CRYPT_GENSALT_IMPL(3C) Standard C Library Functions CRYPT_GENSALT_IMPL(3C)

NAME

crypt_gensalt_impl - generate salt for password encryption

SYNOPSIS

#include <crypt.h>

char *crypt_gensalt_impl(char *gsbuffer, size_t gsbufflen,
const char *oldsalt, const struct passwd *userinfo,
const char **params);

DESCRIPTION

The crypt_gensalt_impl() function is called by crypt_gensalt(3C) to
generate the salt for password encryption.


The gsbuffer argument is a pointer to an MT-safe buffer of size
gsbufflen.


The oldsalt and userinfo arguments are passed unchanged from
crypt_gensalt(3C).


The params argument is an argv-like null terminated vector of type char
*. The first element of params represents the mechanism token name from
crypt.conf(5). The remaining elements of params represent strings of the
form <parameter>[=<value>] to allow passing in additional information
from the crypt.conf entry, such as specifying rounds information
"rounds=4096".


The value returned by crypt_gensalt_impl() points to a thread-specific
buffer to be freed by the caller of crypt_gensalt(3C) after calling
crypt(3C).

RETURN VALUES

Upon successful completion, crypt_gensalt_impl() 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_impl() function will fail if:

EINVAL
The configuration file crypt.conf contains an invalid entry.


ELIBACC
The required crypt shared library was not found.


ENOMEM
There is insufficient memory to perform hashing.

ATTRIBUTES

See attributes(7) 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(3C),
getpassphrase(3C), crypt.conf(5), passwd(5), attributes(7)

June 10, 2002 CRYPT_GENSALT_IMPL(3C)