PKCS12_newpass - change the password of a PKCS12 structure
#include <openssl/pkcs12.h>
int PKCS12_newpass(PKCS12 *p12, const char *oldpass, const char *newpass);PKCS12_newpass() changes the password of a PKCS12 structure.
p12 is a pointer to a PKCS12 structure. oldpass is the existing password and newpass is the new password.
Each of oldpass and newpass is independently interpreted as a string in the UTF-8 encoding. If it is not valid UTF-8, it is assumed to be ISO8859-1 instead.
In particular, this means that passwords in the locale character set (or code page on Windows) must potentially be converted to UTF-8 before use. This may include passwords from local text files, or input from the terminal or command line. Refer to the documentation of UI_OpenSSL(3), for example.
PKCS12_newpass() returns 1 on success or 0 on failure. Applications can retrieve the most recent error from PKCS12_newpass() with ERR_get_error().
This example loads a PKCS#12 file, changes its password and writes out the result to a new file.
#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\n");
return 1;
}
if ((fp = fopen(argv[1], "rb")) == NULL) {
fprintf(stderr, "Error opening file %s\n", argv[1]);
return 1;
}
p12 = d2i_PKCS12_fp(fp, NULL);
fclose(fp);
if (p12 == NULL) {
fprintf(stderr, "Error reading PKCS#12 file\n");
ERR_print_errors_fp(stderr);
return 1;
}
if (PKCS12_newpass(p12, argv[2], argv[3]) == 0) {
fprintf(stderr, "Error changing password\n");
ERR_print_errors_fp(stderr);
PKCS12_free(p12);
return 1;
}
if ((fp = fopen(argv[4], "wb")) == NULL) {
fprintf(stderr, "Error opening file %s\n", argv[4]);
PKCS12_free(p12);
return 1;
}
i2d_PKCS12_fp(fp, p12);
PKCS12_free(p12);
fclose(fp);
return 0;
}If the PKCS#12 structure does not have a password, then you must use the empty string "" for oldpass. Using NULL for oldpass will result in a PKCS12_newpass() failure.
If the wrong password is used for oldpass then the function will fail, with a MAC verification error. In rare cases the PKCS12 structure does not contain a MAC: in this case it will usually fail with a decryption padding error.
The password format is a NULL terminated ASCII string which is converted to Unicode form internally. As a result some passwords cannot be supplied to this function.
PKCS12_create(3), ERR_get_error(3), passphrase-encoding(7)
Copyright 2016-2019 The OpenSSL Project Authors. All Rights Reserved.
Licensed under the OpenSSL license (the "License"). You may not use this file except in compliance with the License. You can obtain a copy in the file LICENSE in the source distribution or at https://www.openssl.org/source/license.html.