Tool to decrypt/encrypt SHA-256. The SHA-256 hash is the US federal standard that matches an hexadecimal 64-character fingerprint to an original binary data.

SHA-256 - dCode

Tag(s) : Hashing Function, Modern Cryptography

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**SHA-256** is a hash standard (derived from SHA-2), a standard of the United States federal government which allows any binary data to correspond to a fingerprint of 64 hexadecimal characters which characterizes it in an almost unique way.

__Example:__ `dCode` has for hash `254cd63ece8595b5c503783d596803f1552e0733d02fe4080b217eadb17711dd`

**SHA-256** encryption is a hash, which means that it is one-way and can not be decrypted.

**SHA256** encryption computes a 256-bit or 32-byte digital fingerprint, whose hexadecimal writing consists of 64 characters. The algorithm uses non-linear functions such as:

$$ \operatorname{Ch}(E,F,G) = (E \wedge F) \oplus (\neg E \wedge G) $$

$$ \operatorname{Ma}(A,B,C) = (A \wedge B) \oplus (A \wedge C) \oplus (B \wedge C) $$

$$ \Sigma_0(A) = (A\!\ggg\!2) \oplus (A\!\ggg\!13) \oplus (A\!\ggg\!22) $$

$$ \Sigma_1(E) = (E\!\ggg\!6) \oplus (E\!\ggg\!11) \oplus (E\!\ggg\!25) $$

and also 64 constants: 0x428a2f98, 0x71374491, 0xb5c0fbcf, 0xe9b5dba5, 0x3956c25b, 0x59f111f1, 0x923f82a4, 0xab1c5ed5, 0xd807aa98, 0x12835b01, 0x243185be, 0x550c7dc3, 0x72be5d74, 0x80deb1fe, 0x9bdc06a7, 0xc19bf174, 0xe49b69c1, 0xefbe4786, 0x0fc19dc6, 0x240ca1cc, 0x2de92c6f, 0x4a7484aa, 0x5cb0a9dc, 0x76f988da, 0x983e5152, 0xa831c66d, 0xb00327c8, 0xbf597fc7, 0xc6e00bf3, 0xd5a79147, 0x06ca6351, 0x14292967, 0x27b70a85, 0x2e1b2138, 0x4d2c6dfc, 0x53380d13, 0x650a7354, 0x766a0abb, 0x81c2c92e, 0x92722c85, 0xa2bfe8a1, 0xa81a664b, 0xc24b8b70, 0xc76c51a3, 0xd192e819, 0xd6990624, 0xf40e3585, 0x106aa070, 0x19a4c116, 0x1e376c08, 0x2748774c, 0x34b0bcb5, 0x391c0cb3, 0x4ed8aa4a, 0x5b9cca4f, 0x682e6ff3, 0x748f82ee, 0x78a5636f, 0x84c87814, 0x8cc70208, 0x90befffa, 0xa4506ceb, 0xbef9a3f7, 0xc67178f2

The purpose of these functions is to maximize the footprint differences, even for small input string differences.

__Example:__ ` SHA-256` is coded as' bbd07c4fc02c99b97124febf42c7b63b5011c0df28d409fbb486b5a9d2e615ea

The hash is composed of 64 hexadecimal characters `0123456789abcdef` (ie 256 bits)

The **SHA256** algorithm is used by blockchain and validation of Bitcoin transactions, any reference is a clue.

dCode retains ownership of the online "SHA-256" source code. Except explicit open source licence (indicated CC / Creative Commons / free), the "SHA-256" algorithm, the applet or snippet (converter, solver, encryption / decryption, encoding / decoding, ciphering / deciphering, translator), or the "SHA-256" functions (calculate, convert, solve, decrypt / encrypt, decipher / cipher, decode / encode, translate) written in any informatic language (Python, Java, PHP, C#, Javascript, Matlab, etc.) and all data download, script, copy-paste, or API access for "SHA-256" are not public, same for offline use on PC, tablet, iPhone or Android ! Remainder : dCode is free to use.

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NB: for encrypted messages, test our automatic cipher identifier!

sha256,sha,256,hash,secure,algorithm,password,salt,salting,bitcoin

Source : https://www.dcode.fr/sha256-hash

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