5 SSL_CTX_set_default_passwd_cb, SSL_CTX_set_default_passwd_cb_userdata,
6 SSL_CTX_get_default_passwd_cb, SSL_CTX_get_default_passwd_cb_userdata,
7 SSL_set_default_passwd_cb, SSL_set_default_passwd_cb_userdata,
8 SSL_get_default_passwd_cb, SSL_get_default_passwd_cb_userdata - set or
9 get passwd callback for encrypted PEM file handling
13 #include <openssl/ssl.h>
15 void SSL_CTX_set_default_passwd_cb(SSL_CTX *ctx, pem_password_cb *cb);
16 void SSL_CTX_set_default_passwd_cb_userdata(SSL_CTX *ctx, void *u);
17 pem_password_cb *SSL_CTX_get_default_passwd_cb(SSL_CTX *ctx);
18 void *SSL_CTX_get_default_passwd_cb_userdata(SSL_CTX *ctx);
20 void SSL_set_default_passwd_cb(SSL *s, pem_password_cb *cb);
21 void SSL_set_default_passwd_cb_userdata(SSL *s, void *u);
22 pem_password_cb *SSL_get_default_passwd_cb(SSL *s);
23 void *SSL_get_default_passwd_cb_userdata(SSL *s);
27 SSL_CTX_set_default_passwd_cb() sets the default password callback called
28 when loading/storing a PEM certificate with encryption.
30 SSL_CTX_set_default_passwd_cb_userdata() sets a pointer to userdata, B<u>,
31 which will be provided to the password callback on invocation.
33 SSL_CTX_get_default_passwd_cb() returns a function pointer to the password
34 callback currently set in B<ctx>. If no callback was explicitly set, the
35 NULL pointer is returned.
37 SSL_CTX_get_default_passwd_cb_userdata() returns a pointer to the userdata
38 currently set in B<ctx>. If no userdata was explicitly set, the NULL pointer
41 SSL_set_default_passwd_cb(), SSL_set_default_passwd_cb_userdata(),
42 SSL_get_default_passwd_cb() and SSL_get_default_passwd_cb_userdata() perform
43 the same function as their SSL_CTX counterparts, but using an SSL object.
45 The password callback, which must be provided by the application, hands back the
46 password to be used during decryption.
47 On invocation a pointer to userdata
48 is provided. The function must store the password into the provided buffer
49 B<buf> which is of size B<size>. The actual length of the password must
50 be returned to the calling function. B<rwflag> indicates whether the
51 callback is used for reading/decryption (rwflag=0) or writing/encryption
53 For more details, see L<pem_password_cb(3)>.
57 When loading or storing private keys, a password might be supplied to
58 protect the private key. The way this password can be supplied may depend
59 on the application. If only one private key is handled, it can be practical
60 to have the callback handle the password dialog interactively. If several
61 keys have to be handled, it can be practical to ask for the password once,
62 then keep it in memory and use it several times. In the last case, the
63 password could be stored into the userdata storage and the
64 callback only returns the password already stored.
66 When asking for the password interactively, the callback can use
67 B<rwflag> to check, whether an item shall be encrypted (rwflag=1).
68 In this case the password dialog may ask for the same password twice
69 for comparison in order to catch typos, that would make decryption
72 Other items in PEM formatting (certificates) can also be encrypted, it is
73 however not usual, as certificate information is considered public.
77 These functions do not provide diagnostic information.
81 The following example returns the password provided as userdata to the
82 calling function. The password is considered to be a '\0' terminated
83 string. If the password does not fit into the buffer, the password is
86 int my_cb(char *buf, int size, int rwflag, void *u)
88 strncpy(buf, (char *)u, size);
95 SSL_CTX_get_default_passwd_cb(), SSL_CTX_get_default_passwd_cb_userdata(),
96 SSL_set_default_passwd_cb() and SSL_set_default_passwd_cb_userdata() were
97 first added to OpenSSL 1.1.0
102 L<SSL_CTX_use_certificate(3)>
106 Copyright 2000-2016 The OpenSSL Project Authors. All Rights Reserved.
108 Licensed under the OpenSSL license (the "License"). You may not use
109 this file except in compliance with the License. You can obtain a copy
110 in the file LICENSE in the source distribution or at
111 L<https://www.openssl.org/source/license.html>.