SecKeyCreateFromData(_:_:_:)

Declaration

func SecKeyCreateFromData(_ parameters: CFDictionary, _ keyData: CFData, _ error: UnsafeMutablePointer<Unmanaged<CFError>?>?) -> SecKey?

Parameters

• parameters:

  A parameter dictionary that describes the key. See the discussion for details.

• keyData:

  A CFDataRef object that contains the raw key data.

• error:

  A pointer to a Cferror variable where an error object is stored upon failure. If not NULL, the caller is responsible for checking this variable and releasing the resulting object if it exists.

Return Value

A symmetric key. In Objective-C, call the CFRelease function to free the key’s memory when you are done with it.

Discussion

The parameters dictionary must contain (at minimum) an entry for the kSecAttrKeyType key with a value of kSecAttrKeyTypeAES or any other key type defined in Key Type Value.

The keys below may be optionally set in the parameters dictionary (with a CFBooleanRef value) to override the default key usage values:

• kSecAttrCanEncrypt

• kSecAttrCanDecrypt

• kSecAttrCanWrap

• kSecAttrCanUnwrap

These values default to true if no value is specified.