Added solidity packed functions.

packages/hash/src.ts/index.ts

@@ -1,6 +1,9 @@
 export { id } from "./id.js"
 export { isValidName, namehash, dnsEncode } from "./namehash.js";
 export { messagePrefix, hashMessage } from "./message.js";
+export {
+    solidityPacked, solidityPackedKeccak256, solidityPackedSha256
+} from "./solidity.js";
 export { TypedDataEncoder } from "./typed-data.js";
 
 export type { TypedDataDomain, TypedDataField } from "./typed-data.js";

packages/hash/src.ts/solidity.ts

@@ -0,0 +1,96 @@
+import {
+    concat, dataLength, hexlify, zeroPadBytes, zeroPadValue
+} from "@ethersproject/bytes";
+import { keccak256 as _keccak256, sha256 as _sha256 } from "@ethersproject/crypto";
+import { toTwos } from "@ethersproject/math";
+import { toUtf8Bytes } from "@ethersproject/strings";
+
+import { logger } from "./logger.js";
+
+
+const regexBytes = new RegExp("^bytes([0-9]+)$");
+const regexNumber = new RegExp("^(u?int)([0-9]*)$");
+const regexArray = new RegExp("^(.*)\\[([0-9]*)\\]$");
+
+
+function _pack(type: string, value: any, isArray?: boolean): Uint8Array {
+    switch(type) {
+        case "address":
+            if (isArray) { return logger.getBytes(zeroPadValue(value, 32)); }
+            return logger.getBytes(value);
+        case "string":
+            return toUtf8Bytes(value);
+        case "bytes":
+            return logger.getBytes(value);
+        case "bool":
+            value = (!!value ? "0x01": "0x00");
+            if (isArray) { return logger.getBytes(zeroPadValue(value, 32)); }
+            return logger.getBytes(value);
+    }
+
+    let match =  type.match(regexNumber);
+    if (match) {
+        let size = parseInt(match[2] || "256")
+
+        if ((match[2] && String(size) !== match[2]) || (size % 8 !== 0) || size === 0 || size > 256) {
+            return logger.throwArgumentError("invalid number type", "type", type)
+        }
+
+        if (isArray) { size = 256; }
+
+        value = toTwos(value, size);
+
+        return logger.getBytes(zeroPadValue(value, size / 8));
+    }
+
+    match = type.match(regexBytes);
+    if (match) {
+        const size = parseInt(match[1]);
+
+        if (String(size) !== match[1] || size === 0 || size > 32) {
+            return logger.throwArgumentError("invalid bytes type", "type", type)
+        }
+        if (dataLength(value) !== size) {
+            return logger.throwArgumentError(`invalid value for ${ type }`, "value", value)
+        }
+        if (isArray) { return logger.getBytes(zeroPadBytes(value, 32)); }
+        return value;
+    }
+
+    match = type.match(regexArray);
+    if (match && Array.isArray(value)) {
+        const baseType = match[1];
+        const count = parseInt(match[2] || String(value.length));
+        if (count != value.length) {
+            logger.throwArgumentError(`invalid array length for ${ type }`, "value", value)
+        }
+        const result: Array<Uint8Array> = [];
+        value.forEach(function(value) {
+            result.push(_pack(baseType, value, true));
+        });
+        return logger.getBytes(concat(result));
+    }
+
+    return logger.throwArgumentError("invalid type", "type", type)
+}
+
+// @TODO: Array Enum
+
+export function solidityPacked(types: ReadonlyArray<string>, values: ReadonlyArray<any>) {
+    if (types.length != values.length) {
+        logger.throwArgumentError("wrong number of values; expected ${ types.length }", "values", values)
+    }
+    const tight: Array<Uint8Array> = [];
+    types.forEach(function(type, index) {
+        tight.push(_pack(type, values[index]));
+    });
+    return hexlify(concat(tight));
+}
+
+export function solidityPackedKeccak256(types: ReadonlyArray<string>, values: ReadonlyArray<any>) {
+    return _keccak256(solidityPacked(types, values));
+}
+
+export function solidityPackedSha256(types: ReadonlyArray<string>, values: ReadonlyArray<any>) {
+    return _sha256(solidityPacked(types, values));
+}