{"record":{"id":"fd50c3d8f1fe0ad0","repo":"hyperledger/fabric","slug":"failed-parsing-certificate-s","errorCode":null,"errorMessage":"failed parsing certificate %s","messagePattern":"failed parsing certificate (.+?)","errorType":"exception","errorClass":null,"httpStatus":null,"severity":"error","filePath":"common/crypto/sanitize.go","lineNumber":49,"sourceCode":"\tfinalPEM, err := SanitizeX509Cert(sID.IdBytes)\n\tif err != nil {\n\t\treturn nil, err\n\t}\n\n\tsID.IdBytes = finalPEM\n\n\treturn proto.Marshal(sID)\n}\n\n// SanitizeX509Cert sanitizes an X.509 certificate to ensure that the ECDSA signature uses a \"low-S\" value.\nfunc SanitizeX509Cert(initialPEM []byte) ([]byte, error) {\n\tder, _ := pem.Decode(initialPEM)\n\tif der == nil {\n\t\treturn nil, errors.Errorf(\"failed to PEM decode identity bytes: %s\", string(initialPEM))\n\t}\n\tcert, err := x509.ParseCertificate(der.Bytes)\n\tif err != nil {\n\t\treturn nil, errors.Wrapf(err, \"failed parsing certificate %s\", string(initialPEM))\n\t}\n\n\tr, s, err := utils.UnmarshalECDSASignature(cert.Signature)\n\tif err != nil {\n\t\treturn nil, errors.Wrapf(err, \"failed unmarshaling ECDSA signature on identity: %s\", string(initialPEM))\n\t}\n\n\t// We assume that the consenter and the CA use the same signature scheme.\n\tcurveOrderUsedByCryptoGen := cert.PublicKey.(*ecdsa.PublicKey).Curve.Params().N\n\thalfOrder := new(big.Int).Rsh(curveOrderUsedByCryptoGen, 1)\n\t// Low S, nothing to do here!\n\tif s.Cmp(halfOrder) != 1 {\n\t\treturn initialPEM, nil\n\t}\n\t// Else it's high-S, so shift it below half the order.\n\ts.Sub(curveOrderUsedByCryptoGen, s)\n\n\tvar newCert certificate","sourceCodeStart":31,"sourceCodeEnd":67,"githubUrl":"https://github.com/hyperledger/fabric/blob/2736b63f8fd5932511d56fe68b7039d15977f7f6/common/crypto/sanitize.go#L31-L67","documentation":"After PEM decoding, SanitizeX509Cert parses the DER bytes with x509.ParseCertificate. A failure (wrapped as 'failed parsing certificate %s') means the PEM block exists but its contents are not a valid X.509 certificate.","triggerScenarios":"PEM block containing a private key, CSR, or truncated/garbage DER passed to SanitizeX509Cert (or via SanitizeIdentity's IdBytes); certificates with unsupported algorithms or corrupted encodings.","commonSituations":"Config mistakenly referencing the key file where a cert is expected; truncated cert files from failed downloads/mounts; exotic CA certificates using formats Go's x509 parser rejects; CRLF/binary corruption during file transfer.","solutions":["Verify the PEM block is Type CERTIFICATE and its DER parses (openssl x509 -in cert.pem -text -noout)","Check the wrapped inner error for the exact ASN.1 parse problem","Re-export/re-download the certificate from the CA; compare file sizes/checksums","If using an unusual CA cert, convert/re-issue with standard algorithms (ECDSA/RSA, standard extensions)"],"exampleFix":null,"handlingStrategy":"validation","validationCode":"func parsesAsX509(pemBytes []byte) error {\n    blk, _ := pem.Decode(pemBytes)\n    if blk == nil { return errors.New(\"not PEM\") }\n    _, err := x509.ParseCertificate(blk.Bytes)\n    return err\n}","typeGuard":null,"tryCatchPattern":"out, err := crypto.SanitizeX509Cert(pemBytes)\nif err != nil && strings.Contains(err.Error(), \"failed parsing certificate\") {\n    // inspect wrapped error, re-export cert from CA\n}","preventionTips":["Validate all certs with openssl x509 -text during deployment","Distribute certs with checksums and verify after transfer","Standardize on common algorithms/CA software Go's x509 handles well"],"tags":["x509","certificate","asn1","hyperledger-fabric"],"backgroundTag":"certificate-parse-failed","analyzedSha":"2736b63f8fd5932511d56fe68b7039d15977f7f6","analyzedAt":"2026-09-04T08:52:36.465Z","contentChangedAt":"2026-09-04T08:52:36.465Z","schemaVersion":2},"datasetVersion":"2026-09-08T15:18:49.778Z"}