lib.nr

// Ethereum trie proof implementation
use dep::std::hash::keccak256;

mod rlp; // Module for required RLP encoding/decoding

// 2-node enum
global EXTENSION: Field = 0;
global LEAF: Field = 1;

// Constants for 32-byte long keys; TODO: Omit these when it is possible to replace constants with numeric generics.
global KEY_LENGTH: Field = 32; // key length in bytes; <= 55 for simplicity
global NIBBLE_LENGTH: Field = 64; // = 2*KEY_LENGTH

// For tries with 32-byte long keys, we we can bound the byte length of any node from above by the following constant:
global MAX_TRIE_NODE_LENGTH: Field = 532; // = MAX_RLP_LIST_HEADER_LENGTH (= 1 + MAX_LENGTH_BYTES)
//   + 16*MAX_RLP_ELEMENT_LENGTH (= 16*(1 + KEY_LENGTH))
// + LENGTH_OF_NULL_ELEMENT (= 1)

global MAX_ACCOUNT_STATE_LENGTH: Field = 134;

global MAX_NUM_FIELDS: Field = 17;

/// Type for storage proofs corresponding to `ethers-rs` StorageProof type
/// Involves 32-byte keys
// TODO: Add comptime Field parameters to
// - bound the sizes of the nodes embedded in `proof` to allow arbitrary fixed-length keys
// - bound the key length to allow variable-length keys
// These would require the ability to declare arrays of length expressed as a comptime Field variable.
struct TrieProof<KEY_LEN, PROOF_LEN, VALUE_LEN> // VALUE_LEN should be smaller than 56 bytes.
{
    /// Unhashed key to look up along proof path
    key: [u8; KEY_LEN],
    /// RLP encoded proof path; assumed to be obtained by appropriately right-padding each node (e.g. with zeros) and concatenating in order. The size of each node will depend on the application, e.g. MAX_TRIE_NODE_LENGTH for storage proofs.
    proof: [u8; PROOF_LEN],
    /// Depth of proof. Necessary for technical reasons.
    depth: Field,
    /// The value the given proof path should terminate with.
    value: [u8; VALUE_LEN]
}

impl<PROOF_LEN, VALUE_LEN> TrieProof<32, PROOF_LEN, VALUE_LEN>
{
    /// Ethereum storage proof verifier. Returns true if all constraints are satisfied.
    ///
    /// # Arguments
    /// * `self` - The proof to be verified.
    /// * `trie_root` - The root of the trie as a hash
    ///
    /// # Quirks
    /// * `PROOF_LEN`, the length of the byte array representing the proof path, *must* be a multiple of MAX_TRIE_NODE_LENGTH.
    fn verify_storage_root(
        self,
        trie_root: [u8; KEY_LENGTH],
    ) -> bool
    {
        assert((PROOF_LEN as u32) % (MAX_TRIE_NODE_LENGTH as u32) == 0); // Check that N is a multiple of MAX_TRIE_NODE_LENGTH

        let key = keccak256(self.key, 32); // The path is traced out by the hashed key
        
        let key_nibbles: [u4; NIBBLE_LENGTH] = key_as_nibbles(key);
        
        let mut key_ptr = 0;

        let (value, mut value_length) = byte_value(self.value); // Value to verify together with its byte length

        let path = self.proof; // Proof path

        let depth = self.depth; // Depth of proof path

        let mut extracted_hash = trie_root;

        let mut node = [0; MAX_TRIE_NODE_LENGTH];

        for i in 0..(path.len()/MAX_TRIE_NODE_LENGTH - 1)
        {
            let range_p = (i as u8) < (depth - 1) as u8; // Range predicate
            
            let k = if (range_p) {i} else {0}; // Restrict index to range {0, ..., depth - 2}

            // Populate node array
	        for j in 0..MAX_TRIE_NODE_LENGTH
	        {
		        node[j] = path[j + k*MAX_TRIE_NODE_LENGTH];
	        }

            assert(!range_p | verify_node_hash(node, extracted_hash)); // If within range, node hash should match the hash extracted from the preceding node.
            
