crypt_gensalt(3c) [debian man page]
crypt_gensalt(3C) Standard C Library Functions crypt_gensalt(3C) NAME
crypt_gensalt - generate salt string for string encoding SYNOPSIS
#include <crypt.h> char *crypt_gensalt(const char *oldsalt, const struct passwd *userinfo); DESCRIPTION
The crypt_gensalt() function generates the salt string required by crypt(3C). If oldsalt is NULL, crypt_gensalt() uses the algorithm defined by CRYPT_DEFAULT in /etc/security/policy.conf. See policy.conf(4). If oldsalt is non-null, crypt_gensalt() determines if the algorithm specified by oldsalt is allowable by checking the CRYPT_ALGO- RITHMS_ALLOW and CRYPT_ALGORITHMS_DEPRECATE variables in /etc/security/policy.conf. If the algorithm is allowed, crypt_gensalt() loads the appropriate shared library and calls crypt_gensalt_impl(3C). If the algorithm is not allowed or there is no entry for it in crypt.conf, crypt_gensalt() uses the default algorithm. The mechanism just described provides a means to migrate users to new password hashing algorithms when the password is changed. RETURN VALUES
Upon successful completion, crypt_gensalt() returns a pointer to the new salt. Otherwise a null pointer is returned and errno is set to indicate the error. ERRORS
The crypt_gensalt() function will fail if: EINVAL The configuration file crypt.conf contains an invalid entry. ELIBACC The required shared library was not found. ENOMEM There is insufficient memory to perform hashing. USAGE
The value returned by crypt_gensalt() points to a null-terminated string. The caller of crypt_gensalt() is responsible for calling free(3C). Applications dealing with user authentication and password changing should not call crypt_gensalt() directly but should instead call the appropriate pam(3PAM) functions. ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Interface Stability |Evolving | +-----------------------------+-----------------------------+ |MT-Level |MT-Safe | +-----------------------------+-----------------------------+ SEE ALSO
passwd(1), crypt(3C), crypt_genhash_impl(3C), crypt_gensalt_impl(3C), getpassphrase(3C), malloc(3C), pam(3PAM), crypt.conf(4), passwd(4), policy.conf(4), attributes(5) SunOS 5.10 10 Jun 2002 crypt_gensalt(3C)
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crypt_gensalt(3C) Standard C Library Functions crypt_gensalt(3C) NAME
crypt_gensalt - generate salt string for string encoding SYNOPSIS
#include <crypt.h> char *crypt_gensalt(const char *oldsalt, const struct passwd *userinfo); DESCRIPTION
The crypt_gensalt() function generates the salt string required by crypt(3C). If oldsalt is NULL, crypt_gensalt() uses the algorithm defined by CRYPT_DEFAULT in /etc/security/policy.conf. See policy.conf(4). If oldsalt is non-null, crypt_gensalt() determines if the algorithm specified by oldsalt is allowable by checking the CRYPT_ALGO- RITHMS_ALLOW and CRYPT_ALGORITHMS_DEPRECATE variables in /etc/security/policy.conf. If the algorithm is allowed, crypt_gensalt() loads the appropriate shared library and calls crypt_gensalt_impl(3C). If the algorithm is not allowed or there is no entry for it in crypt.conf, crypt_gensalt() uses the default algorithm. The mechanism just described provides a means to migrate users to new password hashing algorithms when the password is changed. RETURN VALUES
Upon successful completion, crypt_gensalt() returns a pointer to the new salt. Otherwise a null pointer is returned and errno is set to indicate the error. ERRORS
The crypt_gensalt() function will fail if: EINVAL The configuration file crypt.conf contains an invalid entry. ELIBACC The required shared library was not found. ENOMEM There is insufficient memory to perform hashing. USAGE
The value returned by crypt_gensalt() points to a null-terminated string. The caller of crypt_gensalt() is responsible for calling free(3C). Applications dealing with user authentication and password changing should not call crypt_gensalt() directly but should instead call the appropriate pam(3PAM) functions. ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Interface Stability |Evolving | +-----------------------------+-----------------------------+ |MT-Level |MT-Safe | +-----------------------------+-----------------------------+ SEE ALSO
passwd(1), crypt(3C), crypt_genhash_impl(3C), crypt_gensalt_impl(3C), getpassphrase(3C), malloc(3C), pam(3PAM), crypt.conf(4), passwd(4), policy.conf(4), attributes(5) SunOS 5.10 10 Jun 2002 crypt_gensalt(3C)