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134 .IX Title "EVP_OpenInit 3"
135 .TH EVP_OpenInit 3 "2009-04-11" "0.9.8k" "OpenSSL"
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141 EVP_OpenInit, EVP_OpenUpdate, EVP_OpenFinal \- EVP envelope decryption
143 .IX Header "SYNOPSIS"
145 \& #include <openssl/evp.h>
147 \& int EVP_OpenInit(EVP_CIPHER_CTX *ctx,EVP_CIPHER *type,unsigned char *ek,
148 \& int ekl,unsigned char *iv,EVP_PKEY *priv);
149 \& int EVP_OpenUpdate(EVP_CIPHER_CTX *ctx, unsigned char *out,
150 \& int *outl, unsigned char *in, int inl);
151 \& int EVP_OpenFinal(EVP_CIPHER_CTX *ctx, unsigned char *out,
155 .IX Header "DESCRIPTION"
156 The \s-1EVP\s0 envelope routines are a high level interface to envelope
157 decryption. They decrypt a public key encrypted symmetric key and
158 then decrypt data using it.
160 \&\fIEVP_OpenInit()\fR initializes a cipher context \fBctx\fR for decryption
161 with cipher \fBtype\fR. It decrypts the encrypted symmetric key of length
162 \&\fBekl\fR bytes passed in the \fBek\fR parameter using the private key \fBpriv\fR.
163 The \s-1IV\s0 is supplied in the \fBiv\fR parameter.
165 \&\fIEVP_OpenUpdate()\fR and \fIEVP_OpenFinal()\fR have exactly the same properties
166 as the \fIEVP_DecryptUpdate()\fR and \fIEVP_DecryptFinal()\fR routines, as
167 documented on the \fIEVP_EncryptInit\fR\|(3) manual
171 It is possible to call \fIEVP_OpenInit()\fR twice in the same way as
172 \&\fIEVP_DecryptInit()\fR. The first call should have \fBpriv\fR set to \s-1NULL\s0
173 and (after setting any cipher parameters) it should be called again
174 with \fBtype\fR set to \s-1NULL\s0.
176 If the cipher passed in the \fBtype\fR parameter is a variable length
177 cipher then the key length will be set to the value of the recovered
178 key length. If the cipher is a fixed length cipher then the recovered
179 key length must match the fixed cipher length.
181 .IX Header "RETURN VALUES"
182 \&\fIEVP_OpenInit()\fR returns 0 on error or a non zero integer (actually the
183 recovered secret key size) if successful.
185 \&\fIEVP_OpenUpdate()\fR returns 1 for success or 0 for failure.
187 \&\fIEVP_OpenFinal()\fR returns 0 if the decrypt failed or 1 for success.
189 .IX Header "SEE ALSO"
190 \&\fIevp\fR\|(3), \fIrand\fR\|(3),
191 \&\fIEVP_EncryptInit\fR\|(3),
192 \&\fIEVP_SealInit\fR\|(3)