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-.Dd $Mdocdate: November 11 2015 $
-.Dt CMS_GET0_RECIPIENTINFOS 3
-.Os
-.Sh NAME
-.Nm CMS_get0_RecipientInfos ,
-.Nm CMS_RecipientInfo_type ,
-.Nm CMS_RecipientInfo_ktri_get0_signer_id ,
-.Nm CMS_RecipientInfo_ktri_cert_cmp ,
-.Nm CMS_RecipientInfo_set0_pkey ,
-.Nm CMS_RecipientInfo_kekri_get0_id ,
-.Nm CMS_RecipientInfo_kekri_id_cmp ,
-.Nm CMS_RecipientInfo_set0_key ,
-.Nm CMS_RecipientInfo_decrypt ,
-.Nm CMS_RecipientInfo_encrypt
-.Nd CMS envelopedData RecipientInfo routines
-.Sh SYNOPSIS
-.In openssl/cms.h
-.Ft STACK_OF(CMS_RecipientInfo) *
-.Fo CMS_get0_RecipientInfos
-.Fa "CMS_ContentInfo *cms"
-.Fc
-.Ft int
-.Fo CMS_RecipientInfo_type
-.Fa "CMS_RecipientInfo *ri"
-.Fc
-.Ft int
-.Fo CMS_RecipientInfo_ktri_get0_signer_id
-.Fa "CMS_RecipientInfo *ri"
-.Fa "ASN1_OCTET_STRING **keyid"
-.Fa "X509_NAME **issuer"
-.Fa "ASN1_INTEGER **sno"
-.Fc
-.Ft int
-.Fo CMS_RecipientInfo_ktri_cert_cmp
-.Fa "CMS_RecipientInfo *ri"
-.Fa "X509 *cert"
-.Fc
-.Ft int
-.Fo CMS_RecipientInfo_set0_pkey
-.Fa "CMS_RecipientInfo *ri"
-.Fa "EVP_PKEY *pkey"
-.Fc
-.Ft int
-.Fo CMS_RecipientInfo_kekri_get0_id
-.Fa "CMS_RecipientInfo *ri"
-.Fa "X509_ALGOR **palg"
-.Fa "ASN1_OCTET_STRING **pid"
-.Fa "ASN1_GENERALIZEDTIME **pdate"
-.Fa "ASN1_OBJECT **potherid"
-.Fa "ASN1_TYPE **pothertype"
-.Fc
-.Ft int
-.Fo CMS_RecipientInfo_kekri_id_cmp
-.Fa "CMS_RecipientInfo *ri"
-.Fa "const unsigned char *id"
-.Fa "size_t idlen"
-.Fc
-.Ft int
-.Fo CMS_RecipientInfo_set0_key
-.Fa "CMS_RecipientInfo *ri"
-.Fa "unsigned char *key"
-.Fa "size_t keylen"
-.Fc
-.Ft int
-.Fo CMS_RecipientInfo_decrypt
-.Fa "CMS_ContentInfo *cms"
-.Fa "CMS_RecipientInfo *ri"
-.Fc
-.Sh DESCRIPTION
-The function
-.Fn CMS_get0_RecipientInfos
-returns all the
-.Vt CMS_RecipientInfo
-structures associated with a CMS EnvelopedData structure.
-.Pp
-.Fn CMS_RecipientInfo_type
-returns the type of the
-.Vt CMS_RecipientInfo
-structure
-.Fa ri .
-It will currently return
-.Dv CMS_RECIPINFO_TRANS ,
-.Dv CMS_RECIPINFO_AGREE ,
-.Dv CMS_RECIPINFO_KEK ,
-.Dv CMS_RECIPINFO_PASS ,
-or
-.Dv CMS_RECIPINFO_OTHER .
-.Pp
-.Fn CMS_RecipientInfo_ktri_get0_signer_id
-retrieves the certificate recipient identifier associated with a
-specific
-.Vt CMS_RecipientInfo
-structure
-.Fa ri ,
-which must be of type
-.Dv CMS_RECIPINFO_TRANS .
-Either the keyidentifier will be set in
-.Fa keyid
-or
-.Em both
-issuer name and serial number in
-.Fa issuer
-and
-.Fa sno .
