ECC CSR Assistant & CSR Decoder

Guided CSR generation for Windows and Linux, built around ECC P-384 and SHA-256, with pre-submission checks for outdated server stacks, clean operator output, and a browser-side ECC CSR decoder.

Permanent reminder: do not submit CSR content by copying it through UI, email, PDF, or chat applications. Use the original generated file whenever possible.
Environment health score
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Generate a result to assess the environment.
ECC: P-384
Hash: SHA-256
Scope: ECC CSR only
Quick posture
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Environment and server stack

Only server-specific fields appear when relevant. For example, IIS fields are hidden when Linux is selected.

ECC CSR request details

Comma-separated DNS names and IP entries. Use prefixes like IP:192.0.2.10 when needed. CN will be added automatically if missing.

Generated output

Important This page gives script output and guidance only. Run the script on the target server or on an approved admin workstation.
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ECC CSR Decoder

ECC CSR Decoder

Decode and inspect ECC Certificate Signing Requests only. Accepted input: PEM CSR or DER CSR.

This decoder does not accept certificates. It is limited to ECC CSR testing.
All decoding is performed locally in your browser. No data is sent to any server.

Post-Deployment Validation

PurposeUse this section after the certificate has been installed and bound, to verify that the service is actually presenting the correct certificate and chain.

Built-in knowledge bank

RuleCurrent thresholdPurpose
ECC profileP-384 / secp384r1 / SHA-256Normalises all generated guidance to the target ECC profile.
Windows baselineServer 2012+Warns when Windows looks too old for reliable ECC workflows.
IIS baselineIIS 8.0+Warns when IIS looks too old for smooth ECC request handling and deployment.
CentOS baselineCentOS 7+Warns when Linux stack likely carries outdated crypto libraries.
OpenSSL baseline1.1.1+Checks library age against the expected ECC path.
Apache baseline2.4.54+Checks web server age against the expected ECC path.
XAMPP baseline7.4.33+Checks bundled stack age against the expected ECC path.
PHP baseline7.4.33+Checks bundled stack age against the expected ECC path.
CSR decoder policyECC onlyDecoder flags RSA and other non-ECC CSRs as policy failures.

Why this warning matters

Older cryptographic libraries are a common source of ECC request failure or inconsistent behaviour. If the stack is old, the command may run but the output may not meet the intended profile cleanly.
Older Windows Server and IIS stacks can make ECC request generation, storage provider handling, or later certificate binding harder than expected. This is why the app asks for both Windows and IIS versions.
Bundled platforms often carry multiple versions underneath. A problem might not be the visible application layer alone, but Apache, PHP, or OpenSSL sitting behind it.
Modern certificate use commonly expects Subject Alternative Names. Even if CN is present, SAN should be explicit so the request matches current hostname validation practice.
Internal note: this build is restricted to ECC CSR generation and ECC CSR decoding only.