โšก ๐Ÿ”’ OpenSSL Command Generator
CRYPTOGRAPHY SUITE โ€ข TLS/SSL COMPLIANCE BUILDER

๐Ÿ”’ OpenSSL Command & CSR Generator

Construct verified OpenSSL CLI commands for Certificate Signing Requests (CSR), self-signed TLS certificates, Subject Alternative Names (SAN), and PKCS#12 bundle conversions.


          


          

            

              
              
            

            

          

        

      

    
        


        
        

          
          

            

              ๐Ÿ›ก๏ธ Architectural Overview: Public Key Infrastructure (PKI) & TLS Governance
            

            

              Transport Layer Security (TLS 1.3) and Public Key Infrastructure (PKI) underpin all authenticated web communications. Generating Certificate Signing Requests (CSR) and configuring internal self-signed TLS certificates for development, staging, and microservice service meshes (such as Istio, Envoy, or Consul) requires precise OpenSSL command orchestration. Modern web browser engines (Google Chrome, Firefox, Safari) mandatorily enforce Subject Alternative Name (SAN) validation, rejecting legacy certificates relying solely on Common Name (CN) attributes. WebDevWorker's OpenSSL Command Generator formats verified terminal commands compliant with modern X.509 v3 standards with zero client credential transmission.
            

          


          
          

            

              ๐Ÿ“ Mathematical RSA / ECC Asymmetric Cryptographic Specification
            

            

RSA Key Pair Mathematical Derivation:
1. Select large prime numbers p, q where p โ‰  q.
2. Modulus: n = p ร— q.
3. Euler's Totient: ฯ†(n) = (p - 1)(q - 1).
4. Public Exponent: e = 65537 (standard 2^{16} + 1).
5. Private Exponent: d โ‰ก e^{-1} (mod ฯ†(n)).

Security Strength:
2048-bit RSA โ‰ˆ 112 bits of symmetric security.
4096-bit RSA โ‰ˆ 128 bits of symmetric security.
Signature Algorithm: SHA-256 with RSA Encryption (sha256WithRSAEncryption).
            

          


          
          

            

              ๐Ÿ’ป Production Nginx & Apache Reverse Proxy SSL Configuration
            

            
# Nginx SSL Termination with Generated Certificate
server {
    listen 443 ssl http2;
    server_name api.mycompany.com;

    ssl_certificate /etc/ssl/certs/api.mycompany.com.crt;
    ssl_certificate_key /etc/ssl/private/api.mycompany.com.key;

    ssl_protocols TLSv1.2 TLSv1.3;
    ssl_ciphers ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES128-GCM-SHA256;
    ssl_prefer_server_ciphers off;
    ssl_session_timeout 1d;
    ssl_session_cache shared:SSL:10m;

    location / {
        proxy_pass http://127.0.0.1:3000;
        proxy_set_header Host $host;
        proxy_set_header X-Forwarded-Proto https;
    }
}

          


          
          

            

              ๐Ÿ“‹ Step-by-Step Certificate Generation & Installation Guide
            

            
    
              
    
  1. 
      Step 1: Select your required operation (CSR for public CA purchase or Self-Signed for internal staging).
    
    2. 
  
    
  2. 
      Step 2: Enter your Fully Qualified Domain Name (FQDN) as the Common Name.
    
    3. 
  
    
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      Step 3: Specify any additional subdomains or IP addresses in the Subject Alternative Names (SAN) field.
    
    4. 
  
    
  4. 
      Step 4: Copy the generated OpenSSL command and execute it directly within your secure terminal.
    
    5. 
  
    
  5. 
      Step 5: Store your private key (.key) with restricted 0600 file permissions and upload the CSR to your Certificate Authority.
    
    6. 
  
            

          


          
          

            

              โ“ Frequently Asked Questions (FAQ)
            

            

              
    

      

        
          Why do modern browsers reject certificates without Subject Alternative Names (SANs)?
        
        

          RFC 2818 and CA/Browser Forum baseline requirements officially deprecated Common Name matching. Browsers mandate SAN extensions to authenticate the exact DNS hostnames and IP addresses.
        

      

    

  
    

      

        
          What is the difference between a CSR and a Certificate (.crt)?
        
        

          A CSR (Certificate Signing Request) contains your public key and organization identity sent to a Certificate Authority (CA) to be cryptographically signed. The certificate is the signed output.
        

      

    

  
    

      

        
          Why is the -nodes parameter used in OpenSSL commands?
        
        

          The -nodes (no DES) flag prevents encrypting the private key with a passphrase. In production server environments, unpassphrased keys allow Nginx and Apache to reboot automatically without manual human intervention.
        

      

    

  
    

      

        
          What key size should I select for production TLS?
        
        

          2048-bit RSA is the current industry minimum. For high-security banking, healthcare, or government compliance, 4096-bit RSA or ECDSA (secp384r1) is recommended.
        

      

    

  
    

      

        
          How do I convert PEM certificates for use in IIS or Azure?
        
        

          Select the PKCS#12 conversion mode. It combines your .crt and .key into a single encrypted .pfx file importable into Windows Server IIS.
        

      

    

  
    

      

        
          Are my domain names or private keys uploaded to WebDevWorker?
        
        

          Never. WebDevWorker runs entirely in your local browser sandbox. The commands are generated locally without any server logging.
        

      

    

  
            

          


          
          

            

              โš ๏ธ Production Best Practices & Security Anti-Patterns
            

            
    
              
    
  • 1. Always protect generated private keys with chmod 600 keyfile.key permissions on production Linux servers.
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  • 2. Always include both apex domain (example.com) and wildcard (*.example.com) in Subject Alternative Names.
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  • 3. Never commit private keys (.key) to version control systems like GitHub or GitLab.
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