            // Extract hash and advance key pointer if within range
            if range_p
            {
                let lookup: ([u8; 32], Field) = resolve_nibble32(key_nibbles, key_ptr, node); // Resolve next nibble(s)
                extracted_hash = lookup.0;
                key_ptr = lookup.1;
            }
        }
        
        // Treat final node as the preceding nodes...
        for j in 0..MAX_TRIE_NODE_LENGTH
	    {
		    node[j] = path[j + (depth - 1)*MAX_TRIE_NODE_LENGTH];
	    }

        assert(verify_node_hash(node, extracted_hash));

        let rlp_list: rlp::RLP_List<MAX_NUM_FIELDS> = rlp::decode1_small_lis(node); // Both slots contain less than 56 bytes.
        
        // ...except extract a value rather than a key.
 	    let (mut extracted_value, extracted_value_length, terminal_key_ptr): ([u8; 33], Field, Field) = resolve2(LEAF, node, rlp_list, key_nibbles, key_ptr);

        assert((extracted_value_length as u32) <= 33); // Extracted value be at most 33 bytes with RLP header
 	    key_ptr = terminal_key_ptr;

        assert(key_ptr == 2*key.len()); // All of the key has been exhausted.

        // Decode extracted value
        let (dec_value_offset, dec_value_len) = rlp::decode0(extracted_value);
        assert(dec_value_len == value_length);
        
        for i in 0..VALUE_LEN
        {
            if (i as u32) < (value_length as u32)
            {
                assert(extracted_value[dec_value_offset + i] == value[i]);
            }
        }
        
        true
    }
}

impl<PROOF_LEN, VALUE_LEN> TrieProof<20, PROOF_LEN, VALUE_LEN>
{
    /// Ethereum state proof verifier. Returns true if all constraints are satisfied.
    ///
    /// # Arguments
    /// * `self` - The proof to be verified.
    /// * `trie_root` - The root of the trie
    fn verify_state_root( // PROOF_LEN *must* be a multiple of MAX_TRIE_NODE_LENGTH!
        self,
        trie_root: [u8; KEY_LENGTH], // Hash of root, i.e. first, node.
    ) -> bool
    {
        assert((PROOF_LEN as u32) % (MAX_TRIE_NODE_LENGTH as u32) == 0); // Check that N is a multiple of MAX_TRIE_NODE_LENGTH

        let key = keccak256(self.key, 20); // The path is traced out by the hashed key
        
        let key_nibbles: [u4; NIBBLE_LENGTH] = key_as_nibbles(key);
        
        let mut key_ptr = 0;

        let (value, mut value_length) = byte_value(self.value); // Value to verify together with its byte length

        let path = self.proof; // Proof path

        let depth = self.depth; // Depth of proof path

        let mut extracted_hash = trie_root;

        let mut node = [0; MAX_TRIE_NODE_LENGTH];

        for i in 0..(path.len()/MAX_TRIE_NODE_LENGTH - 1)
        {
            let range_p = (i as u8) < (depth - 1) as u8; // Range predicate
            
            let k = if (range_p) {i} else {0}; // Restrict index to range {0, ..., depth - 2}

            // Populate node array
	        for j in 0..MAX_TRIE_NODE_LENGTH
	        {
		        node[j] = path[j + k*MAX_TRIE_NODE_LENGTH];
	        }

            assert(!range_p | verify_node_hash(node, extracted_hash)); // If within range, node hash should match the hash extracted from the preceding node.
            
            // Extract hash and advance key pointer if within range
            if range_p
            {
                let lookup: ([u8; 32], Field) = resolve_nibble32(key_nibbles, key_ptr, node); // Resolve next nibble(s)
                extracted_hash = lookup.0;
                key_ptr = lookup.1;
            }
        }
        
        // Treat final node as the preceding nodes...
        for j in 0..MAX_TRIE_NODE_LENGTH
	    {
		    node[j] = path[j + (depth - 1)*MAX_TRIE_NODE_LENGTH];
	    }

        assert(verify_node_hash(node, extracted_hash));

        let rlp_list: rlp::RLP_List<MAX_NUM_FIELDS> = rlp::decode1(node);
        
        // ...except extract a value rather than a key.
 	    let (mut extracted_value, extracted_value_length, terminal_key_ptr): ([u8; MAX_ACCOUNT_STATE_LENGTH], Field, Field) = resolve2(LEAF, node, rlp_list, key_nibbles, key_ptr);

        assert((extracted_value_length as u32) <= (VALUE_LEN as u32)); // Extracted value should fit in a byte array of length MAX_ACCOUNT_STATE_LENGTH.
 	    key_ptr = terminal_key_ptr;

        assert(key_ptr == 2*key.len()); // All of the key has been exhausted.

