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SSL_CTX_set_default_passwd_cb_userdata.3
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On invocation a pointer to \fBuserdata\fR is provided. The pem_passwd_cb must write the password into the provided buffer \&\fBbuf\fR which is of size \fBsize\fR. The actual length of the password must be returned to the calling function. \fBrwflag\fR indicates whether the callback is used for reading/decryption (rwflag=0) or writing/encryption (rwflag=1). .SH "NOTES" .IX Header "NOTES" When loading or storing private keys, a password might be supplied to protect the private key. The way this password can be supplied may depend on the application. If only one private key is handled, it can be practical to have \fIpem_passwd_cb()\fR handle the password dialog interactively. If several keys have to be handled, it can be practical to ask for the password once, then keep it in memory and use it several times. In the last case, the password could be stored into the \fBuserdata\fR storage and the \&\fIpem_passwd_cb()\fR only returns the password already stored. .PP When asking for the password interactively, \fIpem_passwd_cb()\fR can use \&\fBrwflag\fR to check, whether an item shall be encrypted (rwflag=1). In this case the password dialog may ask for the same password twice for comparison in order to catch typos, that would make decryption impossible. .PP Other items in \s-1PEM\s0 formatting (certificates) can also be encrypted, it is however not usual, as certificate information is considered public. .SH "RETURN VALUES" .IX Header "RETURN VALUES" \&\fISSL_CTX_set_default_passwd_cb()\fR and \fISSL_CTX_set_default_passwd_cb_userdata()\fR do not provide diagnostic information. .SH "EXAMPLES" .IX Header "EXAMPLES" The following example returns the password provided as \fBuserdata\fR to the calling function. The password is considered to be a '\e0' terminated string. If the password does not fit into the buffer, the password is truncated. .PP .Vb 6 \& int pem_passwd_cb(char *buf, int size, int rwflag, void *password) \& { \& strncpy(buf, (char *)(password), size); \& buf[size - 1] = '\e0'; \& return(strlen(buf)); \& } .Ve .SH "SEE ALSO" .IX Header "SEE ALSO" \&\fIssl\fR\|(3), \&\fISSL_CTX_use_certificate\fR\|(3)