p521: initial ecdsa support with FIPS 186-4 test vectors#956
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Initial `ecdsa` feature and test vectors to ensure it's working.
Due to P-521's unusual modulus size, we can't use the upstream
`ecdsa::{SigningKey, VerifyingKey}` types (although we are able to use
the generic implementation of ECDSA). The `ecdsa` crate currently
includes bounds for the digest size in several places, including the
RFC6979 implementation, which are incompatible with P-521, which uses a
66-byte serialized scalar size along with SHA-521, which emits a 64-byte
digest.
To work around this, newtypes for `SigningKey` and `VerifyingKey` have
been added. They largely wrap the inner types, but don't use RFC6979 and
instead randomly generate `R` each time signing is performed (using an
on-by-default `getrandom` feature which enables `rand_core::OsRng`).
FIPS 186-4 test vectors adapted from `SigGen.txt` in
`186-4ecdsatestvectors.zip` from:
https://csrc.nist.gov/projects/cryptographic-algorithm-validation-program/digital-signatures
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Initial
ecdsafeature and test vectors to ensure it's working.Due to P-521's unusual modulus size, we can't use the upstream
ecdsa::{SigningKey, VerifyingKey}types (although we are able to use the generic implementation of ECDSA). Theecdsacrate currently includes bounds for the digest size in several places, including the RFC6979 implementation, which are incompatible with P-521, which uses a 66-byte serialized scalar size along with SHA-521, which emits a 64-byte digest. Fixing that will require breaking changes to theecdsacrate.To work around this, newtypes for
SigningKeyandVerifyingKeyhave been added. They largely wrap the inner types, but don't use RFC6979 and instead randomly generateReach time signing is performed (using an on-by-defaultgetrandomfeature which enablesrand_core::OsRng).FIPS 186-4 test vectors adapted from
SigGen.txtin186-4ecdsatestvectors.zipfrom:https://csrc.nist.gov/projects/cryptographic-algorithm-validation-program/digital-signatures
cc @MasterAwesome