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add documentation for state methods

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This commit is contained in:
collin 2020-11-12 12:29:47 -08:00
parent 1a45110e8e
commit 1a3020a9ca
6 changed files with 41 additions and 23 deletions
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16
state/src/local_data_commitment/local_data_commitment.rs
View File

@ -30,23 +30,25 @@ use snarkos_utilities::{bytes::ToBytes, to_bytes, FromBytes};
use std::convert::TryFrom;
/// Returns `true` if the path to the local data commitment leaf is a valid path in the record
/// commitment merkle tree.
pub fn verify_local_data_commitment(
system_parameters: &SystemParameters<Components>,
ast_input: &AstInput,
) -> Result<bool, LocalDataVerificationError> {
// verify record commitment
// verify record commitment.
let typed_record = ast_input.get_record();
let dpc_record_values = verify_record_commitment(system_parameters, typed_record)?;
let record_commitment: Vec<u8> = dpc_record_values.commitment;
let record_serial_number: Vec<u8> = dpc_record_values.serial_number;
// parse typed state values
// parse typed state values.
let typed_state = ast_input.get_state();
let state_values = StateValues::try_from(typed_state)?;
let leaf_index: u32 = state_values.leaf_index;
let root: Vec<u8> = state_values.root;
// parse typed state leaf values
// parse typed state leaf values.
let typed_state_leaf = ast_input.get_state_leaf();
let state_leaf_values = StateLeafValues::try_from(typed_state_leaf)?;
let path: Vec<u8> = state_leaf_values.path;
@ -54,7 +56,7 @@ pub fn verify_local_data_commitment(
let network_id: u8 = state_leaf_values.network_id;
let leaf_randomness: Vec<u8> = state_leaf_values.leaf_randomness;
// Select local data commitment input bytes
// Select local data commitment input bytes.
let is_death = leaf_index < (Components::NUM_INPUT_RECORDS as u32);
let input_bytes = if is_death {
to_bytes![record_serial_number, record_commitment, memo, network_id]?
@ -62,7 +64,7 @@ pub fn verify_local_data_commitment(
to_bytes![record_commitment, memo, network_id]?
};
// Construct local data commitment leaf
// Construct local data commitment leaf.
let local_data_leaf_randomness = <LocalDataCommitment as CommitmentScheme>::Randomness::read(&leaf_randomness[..])?;
let local_data_commitment_leaf = LocalDataCommitment::commit(
&system_parameters.local_data_commitment,
@ -70,10 +72,10 @@ pub fn verify_local_data_commitment(
&local_data_leaf_randomness,
)?;
// Construct record commitment merkle path
// Construct record commitment merkle path.
let local_data_merkle_path = CommitmentMerklePath::<LocalDataCommitment, LocalDataCRH>::read(&path[..])?;
// Check record commitment merkle path is valid for the given local data commitment root
// Check record commitment merkle path is valid for the given local data commitment root.
let local_data_commitment_root = <LocalDataCRH as CRH>::Output::read(&root[..])?;
let result = local_data_merkle_path.verify(
&system_parameters.local_data_crh,

