode 2020-08-16 22:35:28 -07:00
Frank Denis
ed558bfbaa Address @daurnimator feedback 2020-08-16 22:35:27 -07:00
Frank Denis
dd8f7b396c Rename the field and scalar modules 
Suggested by @kubkon
 2020-08-16 22:35:27 -07:00