NAME

PKCS12_newpass — change the password of a PKCS#12 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 PKCS#12 structure.

p12 is a pointer to a PKCS#12 structure. oldpass is the existing password and newpass is the new password.

If the PKCS#12 structure does not have a password, use the empty string "" for oldpass. Passing NULL for oldpass results in a PKCS12_newpass() failure.

If the wrong password is used for oldpass, the function will fail with a MAC verification error. In rare cases, the PKCS#12 structure does not contain a MAC: in this case it will usually fail with a decryption padding error.

RETURN VALUES

Upon successful completion, 1 is returned; otherwise 0 is returned and an error code can be retrieved with ERR_get_error(3).

EXAMPLES

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;
}

SEE ALSO

PKCS12_create(3), PKCS12_new(3)

HISTORY

PKCS12_newpass() first appeared in OpenSSL 0.9.5 and has been available since OpenBSD 2.7.

BUGS

The password format is a NUL terminated ASCII string which is converted to Unicode form internally. As a result, some passwords cannot be supplied to this function.