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PRIVATE_KEY is available in Core 0.4.0 or newer.
PRIVATE_KEY is enabled by default in Rust, Python, Node.js, and browser WASM. It recognizes complete PEM blocks using these case-sensitive labels:
  • PRIVATE KEY
  • RSA PRIVATE KEY
  • EC PRIVATE KEY
  • DSA PRIVATE KEY
  • OPENSSH PRIVATE KEY
  • ENCRYPTED PRIVATE KEY
The matching -----BEGIN …----- and -----END …----- delimiters must each occupy an entire line. LF and CRLF line endings are supported. The body must contain nonempty Base64-shaped lines using ASCII letters, digits, +, /, and at most two trailing = characters. Its combined length must be divisible by four. Empty lines, spaces, tabs, and data after padding are rejected. This is lexical detection: it does not decode, decrypt, or validate the key. The deliberately synthetic body below demonstrates the shape without providing a usable key. Public keys, certificates, truncated fragments, indented or inline delimiters, and legacy Proc-Type / DEK-Info header blocks are outside this initial detector’s scope.

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Scan and redact

Node.js uses the same configuration with scan and scanAndTransform from @datafog/node. Browser applications import these functions and initialize @datafog/wasm first. Rust uses scan and scan_and_transform. See the SDK reference for each runtime’s return types.

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Finding and transformation boundaries

Each finding covers the entire block, including both delimiters and every original internal newline. It excludes the newline following the closing delimiter and any surrounding text. The finding has entity type PRIVATE_KEY, detector name datafog-core/private-key, the Core detector version, and no confidence score. Byte, Unicode code-point, and JavaScript UTF-16 offsets retain the standard finding contract. Structured scans inspect each string value independently; a header and footer in separate fields never form a key. Redaction replaces the whole block with [PRIVATE_KEY]; masking and removal also operate on its entire span. Existing entity selection, exact allowlists, and source-range validation apply. Pseudonymization and reversible tokenization use the existing providers in Rust, Python, and Node.js. Browser WASM rejects these provider-dependent strategies as documented in its SDK reference.