10
state/src/local_data_commitment/state_leaf_values.rs
View File

@ -14,7 +14,7 @@
// You should have received a copy of the GNU General Public License
// along with the Leo library. If not, see <https://www.gnu.org/licenses/>.
use crate::{find_input, input_to_integer_string, input_to_u8_vec, StateLeafValuesError};
use crate::{find_input, input_to_bytes, input_to_integer_string, StateLeafValuesError};
use leo_ast::StateLeaf as AstStateLeaf;
use std::convert::TryFrom;
@ -24,6 +24,8 @@ static MEMO_PARAMETER_STRING: &str = "memo";
static NETWORK_ID_PARAMETER_STRING: &str = "network_id";
static LEAF_RANDOMNESS_PARAMETER_STRING: &str = "leaf_randomness";
/// The serialized values included in the state leaf.
/// A new [`StateLeafValues`] type can be constructed from an [`AstStateLeaf`] type.
pub struct StateLeafValues {
pub path: Vec<u8>,
pub memo: Vec<u8>,
@ -39,11 +41,11 @@ impl TryFrom<&AstStateLeaf> for StateLeafValues {
// Lookup path
let path_value = find_input(PATH_PARAMETER_STRING.to_owned(), &parameters)?;
let path = input_to_u8_vec(path_value)?;
let path = input_to_bytes(path_value)?;
// Lookup memo
let memo_value = find_input(MEMO_PARAMETER_STRING.to_owned(), &parameters)?;
let memo = input_to_u8_vec(memo_value)?;
let memo = input_to_bytes(memo_value)?;
// Lookup network id
let network_id_value = find_input(NETWORK_ID_PARAMETER_STRING.to_owned(), &parameters)?;
@ -51,7 +53,7 @@ impl TryFrom<&AstStateLeaf> for StateLeafValues {
// Lookup leaf randomness
let leaf_randomness_value = find_input(LEAF_RANDOMNESS_PARAMETER_STRING.to_owned(), &parameters)?;
let leaf_randomness = input_to_u8_vec(leaf_randomness_value)?;
let leaf_randomness = input_to_bytes(leaf_randomness_value)?;
Ok(Self {
path,

6
state/src/local_data_commitment/state_values.rs
View File

@ -14,7 +14,7 @@
// You should have received a copy of the GNU General Public License
// along with the Leo library. If not, see <https://www.gnu.org/licenses/>.
use crate::{find_input, input_to_integer_string, input_to_u8_vec, StateValuesError};
use crate::{find_input, input_to_bytes, input_to_integer_string, StateValuesError};
use leo_ast::State as AstState;
use std::convert::TryFrom;
@ -22,6 +22,8 @@ use std::convert::TryFrom;
static LEAF_INDEX_PARAMETER_STRING: &str = "leaf_index";
static ROOT_PARAMETER_STRING: &str = "root";
/// The serialized values included in the state.
/// A new [`StateValues`] type can be constructed from an [`AstState`] type.
pub struct StateValues {
pub leaf_index: u32,
pub root: Vec<u8>,
@ -39,7 +41,7 @@ impl TryFrom<&AstState> for StateValues {
// Lookup root
let root_value = find_input(ROOT_PARAMETER_STRING.to_owned(), &parameters)?;
let root = input_to_u8_vec(root_value)?;
let root = input_to_bytes(root_value)?;
Ok(Self { leaf_index, root })
}

16
state/src/record_commitment/dpc_record_values.rs
View File

@ -33,6 +33,8 @@ static SERIAL_NUMBER_NONCE_PARAMETER_STRING: &str = "serial_number_nonce";
static COMMITMENT_PARAMETER_STRING: &str = "commitment";
static COMMITMENT_RANDOMNESS_PARAMETER_STRING: &str = "commitment_randomness";
/// The serialized values included in the dpc record.
/// A new [`DPCRecordValues`] type can be constructed from an [`AstRecord`] type.
pub struct DPCRecordValues {
pub serial_number: Vec<u8>,
pub owner: AccountAddress<Components>,
@ -54,7 +56,7 @@ impl TryFrom<&AstRecord> for DPCRecordValues {
// Lookup serial number
let serial_number_value = find_input(SERIAL_NUMBER_PARAMETER_STRING.to_owned(), &parameters)?;
let serial_number = input_to_u8_vec(serial_number_value)?;
let serial_number = input_to_bytes(serial_number_value)?;
// Lookup record owner
let owner_value = find_input(OWNER_PARAMETER_STRING.to_owned(), &parameters)?;
@ -70,27 +72,27 @@ impl TryFrom<&AstRecord> for DPCRecordValues {
// Lookup record payload
let payload_value = find_input(PAYLOAD_PARAMETER_STRING.to_owned(), &parameters)?;
let payload = input_to_u8_vec(payload_value)?;
let payload = input_to_bytes(payload_value)?;
// Lookup record birth program id
let birth_program_id_value = find_input(BIRTH_PROGRAM_ID_PARAMETER_STRING.to_owned(), &parameters)?;
let birth_program_id = input_to_u8_vec(birth_program_id_value)?;
let birth_program_id = input_to_bytes(birth_program_id_value)?;
// Lookup record death program id
let death_program_id_value = find_input(DEATH_PROGRAM_ID_PARAMETER_STRING.to_owned(), &parameters)?;
let death_program_id = input_to_u8_vec(death_program_id_value)?;
let death_program_id = input_to_bytes(death_program_id_value)?;
// Lookup record serial number nonce
let serial_number_nonce_value = find_input(SERIAL_NUMBER_NONCE_PARAMETER_STRING.to_owned(), &parameters)?;
let serial_number_nonce = input_to_u8_vec(serial_number_nonce_value)?;
let serial_number_nonce = input_to_bytes(serial_number_nonce_value)?;
// Lookup record commitment
let commitment_value = find_input(COMMITMENT_PARAMETER_STRING.to_owned(), &parameters)?;
let commitment = input_to_u8_vec(commitment_value)?;
let commitment = input_to_bytes(commitment_value)?;
// Lookup record commitment randomness
let commitment_randomness_value = find_input(COMMITMENT_RANDOMNESS_PARAMETER_STRING.to_owned(), &parameters)?;
let commitment_randomness = input_to_u8_vec(commitment_randomness_value)?;
let commitment_randomness = input_to_bytes(commitment_randomness_value)?;
Ok(Self {
serial_number,

