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10 .TH CRYPT 3C "Sep 28, 2004"
12 crypt \- string encoding function
18 \fBchar *\fR\fBcrypt\fR(\fBconst char *\fR\fIkey\fR, \fBconst char *\fR\fIsalt\fR);
21 .SS "Standard conforming"
26 \fBchar *\fR\fBcrypt\fR(\fBconst char *\fR\fIkey\fR, \fBconst char *\fR\fIsalt\fR);
32 The \fBcrypt()\fR function encodes strings suitable for secure storage as
33 passwords. It generates the password hash given the \fIkey\fR and \fIsalt\fR.
36 The \fIkey\fR argument is the plain text password to be encrypted.
39 If the first character of \fIsalt\fR is "$", \fBcrypt()\fR uses
40 \fBcrypt.conf\fR(4) to determine which shared module to load for the encryption
41 algorithm. The algorithm name \fBcrypt()\fR uses to search in \fBcrypt.conf\fR
42 is the string between the first and second "$", or between the first "$" and
43 first "," if a "," comes before the second "$".
46 If the first character of \fIsalt\fR is not "$", the algorithm described on
47 \fBcrypt_unix\fR(5) is used.
51 Upon successful completion, \fBcrypt()\fR returns a pointer to the encoded
52 string. Otherwise it returns a null pointer and sets \fBerrno\fR to indicate
56 The return value points to static data that is overwritten by each call.
60 The \fBcrypt()\fR function will fail if:
67 An entry in \fBcrypt.conf\fR is invalid.
76 The required shared library was not found.
85 There is insufficient memory to generate the hash.
94 The functionality is not supported on this system.
100 The values returned by this function might not be portable among
101 standard-conforming systems. See \fBstandards\fR(5).
104 Applications should not use \fBcrypt()\fR to store or verify user passwords but
105 should use the functions described on \fBpam\fR(3PAM) instead.
109 See \fBattributes\fR(5) for descriptions of the following attributes:
117 ATTRIBUTE TYPE ATTRIBUTE VALUE
119 Interface Stability Standard
127 \fBpasswd\fR(1), \fBcrypt_genhash_impl\fR(3C), \fBcrypt_gensalt\fR(3C),
128 \fBcrypt_gensalt_impl\fR(3C), \fBgetpassphrase\fR(3C), \fBpam\fR(3PAM),
129 \fBpasswd\fR(4), \fBpolicy.conf\fR(4), \fBattributes\fR(5),
130 \fBcrypt_unix\fR(5), \fBstandards\fR(5)