        // No need to decode data, but it ought to be a list.
        assert(extracted_value[0] >= 0xc0);

        assert(extracted_value_length == value_length);
        for i in 0..VALUE_LEN
        {
            if (i as u32) < (value_length as u32)
            {
                assert(extracted_value[i] == value[i]);
            }
        }
        
        true
    }
}

/// Trie node hash verifier. Returns true if the node has the specified keccak256 hash.
///
/// # Arguments
/// * `node` - RLP-encoded trie node
/// * `hash` - 32-byte hash value
fn verify_node_hash<N>(node: [u8; N], hash: [u8; 32])
                       -> bool
{
    // Extract actual length of node
    let node_length = { let rlp_header = rlp::decode_len(node); rlp_header.offset + rlp_header.length }; // Determine length of node

    // Extra safety
    let range_p = ((node_length as u32) > (node.len() as u32)) as Field;
    let safe_length = range_p*node.len() + (1-range_p)*node_length;
        
    // Compute Keccak256 hash of node
	let node_hash = keccak256(node, safe_length as u32);

    // Compare hashes
	node_hash == hash
}


/// Key-to-nibble converter. Returns an array (twice the length of the input array)
/// of 4-bit elements representing the nibbles of the input array.
///
/// # Arguments
/// * `key` - Array of bytes representing a key
fn key_as_nibbles<KEY_LEN, NIB_LEN>(key: [u8; KEY_LEN]) -> [u4; NIB_LEN]
{
    assert(NIB_LEN == 2*KEY_LEN);
    
    let mut nibkey = [0; NIB_LEN];
    
    for i in 0..KEY_LEN
    {
	    nibkey[2*i + 1] = (key[i] & 0x0f) as u4;
	    nibkey[2*i] = ((key[i] - nibkey[2*i + 1] as u8) >> 4) as u4;
    }
    
    nibkey
}

/// Leaf/extension node nibble decoder. Returns the nibbles in the first field
/// in a right-padded array together with the number of nibbles.
///
/// # Arguments
/// * `input`: The first field of a leaf/extension node as a (right-padded) byte array
/// * `length`: The actual length of the data in `input`
fn compact_decode<MAX_ENC_LEN, NIB_LEN>(input: [u8; MAX_ENC_LEN], length: Field) -> ([u4; NIB_LEN], Field)
{

    assert((2 as u32)*(MAX_ENC_LEN as u32) <= ((NIB_LEN + 2) as u32)); // MAX_ENC_LEN should be NIB_LEN/2 or NIB_LEN/2 + 1. TODO
    
    let mut nibble = [0 as u4; NIB_LEN];
    let mut out_length = 0;

	let mut prev_nibbles = ((input[0] >> 4) as u4, (input[0] & 0x0f) as u4);
    let mut cur_nibbles = (0,0);
    
    let first_nibble = prev_nibbles.0;
	let parity = first_nibble as u1;

    // Consistency checks
    // The first nibble should always be less than 4.
    assert(first_nibble < 4);
    // Parity consistency: If we are dealing with an even number of nibbles, then the second nibble should be 0.
    assert(((1-parity) as u4)*prev_nibbles.1 == 0);

    for i in 0..(MAX_ENC_LEN - 1)
    {
        let x = input[i + 1];
        cur_nibbles = ((x >> 4) as u4, (x & 0x0f) as u4); // x decomposed into two nibbles

        nibble[2*i] = (parity as u4)*prev_nibbles.1 + (1 - (parity as u4))*cur_nibbles.0;
        nibble[2*i + 1] = (parity as u4)*cur_nibbles.0 + (1 - (parity as u4))*cur_nibbles.1;

        prev_nibbles = cur_nibbles;
    }

	out_length = 2*length + (parity as Field) - 2;


    assert((out_length as u32) <= (NIB_LEN as u32)); // Sanity check
    let out = (nibble, out_length);
    out
}