2
state/src/record_commitment/record_commitment.rs
View File

@ -26,6 +26,8 @@ use snarkos_utilities::{bytes::ToBytes, to_bytes, FromBytes};
use std::convert::TryFrom;
/// Returns a serialized [`DPCRecordValues`] type if the record commitment is valid given the
/// system parameters.
pub fn verify_record_commitment(
system_parameters: &SystemParameters<Components>,
ast_record: &AstRecord,

14
state/src/utilities/input_value.rs
View File

@ -19,6 +19,8 @@ use leo_ast::{InputValue, Parameter};
use std::collections::HashMap;
/// Returns the input parameter with the given name.
/// If a parameter with the given name does not exist, then an error is returned.
pub fn find_input(
name: String,
parameters: &HashMap<Parameter, Option<InputValue>>,
@ -36,6 +38,8 @@ pub fn find_input(
}
}
/// Returns the string of the integer input value.
/// If the input value is not an integer, then an error is returned.
pub fn input_to_integer_string(input: InputValue) -> Result<String, InputValueError> {
match input {
InputValue::Integer(_type, string) => Ok(string),
@ -43,7 +47,9 @@ pub fn input_to_integer_string(input: InputValue) -> Result<String, InputValueEr
}
}
pub fn input_to_u8_vec(input: InputValue) -> Result<Vec<u8>, InputValueError> {
/// Returns the given input value as u8 bytes.
/// If the given input value cannot be serialized into bytes then an error is returned.
pub fn input_to_bytes(input: InputValue) -> Result<Vec<u8>, InputValueError> {
let input_array = match input {
InputValue::Array(values) => values,
value => return Err(InputValueError::ExpectedBytes(value.to_string())),
@ -61,7 +67,9 @@ pub fn input_to_u8_vec(input: InputValue) -> Result<Vec<u8>, InputValueError> {
Ok(result_vec)
}
pub fn input_to_nested_u8_vec(input: InputValue) -> Result<Vec<Vec<u8>>, InputValueError> {
/// Returns the given input value as an array of u8 bytes.
/// If the given input value cannot be serialized into an array of bytes then an error is returned.
pub fn input_to_nested_bytes(input: InputValue) -> Result<Vec<Vec<u8>>, InputValueError> {
let inner_arrays = match input {
InputValue::Array(arrays) => arrays,
value => return Err(InputValueError::ExpectedBytes(value.to_string())),
@ -70,7 +78,7 @@ pub fn input_to_nested_u8_vec(input: InputValue) -> Result<Vec<Vec<u8>>, InputVa
let mut result_vec = Vec::with_capacity(inner_arrays.len());
for input_array in inner_arrays {
let array = input_to_u8_vec(input_array)?;
let array = input_to_bytes(input_array)?;
result_vec.push(array);
}