212 lines
6.6 KiB
Groff
212 lines
6.6 KiB
Groff
.\" $NetBSD: SSL_CTX_set_default_passwd_cb.3,v 1.1 2001/04/12 10:45:40 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 "0.9.6a" "2001-04-12" "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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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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