/// Non-terminal nibble resolver (assuming 32-byte fixed key length).
/// Returns the extracted hash together with an advanced key pointer.
///
/// # Arguments
/// * `key` - Array containing the nibbles to be resolved
/// * `key_ptr` - Pointer to the nibbles in `key` to be resolved
/// * `node` - RLP-encoded byte array of branch or extension node
fn resolve_nibble32<N>(
    key: [u4; NIBBLE_LENGTH],
    mut key_ptr: Field,
    node: [u8; N]) ->
    ([u8; 32], // Extracted hash
    Field) // New key pointer
{
    let rlp_list: rlp::RLP_List<MAX_NUM_FIELDS> = rlp::decode1_small_lis(node); // Assumes no intermediate nodes have slots with >= 56 bytes, which is the case for state and storage proofs.
    let num_fields = rlp_list.num_fields;

    let mut resolved_key = [0; 32];
    let mut resolved_key_length = 0;
    
    if num_fields == 2 // If we are dealing with an extension node
    {
        // Resolve 2-node
        let node_resolution: ([u8; 32], Field, Field) = resolve2(EXTENSION, node, rlp_list, key, key_ptr);
        // Deconstruct
        key_ptr = node_resolution.2;
        resolved_key = node_resolution.0;
        resolved_key_length = node_resolution.1;        
    }
    else
    {
        // Since we are dealing with a fixed key length, the last slot must be empty.
        assert(rlp_list.length[16] == 0);

        // Resolve 17-node
        let node_resolution = resolve17(node, rlp_list, key, key_ptr);

        key_ptr = node_resolution.2;
        resolved_key = node_resolution.0;
        resolved_key_length = node_resolution.1;
	}

    assert(resolved_key_length == 32);
    
    (resolved_key, key_ptr)
}

/// Branch (i.e. 17-node) resolver. Assumes 32-byte fixed key length (i.e. slot 17 should be empty).
/// Returns the extracted hash, its length and the advanced key pointer.
///
/// # Arguments
/// * `node` - RLP-encoded branch node
/// * `rlp_list` - RLP list look-up table for `node`
/// * `key` - Array containing the nibbles to be resolved
/// * `key_ptr` - Pointer to the nibbles in `key` to be resolved
// TODO: Generalise to accommodate for variable key lengths.
fn resolve17<N>(
    node: [u8; N],
    rlp_list: rlp::RLP_List<MAX_NUM_FIELDS>,
    key: [u4; NIBBLE_LENGTH],
    mut key_ptr: Field)
                      -> (
    [u8; KEY_LENGTH], // Extracted hash
    Field, // Extracted key length
    Field) // New key pointer
{
    // We should be dealing with a node containing 17 elements
    assert(rlp_list.num_fields == 17);
    
    // The first 16 slots should be of length 32 or 0.
    for i in 0..16
    {
        assert(rlp_list.length[i]*(rlp_list.length[i] - KEY_LENGTH) == 0);
    }

    // And the last slot should be empty
    assert(rlp_list.length[16] == 0);
    
    let cur_nibble = key[key_ptr];
	let resolved_key_length = rlp_list.length[cur_nibble as Field];

    assert(resolved_key_length == KEY_LENGTH);
    assert((key_ptr as u32) < (NIBBLE_LENGTH as u32)); // Fixed-length key => Node cannot be terminal.
    
    key_ptr += 1;

	let nibble_offset = rlp_list.offset[cur_nibble as Field];

    let mut resolved_key = [0; KEY_LENGTH];
    
    for j in 0..KEY_LENGTH
	{
		resolved_key[j] = node[nibble_offset + j];
	}


    let out = (resolved_key, resolved_key_length, key_ptr);

    out
}

// Resolve a 2-node, i.e. a LEAF or EXTENSION.
/// Leaf/extension (i.e. 2-node) resolver.
/// Returns the extracted value, its length and the advanced key pointer.
///
/// # Arguments
/// * `node_type` - Node type, i.e. LEAF or EXTENSION
/// * `node` - RLP-encoded leaf/extension node
/// * `rlp_list` - RLP list look-up table for `node`
/// * `key` - Array containing the nibbles to be resolved
/// * `key_ptr` - Pointer to the nibbles in `key` to be resolved
fn resolve2<N, VALUE_LEN>(
    node_type: Field,
    node: [u8; N],
    rlp_list: rlp::RLP_List<MAX_NUM_FIELDS>,
    key: [u4; NIBBLE_LENGTH],
    mut key_ptr: Field)
                      -> (
    [u8; VALUE_LEN], // Extracted value
    Field, // Value length
    Field) // New key offset
{
    // We should be dealing with a node containing two elements
    assert(rlp_list.num_fields == 2);
    
    let mut value = [0; VALUE_LEN];
    
    let first_slot: [u8; 1 + NIBBLE_LENGTH/2] = rlp::take_dot_drop(node,rlp_list.offset[0]); // TODO: Replace consts with numeric generics when it is possible to use them in array length expressions
    
	let (nib, niblen): ([u4; NIBBLE_LENGTH], Field) = compact_decode(first_slot, rlp_list.length[0]);

