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Rollup of small fixes#5521

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randombit wants to merge 21 commits intomasterfrom
jack/fix-rollup
Open

Rollup of small fixes#5521
randombit wants to merge 21 commits intomasterfrom
jack/fix-rollup

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randombit added 21 commits April 3, 2026 22:58
Sadly SHA-1 seems to be still quite common in this ecosystem.
This would later cause an exception but one rather more opauqe as to
the source, so just reject it right away.
This would accept invalid inputs and then fail in more opaque ways later.
This is only used for TLS session data so not likely to occur in practice.
Fixes Limbo rfc5280::nc::permitted-self-issued which was marked xfail
…xcluded name

If the SAN is a wildcard, and that wildcard could match some specific excluded
name, then the certificate could be used to match against the excluded name, and
so should be rejected. RFC 5280 is somewhere between ambigous and silent about
this situation.
Since the multiplication occurs against the base point this can only
happen if the caller passed zero as the scalar.
The code poisoned the buffer then loaded the input into it, which
would cause valgrind to treat the data as initialized.
Would cause incorrect MAC to be computed with probability ~1/2**85.
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