Articles about openssl | UserComp.com

Generating OpenVPN TLS-Crypt Key with OpenSSL

Generate a 256-bit ta.key file to encrypt OpenVPN TLS handshakes and hide VPN usage from network observers.

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P12 Certificate Authentication

Solves secure VPN client authentication by bundling private keys and certificates into encrypted PKCS#12 files for IPsec and OpenVPN.

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OSSL Cipher Unpad Block: Bad Decrypt Error in Red Hat Script

Resolve OSSL_CIPHER_UNPAD_BAD_DECRYPT errors in Red Hat scripts by verifying key integrity, checking for file corruption during transfer, and ensuring correct IV usage.

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Get Certificate Expiry Date in Unix Time Format

Convert an SSL certificate's expiration date to a Unix timestamp for scripting and monitoring on Linux, macOS, or BSD.

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How to Show Output in OpenSSL When Decrypting with a Wrong Password

Resolve missing decrypted output when using wrong passwords by capturing stderr and checking exit codes instead of expecting plaintext.

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Easily Creating a Req File with Easy-RSA for SSL Certificate

Generate SSL certificate signing requests using Easy-RSA to automate PKI setup and avoid complex OpenSSL syntax.

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How to Avoid Requesting Instructions with OpenSSL Config File in Tech Support

Resolve interactive OpenSSL prompts during CSR generation by using the -subj flag or a configuration file for automated, consistent certificate requests.

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SSH and OpenSSL: Decrypting RSA Private Keys with ssh-add and openssl pkeyutl

Resolve confusion about decrypting RSA keys by clarifying that ssh-add loads unencrypted keys into memory and providing OpenSSL commands to encrypt or remove passphrases from key files.

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How to Set Length of Certificate Serial Number Explicitly?

Control certificate serial number encoding size by manually editing the CA index file or using the -set_serial flag with a specific integer value.

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Debug Folder No Permission in Kali Linux for OpenSSL Programs

Resolve OpenSSL permission denied errors in Kali Linux by changing debug folder ownership using chown.

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PHP OpenSSL Encode/Decode Multiple String

Resolve PHP OpenSSL decryption failures by storing unique IVs with ciphertext for each string.

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Maintaining CentOS 7 Past EOL: Using Vault Repos for Yum Config, Troubleshooting OpenSSL and OpenJDK Package Installations

Resolve yum failures and package dependency errors on EOL CentOS 7 by migrating to Vault repositories.

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How to Update OpenSSL to 3.1.1 from 1.0.2n in Node.js

Resolve outdated OpenSSL 1.0.2n in Node.js by upgrading the runtime to a supported LTS version that bundles secure cryptographic libraries.

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Postfix 3.7 and OpenSSL 3: Configuring DH Parameters

Resolve Postfix 3.7 TLS failures with OpenSSL 3 by configuring explicit Diffie-Hellman parameters to ensure secure mail server connections.

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Converting Encrypted RSA Private Key to Unencrypted Format using OpenSSL 3.3.0 on Mac

Remove passphrase protection from an encrypted RSA private key on macOS using OpenSSL 3.3.0 to enable automated script usage.

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Configuring OpenSSL: Copying email SubjectAltName from openssl.cnf

Resolve missing email SubjectAltName in CSRs by adding copy_extensions = copyall to the [v3_req] section of openssl.cnf.

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OpenSSL ECDSA Signature Issue: Different Results Using Two Different Methods

Resolve confusion over differing ECDSA signature outputs by explaining that standard ECDSA uses random nonces, making identical inputs produce different valid signatures.

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Exporting CRT File Certificates using OpenSSL in Windows DOS Prompt

Convert Windows DER format certificates to standard PEM format using OpenSSL in the Windows DOS prompt.

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Creating a Certificate Authority for Internal Network

Establishes a local Certificate Authority to issue trusted SSL/TLS certificates for internal network services, eliminating security warnings and enabling mutual TLS authentication.

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Resolving 'libssl.so.3: not openshared object file: No such file or directory' while compiling OpenSSL

Fix corrupted or incompatible libssl.so.3 errors during OpenSSL compilation by verifying file integrity, cleaning the build environment, and ensuring correct library paths.

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Exporting non-exportable private key for .cer from Windows Certificate Manager

Non-exportable private keys cannot be extracted from Windows Certificate Manager; you must re-issue the certificate on the target machine to generate a new key pair.

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