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EVP_OpenFinal.3
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.\" Automatically generated by Pod::Man 4.11 (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_OpenInit, EVP_OpenUpdate, EVP_OpenFinal \- EVP envelope decryption .SH "SYNOPSIS" .IX Header "SYNOPSIS" .Vb 1 \& #include <openssl/evp.h> \& \& int EVP_OpenInit(EVP_CIPHER_CTX *ctx,EVP_CIPHER *type,unsigned char *ek, \& int ekl,unsigned char *iv,EVP_PKEY *priv); \& int EVP_OpenUpdate(EVP_CIPHER_CTX *ctx, unsigned char *out, \& int *outl, unsigned char *in, int inl); \& int EVP_OpenFinal(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 decryption. They decrypt a public key encrypted symmetric key and then decrypt data using it. .PP \&\fBEVP_OpenInit()\fR initializes a cipher context \fBctx\fR for decryption with cipher \fBtype\fR. It decrypts the encrypted symmetric key of length \&\fBekl\fR bytes passed in the \fBek\fR parameter using the private key \fBpriv\fR. The \s-1IV\s0 is supplied in the \fBiv\fR parameter. .PP \&\fBEVP_OpenUpdate()\fR and \fBEVP_OpenFinal()\fR have exactly the same properties as the \fBEVP_DecryptUpdate()\fR and \fBEVP_DecryptFinal()\fR routines, as documented on the \fBEVP_EncryptInit\fR\|(3) manual page. .SH "NOTES" .IX Header "NOTES" It is possible to call \fBEVP_OpenInit()\fR twice in the same way as \&\fBEVP_DecryptInit()\fR. The first call should have \fBpriv\fR set to \s-1NULL\s0 and (after setting any cipher parameters) it should be called again with \fBtype\fR set to \s-1NULL.\s0 .PP If the cipher passed in the \fBtype\fR parameter is a variable length cipher then the key length will be set to the value of the recovered key length. If the cipher is a fixed length cipher then the recovered key length must match the fixed cipher length. .SH "RETURN VALUES" .IX Header "RETURN VALUES" \&\fBEVP_OpenInit()\fR returns 0 on error or a non zero integer (actually the recovered secret key size) if successful. .PP \&\fBEVP_OpenUpdate()\fR returns 1 for success or 0 for failure. .PP \&\fBEVP_OpenFinal()\fR returns 0 if the decrypt failed or 1 for success. .SH "SEE ALSO" .IX Header "SEE ALSO" \&\fBevp\fR\|(3), \fBrand\fR\|(3), \&\fBEVP_EncryptInit\fR\|(3), \&\fBEVP_SealInit\fR\|(3) .SH "HISTORY" .IX Header "HISTORY"