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Version 2 cherry-picks #267
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Fixes issue #228. After calling ScalarMult for P-521, the output can sometimes be 65 bytes long instead of 66 bytes. This happens when the first bit of the computed value is zero. Calling z.Bytes() on the big integer will then omit the leading zero, giving us a 65-byte value. This subsequently causes the shared secret computation to be incorrect as the input into the KDF function should always be 66 bytes which is the full length for a P-521 coordinate value.
In #210 I introduced some error messages for incorrect octet string length for X and Y. The error message for the public key case incorrectly stated that it was for a private key.
mbyczkowski
approved these changes
Oct 22, 2019
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Cherry-picking bug fixes from master onto v2, for a v2.4.0 release, for #266.