    // Length checks.
    // Should not go past 64 nibbles.
	assert(((NIBBLE_LENGTH - key_ptr) as u32) >= niblen as u32);

    // Check that the `niblen` nibbles in the first slot match up with the `niblen` nibbles
    // in `key` starting from offset `key_ptr`.
    for i in 0..NIBBLE_LENGTH
    {
        if (i as u32) < (niblen as u32)
        {
            assert(nib[i] == key[key_ptr + i]);
        }
    }

    // Store length of value obtained
	let value_length = rlp_list.length[1];
    // This should not exceed VALUE_LEN
    assert((value_length as u32) <= (VALUE_LEN as u32));
   
    // Increment offset
    key_ptr += niblen;

	// Store value
    assert(((rlp_list.offset[1] + VALUE_LEN) as u32) <= (N as u32)); // VALUE_LEN should be consistent with maximum node length
	for i in 0..VALUE_LEN
	{
		value[i] = node[rlp_list.offset[1] + i];
	}

    // Ensure we've followed the right kind of node, i.e. if we're not at the end of the key,
    // we should have followed an extension node, and if we are, then we should have followed a leaf node.
    let node_type_nibble = (first_slot[0] >> 4);

    assert(if node_type == LEAF { (node_type_nibble as u4) > 1 } else { (node_type == EXTENSION) & ((node_type_nibble as u4) <= 1) }); // Must have resolved a leaf or extension node.
    
    (value, value_length, key_ptr)
}


/// Function for expressing a big-endian byte array as a right-padded one.
/// Returns a right-padded byte array together with the actual byte length of the number.
///
/// # Arguments
/// * `in_value` - Byte array representing a number in big-endian form.
fn byte_value<N>(in_value: [u8; N]) -> ([u8; N], Field)
{
    let mut value_length = 0;

    for i in 0..N
    {
        let num_bytes_p = (value_length == 0) as Field;
        let byte_p = (in_value[i] != 0) as Field;
        value_length = num_bytes_p*byte_p*(N - i) + (1-num_bytes_p)*value_length;
    }

    let value = left_byte_shift(in_value, N - value_length);

    (value, value_length)
}

/// Left-shift for byte arrays
/// Returns an appropriately shifted byte array.
///
/// # Arguments
/// * `input` - Byte array
/// * `n` - Amount to left-shift elements by
///
/// # Quirks
/// The empty slots are set to 0.
fn left_byte_shift<N>(input: [u8; N], n: Field) -> [u8; N]
{
    let mut out = [0; N];

    for i in 0..N
    {
        // Restrict indices to be shifted, i.e. ∀i: i+n < N, out[i] ← input[i+n].
        let index_p = (((i+n) as u32) < (N as u32)) as Field;
        out[i] = (index_p as u8)*input[index_p*(i+n)];
    }

    out
}

#[test]
fn byte_value_test()
{
    let test0 = byte_value([0,0,0,1,2,3]);
    assert((test0.0 == [1,2,3,0,0,0]) & (test0.1 == 3));

    let test1 = byte_value([1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,0,0,0]);
    assert((test1.0 == [1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,0,0,0]) & (test1.1 == 32));

    let test2 = byte_value([0,0,0,0,0,0,0,0,0,0,11,12,13,14,15,16,17,18,19,20,0,0,0,0,0,0,0,0,0,0,0,0]);
    assert((test2.0 == [11,12,13,14,15,16,17,18,19,20,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0]) & (test2.1 == 22));
}

