Hash Files

Computes cryptographic hashes for local files listed in the input table.
Simply speaking, it generates unique fingerprints for file contents.
It is practically impossible to find 2 different files sharing the same hash value (collision resistence). Besides brute force attempts of trying many inputs, it is also practically impossible to restore the original file content from the fingerprint (oneway function).

Options

File path column

String column holding the local pathes of the files to be hashed.

Hash Function

The cryptographic hash function to use.

Output Format

The choice of output format. For example, a 3 byte ASCII file with content "abc", will SHA-256 hash to:%%00010* hex (upper case): BA7816BF8F01CFEA414140DE5DAE2223B00361A396177A9CB410FF61F20015AD%%00010%%00010* hex (lower case): ba7816bf8f01cfea414140de5dae2223b00361a396177a9cb410ff61f20015ad%%00010%%00010* base64 (with padding): ungWv48Bz+pBQUDeXa4iI7ADYaOWF3qctBD/YfIAFa0=%%00010%%00010*base64 (without padding): ungWv48Bz+pBQUDeXa4iI7ADYaOWF3qctBD/YfIAFa0

How to handle failed file access?

Determines how this component behaves in case one or more files cannot be read, e.g. missing files or lacking access rights.%%00010Note that currently KNIME does not allow components to show customer warnings, so in case of option 'output missing values as hash for failed files' the node will always execute with green traffic light and without warning, even if not a single hash could be calculated.

Output column name

The name of the output column that will hold the hashed values. No check is performed whether this column already exists, it would simply be overwritten in this case.

Nodes

• Single Selection Configuration3 ×
• Column Rename2 ×
• Column Filter1 ×
• Column Selection Configuration1 ×
• Component Input1 ×
• Show all 8 nodes

Extensions

• FeatureKNIME Base nodes
• FeatureKNIME Javasnippet
• FeatureKNIME Quick Forms

Links

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