func testConstruction() (*chow.Construction, []byte) {
key := test_vectors.AESVectors[50].Key
seed := test_vectors.AESVectors[51].Key
constr, _, _ := chow.GenerateEncryptionKeys(key, seed, chow.SameMasks(chow.IdentityMask))
return &constr, key
}
func ExtractKey(cand ast.Expr) ([]byte, bool) {
// Verify expression contains a byte slice.
compositeLit, ok := cand.(*ast.CompositeLit)
if !ok {
return nil, false
}
arrayType, ok := compositeLit.Type.(*ast.ArrayType)
if !ok {
return nil, false
}
elt, ok := arrayType.Elt.(*ast.Ident)
if !ok || elt.Name != "byte" || elt.Obj != nil {
return nil, false
}
// Extract raw key.
key := []byte{}
for _, e := range compositeLit.Elts {
basicLit, ok := e.(*ast.BasicLit)
if !ok || basicLit.Kind != token.INT {
return nil, false
}
num, err := strconv.ParseUint(basicLit.Value, 0, 8)
if err != nil {
return nil, false
}
key = append(key, byte(num))
}
if len(key) != 16 {
return nil, false
}
// Mask key.
seed := make([]byte, 16)
rand.Read(seed)
constr, _, _ := chow.GenerateEncryptionKeys(key, seed, chow.SameMasks(chow.IdentityMask))
return constr.Serialize(), true
}