Thanks for your support. MAC1 is a variant of HMAC. It makes use of the truncation as described in chapter 5 of FIPS-198 ( https://nvlpubs.nist.gov/nistpubs/FIPS/NIST.FIPS.198-1.pdf). This means in case of IEEE1609.2: HMAC<SHA256> is used, but the output tag is only the leftmost 128bits.
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