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RFC 5915, "Elliptic Curve Private Key Structure", June 2010

Source of RFC: IETF - NON WORKING GROUP
Area Assignment: sec
See Also: RFC 5915 w/ inline errata

Errata ID: 3962
Status: Verified
Type: Technical
Publication Format(s) : TEXT
Reported By: Jim Schaad
Date Reported: 2014-04-14
Verifier Name: Kathleen Moriarty
Date Verified: 2015-03-24

Section 3 and A says: 

   ECPrivateKey ::= SEQUENCE {
     version        INTEGER { ecPrivkeyVer1(1) } (ecPrivkeyVer1),
     privateKey     OCTET STRING,
     parameters [0] ECParameters {{ NamedCurve }} OPTIONAL,
     publicKey  [1] BIT STRING OPTIONAL
   }

It should say:

   ECPrivateKey ::= SEQUENCE {
     version        INTEGER { ecPrivkeyVer1(1) } (ecPrivkeyVer1),
     privateKey     OCTET STRING,
     parameters [0] ECParameters  OPTIONAL,
     publicKey  [1] BIT STRING OPTIONAL
   }

Notes:

ECParameters is not a parametrized type. This means that it cannot be used as a parameterized type by passing in the NamedCurve set as a parameter.

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