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docs/reference/contracts/libs/crypto/ECDSA256.md

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+# ECDSA256
+
+## Overview
+
+#### License: MIT
+
+```solidity
+library ECDSA256
+```
+
+Cryptography module
+
+This library provides functionality for ECDSA verification over any 256-bit curve.
+
+For more information, please refer to the OpenZeppelin documentation.
+## Structs info
+
+### Parameters
+
+```solidity
+struct Parameters {
+	uint256 a;
+	uint256 b;
+	uint256 gx;
+	uint256 gy;
+	uint256 p;
+	uint256 n;
+	uint256 lowSmax;
+}
+```
+
+256-bit curve parameters.
+### _JPoint
+
+```solidity
+struct _JPoint {
+	uint256 x;
+	uint256 y;
+	uint256 z;
+}
+```
+
+
+### _Inputs
+
+```solidity
+struct _Inputs {
+	uint256 r;
+	uint256 s;
+	uint256 x;
+	uint256 y;
+}
+```
+
+
+## Functions info
+
+### verify
+
+```solidity
+function verify(
+    ECDSA256.Parameters memory curveParams_,
+    bytes32 hashedMessage_,
+    bytes memory signature_,
+    bytes memory pubKey_
+) internal view returns (bool)
+```
+
+The function to verify the ECDSA signature
+
+
+Parameters:
+
+| Name           | Type                       | Description                                                                                                                                                                                |
+| :------------- | :------------------------- | :----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
+| curveParams_   | struct ECDSA256.Parameters | the 256-bit curve parameters. `lowSmax` is `n / 2`.                                                                                                                                        |
+| hashedMessage_ | bytes32                    | the already hashed message to be verified.                                                                                                                                                 |
+| signature_     | bytes                      | the ECDSA signature. Equals to `bytes(r) + bytes(s)`.                                                                                                                                      |
+| pubKey_        | bytes                      | the full public key of a signer. Equals to `bytes(x) + bytes(y)`.  Note that signatures only from the lower part of the curve are accepted. If your `s > n / 2`, change it to `s = n - s`. |