OpenSSL Certificate Manager

Complete Guide & Documentation

Built with ❤️ by

🔒 Security & Privacy - 100% Safe
VERIFIED SECURE

Client-Side Processing

All certificate operations are performed locally in your browser. No data is sent to external servers.

Zero Data Storage

We don't store, log, or transmit your certificates or private keys anywhere. Your data stays with you.

Open Source Standards

Uses standard cryptographic libraries and OpenSSL-compatible operations. Industry-standard security.

Real-time Processing

Instant certificate generation and analysis without any server delays. Lightning fast & secure.

🚀 Application Features

Generate

  • • RSA & EC key pairs
  • • Certificate Signing Requests
  • • Self-signed certificates
  • • Custom validity periods

Convert

  • • PEM ↔ DER conversion
  • • PFX/P12 bundling
  • • CRT/CER formats
  • • Batch processing

Analyze

  • • Certificate inspection
  • • Expiration validation
  • • Extension analysis
  • • Chain verification

CA Tools

  • • Create Certificate Authority
  • • Sign CSRs
  • • Generate CRLs
  • • CA management
💻 OpenSSL Commands Reference

Key Generation

# Generate RSA private key
openssl genpkey -algorithm RSA -pkcs8 -pkeyopt rsa_keygen_bits:2048 -out private.key
# Generate EC private key
openssl genpkey -algorithm EC -pkeyopt ec_paramgen_curve:P-256 -out private.key

Certificate Signing Request

# Create CSR
openssl req -new -key private.key -out request.csr \
-subj "/CN=example.com/O=My Company/C=US"

Self-Signed Certificate

# Generate self-signed certificate
openssl req -x509 -newkey rsa:2048 -keyout private.key \
-out certificate.crt -days 365 -nodes \
-subj "/CN=example.com/O=My Company/C=US"

Format Conversion

# PEM to DER
openssl x509 -in cert.pem -outform DER -out cert.der
# Create PFX bundle
openssl pkcs12 -export -out cert.pfx -inkey private.key -in cert.pem

Certificate Analysis

# View certificate details
openssl x509 -in certificate.crt -text -noout
# Check certificate expiration
openssl x509 -in certificate.crt -noout -dates
⚡ Best Practices & Security Guidelines

🔐 Private Key Security

  • Never share private keys via email or unsecured channels
  • Use strong passwords for PFX/P12 files
  • Store private keys in secure, encrypted storage
  • Use hardware security modules (HSMs) for production

📋 Certificate Management

  • Monitor certificate expiration dates
  • Verify certificate chains before deployment
  • Test certificates in staging environments
  • Keep backup copies of certificates and keys
📁 Supported Certificate Formats

PEM

Privacy-Enhanced Mail

Base64 encoded, human readable format with headers

DER

Distinguished Encoding Rules

Binary format, compact and efficient

PFX/P12

PKCS#12

Password-protected bundle format

CRT/CER

Certificate Files

Standard certificate formats

⚙️ Technical Implementation

🛠️ Technology Stack

  • • Next.js 15 with App Router
  • • React 18 with TypeScript
  • • Tailwind CSS for styling
  • • shadcn/ui component library
  • • Web Crypto API for security

🔧 Core Features

  • • Client-side cryptographic operations
  • • OpenSSL command compatibility
  • • Real-time certificate validation
  • • Responsive design for all devices
  • • Dark/Light theme support

🌟 Why This Tool is Special

100% Secure

All operations happen in your browser

Lightning Fast

No server delays or waiting times

User Friendly

Beautiful interface with guided workflows

Built with ❤️ by Ahmad Raza