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crypt (C)
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<p>crypt is a <a href="/facts/C_POSIX_library/bJToR2CY">POSIX C library</a> function. It is typically used to compute the <a href="/facts/Cryptographic_hash_function/cuxkgbST">hash</a> of user account passwords. The function outputs a text string which also <a href="/facts/Code/CSntvnEo">encodes</a> the <a href="/facts/Salt_(cryptography)/9g6l177I">salt</a> (usually the first two characters are the salt itself and the rest is the hashed result), and identifies the hash algorithm used (defaulting to the "traditional" one explained below). This output string forms a password record, which is usually stored in a text file. </p><p>More formally, crypt provides cryptographic key derivation functions for password validation and storage on Unix systems. </p>