Counterpoint: Since the government can compel you to testify about facts (without self-incrimination), compelled code-signing may not be a 1st amendment violation.
One could posit that code-signing is solely Apple stating that a given sequence of bytes has not been subsequently modified. You might even view Apple's EULA - that includes "AS IS" clauses disclaiming warranty and fitness for purpose - as supporting this interpretation.
One could posit that code-signing is solely Apple stating that a given sequence of bytes has not been subsequently modified. You might even view Apple's EULA - that includes "AS IS" clauses disclaiming warranty and fitness for purpose - as supporting this interpretation.