Have you considered using the System.Security.Cryptography HMAC instead of the Mentalis HMAC? This requires about 8 lines of change (just the types, essentially) and would provide x86-64 and Mono compatibility.
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Have you considered using the System.Security.Cryptography HMAC instead of the Mentalis HMAC? This requires about 8 lines of change (just the types, essentially) and would provide x86-64 and Mono compatibility.