-.Pp
-.Fn CMS_RecipientInfo_ktri_cert_cmp
-compares the certificate
-.Fa cert
-against the
-.Vt CMS_RecipientInfo
-structure
-.Fa ri ,
-which must be of type
-.Dv CMS_RECIPINFO_TRANS .
-It returns zero if the
-comparison is successful and non zero if not.
-.Pp
-.Fn CMS_RecipientInfo_set0_pkey
-associates the private key
-.Fa pkey
-with the
-.Vt CMS_RecipientInfo
-structure
-.Fa ri ,
-which must be of type
-.Dv CMS_RECIPINFO_TRANS .
-.Pp
-.Fn CMS_RecipientInfo_kekri_get0_id
-retrieves the key information from the
-.Vt CMS_RecipientInfo
-structure
-.Fa ri
-which must be of type
-.Dv CMS_RECIPINFO_KEK .
-Any of the remaining parameters can be
-.Dv NULL
-if the application is not interested in the value of a field.
-Where a field is optional and absent,
-.Dv NULL
-will be written to the corresponding parameter.
-The
-.Sy keyEncryptionAlgorithm
-field is written to
-.Fa palg ,
-the
-.Sy keyIdentifier
-field is written to
-.Fa pid ,
-the
-.Sy date
-field if present is written to
-.Fa pdate ,
-if the
-.Sy other
-field is present the components
-.Sy keyAttrId
-and
-.Sy keyAttr
-are written to the parameters
-.Fa potherid
-and
-.Fa pothertype .
-.Pp
-.Fn CMS_RecipientInfo_kekri_id_cmp
-compares the ID in the
-.Fa id
-and
-.Fa idlen
-parameters against the
-.Sy keyIdentifier
-.Vt CMS_RecipientInfo
-structure
-.Fa ri ,
-which must be of type
-.Dv CMS_RECIPINFO_KEK .
-It returns zero if the comparison is successful and non zero if not.
-.Pp
-.Fn CMS_RecipientInfo_set0_key
-associates the symmetric key
-.Fa key
-of length
-.Fa keylen
-with the
-.Vt CMS_RecipientInfo
-structure
-.Fa ri ,
-which must be of type
-.Dv CMS_RECIPINFO_KEK .
-.Pp
-.Fn CMS_RecipientInfo_decrypt
-attempts to decrypt the
-.Vt CMS_RecipientInfo
-structure
-.Fa ri
-in structure
-.Fa cms .
-A key must have been associated with the structure first.
-.Sh NOTES
-The main purpose of these functions is to enable an application to
-lookup recipient keys using any appropriate technique when the simpler
-method of
-.Xr CMS_decrypt 3
-is not appropriate.
-.Pp
-In typical usage, an application will retrieve all
-.Vt CMS_RecipientInfo
-structures using
-.Fn CMS_get0_RecipientInfos
-and check the type of each using
-.Fn CMS_RecipientInfo_type .
-Depending on the type, the
-.Vt CMS_RecipientInfo
-structure can be ignored or its key identifier data retrieved using
-an appropriate function.
-Then if the corresponding secret or private key can be obtained by any
-appropriate means it can then associated with the structure and
-.Xr CMS_RecpientInfo_decrypt 3
-called.
-If successful,
-.Xr CMS_decrypt 3
-can be called with a
-.Dv NULL
-key to decrypt the enveloped content.
-.Sh RETURN VALUES
-.Fn CMS_get0_RecipientInfos
-returns all
-.Vt CMS_RecipientInfo
-structures, or
-.Dv NULL
-if an error occurs.
-.Pp
-.Fn CMS_RecipientInfo_ktri_get0_signer_id ,
-.Fn CMS_RecipientInfo_set0_pkey ,
-.Fn CMS_RecipientInfo_kekri_get0_id ,
-.Fn CMS_RecipientInfo_set0_key ,
-and
-.Fn CMS_RecipientInfo_decrypt
-return 1 for success or 0 if an error occurs.
-.Pp
-.Fn CMS_RecipientInfo_ktri_cert_cmp
-and
-.Fn CMS_RecipientInfo_kekri_id_cmp
-return 0 for a successful comparison and non zero otherwise.
-.Pp
-Any error can be obtained from
-.Xr ERR_get_error 3 .
-.Sh SEE ALSO
-.Xr CMS_decrypt 3 ,
-.Xr ERR_get_error 3
-.Sh HISTORY
-These functions were first was added to OpenSSL 0.9.8.