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.\" ========================================================================
.\"
.IX Title "PKCS12_NEWPASS 3"
.TH PKCS12_NEWPASS 3 "2023-09-11" "1.1.1w" "OpenSSL"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
.\" way too many mistakes in technical documents.
.if n .ad l
.nh
.SH "NAME"
PKCS12_newpass \- change the password of a PKCS12 structure
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 1
\& #include <openssl/pkcs12.h>
\&
\& int PKCS12_newpass(PKCS12 *p12, const char *oldpass, const char *newpass);
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
\&\fIPKCS12_newpass()\fR changes the password of a \s-1PKCS12\s0 structure.
.PP
\&\fBp12\fR is a pointer to a \s-1PKCS12\s0 structure. \fBoldpass\fR is the existing password
and \fBnewpass\fR is the new password.
.SH "NOTES"
.IX Header "NOTES"
Each of \fBoldpass\fR and \fBnewpass\fR is independently interpreted as a string in
the \s-1UTF\-8\s0 encoding. If it is not valid \s-1UTF\-8,\s0 it is assumed to be \s-1ISO8859\-1\s0
instead.
.PP
In particular, this means that passwords in the locale character set
(or code page on Windows) must potentially be converted to \s-1UTF\-8\s0 before
use. This may include passwords from local text files, or input from
the terminal or command line. Refer to the documentation of
\&\fIUI_OpenSSL\fR\|(3), for example.
.SH "RETURN VALUES"
.IX Header "RETURN VALUES"
\&\fIPKCS12_newpass()\fR returns 1 on success or 0 on failure. Applications can
retrieve the most recent error from \fIPKCS12_newpass()\fR with \fIERR_get_error()\fR.
.SH "EXAMPLES"
.IX Header "EXAMPLES"
This example loads a PKCS#12 file, changes its password and writes out
the result to a new file.
.PP
.Vb 5
\& #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;
\& }
.Ve
.SH "NOTES"
.IX Header "NOTES"
If the PKCS#12 structure does not have a password, then you must use the empty
string "" for \fBoldpass\fR. Using \s-1NULL\s0 for \fBoldpass\fR will result in a
\&\fIPKCS12_newpass()\fR failure.
.PP
If the wrong password is used for \fBoldpass\fR then the function will fail,
with a \s-1MAC\s0 verification error. In rare cases the \s-1PKCS12\s0 structure does not
contain a \s-1MAC:\s0 in this case it will usually fail with a decryption padding
error.
.SH "BUGS"
.IX Header "BUGS"
The password format is a \s-1NULL\s0 terminated \s-1ASCII\s0 string which is converted to
Unicode form internally. As a result some passwords cannot be supplied to
this function.
.SH "SEE ALSO"
.IX Header "SEE ALSO"
\&\fIPKCS12_create\fR\|(3), \fIERR_get_error\fR\|(3),
\&\fIpassphrase\-encoding\fR\|(7)
.SH "COPYRIGHT"
.IX Header "COPYRIGHT"
Copyright 2016\-2019 The OpenSSL Project Authors. All Rights Reserved.
.PP
Licensed under the OpenSSL license (the \*(L"License\*(R").  You may not use
this file except in compliance with the License.  You can obtain a copy
in the file \s-1LICENSE\s0 in the source distribution or at
<https://www.openssl.org/source/license.html>.