Isis Lovecruft
804dab8924
Merge remote-tracking branch 'floodyberry/optimized_scalar' into develop
2017-10-05 02:57:55 +00:00
Isis Lovecruft
5d15ca77ff
Merge branch 'feature/montgomery-arithmetic_r1' into develop
2017-10-05 02:37:27 +00:00
Isis Lovecruft
d39e47ff11
Remove comment on non-canonical encodings in CompressedMontgomeryU.decompress().
2017-10-05 02:27:27 +00:00
Isis Lovecruft
4965238b5a
Removed now unused subtle import from montgomery module.
2017-10-05 02:23:55 +00:00
Isis Lovecruft
29f9090411
Fix two typos in docstrings for constants.
2017-10-05 02:23:34 +00:00
Isis Lovecruft
9da24d8afa
Add test for Montgomery ladder with a scalar with high bit set.
2017-10-05 02:15:28 +00:00
Isis Lovecruft
ca5b58c2b7
Clarify doc note on degenerate cases for differential addition.
2017-10-05 01:54:26 +00:00
Isis Lovecruft
7b378ada6b
Rephrase doc note on exceptional projective Montgomery points.
2017-10-05 01:46:42 +00:00
Isis Lovecruft
5e6e6c3fa8
Eliminate extra inversions in MontgomeryPoint.ct_eq().
2017-10-05 01:32:44 +00:00
Isis Lovecruft
7e4fd5677c
Add tests and benchmark for MontgomeryPoint.ct_eq().
2017-10-05 01:26:15 +00:00
Isis Lovecruft
d39cb275c5
Remove DecafPoint.to_edwards() method.
2017-10-05 00:56:40 +00:00
Isis Lovecruft
c08591a7d8
Improve documentation for Mongomery code.
2017-10-04 07:31:11 +00:00
Isis Lovecruft
ecef4d836e
Make FieldElement limbs private to the curve25519-dalek crate.
...
Limbs are no longer accessible outside of the curve25519-dalek crate.
If you were relying on this behaviour, first you probably shouldn't be
doing that, second please contact us so we can determine the best way
forward for your use case.
2017-10-01 23:36:57 +00:00
Andrew Moon
7e53499a10
optimized scalar implementations for 32/64 bit
2017-09-24 22:24:35 -05:00
Isis Lovecruft
6be10341e2
Add benchmarks for Mongomery point (de)compression and laddering.
2017-09-14 04:55:11 +00:00
Isis Lovecruft
2939d26b5c
Remove direct compression methods between points in curve models.
...
compress_edwards() is now named compress() and works only on points
which are in Edwards form. Similarly, compress_montgomery() is now
also called compress(), and it only works on point already in
Mongomery form.
To switch between forms, use to_montgomery().
Conversion from Montgomery directly to Edwards is not yet implemented.
* CHANGE the API requested in
https://github.com/isislovecruft/curve25519-dalek/issues/47 ,
hopefully for the better.
2017-09-14 04:55:11 +00:00
Isis Lovecruft
acd3826fe2
Implement Montgomery arithmetic and laddering.
...
* ADDs part of https://github.com/isislovecruft/curve25519-dalek/issues/47
2017-09-14 02:09:14 +00:00
Brian Smith
7ed9eb8617
Replace one multiplication with a squaring in scalar inversion.
...
This brings the code up to date with the 2017-09-04 version of
the source article.
2017-09-04 09:45:13 -10:00
Brian Smith
028140bb33
Reformat addition chain window building code to better show pattern.
...
Make the 2 digit, `_10`, the first argument to more closely match the
Haskell code in the source article. Align the code into columns to
further clarify the patterns.
2017-09-04 09:23:27 -10:00
Brian Smith
91a7c641c2
Use more efficient addition chain for scalar inversion.
...
Use the addition chain from
https://briansmith.org/ecc-inversion-addition-chains-01#curve25519_scalar_inversion .
In my benchmarking, this consistently runs at least 20% faster.
2017-09-03 17:00:42 -10:00
khyperia
6747133519
Optimize scalar inversion by implementing square()
...
This shows an 11% speedup for invert()
2017-08-21 21:35:26 -07:00
Isis Lovecruft
17290db44c
Update copyright/license headers in source files.
