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=pod
=head1 NAME
PKCS12_newpass - change the password of a PKCS12 structure
=head1 SYNOPSIS
#include <openssl/pkcs12.h>
int PKCS12_newpass(PKCS12 *p12, char *oldpass, char *newpass);
=head1 DESCRIPTION
PKCS12_newpass() changes the password of a PKCS12 structure.
B<p12> is a pointer to a PKCS12 structure. B<oldpass> is the existing password
and B<newpass> is the new password.
=head1 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().
=head1 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;
}
=head1 NOTES
If the PKCS#12 structure does not have a password, then you must use the empty
string "" for B<oldpass>. Using NULL for B<oldpass> will result in a
PKCS12_newpass() failure.
If the wrong password is used for B<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.
=head1 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.
=head1 SEE ALSO
L<PKCS12_create(3)>, L<ERR_get_error(3)>
=cut
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