p521: switch to upstream RFC6979-based ECDSA#1016
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Now that RustCrypto/signatures#773 and RustCrypto/signatures#774 have landed it should be possible to use the upstream RFC6979 implementation from the `ecdsa` crate in conjunction with `p521`, which uses a Digest with a 64-byte output, but uses 66-byte field elements.
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Now that RustCrypto/signatures#773 and RustCrypto/signatures#774 have landed it should be possible to use the upstream RFC6979 implementation from the
ecdsacrate in conjunction withp521, which uses a Digest with a 64-byte output, but uses 66-byte field elements.This required some upstream changes to the
rfc6979crate but is now working: RustCrypto/signatures#781