gistfile1.txt

obiwan-[minerva-voucher/data/00-D0-E5-F2-00-02](3.3.8) mcr 10493 %dumpasn1 key.pkcs8.der 
  0 135: SEQUENCE {
  3   1:   INTEGER 0
  6  19:   SEQUENCE {
  8   7:     OBJECT IDENTIFIER ecPublicKey (1 2 840 10045 2 1)
 17   8:     OBJECT IDENTIFIER prime256v1 (1 2 840 10045 3 1 7)
       :     }
 27 109:   OCTET STRING, encapsulates {
 29 107:     SEQUENCE {
 31   1:       INTEGER 1
 34  32:       OCTET STRING
       :         11 CD 87 AA FC 41 17 AF 46 EA 3E B4 49 81 25 E1
       :         63 40 A7 FA 6E 91 40 FF D3 46 A2 5B 6F FB DB 0D
 68  68:       [1] {
 70  66:         BIT STRING
       :           04 03 A3 75 43 87 B3 7C C0 0A 9A 87 9C AD F6 F4
       :           38 13 1C D4 0C 84 1F E0 40 4E 41 79 F0 5B 13 4B
       :           20 71 B3 44 9B 49 62 F1 16 30 CE BB 00 7D 80 B1
       :           A7 D9 3B 13 50 9B A6 27 A5 4F C3 96 7F 4C FE 21
       :           27
       :         }
       :       }
       :     }
       :   }


obiwan-[ring/worktree/ec-key-load](3.3.8) mcr 10486 %dumpasn1 src/data/alg-ec-dsa.der 
  0  19: SEQUENCE {
  2   7:   OBJECT IDENTIFIER ecPublicKey (1 2 840 10045 2 1)
 11   8:   OBJECT IDENTIFIER prime256v1 (1 2 840 10045 3 1 7)
       :   }
       
RFC5208 and RFC5958:     

      AlgorithmIdentifier: A type that identifies an algorithm (by
      object identifier) and any **associated parameters**.  This type is
      defined in [X.509].

(** mine)

-- Private-key information syntax

PrivateKeyInfo ::= SEQUENCE {
   version Version,
   privateKeyAlgorithm AlgorithmIdentifier {{PrivateKeyAlgorithms}},
   privateKey PrivateKey,
   attributes [0] Attributes OPTIONAL }
   
RFC5912 seems to define:

AlgorithmIdentifier{ALGORITHM-TYPE, ALGORITHM-TYPE:AlgorithmSet} ::=
        SEQUENCE {
            algorithm   ALGORITHM-TYPE.&id({AlgorithmSet}),
            parameters  ALGORITHM-TYPE.
                   &Params({AlgorithmSet}{@algorithm}) OPTIONAL
        }