203 lines
6.0 KiB
Groff
203 lines
6.0 KiB
Groff
.\" $NetBSD: EVP_OpenInit.3,v 1.5 2001/04/12 10:45:37 itojun Exp $
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.\" ======================================================================
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.\"
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.IX Title "EVP_OpenInit 3"
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.TH EVP_OpenInit 3 "0.9.6a" "2001-04-12" "OpenSSL"
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.UC
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.SH "NAME"
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EVP_OpenInit, EVP_OpenUpdate, EVP_OpenFinal \- \s-1EVP\s0 envelope decryption
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.SH "LIBRARY"
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libcrypto, -lcrypto
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.SH "SYNOPSIS"
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.IX Header "SYNOPSIS"
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.Vb 1
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\& #include <openssl/evp.h>
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.Ve
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.Vb 6
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\& int EVP_OpenInit(EVP_CIPHER_CTX *ctx,EVP_CIPHER *type,unsigned char *ek,
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\& int ekl,unsigned char *iv,EVP_PKEY *priv);
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\& int EVP_OpenUpdate(EVP_CIPHER_CTX *ctx, unsigned char *out,
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\& int *outl, unsigned char *in, int inl);
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\& int EVP_OpenFinal(EVP_CIPHER_CTX *ctx, unsigned char *out,
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\& int *outl);
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.Ve
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.SH "DESCRIPTION"
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.IX Header "DESCRIPTION"
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The \s-1EVP\s0 envelope routines are a high level interface to envelope
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decryption. They decrypt a public key encrypted symmetric key and
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then decrypt data using it.
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.PP
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\&\fIEVP_OpenInit()\fR initializes a cipher context \fBctx\fR for decryption
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with cipher \fBtype\fR. It decrypts the encrypted symmetric key of length
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\&\fBekl\fR bytes passed in the \fBek\fR parameter using the private key \fBpriv\fR.
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The \s-1IV\s0 is supplied in the \fBiv\fR parameter.
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.PP
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\&\fIEVP_OpenUpdate()\fR and \fIEVP_OpenFinal()\fR have exactly the same properties
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as the \fIEVP_DecryptUpdate()\fR and \fIEVP_DecryptFinal()\fR routines, as
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documented on the EVP_EncryptInit(3) manual
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page.
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.SH "NOTES"
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.IX Header "NOTES"
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It is possible to call \fIEVP_OpenInit()\fR twice in the same way as
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\&\fIEVP_DecryptInit()\fR. The first call should have \fBpriv\fR set to \s-1NULL\s0
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and (after setting any cipher parameters) it should be called again
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with \fBtype\fR set to \s-1NULL\s0.
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.PP
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If the cipher passed in the \fBtype\fR parameter is a variable length
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cipher then the key length will be set to the value of the recovered
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key length. If the cipher is a fixed length cipher then the recovered
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key length must match the fixed cipher length.
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.SH "RETURN VALUES"
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.IX Header "RETURN VALUES"
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\&\fIEVP_OpenInit()\fR returns 0 on error or a non zero integer (actually the
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recovered secret key size) if successful.
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.PP
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\&\fIEVP_OpenUpdate()\fR returns 1 for success or 0 for failure.
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.PP
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\&\fIEVP_OpenFinal()\fR returns 0 if the decrypt failed or 1 for success.
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.SH "SEE ALSO"
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.IX Header "SEE ALSO"
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openssl_evp(3), openssl_rand(3),
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EVP_EncryptInit(3),
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EVP_SealInit(3)
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.SH "HISTORY"
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.IX Header "HISTORY"
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