{"record":{"id":"318a217c76fcf373","repo":"hashicorp/nomad","slug":"error-generating-ecdsa-private-key-s","errorCode":null,"errorMessage":"error generating ECDSA private key: %s","messagePattern":"error generating ECDSA private key: (.+?)","errorType":"exception","errorClass":null,"httpStatus":null,"severity":"error","filePath":"helper/tlsutil/generate.go","lineNumber":40,"sourceCode":")\n\n// GenerateSerialNumber returns random bigint generated with crypto/rand\nfunc GenerateSerialNumber() (*big.Int, error) {\n\tl := new(big.Int).Lsh(big.NewInt(1), 128)\n\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","sourceCodeStart":22,"sourceCodeEnd":58,"githubUrl":"https://github.com/hashicorp/nomad/blob/482b49bf1aec006f089bcfc7e632d8f6ac303e5e/helper/tlsutil/generate.go#L22-L58","documentation":"GeneratePrivateKey creates an ECDSA P-256 key using crypto/ecdsa with rand.Reader. If the OS entropy source or the elliptic-curve key generation fails, the error is wrapped with this message. Failure here is rare and usually indicates a system-level crypto/entropy problem.","triggerScenarios":"ecdsa.GenerateKey(elliptic.P256(), rand.Reader) returns an error when GeneratePrivateKey is called (directly or via GenerateCA/GenerateCert).","commonSituations":"Running in a sandbox/VM where /dev/urandom or getrandom(2) is unavailable; heavily restricted containers; exotic platforms with broken crypto/rand.","solutions":["Fix the underlying entropy source (ensure getrandom(2) or /dev/urandom works in the environment).","Retry the operation; entropy failures are often transient.","Run the workload on a platform/Go build with working crypto/rand support."],"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 generating ECDSA private key\") {\n        // log underlying cause; entropy/system issue; retry or fix environment\n        return fmt.Errorf(\"keygen failed: %w\", err)\n    }\n    return err\n}","preventionTips":["Ensure the runtime environment has a working entropy source.","Avoid exotic sandboxes/seccomp profiles blocking getrandom(2).","Retry transient generation failures."],"tags":["tls","cryptography","entropy"],"backgroundTag":"key-generation-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"}