// Trie proof tests
#[test]
fn cryptopunk1_state()
{
    // Obtain state root using
    // curl -X POST https://rpc.ankr.com/eth -d '{"jsonrpc":"2.0","method":"eth_getBlockByNumber","params":["latest", false],"id":1}'
    // ...and fetch account proof using
    // curl -X POST https://rpc.ankr.com/eth -d '{"jsonrpc":"2.0","method":"eth_getProof","params":["0xb47e3cd837dDF8e4c57f05d70ab865de6e193bbb",["0xbbc70db1b6c7afd11e79c0fb0051300458f1a3acb8ee9789d9b6b26c61ad9bc7"],"latest"],"id":1}'
    let path = 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32,14,125,204,229,47,225,14,101,15,111,160,2,148,192,151,232,233,140,133,199,166,1,248,65,44,197,198,97,221,55,57,35,180,182,172,78,90,126,5,168,100,107,246,160,15,147,81,67,234,238,219,73,83,26,242,7,46,146,127,60,91,130,95,56,121,173,45,6,83,171,146,210,5,103,48,18,160,58,206,231,64,221,55,121,192,72,176,160,234,173,33,210,121,175,129,71,158,172,35,85,188,53,8,107,252,187,41,78,64,160,226,166,86,21,64,29,149,83,235,139,79,66,9,82,196,18,50,91,161,245,2,102,207,105,70,2,211,96,99,194,172,180,160,93,11,236,214,2,112,13,10,228,142,16,244,169,126,29,153,55,60,25,180,86,44,150,230,211,210,155,45,3,83,143,219,160,161,245,213,13,84,188,201,181,231,185,33,94,220,35,155,196,221,1,236,114,1,208,188,161,230,61,72,91,176,159,77,220,160,119,140,117,124,1,37,152,69,34,232,11,142,171,0,13,198,4,216,104,102,6,82,135,134,37,75,22,251,162,223,139,50,160,82,214,243,155,213,117,93,4,215,28,97,215,178,114,184,127,245,188,220,183,221,178,85,30,235,245,80,209,53,106,219,108,160,117,73,250,20,108,233,125,57,166,40,69,227,149,216,244,88,64,206,161,183,249,72,222,239,37,171,86,224,37,112,156,216,160,196,28,140,174,232,227,217,179,9,87,184,195,67,44,121,241,236,19,125,128,123,91,79,199,10,90,108,82,32,247,70,66,160,93,123,139,216,185,254,68,47,38,206,125,228,31,103,114,214,251,87,38,86,17,17,247,28,22,161,106,20,228,181,178,17,160,197,131,246,182,35,231,187,170,229,129,201,77,197,99,223,138,63,105,90,254,77,21,226,98,198,63,6,204,168,90,144,151,128,249,1,17,128,128,160,181,97,232,88,66,17,18,35,3,143,215,239,40,90,191,138,243,72,211,244,159,219,42,74,106,25,118,240,160,119,80,105,160,234,98,171,93,187,172,62,5,38,128,89,224,209,164,129,90,20,61,240,191,15,26,183,186,83,42,58,37,66,11,254,15,160,96,225,198,195,140,205,201,110,250,239,125,190,22,27,158,97,43,64,19,1,78,92,198,96,160,180,205,34,64,36,224,31,128,128,160,148,190,54,26,158,232,77,165,166,153,183,126,156,153,157,222,72,80,163,26,13,208,25,19,10,57,6,19,72,28,54,228,160,107,158,152,156,242,159,119,188,69,88,76,138,214,139,31,148,197,67,186,238,138,27,15,17,15,82,134,130,129,123,13,149,128,160,242,136,37,46,84,217,167,241,4,107,217,154,69,129,166,248,161,219,17,56,33,59,210,115,73,4,118,88,77,107,19,227,160,127,99,186,184,188,30,186,217,4,229,71,62,203,180,184,121,75,158,34,163,30,82,176,243,129,182,216,144,24,196,66,33,160,62,113,155,138,140,159,169,35,227,191,166,57,200,50,150,114,86,163,83,46,242,62,74,48,114,4,81,12,168,194,207,241,128,128,128,128,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,248,112,157,63,140,127,171,87,71,26,42,65,56,127,155,13,14,171,34,148,87,197,2,75,214,207,183,45,215,187,162,254,184,80,248,78,1,138,1,9,138,94,49,250,197,178,237,53,160,59,53,98,31,248,199,239,241,97,151,191,214,41,112,208,186,6,39,251,176,77,96,206,86,100,69,139,103,53,252,45,68,160,226,231,167,82,74,152,206,98,158,228,6,193,92,81,166,131,228,22,127,11,116,234,35,5,102,221,236,231,174,157,111,11,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0];
    let depth = 8;
    let key = [0xb4,0x7e,0x3c,0xd8,0x37,0xdD,0xF8,0xe4,0xc5,0x7f,0x05,0xd7,0x0a,0xb8,0x65,0xde,0x6e,0x19,0x3b,0xbb];
    let value = [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,248,78,1,138,1,9,138,94,49,250,197,178,237,53,160,59,53,98,31,248,199,239,241,97,151,191,214,41,112,208,186,6,39,251,176,77,96,206,86,100,69,139,103,53,252,45,68,160,226,231,167,82,74,152,206,98,158,228,6,193,92,81,166,131,228,22,127,11,116,234,35,5,102,221,236,231,174,157,111,11];
    let state_root = [112,56,122,133,23,47,73,128,191,60,87,177,86,13,219,71,223,227,99,198,112,59,153,131,186,191,11,171,14,118,189,34];

