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Title "EVP_OpenInit 3" For nroff, turn off justification. Always turn off hyphenation; it makes
way too many mistakes in technical documents.
EVP_OpenInit, EVP_OpenUpdate, EVP_OpenFinal - EVP envelope decryption Header "SYNOPSIS" .Vb 1 #include <openssl/evp.h> \& int EVP_OpenInit(EVP_CIPHER_CTX *ctx,EVP_CIPHER *type,unsigned char *ek, int ekl,unsigned char *iv,EVP_PKEY *priv); int EVP_OpenUpdate(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl, unsigned char *in, int inl); int EVP_OpenFinal(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl); .Ve Header "DESCRIPTION" The \s-1EVP\s0 envelope routines are a high level interface to envelope decryption. They decrypt a public key encrypted symmetric key and then decrypt data using it.

\fIEVP_OpenInit() initializes a cipher context ctx for decryption with cipher type. It decrypts the encrypted symmetric key of length \fBekl bytes passed in the ek parameter using the private key priv. The \s-1IV\s0 is supplied in the iv parameter.

\fIEVP_OpenUpdate() and EVP_OpenFinal() have exactly the same properties as the EVP_DecryptUpdate() and EVP_DecryptFinal() routines, as documented on the EVP_EncryptInit\|(3) manual page.

Header "NOTES" It is possible to call EVP_OpenInit() twice in the same way as \fIEVP_DecryptInit(). The first call should have priv set to \s-1NULL\s0 and (after setting any cipher parameters) it should be called again with type set to \s-1NULL.\s0

If the cipher passed in the type parameter is a variable length cipher then the key length will be set to the value of the recovered key length. If the cipher is a fixed length cipher then the recovered key length must match the fixed cipher length.

Header "RETURN VALUES" \fIEVP_OpenInit() returns 0 on error or a non zero integer (actually the recovered secret key size) if successful.

\fIEVP_OpenUpdate() returns 1 for success or 0 for failure.

\fIEVP_OpenFinal() returns 0 if the decrypt failed or 1 for success.

Header "SEE ALSO" \fIevp\|(3), rand\|(3), \fIEVP_EncryptInit\|(3), \fIEVP_SealInit\|(3) Header "HISTORY"