ecdsa: add RFC6979 test (plus dev::curve module)
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Adds a test that the RFC6979 implementation produces the correct ephemeral scalar (`k`) for the test vector in RFC 6979 Appendix 2.5: https://tools.ietf.org/html/rfc6979#appendix-A.2.5 This unfortunately requires basic scalar support, as RFC6979 uses rejection sampling to select a `k` value, so this commit also contains the rudiments of a P-256 scalar implementation necessary to implement the test. Hopefully this will be useful for testing other aspects of ECDSA, or potentially ensuring that the scalars of an ECDSA signature are in-range generically, even if no curve arithmetic backend is available.
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@@ Coverage Diff @@
## master #136 +/- ##
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- Coverage 36.57% 30.03% -6.55%
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Files 7 8 +1
Lines 257 313 +56
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Hits 94 94
- Misses 163 219 +56
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Adds a test that the RFC6979 implementation produces the correct ephemeral scalar (
k) for the test vector in RFC 6979 Appendix 2.5:https://tools.ietf.org/html/rfc6979#appendix-A.2.5
This unfortunately requires basic scalar support, as RFC6979 uses rejection sampling to select a
kvalue, so this commit also contains the rudiments of a P-256 scalar implementation necessary to implement the test.Hopefully this will be useful for testing other aspects of ECDSA, or potentially ensuring that the scalars of an ECDSA signature are in-range generically, even if no curve arithmetic backend is available.