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126 .IX Title "EVP_OpenInit 3"
127 .TH EVP_OpenInit 3 "2014-04-07" "1.0.1g" "OpenSSL"
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133 EVP_OpenInit, EVP_OpenUpdate, EVP_OpenFinal \- EVP envelope decryption
135 .IX Header "SYNOPSIS"
137 \& #include <openssl/evp.h>
139 \& int EVP_OpenInit(EVP_CIPHER_CTX *ctx,EVP_CIPHER *type,unsigned char *ek,
140 \& int ekl,unsigned char *iv,EVP_PKEY *priv);
141 \& int EVP_OpenUpdate(EVP_CIPHER_CTX *ctx, unsigned char *out,
142 \& int *outl, unsigned char *in, int inl);
143 \& int EVP_OpenFinal(EVP_CIPHER_CTX *ctx, unsigned char *out,
147 .IX Header "DESCRIPTION"
148 The \s-1EVP\s0 envelope routines are a high level interface to envelope
149 decryption. They decrypt a public key encrypted symmetric key and
150 then decrypt data using it.
152 \&\fIEVP_OpenInit()\fR initializes a cipher context \fBctx\fR for decryption
153 with cipher \fBtype\fR. It decrypts the encrypted symmetric key of length
154 \&\fBekl\fR bytes passed in the \fBek\fR parameter using the private key \fBpriv\fR.
155 The \s-1IV\s0 is supplied in the \fBiv\fR parameter.
157 \&\fIEVP_OpenUpdate()\fR and \fIEVP_OpenFinal()\fR have exactly the same properties
158 as the \fIEVP_DecryptUpdate()\fR and \fIEVP_DecryptFinal()\fR routines, as
159 documented on the \fIEVP_EncryptInit\fR\|(3) manual
163 It is possible to call \fIEVP_OpenInit()\fR twice in the same way as
164 \&\fIEVP_DecryptInit()\fR. The first call should have \fBpriv\fR set to \s-1NULL\s0
165 and (after setting any cipher parameters) it should be called again
166 with \fBtype\fR set to \s-1NULL\s0.
168 If the cipher passed in the \fBtype\fR parameter is a variable length
169 cipher then the key length will be set to the value of the recovered
170 key length. If the cipher is a fixed length cipher then the recovered
171 key length must match the fixed cipher length.
173 .IX Header "RETURN VALUES"
174 \&\fIEVP_OpenInit()\fR returns 0 on error or a non zero integer (actually the
175 recovered secret key size) if successful.
177 \&\fIEVP_OpenUpdate()\fR returns 1 for success or 0 for failure.
179 \&\fIEVP_OpenFinal()\fR returns 0 if the decrypt failed or 1 for success.
181 .IX Header "SEE ALSO"
182 \&\fIevp\fR\|(3), \fIrand\fR\|(3),
183 \&\fIEVP_EncryptInit\fR\|(3),
184 \&\fIEVP_SealInit\fR\|(3)