1PKCS12_NEWPASS(3) OpenSSL PKCS12_NEWPASS(3)
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6 PKCS12_newpass - change the password of a PKCS12 structure
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9 #include <openssl/pkcs12.h>
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11 int PKCS12_newpass(PKCS12 *p12, const char *oldpass, const char *newpass);
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14 PKCS12_newpass() changes the password of a PKCS12 structure.
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16 p12 is a pointer to a PKCS12 structure. oldpass is the existing
17 password and newpass is the new password.
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20 Each of oldpass and newpass is independently interpreted as a string in
21 the UTF-8 encoding. If it is not valid UTF-8, it is assumed to be
22 ISO8859-1 instead.
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24 In particular, this means that passwords in the locale character set
25 (or code page on Windows) must potentially be converted to UTF-8 before
26 use. This may include passwords from local text files, or input from
27 the terminal or command line. Refer to the documentation of
28 UI_OpenSSL(3), for example.
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31 PKCS12_newpass() returns 1 on success or 0 on failure. Applications can
32 retrieve the most recent error from PKCS12_newpass() with
33 ERR_get_error().
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36 This example loads a PKCS#12 file, changes its password and writes out
37 the result to a new file.
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39 #include <stdio.h>
40 #include <stdlib.h>
41 #include <openssl/pem.h>
42 #include <openssl/err.h>
43 #include <openssl/pkcs12.h>
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45 int main(int argc, char **argv)
46 {
47 FILE *fp;
48 PKCS12 *p12;
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50 if (argc != 5) {
51 fprintf(stderr, "Usage: pkread p12file password newpass opfile\n");
52 return 1;
53 }
54 if ((fp = fopen(argv[1], "rb")) == NULL) {
55 fprintf(stderr, "Error opening file %s\n", argv[1]);
56 return 1;
57 }
58 p12 = d2i_PKCS12_fp(fp, NULL);
59 fclose(fp);
60 if (p12 == NULL) {
61 fprintf(stderr, "Error reading PKCS#12 file\n");
62 ERR_print_errors_fp(stderr);
63 return 1;
64 }
65 if (PKCS12_newpass(p12, argv[2], argv[3]) == 0) {
66 fprintf(stderr, "Error changing password\n");
67 ERR_print_errors_fp(stderr);
68 PKCS12_free(p12);
69 return 1;
70 }
71 if ((fp = fopen(argv[4], "wb")) == NULL) {
72 fprintf(stderr, "Error opening file %s\n", argv[4]);
73 PKCS12_free(p12);
74 return 1;
75 }
76 i2d_PKCS12_fp(fp, p12);
77 PKCS12_free(p12);
78 fclose(fp);
79 return 0;
80 }
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83 If the PKCS#12 structure does not have a password, then you must use
84 the empty string "" for oldpass. Using NULL for oldpass will result in
85 a PKCS12_newpass() failure.
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87 If the wrong password is used for oldpass then the function will fail,
88 with a MAC verification error. In rare cases the PKCS12 structure does
89 not contain a MAC: in this case it will usually fail with a decryption
90 padding error.
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93 The password format is a NULL terminated ASCII string which is
94 converted to Unicode form internally. As a result some passwords cannot
95 be supplied to this function.
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98 PKCS12_create(3), ERR_get_error(3), passphrase-encoding(7)
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101 Copyright 2016-2019 The OpenSSL Project Authors. All Rights Reserved.
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103 Licensed under the OpenSSL license (the "License"). You may not use
104 this file except in compliance with the License. You can obtain a copy
105 in the file LICENSE in the source distribution or at
106 <https://www.openssl.org/source/license.html>.
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1101.1.1i 2021-07-22 PKCS12_NEWPASS(3)