    let trie_proof = TrieProof
    {
        key,
        proof: path,
        depth,
        value
    };
    assert(trie_proof.verify_state_root(state_root));
}

#[test]
fn cryptopunk1() // Who owns the first cryptopunk? cf. https://www.youtube.com/watch?v=2-yYtEJdrFY&t=266s
{
    // Block 14194126
    // Address: 0xb47e3cd837dDF8e4c57f05d70ab865de6e193bbb
    // Value: 0xb88f61e6fbda83fbfffabe364112137480398018
    // Key: 0xbbc70db1b6c7afd11e79c0fb0051300458f1a3acb8ee9789d9b6b26c61ad9bc7
    // Fetch proof using e.g.
    // curl -X POST https://rpc.ankr.com/eth -d '{"jsonrpc":"2.0","method":"eth_getProof","params":["0xb47e3cd837dDF8e4c57f05d70ab865de6e193bbb",["0xbbc70db1b6c7afd11e79c0fb0051300458f1a3acb8ee9789d9b6b26c61ad9bc7"],"latest"],"id":1}'

    let path = 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    let depth = 5; // Actual depth

    let storage_root = [0x91,0x1b,0xb4,0x34,0xb8,0x45,0x6f,0x99,0x79,0xf4,0x2a,0x4e,0x3b,0x0c,0x4d,0x00,0x25,0xee,0x93,0xc3,0xb1,0x2a,0xb7,0x97,0x41,0xf7,0x08,0x17,0x02,0x2d,0x08,0x0e];
    let trie_proof = TrieProof
    {
        key: [0xbb,0xc7,0x0d,0xb1,0xb6,0xc7,0xaf,0xd1,0x1e,0x79,0xc0,0xfb,0x00,0x51,0x30,0x04,0x58,0xf1,0xa3,0xac,0xb8,0xee,0x97,0x89,0xd9,0xb6,0xb2,0x6c,0x61,0xad,0x9b,0xc7],
        proof: path,
        depth: depth,
        value: [0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xb8,0x8f,0x61,0xe6,0xfb,0xda,0x83,0xfb,0xff,0xfa,0xbe,0x36,0x41,0x12,0x13,0x74,0x80,0x39,0x80,0x18]
    };
    assert(trie_proof.verify_storage_root(storage_root));

