X.509 Certificate (DER)
The binary DER encoding of the same certificate, for testing ASN.1/DER parsers, Java keystores, and DER-to-PEM converters. Published sample certificate, not a real identity.
| Field | Value |
|---|---|
| Type | X.509 certificate (DER, binary) |
| Subject | CN=sample.example, O=Novus Examples (Sample), C=US |
| Issuer | (self-signed) CN=sample.example |
| Serial | 5642823782587783233 |
| Valid from | 2026-01-01 |
| Valid to | 2036-01-01 |
| Public key | RSA 2048-bit |
| Signature | sha256WithRSAEncryption |
| SAN | sample.example, www.sample.example |
Specifications
- Format
- X.509 v3 (DER, binary)
- Subject
- CN=sample.example
- Key
- RSA 2048
- Note
- binary encoding of the PEM twin
- Sample Only
- true
Testing contract
Expected to pass- Scenario
- Exercise X.509 Certificate (DER) in its security workflow. The binary DER encoding of the same certificate, for testing ASN.1/DER parsers, Java keystores, and DER-to-PEM converters.
- Expected result
- subject=CN=sample.example,O=Novus Examples (Sample),C=US; issuer=CN=sample.example,O=Novus Examples (Sample),C=US; key bits=2048; validity=2026-01-01T00:00:00+00:00 to 2036-01-01T00:00:00+00:00. Declared feature checks: subject=CN=sample.example; key=RSA 2048.
What is a .der file?
DER (Distinguished Encoding Rules) is the binary encoding of an X.509 certificate (or other ASN.1 structure): the same data a PEM file Base64-wraps, without the text armour. A .der certificate is compact and byte-exact, common in Java keystores and Windows tooling.
How to use this file
Use an example .der certificate to test binary X.509 parsers, ASN.1 decoders, and DER-to-PEM converters, or to confirm a tool reads raw certificate bytes. Published sample certificate, not a real identity.
How to use this file for testing
“X.509 Certificate (DER)” is a deterministic Testaroo fixture for Certificate & key testing, Editor testing. Self-signed X.509 certificates (PEM, CRT, DER), a CSR, RSA and Ed25519 keys, an SSH public key, a PKCS#12 bundle, and an htpasswd file, all published sample-only material, for testing certificate parsers, TLS tooling, keystore importers, and PEM/DER decoders.
Documented properties for this file: X.509 v3 (DER, binary). Compare results against paired or grouped companions on this page when present (clean↔damaged, searchable↔scanned, or format twins) so scores stay reproducible across runs.
Download the file once, keep the path stable in CI or local scripts, and treat the spec table as the contract: dimensions, seeds, field lists, and roles are intentional. Corrupt or invalid samples are labelled as such, expect parsers to fail loudly rather than silently accept them.
Data fixtures document their exact quirks (delimiters, encodings, null handling, schema, and row counts) in the spec table. Point your parser or importer at the file and assert it handles the documented edge cases; clean and deliberately-messy siblings make before/after diffs straightforward.
This is a published, sample-only certificate/key. Parse it, verify the chain or signature, and test PEM↔DER conversion, never deploy it anywhere real.
Generated by generation/pki_security.py. Free for any use, no attribution required, license.
Related files
- csrCertificate Signing Request (CSR)A PKCS#10 certificate signing request (PEM) with the subject and SAN, self-signed by the RSA key to prove key possession, for testing CSR parsers and certificate-authority intake flows.
- keyEd25519 Private Key (PEM)An Ed25519 private key in PKCS#8 PEM, derived from a fixed seed: a published, sample-only modern elliptic-curve key for testing PEM parsers and Ed25519 tooling. Never use it for real.
- htpasswdhtpasswd (HTTP Basic Auth)An Apache/nginx .htpasswd file with two users hashed using the {SHA} scheme (Base64 SHA-1): the sample passwords are documented in the file, for testing Basic-Auth credential parsers and hash identification.
- keyRSA 2048 Private Key (PEM)A 2048-bit RSA private key in unencrypted PKCS#8 PEM: a deliberately PUBLISHED, sample-only key for testing PEM key parsers and PKCS#8 decoders. Never use it for anything real.
- pubSSH Public Key (Ed25519)An OpenSSH-format Ed25519 public key (the shareable half of the key pair): a single line of algorithm, Base64 key blob, and comment, for testing SSH public-key parsers and authorized_keys tooling.
- p12PKCS#12 Bundle (.p12)A PKCS#12 (.p12/PFX) bundle packaging the sample RSA key and certificate together, protected with the sample password 'novus-sample', for testing keystore importers and PKCS#12 parsers. (The PKCS#12 MAC salt is random, so this file is intentionally not byte-stable.)
