NAME

       PKCS12_newpass - change the password of a PKCS12 structure

SYNOPSIS

        #include <openssl/pkcs12.h>

        int PKCS12_newpass(PKCS12 *p12, const char *oldpass, const char *newpass);

DESCRIPTION

       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.

NOTES

       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.

RETURN VALUES

       PKCS12_newpass() returns 1 on success or 0 on failure. Applications can retrieve the most
       recent error from PKCS12_newpass() with ERR_get_error().

EXAMPLE

       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;
        }

NOTES

       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.

BUGS

       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.

SEE ALSO

       PKCS12_create(3), ERR_get_error(3), passphrase-encoding(7)

COPYRIGHT

       Copyright 2016-2018 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>.