}

#[test]
fn yet_another_storage_proof()
{
let depth = 2;
let key = [ 0xae, 0x3d, 0xeb, 0x1f, 0x6c, 0x58, 0x0f, 0xaf, 0xae, 0x5e, 0x24, 0x11, 0x55, 0x22, 0x33, 0xab, 0x2b, 0x4f, 0xc7, 0xac, 0xbc, 0x1b, 0xe2, 0x45, 0xe5, 0x42, 0xcc, 0x5f, 0xa7, 0x28, 0xf3, 0x8c];
let proof = [ 0xf8, 0x71, 0x80, 0x80, 0x80, 0xa0, 0x48, 0x7c, 0x5d, 0x16, 0xde, 0x6a, 0x8f, 0xf5, 0xec, 0x5b, 0x99, 0x16, 0xcc, 0x19, 0xb7, 0xaa, 0x13, 0x1a, 0x02, 0xd4, 0x52, 0x52, 0x64, 0xb8, 0x06, 0x40, 0x4d, 0xc4, 0x2c, 0x4c, 0xfb, 0x9f, 0x80, 0xa0, 0x52, 0x62, 0x72, 0x97, 0x4c, 0xaa, 0xf4, 0x99, 0xcb, 0x0b, 0xb7, 0x1f, 0xde, 0xa8, 0x6e, 0xe6, 0xcd, 0xdc, 0x94, 0x43, 0xda, 0xbb, 0x7e, 0xcf, 0x35, 0x8b, 0x6b, 0x8c, 0x1c, 0x63, 0x6d, 0xd0, 0x80, 0x80, 0x80, 0x80, 0x80, 0xa0, 0x44, 0x3d, 0xa8, 0x55, 0xb8, 0x89, 0x63, 0x95, 0x54, 0x6d, 0xb0, 0x12, 0x4d, 0xe3, 0x48, 0x87, 0xab, 0x9f, 0xca, 0x90, 0x51, 0x0e, 0x19, 0x54, 0xfa, 0xa0, 0x6c, 0xfd, 0xba, 0x86, 0xfd, 0x22, 0x80, 0x80, 0x80, 0x80, 0x80, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 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    let value = [0x21, 0x99, 0x71, 0xf9, 0x4a, 0x97, 0x42, 0x25, 0x30, 0xb3, 0xb2, 0x59, 0xef, 0x35, 0x4d, 0x1f, 0x9b, 0x0d, 0x22, 0x3b, 0x31, 0x6c, 0x38, 0x7e, 0x02, 0x86, 0x1b, 0x61, 0xf4, 0xc6, 0x58, 0x88];

    let storage_root =   [0x4e,0x78,0x36,0xf4,0xf1,0x32,0xcc,0xaf,0xf9,0xbf,0x6f,0x3c,0x82,0xce,0x48,0xc9,0xdc,0x0f,0x24,0x3f,0x41,0x30,0xdd,0xb9,0xf5,0x97,0x2b,0x95,0xcc,0xc2,0xca,0x97]; 
    let trie_proof = TrieProof
    {
        key,
        proof,
        depth,
        value
    };
    assert(trie_proof.verify_storage_root(storage_root));


}

#[test]
fn nibble_check()
{
    assert(key_as_nibbles([0x56,0xe8,0x1f,0x17,0x1b,0xcc,0x55,0xa6,0xff,0x83,0x45,0xe6,0x92,0xc0,0xf8,0x6e,0x5b,0x48,0xe0,0x1b,0x99,0x6c,0xad,0xc0,0x01,0x62,0x2f,0xb5,0xe3,0x63,0xb4,0x21]) == [0x05,0x06,0x0e,0x08,0x01,0x0f,0x01,0x07,0x01,0x0b,0x0c,0x0c,0x05,0x05,0x0a,0x06,0x0f,0x0f,0x08,0x03,0x04,0x05,0x0e,0x06,0x09,0x02,0x0c,0x00,0x0f,0x08,0x06,0x0e,0x05,0x0b,0x04,0x08,0x0e,0x00,0x01,0x0b,0x09,0x09,0x06,0x0c,0x0a,0x0d,0x0c,0x00,0x00,0x01,0x06,0x02,0x02,0x0f,0x0b,0x05,0x0e,0x03,0x06,0x03,0x0b,0x04,0x02,0x01]);
}

#[test]
fn compact_decode_test()
{
    let (nibble0, len0): ([u4; NIBBLE_LENGTH], Field) = compact_decode([0x11, 0x23, 0x45,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0], 3);
    assert(len0 == 5);
    assert([nibble0[0], nibble0[1], nibble0[2], nibble0[3], nibble0[4]] == [1,2,3,4,5]);

    let (nibble1, len1): ([u4; NIBBLE_LENGTH], Field) = compact_decode([0x20, 0x0f, 0x1c, 0xb8, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0], 4);
    assert(len1 == 6);
    assert([nibble1[0], nibble1[1], nibble1[2], nibble1[3], nibble1[4], nibble1[5]] == [0,15,1,12,11,8]);

    let (nibble2, len2): ([u4; NIBBLE_LENGTH], Field) = compact_decode([0x3f, 0x1c, 0xb8, 0x99, 0xab, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0], 3);
    assert(len2 == 5);
    assert([nibble2[0], nibble2[1], nibble2[2], nibble2[3], nibble2[4]] == [15,1,12,11,8]);
    
}