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Diffstat (limited to 'secure/lib/libcrypto/man/EVP_SealInit.3')
| -rw-r--r-- | secure/lib/libcrypto/man/EVP_SealInit.3 | 212 |
1 files changed, 212 insertions, 0 deletions
diff --git a/secure/lib/libcrypto/man/EVP_SealInit.3 b/secure/lib/libcrypto/man/EVP_SealInit.3 new file mode 100644 index 000000000000..35e66f2c6a57 --- /dev/null +++ b/secure/lib/libcrypto/man/EVP_SealInit.3 @@ -0,0 +1,212 @@ +.\" Automatically generated by Pod::Man 4.09 (Pod::Simple 3.35) +.\" +.\" Standard preamble: +.\" ======================================================================== +.de Sp \" Vertical space (when we can't use .PP) +.if t .sp .5v +.if n .sp +.. +.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. \*(C+ will +.\" give a nicer C++. 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Always turn off hyphenation; it makes +.\" way too many mistakes in technical documents. +.if n .ad l +.nh +.SH "NAME" +EVP_SealInit, EVP_SealUpdate, EVP_SealFinal \- EVP envelope encryption +.SH "SYNOPSIS" +.IX Header "SYNOPSIS" +.Vb 1 +\& #include <openssl/evp.h> +\& +\& int EVP_SealInit(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *type, +\& unsigned char **ek, int *ekl, unsigned char *iv, +\& EVP_PKEY **pubk, int npubk); +\& int EVP_SealUpdate(EVP_CIPHER_CTX *ctx, unsigned char *out, +\& int *outl, unsigned char *in, int inl); +\& int EVP_SealFinal(EVP_CIPHER_CTX *ctx, unsigned char *out, +\& int *outl); +.Ve +.SH "DESCRIPTION" +.IX Header "DESCRIPTION" +The \s-1EVP\s0 envelope routines are a high level interface to envelope +encryption. They generate a random key and \s-1IV\s0 (if required) 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 \fBtype\fR is normally +supplied by a function such as \fIEVP_aes_256_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 +The \fBiv\fR parameter is a buffer where the generated \s-1IV\s0 is written to. It must +contain enough room for the corresponding cipher's \s-1IV,\s0 as determined by (for +example) EVP_CIPHER_iv_length(type). +.PP +If the cipher does not require an \s-1IV\s0 then the \fBiv\fR parameter is ignored +and can be \fB\s-1NULL\s0\fR. +.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 \fIEVP_EncryptInit\fR\|(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" +\&\fIevp\fR\|(3), \fIrand\fR\|(3), +\&\fIEVP_EncryptInit\fR\|(3), +\&\fIEVP_OpenInit\fR\|(3) +.SH "HISTORY" +.IX Header "HISTORY" +\&\fIEVP_SealFinal()\fR did not return a value before OpenSSL 0.9.7. |