f4401cd869
alter des.h to be friendly with openssl/des.h (you can include both in the same file) make libkrb to depend on libdes. bump major. massage various portioin of heimdal to be friendly with openssl 0.9.7b.
218 lines
6.9 KiB
Groff
218 lines
6.9 KiB
Groff
.\" $NetBSD: SSL_CTX_set_default_passwd_cb.3,v 1.8 2003/07/24 14:16:44 itojun Exp $
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.\" ======================================================================
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.\"
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.IX Title "SSL_CTX_set_default_passwd_cb 3"
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.TH SSL_CTX_set_default_passwd_cb 3 "0.9.7b" "2001-07-12" "OpenSSL"
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.UC
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.SH "NAME"
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SSL_CTX_set_default_passwd_cb, SSL_CTX_set_default_passwd_cb_userdata \- set passwd callback for encrypted \s-1PEM\s0 file handling
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.SH "LIBRARY"
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libcrypto, -lcrypto
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.SH "SYNOPSIS"
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.IX Header "SYNOPSIS"
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.Vb 1
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\& #include <openssl/ssl.h>
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.Ve
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.Vb 2
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\& void SSL_CTX_set_default_passwd_cb(SSL_CTX *ctx, pem_password_cb *cb);
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\& void SSL_CTX_set_default_passwd_cb_userdata(SSL_CTX *ctx, void *u);
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.Ve
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.Vb 1
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\& int pem_passwd_cb(char *buf, int size, int rwflag, void *userdata);
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.Ve
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.SH "DESCRIPTION"
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.IX Header "DESCRIPTION"
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\&\fISSL_CTX_set_default_passwd_cb()\fR sets the default password callback called
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when loading/storing a \s-1PEM\s0 certificate with encryption.
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.PP
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\&\fISSL_CTX_set_default_passwd_cb_userdata()\fR sets a pointer to \fBuserdata\fR which
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will be provided to the password callback on invocation.
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.PP
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The \fIpem_passwd_cb()\fR, which must be provided by the application, hands back the
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password to be used during decryption. On invocation a pointer to \fBuserdata\fR
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is provided. The pem_passwd_cb must write the password into the provided buffer
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\&\fBbuf\fR which is of size \fBsize\fR. The actual length of the password must
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be returned to the calling function. \fBrwflag\fR indicates whether the
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callback is used for reading/decryption (rwflag=0) or writing/encryption
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(rwflag=1).
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.SH "NOTES"
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.IX Header "NOTES"
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When loading or storing private keys, a password might be supplied to
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protect the private key. The way this password can be supplied may depend
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on the application. If only one private key is handled, it can be practical
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to have \fIpem_passwd_cb()\fR handle the password dialog interactively. If several
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keys have to be handled, it can be practical to ask for the password once,
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then keep it in memory and use it several times. In the last case, the
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password could be stored into the \fBuserdata\fR storage and the
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\&\fIpem_passwd_cb()\fR only returns the password already stored.
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.PP
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When asking for the password interactively, \fIpem_passwd_cb()\fR can use
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\&\fBrwflag\fR to check, whether an item shall be encrypted (rwflag=1).
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In this case the password dialog may ask for the same password twice
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for comparison in order to catch typos, that would make decryption
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impossible.
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.PP
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Other items in \s-1PEM\s0 formatting (certificates) can also be encrypted, it is
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however not usual, as certificate information is considered public.
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.SH "RETURN VALUES"
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.IX Header "RETURN VALUES"
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\&\fISSL_CTX_set_default_passwd_cb()\fR and \fISSL_CTX_set_default_passwd_cb_userdata()\fR
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do not provide diagnostic information.
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.SH "EXAMPLES"
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.IX Header "EXAMPLES"
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The following example returns the password provided as \fBuserdata\fR to the
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calling function. The password is considered to be a '\e0' terminated
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string. If the password does not fit into the buffer, the password is
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truncated.
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.PP
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.Vb 6
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\& int pem_passwd_cb(char *buf, int size, int rwflag, void *password)
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\& {
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\& strncpy(buf, (char *)(password), size);
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\& buf[size - 1] = '\e0';
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\& return(strlen(buf));
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\& }
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.Ve
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.SH "SEE ALSO"
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.IX Header "SEE ALSO"
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ssl(3),
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SSL_CTX_use_certificate(3)
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