2017-08-15 05:09:20 +00:00
Henry de Valence
c29103d109
Rename _BASEPOINT to _BASEPOINT_POINT.
...
Having _BASEPOINT_TABLE and _BASEPOINT_POINT means that it's not possible to
use the slow, generic scalar mult in place of the fast, precomputed scalar
mults.
2017-08-14 00:20:18 -07:00
Henry de Valence
afecd4f438
Fixup types and publication
2017-08-13 23:57:57 -07:00
Henry de Valence
ea845b4163
Fix missing import in tests
2017-08-02 23:08:46 -07:00
Henry de Valence
3dddecb4a8
Move Montgomery code to a montgomery.rs module
2017-08-02 22:58:15 -07:00
Henry de Valence
8ad02e2f57
Move curve.rs to edwards.rs
2017-08-02 22:35:12 -07:00
Isis Lovecruft
2d15619c6c
Add DecafPoint.to_bytes().
2017-08-01 19:30:51 +00:00
Isis Lovecruft
4d8c18fff3
Add documentation warnings on FieldElement32 and FieldElement64.
2017-08-01 02:46:14 +00:00
Isis Lovecruft
f2883028dc
Use subtle version 0.2.0.
...
* CLOSES PR#66 https://github.com/isislovecruft/curve25519-dalek/pull/66
2017-08-01 02:22:43 +00:00
Isis Lovecruft
7202ab8e63
Merge remote-tracking branch 'hdevalence/feature/constant-time-k-fold-scalar-mult' into develop
2017-08-01 01:51:58 +00:00
Henry de Valence
ddaf602a09
Add multiscalar_mult to Decaf.
2017-07-31 18:40:53 -07:00
Henry de Valence
d2ce1ce5dc
Revert "Add size checking to multiscalar multiplication."
...
This reverts commit 720da348c0https://github.com/rust-lang/rust/issues/34433 .
2017-07-31 18:23:26 -07:00
Henry de Valence
720da348c0
Add size checking to multiscalar multiplication.
2017-07-30 23:54:13 -07:00
Henry de Valence
2d01aa1bf7
Add fixme note on cache awareness
2017-07-30 22:26:18 -07:00
Henry de Valence
63ee9d21ae
tweak code arrangement to keep comments together
2017-07-30 22:24:58 -07:00
Henry de Valence
aaefb90ed3
Rename k_fold_scalar_mult to multiscalar_mult
2017-07-30 22:16:22 -07:00
Henry de Valence
9c4046c3d9
Add constant-time k-fold scalar multiplication
2017-07-30 21:13:56 -07:00
Henry de Valence
f72de04003
Remove unneeded imports to suppress warnings
2017-07-30 16:29:37 -07:00
Henry de Valence
77103986a3
Split field arithmetic into per-implementation files
...
Split the field arithmetic implementations into `FieldElement`,
`FieldElement32`, and `FieldElement64`. `FieldElement` is a type alias for one
of `FieldElement32` or `FieldElement64`, depending on feature selection.
`field.rs` contains tests and code which is generic with respect to the
implementation (e.g., inversions), while `field_32bit.rs` and `field_64bit.rs`
contain the implementation-specific code.
The implementation is not completely hidden, since `FieldElement32` and
`FieldElement64` are tuple structs whose elements are public; `pub(crate)`
doesn't seem to work for tuple structs.
Similarly, the constants file is split over multiple files, depending on the
implementation.
2017-07-30 16:25:42 -07:00
Henry de Valence
513ce26942
avoid 128-bit multiplications
2017-07-20 21:33:15 -07:00
Isis Lovecruft
4e63cbfe4c
Merge remote-tracking branch 'chain/no_std-fix' into develop
2017-06-26 20:14:38 +00:00
Tony Arcieri
d9742c2367
Switch from libcollections to liballoc (gated on an "alloc" feature)
...
libcollections was recently merged into liballoc:
https://github.com/rust-lang/rust/pull/42648
I went ahead and also added an "alloc" feature which no_std users can use to opt
into liballoc features (i.e. any code using Vec). This should have no effect on
anything but no_std usage. It does make it possible for people without
allocators to use curve25519-dalek if they want though. Might be nice for
"bare metal" development.
All that said, from what I can gather liballoc, while not "stable", should
likely stick around for the forseeable future.
