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Can anybody confirm this:
ASN.1 DER already requires that integers start with a zero bit if non-negative.
I looked from the ANS1 DER specification but didnt find anything about that.
“The contents octets shall be a two’s complement binary number equal to the integer value” says X.690, #8.3. This specifies what you seek.
In addition to that:
If the contents octets of an integer value encoding consist of more than one octet, then the bits of the first octet and bit 8 of the second octet:
a) shall not all be ones; and
b) shall not all be zero.
These rules ensure that an integer value is always encoded in the smallest possible number of octets.