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RFC 9580, "OpenPGP", July 2024

Source of RFC: openpgp (sec)
See Also: RFC 9580 w/ inline errata

Errata ID: 8454
Status: Verified
Type: Technical
Publication Format(s) : TEXT, PDF, HTML
Reported By: Tim Geiser
Date Reported: 2025-06-07
Verifier Name: Paul Wouters
Date Verified: 2025-06-13

Section 5.2.3 says: 

One or more MPIs comprising the signature. This portion is
algorithm specific.

It should say:

One or more MPIs comprising the signature, or plain octets with no
MPI header. This portion is algorithm specific.

Notes:

The final bullet point of 5.2.3 is not, strictly speaking, correct. Ed25519 and Ed448 have signatures that are not MPIs but rather "native" octet strings. These algorithms do not have "one or more MPIs" - they have zero MPIs and only the octet string (of length 64 or 114). Prior to the introduction of these algorithms that statement was correct - every other signature algorithm uses MPI(s).

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