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EVP_OpenInit.3
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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\|(7), \fBRAND_bytes\fR\|(3), \&\fBEVP_EncryptInit\fR\|(3), \&\fBEVP_SealInit\fR\|(3) .SH "COPYRIGHT" .IX Header "COPYRIGHT" Copyright 2000\-2020 The OpenSSL Project Authors. All Rights Reserved. .PP Licensed under the OpenSSL license (the \*(L"License\*(R"). You may not use this file except in compliance with the License. You can obtain a copy in the file \s-1LICENSE\s0 in the source distribution or at <https://www.openssl.org/source/license.html>.
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