return nil, errors.New("x509: inner and outer signature algorithm identifiers don't match")
	}
	sigAI, err := parseAI(sigAISeq)
	if err != nil {
		return nil, err
	}
	cert.SignatureAlgorithm = getSignatureAlgorithmFromAI(sigAI)

	var issuerSeq cryptobyte.String
	if !tbs.ReadASN1Element(&issuerSeq, cryptobyte_asn1.SEQUENCE) {
		return nil, errors.New("x509: malformed issuer")
	}
	cert.RawIssuer = issuerSeq

	SaltLength   int                      `asn1:"explicit,tag:2"`
	TrailerField int                      `asn1:"optional,explicit,tag:3,default:1"`
}

func getSignatureAlgorithmFromAI(ai pkix.AlgorithmIdentifier) SignatureAlgorithm {
	if ai.Algorithm.Equal(oidSignatureEd25519) {
		// RFC 8410, Section 3
		// > For all of the OIDs, the parameters MUST be absent.