.\"	$OpenBSD: PKCS12_newpass.3,v 1.1 2016/11/28 23:02:16 schwarze Exp $
.\"	OpenSSL c95a8b4e May 5 14:26:26 2016 +0100
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.\" This file was written by Jeffrey Walton <noloader@gmail.com>.
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.Dd $Mdocdate: November 28 2016 $
.Dt PKCS12_NEWPASS 3
.Os
.Sh NAME
.Nm PKCS12_newpass
.Nd change the password of a PKCS#12 structure
.Sh SYNOPSIS
.In openssl/pkcs12.h
.Ft int
.Fo PKCS12_newpass
.Fa "PKCS12 *p12"
.Fa "const char *oldpass"
.Fa "const char *newpass"
.Fc
.Sh DESCRIPTION
.Fn PKCS12_newpass
changes the password of a PKCS#12 structure.
.Pp
.Fa p12
is a pointer to a PKCS#12 structure.
.Fa oldpass
is the existing password and
.Fa newpass
is the new password.
.Pp
If the PKCS#12 structure does not have a password, use the empty
string
.Qq \&
for
.Fa oldpass .
Passing
.Dv NULL
for
.Fa oldpass
results in a
.Fn PKCS12_newpass
failure.
.Pp
If the wrong password is used for
.Fa oldpass ,
the function will fail with a MAC verification error.
In rare cases, the PKCS#12 structure does not contain a MAC:
in this case it will usually fail with a decryption padding error.
.Sh RETURN VALUES
.Fn PKCS12_newpass
returns 1 on success or 0 on failure.
.Pp
Applications can retrieve the most recent error from
.Fn PKCS12_newpass
with
.Xr ERR_get_error 3 .
.Sh EXAMPLES
This example loads a PKCS#12 file, changes its password,
and writes out the result to a new file.
.Bd -literal
#include <stdio.h>
#include <stdlib.h>
#include <openssl/pem.h>
#include <openssl/err.h>
#include <openssl/pkcs12.h>

int main(int argc, char **argv)
{
	FILE *fp;
	PKCS12 *p12;
	if (argc != 5) {
		fprintf(stderr,
		    "Usage: pkread p12file password newpass opfile\en");
		return 1;
	}
	if ((fp = fopen(argv[1], "rb")) == NULL) {
		fprintf(stderr, "Error opening file %s\en", argv[1]);
		return 1;
	}
	p12 = d2i_PKCS12_fp(fp, NULL);
	fclose(fp);
	if (p12 == NULL) {
		fprintf(stderr, "Error reading PKCS#12 file\en");
		ERR_print_errors_fp(stderr);
		return 1;
	}
	if (PKCS12_newpass(p12, argv[2], argv[3]) == 0) {
		fprintf(stderr, "Error changing password\en");
		ERR_print_errors_fp(stderr);
		PKCS12_free(p12);
		return 1;
	}
	if ((fp = fopen(argv[4], "wb")) == NULL) {
		fprintf(stderr, "Error opening file %s\en", argv[4]);
		PKCS12_free(p12);
		return 1;
	}
	i2d_PKCS12_fp(fp, p12);
	PKCS12_free(p12);
	fclose(fp);
	return 0;
}
.Ed
.Sh SEE ALSO
.Xr ERR_get_error 3 ,
.Xr PKCS12_create 3
.Sh BUGS
The password format is a NUL terminated ASCII string which is
converted to Unicode form internally.
As a result, some passwords cannot be supplied to this function.