<feat>(gateway-contracts): decrypt multiple values in Solidity with list of integers in API

[matteoettam09]

Describe the issue

Any short term plan to start supporting APIs like:

function callbackPreProcessDecrypt(
    uint256 requestID,
    uint128[] calldata decryptedValues,
    bytes[] calldata signatures
) external {

As far as I understand, also looking at the examples, there is no way to pass variable-size lists as cyphertexts and then get the decrypted list back.

In my use case I cannot hardcode separate decrypted variables
The payload is prepared with something like:

for (uint16 i = 0; i < mTokens; ++i) {
    address token = _currentEpoch.tokens[i];
    euint128 position = _currentEpoch.encryptedInitialBatchPortfolio[token];
    FHE.allowThis(position);
    cypherTexts[nVaults + i] = FHE.toBytes32(position);
}
FHE.requestDecryption(cypherTexts, this.callbackPreProcessDecrypt.selector);

And I cannot afford to hardcode

(
    uint256 requestID,
    uint128 value1, uint128 value2, uint128 value3, uint128 value4,
    uint128 value5, uint128 value6, uint128 value7, uint128 value8,
    bytes[] calldata signatures
) external {

If the signature was placed before in the API, I could do something like this (which now is impossible because I would need to manually extract the signature as well):

    /// @inheritdoc IInternalStateOrchestrator
    function callbackPreProcessDecrypt(uint256 requestID, bytes[] memory signatures) external {
        FHE.checkSignatures(requestID, signatures);   

        uint256 offset = 36;

        uint128[] memory values = new uint128[](encryptedValuesLength);
        for (uint16 i = 0; i < encryptedValuesLength; i++) {
            values[i] = uint128(uint256(bytes32(msg.data[offset:offset + 32])));
            console.log("value in the callback", values[i]);
            offset += 32;
        }
}

Context

OrionFinanceAI/protocol@132956a

Steps to Reproduce or Propose

No response