Update files for OpenSSL-1.0.0f import.
[dragonfly.git] / secure / lib / libcrypto / man / EVP_OpenInit.3
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124.\" ========================================================================
125.\"
126.IX Title "EVP_OpenInit 3"
e3261593 127.TH EVP_OpenInit 3 "2012-01-04" "1.0.0f" "OpenSSL"
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128.\" For nroff, turn off justification. Always turn off hyphenation; it makes
129.\" way too many mistakes in technical documents.
130.if n .ad l
131.nh
984263bc 132.SH "NAME"
74dab6c2 133EVP_OpenInit, EVP_OpenUpdate, EVP_OpenFinal \- EVP envelope decryption
984263bc 134.SH "SYNOPSIS"
8b0cefbb 135.IX Header "SYNOPSIS"
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136.Vb 1
137\& #include <openssl/evp.h>
e257b235 138\&
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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,
144\& int *outl);
145.Ve
146.SH "DESCRIPTION"
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147.IX Header "DESCRIPTION"
148The \s-1EVP\s0 envelope routines are a high level interface to envelope
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149decryption. They decrypt a public key encrypted symmetric key and
150then decrypt data using it.
151.PP
8b0cefbb 152\&\fIEVP_OpenInit()\fR initializes a cipher context \fBctx\fR for decryption
984263bc 153with cipher \fBtype\fR. It decrypts the encrypted symmetric key of length
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154\&\fBekl\fR bytes passed in the \fBek\fR parameter using the private key \fBpriv\fR.
155The \s-1IV\s0 is supplied in the \fBiv\fR parameter.
984263bc 156.PP
8b0cefbb 157\&\fIEVP_OpenUpdate()\fR and \fIEVP_OpenFinal()\fR have exactly the same properties
984263bc 158as the \fIEVP_DecryptUpdate()\fR and \fIEVP_DecryptFinal()\fR routines, as
8b0cefbb 159documented on the \fIEVP_EncryptInit\fR\|(3) manual
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160page.
161.SH "NOTES"
8b0cefbb 162.IX Header "NOTES"
984263bc 163It is possible to call \fIEVP_OpenInit()\fR twice in the same way as
8b0cefbb 164\&\fIEVP_DecryptInit()\fR. The first call should have \fBpriv\fR set to \s-1NULL\s0
984263bc 165and (after setting any cipher parameters) it should be called again
8b0cefbb 166with \fBtype\fR set to \s-1NULL\s0.
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167.PP
168If the cipher passed in the \fBtype\fR parameter is a variable length
169cipher then the key length will be set to the value of the recovered
170key length. If the cipher is a fixed length cipher then the recovered
171key length must match the fixed cipher length.
172.SH "RETURN VALUES"
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173.IX Header "RETURN VALUES"
174\&\fIEVP_OpenInit()\fR returns 0 on error or a non zero integer (actually the
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175recovered secret key size) if successful.
176.PP
8b0cefbb 177\&\fIEVP_OpenUpdate()\fR returns 1 for success or 0 for failure.
984263bc 178.PP
8b0cefbb 179\&\fIEVP_OpenFinal()\fR returns 0 if the decrypt failed or 1 for success.
984263bc 180.SH "SEE ALSO"
74dab6c2 181.IX Header "SEE ALSO"
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182\&\fIevp\fR\|(3), \fIrand\fR\|(3),
183\&\fIEVP_EncryptInit\fR\|(3),
184\&\fIEVP_SealInit\fR\|(3)
185.SH "HISTORY"
984263bc 186.IX Header "HISTORY"