Some backstory on the liballoc/libcollections merge here:
https://github.com/rust-lang/rust/pull/42565
2017-06-19 16:59:45 -07:00
Isis Lovecruft
4bcf8bed9d
Move subtle to its own crate.
2017-05-31 21:20:56 +00:00
Isis Lovecruft
161c0cd96d
Add a doctest for subtle::bytes_equal().
2017-05-31 01:31:40 +00:00
Isis Lovecruft
43481a9ff6
Change the whitespace because Boats made fun of it on twitter.
2017-05-31 01:31:37 +00:00
Isis Lovecruft
4ecf6ab326
Implement constant-time selection between two things.
2017-05-31 01:29:59 +00:00
Isis Lovecruft
16904432be
Remove an unnecessary explicit return in FieldElement.to_bytes().
2017-05-28 22:45:13 +00:00
Isis Lovecruft
674a00df5b
Some rustfmt fixes. I disagreed with all the other ones.
2017-05-28 22:42:09 +00:00
Isis Lovecruft
648f95887a
Rename subtle::bytes_equal_ct() to bytes_equal().
2017-05-27 18:35:34 +00:00
Isis Lovecruft
1c4f283be4
Change debug_assert to assert in arrays_equal().
2017-05-27 18:28:37 +00:00
Isis Lovecruft
60692ce891
Put math/code in a docstring in ticks.
2017-05-27 18:24:08 +00:00
Isis Lovecruft
2485472023
Remove explicit lifetime, caught by clippy.
2017-05-27 18:23:31 +00:00
Isis Lovecruft
044128dc58
Remove excessive clone() on Copy, caught by clippy.
2017-05-27 18:21:37 +00:00
Isis Lovecruft
3a664a054a
Whitespace fix in decaf module.
2017-05-27 01:20:14 +00:00
Isis Lovecruft
3decdbed0d
Make arrays_equal() work for any size &[u8], as long as sizes are equal.
2017-05-26 22:39:20 +00:00
Isis Lovecruft
0c38718346
Rename subtle::arrays_equal_ct() to subtle::arrays_equal().
...
It's already obvious that it's constant-time because it's in the subtle
module.
2017-05-26 22:35:45 +00:00
Isis Lovecruft
e74be0024d
Better documentation for arrays_equal_ct.
2017-05-26 21:22:31 +00:00
Isis Lovecruft
a12c2979fb
Fix the doctest for byte_is_nonzero.
2017-05-26 20:53:18 +00:00
Isis Lovecruft
c6057cb2d0
Merge remote-tracking branch 'hdevalence/feature/fast-decaf' into develop
2017-05-25 21:51:57 +00:00
Isis Lovecruft
8772e863e7
Merge remote-tracking branch 'manishearth/fuzz' into develop
2017-05-25 21:50:48 +00:00
Isis Lovecruft
00f3a20329
Merge branch 'feature/add-sub-assign' into develop
2017-05-21 23:04:06 +00:00
Henry de Valence
58982cbc2b
Lower the trial number in decaf_random
...
The radix_51 implementation has many more debug checks, so this takes quite
long to run, and it's rude to run a fuzzer on the CI server.
2017-05-20 21:39:58 -07:00
Henry de Valence
27dbfa9536
Use Mike Hamburg's trick for Decaf compression.
2017-05-20 21:39:58 -07:00
Henry de Valence
52e51bdb16
Add constants for 1/sqrt(a-d) and 1/(a-d)
2017-05-20 21:39:58 -07:00
Henry de Valence
e4913dfc2b
Batch inversions in Decaf decompression.
2017-05-20 21:39:58 -07:00
Henry de Valence
273db53cfd
Benchmark Edwards decompression and compression
2017-05-20 21:39:58 -07:00
Henry de Valence
f741e50eb5
Add a test against current encodings of small multiples of the ed25519 basepoint
2017-05-20 21:39:58 -07:00
Manish Goregaokar
e076079772
Add cargo-fuzz
2017-05-19 16:44:05 -07:00
Henry de Valence
714bf3dd07
Set the number of trials back to 10,000
2017-05-19 14:23:51 -07:00
Henry de Valence
fbd8d0a605
Rewrite decaf elligator code to avoid two consecutive additions
2017-05-19 14:23:51 -07:00
Henry de Valence
b6cb7a7983
Increase number of trials for decaf elligator
2017-05-19 14:23:51 -07:00
Isis Lovecruft
e374451249
Implement {AddAssign, SubAssign} for DecafPoint.
