1 .\" $NetBSD: EVP_OpenInit.3,v 1.14 2015/06/12 17:01:13 christos Exp $
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137 .IX Title "EVP_OpenInit 3"
138 .TH EVP_OpenInit 3 "2009-07-19" "1.0.1n" "OpenSSL"
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144 EVP_OpenInit, EVP_OpenUpdate, EVP_OpenFinal \- EVP envelope decryption
148 .IX Header "SYNOPSIS"
150 \& #include <openssl/evp.h>
152 \& int EVP_OpenInit(EVP_CIPHER_CTX *ctx,EVP_CIPHER *type,unsigned char *ek,
153 \& int ekl,unsigned char *iv,EVP_PKEY *priv);
154 \& int EVP_OpenUpdate(EVP_CIPHER_CTX *ctx, unsigned char *out,
155 \& int *outl, unsigned char *in, int inl);
156 \& int EVP_OpenFinal(EVP_CIPHER_CTX *ctx, unsigned char *out,
160 .IX Header "DESCRIPTION"
161 The \s-1EVP\s0 envelope routines are a high level interface to envelope
162 decryption. They decrypt a public key encrypted symmetric key and
163 then decrypt data using it.
165 \&\fIEVP_OpenInit()\fR initializes a cipher context \fBctx\fR for decryption
166 with cipher \fBtype\fR. It decrypts the encrypted symmetric key of length
167 \&\fBekl\fR bytes passed in the \fBek\fR parameter using the private key \fBpriv\fR.
168 The \s-1IV\s0 is supplied in the \fBiv\fR parameter.
170 \&\fIEVP_OpenUpdate()\fR and \fIEVP_OpenFinal()\fR have exactly the same properties
171 as the \fIEVP_DecryptUpdate()\fR and \fIEVP_DecryptFinal()\fR routines, as
172 documented on the \fIEVP_EncryptInit\fR\|(3) manual
176 It is possible to call \fIEVP_OpenInit()\fR twice in the same way as
177 \&\fIEVP_DecryptInit()\fR. The first call should have \fBpriv\fR set to \s-1NULL\s0
178 and (after setting any cipher parameters) it should be called again
179 with \fBtype\fR set to \s-1NULL.\s0
181 If the cipher passed in the \fBtype\fR parameter is a variable length
182 cipher then the key length will be set to the value of the recovered
183 key length. If the cipher is a fixed length cipher then the recovered
184 key length must match the fixed cipher length.
186 .IX Header "RETURN VALUES"
187 \&\fIEVP_OpenInit()\fR returns 0 on error or a non zero integer (actually the
188 recovered secret key size) if successful.
190 \&\fIEVP_OpenUpdate()\fR returns 1 for success or 0 for failure.
192 \&\fIEVP_OpenFinal()\fR returns 0 if the decrypt failed or 1 for success.
194 .IX Header "SEE ALSO"
195 \&\fIopenssl_evp\fR\|(3), \fIopenssl_rand\fR\|(3),
196 \&\fIEVP_EncryptInit\fR\|(3),
197 \&\fIEVP_SealInit\fR\|(3)