Compute tau' in the same way as signature-key-blinding #27
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This change increases interoperability with draft-irtf-cfrg-signature-key-blinding-07. In that draft, the message for hash_to_field is tau || 0x00 || info, and the DST is a string such as "ECDSA Key Blind".
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This change increases interoperability with draft-irtf-cfrg-signature-key-blinding-07. In that draft, the message for
hash_to_fieldistau || 0x00 || info, and theDSTis a static string such as"ECDSA Key Blind".See for the interoperability issue draft-dijkhuis-cfrg-hdkeys-05: § 3.2. After this fix,
DeriveBlindingFactorin HDK is compatible with the computation oftau'in the ARKG key blinding functions.