PKCS12_newpass (3)

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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 structure.

p12 is a pointer to a

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 encoding. If it is not valid it is assumed to be instead.

In particular, this means that passwords in the locale character set (or code page on Windows) must potentially be converted to

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 for oldpass will result in a PKCS12_newpass() failure.

If the wrong password is used for oldpass then the function will fail, with a

verification error. In rare cases the structure does not contain a in this case it will usually fail with a decryption padding error.

BUGS

The password format is a terminated 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)

COPYRIGHT

Copyright 2016 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

in the source distribution or at <www.openssl.org/source/license.html>.