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[dragonfly.git] / secure / lib / libcrypto / man / EVP_OpenInit.3
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42.ds -- \(*W-
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48''' \*(M", \*(S", \*(N" and \*(T" are the equivalent of
49''' \*(L" and \*(R", except that they are used on ".xx" lines,
50''' such as .IP and .SH, which do another additional levels of
51''' double-quote interpretation
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80.\" If the F register is turned on, we'll generate
81.\" index entries out stderr for the following things:
82.\" TH Title
83.\" SH Header
84.\" Sh Subsection
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96.TH EVP_OpenInit 3 "0.9.7d" "2/Sep/2004" "OpenSSL"
97.UC
98.if n .hy 0
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120.\}
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139.\}
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188.\}
189.rm #[ #] #H #V #F C
984263bc 190.SH "NAME"
74dab6c2 191EVP_OpenInit, EVP_OpenUpdate, EVP_OpenFinal \- EVP envelope decryption
984263bc 192.SH "SYNOPSIS"
74dab6c2 193.PP
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194.Vb 1
195\& #include <openssl/evp.h>
196.Ve
197.Vb 6
198\& int EVP_OpenInit(EVP_CIPHER_CTX *ctx,EVP_CIPHER *type,unsigned char *ek,
199\& int ekl,unsigned char *iv,EVP_PKEY *priv);
200\& int EVP_OpenUpdate(EVP_CIPHER_CTX *ctx, unsigned char *out,
201\& int *outl, unsigned char *in, int inl);
202\& int EVP_OpenFinal(EVP_CIPHER_CTX *ctx, unsigned char *out,
203\& int *outl);
204.Ve
205.SH "DESCRIPTION"
74dab6c2 206The EVP envelope routines are a high level interface to envelope
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207decryption. They decrypt a public key encrypted symmetric key and
208then decrypt data using it.
209.PP
74dab6c2 210\fIEVP_OpenInit()\fR initializes a cipher context \fBctx\fR for decryption
984263bc 211with cipher \fBtype\fR. It decrypts the encrypted symmetric key of length
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212\fBekl\fR bytes passed in the \fBek\fR parameter using the private key \fBpriv\fR.
213The IV is supplied in the \fBiv\fR parameter.
984263bc 214.PP
74dab6c2 215\fIEVP_OpenUpdate()\fR and \fIEVP_OpenFinal()\fR have exactly the same properties
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216as the \fIEVP_DecryptUpdate()\fR and \fIEVP_DecryptFinal()\fR routines, as
217documented on the EVP_EncryptInit(3) manual
218page.
219.SH "NOTES"
984263bc 220It is possible to call \fIEVP_OpenInit()\fR twice in the same way as
74dab6c2 221\fIEVP_DecryptInit()\fR. The first call should have \fBpriv\fR set to NULL
984263bc 222and (after setting any cipher parameters) it should be called again
74dab6c2 223with \fBtype\fR set to NULL.
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224.PP
225If the cipher passed in the \fBtype\fR parameter is a variable length
226cipher then the key length will be set to the value of the recovered
227key length. If the cipher is a fixed length cipher then the recovered
228key length must match the fixed cipher length.
229.SH "RETURN VALUES"
74dab6c2 230\fIEVP_OpenInit()\fR returns 0 on error or a non zero integer (actually the
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231recovered secret key size) if successful.
232.PP
74dab6c2 233\fIEVP_OpenUpdate()\fR returns 1 for success or 0 for failure.
984263bc 234.PP
74dab6c2 235\fIEVP_OpenFinal()\fR returns 0 if the decrypt failed or 1 for success.
984263bc 236.SH "SEE ALSO"
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237evp(3), rand(3),
238EVP_EncryptInit(3),
239EVP_SealInit(3)
240.SH "HISTORY"
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241
242.rn }` ''
243.IX Title "EVP_OpenInit 3"
244.IX Name "EVP_OpenInit, EVP_OpenUpdate, EVP_OpenFinal - EVP envelope decryption"
245
246.IX Header "NAME"
247
248.IX Header "SYNOPSIS"
249
250.IX Header "DESCRIPTION"
251
252.IX Header "NOTES"
253
254.IX Header "RETURN VALUES"
255
256.IX Header "SEE ALSO"
257
984263bc 258.IX Header "HISTORY"
74dab6c2 259