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Guided CSR generation for Windows and Linux, built around ECC P-384 and SHA-256, with pre-submission checks for outdated server stacks and common failure patterns.

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
Mode: CSR guidance 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.

Certificate request details

Comma-separated DNS names. CN will be added to SAN 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.
C
ECC CSR Decoder

ECC CSR Decoder

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

All decoding is performed locally in your browser. No data is sent to any server.

Post-Deployment Validation

Purpose Use 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

Rule Current threshold Purpose
ECC profile P-384 / secp384r1 / SHA-256 Normalises all generated guidance to the target ECC profile.
Windows baseline Server 2012+ Warns when Windows looks too old for reliable ECC workflows.
IIS baseline IIS 8.0+ Warns when IIS looks too old for smooth ECC request handling and deployment.
CentOS baseline CentOS 7+ Warns when Linux stack likely carries outdated crypto libraries.
OpenSSL baseline 1.1.1+ Checks library age against your known issue pattern.
Apache baseline 2.4.54+ Checks web server age against your known issue pattern.
XAMPP baseline 7.4.33+ Checks bundled stack age against your known issue pattern.
PHP baseline 7.4.33+ Checks bundled stack age against your known issue pattern.

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.
Manual alignment note: the attached document lists ECC/ECDSA with P-384 and SHA-256, Windows Server 2016+ for IIS, and OpenSSL 1.1.1+ for Nginx and Apache. :contentReference[oaicite:1]{index=1}