RFC 5480, "Elliptic Curve Cryptography Subject Public Key Information", March 2009

Errata ID: 6670
Status: Verified
Type: Technical
Publication Format(s) : TEXT
Reported By: Corey Bonnell
Date Reported: 2021-08-31
Verifier Name: Benjamin Kaduk
Date Verified: 2021-09-01

Section 3 says:

   If the keyUsage extension is present in a certificate that indicates
   id-ecDH or id-ecMQV in SubjectPublicKeyInfo, then the following
   values MUST NOT be present:

     digitalSignature;
     nonRepudiation;
     keyTransport;
     keyCertSign; and
     cRLSign.

It should say:

   If the keyUsage extension is present in a certificate that indicates
   id-ecDH or id-ecMQV in SubjectPublicKeyInfo, then the following
   values MUST NOT be present:

     digitalSignature;
     nonRepudiation;
     keyEncipherment;
     keyCertSign; and
     cRLSign.

Notes:

"keyTransport" KU bit name does not exist; I believe "keyEncipherment" is intended here instead.

While RFC 8813 makes it clear that "keyEncipherment" and "dataEncipherment" are prohibited, I'm marking this erratum as "Technical" due the reference to a non-existent bit name.

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