{"record":{"id":"2d4b0c33397d1be5","repo":"hashicorp/nomad","slug":"error-marshaling-ecdsa-private-key-s","errorCode":null,"errorMessage":"error marshaling ECDSA private key: %s","messagePattern":"error marshaling ECDSA private key: (.+?)","errorType":"exception","errorClass":null,"httpStatus":null,"severity":"error","filePath":"helper/tlsutil/generate.go","lineNumber":45,"sourceCode":"\ts, err := rand.Int(rand.Reader, l)\n\tif err != nil {\n\t\treturn nil, err\n\t}\n\treturn s, nil\n}\n\n// GeneratePrivateKey generates a new ecdsa private key\nfunc GeneratePrivateKey() (crypto.Signer, string, error) {\n\tcurve := elliptic.P256()\n\n\tpk, err := ecdsa.GenerateKey(curve, rand.Reader)\n\tif err != nil {\n\t\treturn nil, \"\", fmt.Errorf(\"error generating ECDSA private key: %s\", err)\n\t}\n\n\tbs, err := x509.MarshalECPrivateKey(pk)\n\tif err != nil {\n\t\treturn nil, \"\", fmt.Errorf(\"error marshaling ECDSA private key: %s\", err)\n\t}\n\n\tpemBlock, err := pemEncodeKey(bs, \"EC PRIVATE KEY\")\n\tif err != nil {\n\t\treturn nil, \"\", err\n\t}\n\n\treturn pk, pemBlock, nil\n}\n\nfunc pemEncodeKey(key []byte, blockType string) (string, error) {\n\tvar buf bytes.Buffer\n\n\tif err := pem.Encode(&buf, &pem.Block{Type: blockType, Bytes: key}); err != nil {\n\t\treturn \"\", fmt.Errorf(\"error encoding private key: %s\", err)\n\t}\n\treturn buf.String(), nil\n}","sourceCodeStart":27,"sourceCodeEnd":63,"githubUrl":"https://github.com/hashicorp/nomad/blob/482b49bf1aec006f089bcfc7e632d8f6ac303e5e/helper/tlsutil/generate.go#L27-L63","documentation":"After generating an ECDSA key, GeneratePrivateKey serializes it with x509.MarshalECPrivateKey to SEC1/ASN.1 DER. If marshaling fails (the key doesn't conform to the expected curve encoding), this wrapped error is returned. With P-256 keys this should essentially never happen.","triggerScenarios":"x509.MarshalECPrivateKey(pk) fails inside GeneratePrivateKey, e.g. when the key uses a curve lacking an OID or a corrupted/nil key structure.","commonSituations":"Custom curves or non-standard key values passed in; Go crypto/x509 edge cases; practically only seen when the generator is modified to use unusual curves.","solutions":["Keep using the library's default P-256 curve so marshaling succeeds.","Upgrade Go to a current version in case of an x509 package bug.","Check the error string for the underlying x509 reason and address the key parameters accordingly."],"exampleFix":null,"handlingStrategy":"try-catch","validationCode":null,"typeGuard":null,"tryCatchPattern":"signer, pemKey, err := tlsutil.GeneratePrivateKey()\nif err != nil {\n    if strings.Contains(err.Error(), \"error marshaling ECDSA private key\") {\n        // regenerate; investigate x509/Go version if persistent\n        return fmt.Errorf(\"key marshal failed: %w\", err)\n    }\n    return err\n}","preventionTips":["Stick to the default P-256 curve.","Keep the Go toolchain/runtime up to date.","Log the wrapped underlying error for diagnosis."],"tags":["tls","cryptography","x509"],"backgroundTag":"key-marshaling-failed","analyzedSha":"482b49bf1aec006f089bcfc7e632d8f6ac303e5e","analyzedAt":"2026-09-04T07:54:14.808Z","contentChangedAt":"2026-09-04T07:54:14.808Z","schemaVersion":2},"datasetVersion":"2026-09-08T10:18:20.063Z"}