PKCS12_newpass.3
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Always turn off hyphenation; it makes .\" way too many mistakes in technical documents. .if n .ad l .nh .SH "NAME" PKCS12_newpass \- change the password of a PKCS12 structure .SH "SYNOPSIS" .IX Header "SYNOPSIS" .Vb 1 \& #include <openssl/pkcs12.h> \& \& int PKCS12_newpass(PKCS12 *p12, const char *oldpass, const char *newpass); .Ve .SH "DESCRIPTION" .IX Header "DESCRIPTION" \&\fBPKCS12_newpass()\fR changes the password of a \s-1PKCS12\s0 structure. .PP \&\fBp12\fR is a pointer to a \s-1PKCS12\s0 structure. \fBoldpass\fR is the existing password and \fBnewpass\fR is the new password. .SH "NOTES" .IX Header "NOTES" Each of \fBoldpass\fR and \fBnewpass\fR is independently interpreted as a string in the \s-1UTF\-8\s0 encoding. If it is not valid \s-1UTF\-8,\s0 it is assumed to be \s-1ISO8859\-1\s0 instead. .PP In particular, this means that passwords in the locale character set (or code page on Windows) must potentially be converted to \s-1UTF\-8\s0 before use. This may include passwords from local text files, or input from the terminal or command line. Refer to the documentation of \&\fBUI_OpenSSL\fR\|(3), for example. .SH "RETURN VALUES" .IX Header "RETURN VALUES" \&\fBPKCS12_newpass()\fR returns 1 on success or 0 on failure. Applications can retrieve the most recent error from \fBPKCS12_newpass()\fR with \fBERR_get_error()\fR. .SH "EXAMPLES" .IX Header "EXAMPLES" This example loads a PKCS#12 file, changes its password and writes out the result to a new file. .PP .Vb 5 \& #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\en"); \& return 1; \& } \& if ((fp = fopen(argv[1], "rb")) == NULL) { \& fprintf(stderr, "Error opening file %s\en", argv[1]); \& return 1; \& } \& p12 = d2i_PKCS12_fp(fp, NULL); \& fclose(fp); \& if (p12 == NULL) { \& fprintf(stderr, "Error reading PKCS#12 file\en"); \& ERR_print_errors_fp(stderr); \& return 1; \& } \& if (PKCS12_newpass(p12, argv[2], argv[3]) == 0) { \& fprintf(stderr, "Error changing password\en"); \& ERR_print_errors_fp(stderr); \& PKCS12_free(p12); \& return 1; \& } \& if ((fp = fopen(argv[4], "wb")) == NULL) { \& fprintf(stderr, "Error opening file %s\en", argv[4]); \& PKCS12_free(p12); \& return 1; \& } \& i2d_PKCS12_fp(fp, p12); \& PKCS12_free(p12); \& fclose(fp); \& return 0; \& } .Ve .SH "NOTES" .IX Header "NOTES" If the PKCS#12 structure does not have a password, then you must use the empty string "" for \fBoldpass\fR. Using \s-1NULL\s0 for \fBoldpass\fR will result in a \&\fBPKCS12_newpass()\fR failure. .PP If the wrong password is used for \fBoldpass\fR then the function will fail, with a \s-1MAC\s0 verification error. In rare cases the \s-1PKCS12\s0 structure does not contain a \s-1MAC:\s0 in this case it will usually fail with a decryption padding error. .SH "BUGS" .IX Header "BUGS" The password format is a \s-1NULL\s0 terminated \s-1ASCII\s0 string which is converted to Unicode form internally. As a result some passwords cannot be supplied to this function. .SH "SEE ALSO" .IX Header "SEE ALSO" \&\fBPKCS12_create\fR\|(3), \fBERR_get_error\fR\|(3), \&\fBpassphrase\-encoding\fR\|(7) .SH "COPYRIGHT" .IX Header "COPYRIGHT" Copyright 2016\-2019 The OpenSSL Project Authors. All Rights Reserved. .PP Licensed under the OpenSSL license (the \*(L"License\*(R"). You may not use this file except in compliance with the License. You can obtain a copy in the file \s-1LICENSE\s0 in the source distribution or at <https://www.openssl.org/source/license.html>.
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