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Diffstat (limited to 'secure/lib/libcrypto/man/EVP_SealInit.3')
| -rw-r--r-- | secure/lib/libcrypto/man/EVP_SealInit.3 | 211 |
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diff --git a/secure/lib/libcrypto/man/EVP_SealInit.3 b/secure/lib/libcrypto/man/EVP_SealInit.3 new file mode 100644 index 0000000..36fe4f1 --- /dev/null +++ b/secure/lib/libcrypto/man/EVP_SealInit.3 @@ -0,0 +1,211 @@ +.\" Automatically generated by Pod::Man version 1.15 +.\" Thu May 9 13:17:55 2002 +.\" +.\" Standard preamble: +.\" ====================================================================== +.de Sh \" Subsection heading +.br +.if t .Sp +.ne 5 +.PP +\fB\\$1\fR +.PP +.. +.de Sp \" Vertical space (when we can't use .PP) +.if t .sp .5v +.if n .sp +.. +.de Ip \" List item +.br +.ie \\n(.$>=3 .ne \\$3 +.el .ne 3 +.IP "\\$1" \\$2 +.. +.de Vb \" Begin verbatim text +.ft CW +.nf +.ne \\$1 +.. +.de Ve \" End verbatim text +.ft R + +.fi +.. +.\" Set up some character translations and predefined strings. \*(-- will +.\" give an unbreakable dash, \*(PI will give pi, \*(L" will give a left +.\" double quote, and \*(R" will give a right double quote. | will give a +.\" real vertical bar. \*(C+ will give a nicer C++. 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They generate a random key and then \*(L"envelope\*(R" it by +using public key encryption. Data can then be encrypted using this +key. +.PP +\&\fIEVP_SealInit()\fR initializes a cipher context \fBctx\fR for encryption +with cipher \fBtype\fR using a random secret key and \s-1IV\s0 supplied in +the \fBiv\fR parameter. \fBtype\fR is normally supplied by a function such +as \fIEVP_des_cbc()\fR. The secret key is encrypted using one or more public +keys, this allows the same encrypted data to be decrypted using any +of the corresponding private keys. \fBek\fR is an array of buffers where +the public key encrypted secret key will be written, each buffer must +contain enough room for the corresponding encrypted key: that is +\&\fBek[i]\fR must have room for \fBEVP_PKEY_size(pubk[i])\fR bytes. The actual +size of each encrypted secret key is written to the array \fBekl\fR. \fBpubk\fR is +an array of \fBnpubk\fR public keys. +.PP +\&\fIEVP_SealUpdate()\fR and \fIEVP_SealFinal()\fR have exactly the same properties +as the \fIEVP_EncryptUpdate()\fR and \fIEVP_EncryptFinal()\fR routines, as +documented on the EVP_EncryptInit(3) manual +page. +.SH "RETURN VALUES" +.IX Header "RETURN VALUES" +\&\fIEVP_SealInit()\fR returns 0 on error or \fBnpubk\fR if successful. +.PP +\&\fIEVP_SealUpdate()\fR and \fIEVP_SealFinal()\fR return 1 for success and 0 for +failure. +.SH "NOTES" +.IX Header "NOTES" +Because a random secret key is generated the random number generator +must be seeded before calling \fIEVP_SealInit()\fR. +.PP +The public key must be \s-1RSA\s0 because it is the only OpenSSL public key +algorithm that supports key transport. +.PP +Envelope encryption is the usual method of using public key encryption +on large amounts of data, this is because public key encryption is slow +but symmetric encryption is fast. So symmetric encryption is used for +bulk encryption and the small random symmetric key used is transferred +using public key encryption. +.PP +It is possible to call \fIEVP_SealInit()\fR twice in the same way as +\&\fIEVP_EncryptInit()\fR. The first call should have \fBnpubk\fR set to 0 +and (after setting any cipher parameters) it should be called again +with \fBtype\fR set to \s-1NULL\s0. +.SH "SEE ALSO" +.IX Header "SEE ALSO" +evp(3), rand(3), +EVP_EncryptInit(3), +EVP_OpenInit(3) +.SH "HISTORY" +.IX Header "HISTORY" |
