Home - News ( United States | United Kingdom | Italy | Germany ) - Football scores

Showing content from http://reference.wolfram.com/language/ref/FileHash.html below:

FileHash—Wolfram Language Documentation

We deliver solutions for the AI era—combining symbolic computation, data-driven insights and deep technology expertise.

• Data & Computational Intelligence
• Model-Based Design
• Algorithm Development
• Wolfram|Alpha for Business
• Blockchain Technology
• Education Technology
• Quantum Computation

WolframConsulting.com

• See Also
  • FileSize
  • FileByteCount
  • FileDate
  • Hash
  • BinaryReadList
  • FileFormat
• Related Guides
  • Cryptographic Number Theory
  • Compression and Archive Formats
  • File Operations
  • Files
  • External Operations
  • Cryptography

FileHash[file]

gives an integer hash code for the contents of the specified file.

FileHash[file,"type"]

gives an integer hash of the specified type.

FileHash[file,"type","format"]

gives a hash code in the specified format.

FileHash[{file,range},…]

gives the hash code for the specified range of bytes.

FileHash[{filespec₁,filespec₂,…},…]

gives the hash codes for a list of files.

• Values generated by FileHash are based on the raw bytes in a file.
• Files may be specified as "file", File["file"], CloudObject["url"] or InputStream[…]. Input streams must have been opened with BinaryFormatTrue.
• FileHash supports the following range specifications:
• n first n bytes -n last n bytes {n} byte n only {m,n} bytes m through n 0 no bytes All all bytes
• FileHash[{stream,range},…] effectively extracts data at the specified range of byte positions in an input stream, ignoring any previous stream position.
• Each filespec can be either file or {file,range}.
• Possible hash code types include:
• "Adler32" Adler 32-bit cyclic redundancy check "CRC32" 32-bit cyclic redundancy check "MD2" 128-bit MD2 code "MD4" 128-bit MD4 code "MD5" 128-bit MD5 code (default) "RIPEMD160" 160-bit RIPEMD code "RIPEMD160SHA256" RIPEMD-160 following SHA-256 (as used in Bitcoin) "SHA" 160-bit SHA-1 code "SHA256" 256-bit SHA code "SHA256SHA256" double SHA-256 code (as used in Bitcoin) "SHA384" 384-bit SHA code "SHA512" 512-bit SHA code "SHA3-224" 224-bit SHA3 code "SHA3-256" 256-bit SHA3 code "SHA3-384" 384-bit SHA3 code "SHA3-512" 512-bit SHA3 code "Keccak224" 224-bit Keccak code "Keccak256" 256-bit Keccak code "Keccak384" 384-bit Keccak code "Keccak512" 512-bit Keccak code
• FileHash by default uses 128-bit MD5 code.
• Possible formats include:
• "Integer" integer (default) "DecimalString" decimal string "HexString" hexadecimal string "Base36String" base-36 alphanumeric string "Base64Encoding" Base64 encoding "ByteArray" hash code as an explicit byte array
• For compatibility with earlier versions of the Wolfram Language, the syntaxes FileHash[file,"type",range] and FileHash[file,"type",range,"format"] are also supported.

The fingerprint of a file:

The "SHA512" hash code of a file:

The "SHA512" hash code of the first 100 bytes of a file:

The "MD5" hash code in hexadecimal form:

Hash of a CloudObject:

Compute a hash for the first 100 bytes of a file:

Equivalently:

Compute a hash for the last 100 bytes:

Equivalently:

Compute a hash for bytes 100 through 200:

Compute a hash for all bytes except the first 100 or the last 100:

Compute the hash for byte 100 only:

Compute a hash for no bytes:

Compute the hashes of several files:

Find the hash for a complete file as well as several subsets of it:

Create a CloudObject:

Find the hash of the data contained in the CloudObject:

By default, MD5 hash of the full range is calculated:

For hashing, the data from the CloudObject is represented as a string including the newline:

The same hash using the sequence of bytes:

Open a binary stream:

Compute its hash:

The same result is given independently of the current stream position:

Close the stream:

Create an empty file and cloud object:

Put the same content in the file and cloud object:

Also open a stream pointing at the file:

The hashes of all three objects are the same:

Close the stream:

Compare different hash codes:

512-bit SHA code given as an integer:

512-bit SHA code given as a decimal string, including leading zeros:

Compare the different string representations of a hash:

The double SHA code of the first 50 bytes of a file, given as a ByteArray:

The byte array contains the 256 bits of the result:

View the individual bytes in the array:

The default format is "MD5":

The default range specification is All:

This is equivalent to {-1,1}:

Hashing zero bytes is equivalent to finding the hash of an empty file:

"Integer" is the default format:

"DecimalString" is the string version of "Integer", padded with zeros if necessary:

"HexString" is a base-16 representation, padded with zeros if necessary:

"Base36String" is a base-36 representation, padded with zeros if necessary:

"Base64Encoding" encodes bytes of the result using Base64 encoding:

FileHash[file,code] is effectively equivalent to Hash[ReadByteArray[file],code]:

FileHash[file,code] is effectively equivalent to Hash[ByteArray@Import[file,"Byte"]]:

RetroSearch is an open source project built by @garambo | Open a GitHub Issue

Search and Browse the WWW like it's 1997 | Search results from DuckDuckGo

HTML: 3.2 | Encoding: UTF-8 | Version: 0.7.4