2017-05-18 23:02:39 +00:00
Isis Lovecruft
27e4ea5181
Add a divider to separate Neg code from Add/Sub.
2017-05-18 23:01:31 +00:00
Isis Lovecruft
ed315ffcae
Implement {AddAssign, SubAssign} for ExtendedPoint.
2017-05-18 23:00:55 +00:00
Isis Lovecruft
b97868beb8
Remove unused import of ExtendedPoint in decaf::test module.
2017-05-18 03:44:42 +00:00
Isis Lovecruft
cc86091224
Remove unused import of DecafPoint in curve module.
2017-05-18 03:43:42 +00:00
Isis Lovecruft
767c99adf5
Remove unused assignment in a decaf test.
2017-05-18 03:43:15 +00:00
Isis Lovecruft
891cf76aab
Remove unused imports in curve::bench module.
2017-05-18 03:42:31 +00:00
Isis Lovecruft
0b70ab3638
Move DecafPoint * Scalar definition to decaf module.
2017-05-18 02:57:10 +00:00
Isis Lovecruft
e3adf3eea3
Merge remote-tracking branch 'hdevalence/feature/decaf_elligator_hash_to_point' into develop
2017-05-18 02:50:28 +00:00
Henry de Valence
aea15e8612
remove debugging println!s
2017-05-15 22:40:09 -07:00
Henry de Valence
69c62a8a17
Serde Scalar support
2017-05-15 22:40:09 -07:00
Henry de Valence
d3515e8cbf
Add test that decompressing an invalid point with serde fails
2017-05-15 22:40:09 -07:00
Henry de Valence
69fd268aa4
Make serde an optional feature
2017-05-15 22:40:09 -07:00
Henry de Valence
7c32271346
Initial work on Serde support
2017-05-15 22:37:50 -07:00
Henry de Valence
608634a7bd
Implement DecafPoint::{random, hash_from_bytes, from_hash} using Decaf-flavoured elligator
2017-05-15 21:06:26 -07:00
Isis Lovecruft
fe58e81bbc
Add missing conditional import for collection::Vec.
2017-05-14 11:16:07 +00:00
Isis Lovecruft
4a646806b8
Merge branch 'feature/scalarmult-lhs' into develop
2017-05-14 09:35:15 +00:00
Isis Lovecruft
61d07693ec
Merge remote-tracking branch 'hdevalence/feature/operator_scalar_mult_r2' into develop
2017-05-14 09:34:45 +00:00
Isis Lovecruft
ae11d4bc76
Merge remote-tracking branch 'hdevalence/feature/vartime-module' into develop
2017-05-14 09:34:14 +00:00
Isis Lovecruft
1b7b57c351
Make basepoint multiplication for precomputed tables go both ways.
2017-05-14 03:10:26 +00:00
Isis Lovecruft
7478814dfc
Implement CTAssignable for DecafPoint.
2017-05-14 02:59:54 +00:00
Isis Lovecruft
b6faf7c05e
Implement CTAssignable for ExtendedPoint.
2017-05-14 02:31:36 +00:00
Isis Lovecruft
738049619b
Also make scalar multiplication with DecafPoints go both ways.
2017-05-09 02:04:22 +00:00
Isis Lovecruft
944e8e1649
Fix and allow some non-snakecased variables in scalar tests.
2017-05-09 00:05:11 +00:00
Isis Lovecruft
4da1d795a1
Make scalar multiplication go both ways.
...
Being able to do `P * s`, but not `s * P`, is slightly annoying, particularly
with longer equations when it is desired to be able to glance at the maths and
see that the code is the same.
Now either syntax is allowed.
2017-05-09 00:01:48 +00:00
Isis Lovecruft
9a9959061d
Merge remote-tracking branch 'hdevalence/feature/clippy-fixes' into develop
2017-05-06 00:16:09 +00:00
Isis Lovecruft
8f4114a211
Merge remote-tracking branch 'hdevalence/feature/streamable-hash-to-scalar' into develop
2017-05-05 23:52:59 +00:00
Henry de Valence
c18627f7c2
Generalize k_fold_scalar_mult
2017-05-04 00:02:29 -07:00
