Here is a function provided to encrypt a given key with a provided salt. The signature of the function is as follows:
char *crypt(const char *key, const char *salt);
If a salt given has a format of "$.$...$..." i.e. normally of the hashed password stored in shadow file (look for my previous blogs on shadow file), then the function will interpret the salt and get the type of hash to be used. A hash type could be of MD5 ($1$), SHA256 ($5$), etc. This way one can hash a password provided by a user (the argument 'key') and match/authenticate with the one stored in the shadow file. This function is highly recommended not to be used for any other purpose except authentication. Readers are recommended to go through its manual page and understand its usage.
Here are some references:
man 3 crypt
gnu_libc_crypt
man7_crypt
char *crypt(const char *key, const char *salt);
If a salt given has a format of "$.$...$..." i.e. normally of the hashed password stored in shadow file (look for my previous blogs on shadow file), then the function will interpret the salt and get the type of hash to be used. A hash type could be of MD5 ($1$), SHA256 ($5$), etc. This way one can hash a password provided by a user (the argument 'key') and match/authenticate with the one stored in the shadow file. This function is highly recommended not to be used for any other purpose except authentication. Readers are recommended to go through its manual page and understand its usage.
Here are some references:
man 3 crypt
gnu_libc_crypt
man7_crypt
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