1 files changed, 103 insertions, 0 deletions
diff --git a/comm/third_party/asn1js/src/Integer.ts b/comm/third_party/asn1js/src/Integer.ts
new file mode 100644
index 0000000000..fd3d1d9e70
--- /dev/null
+++ b/comm/third_party/asn1js/src/Integer.ts
@@ -0,0 +1,103 @@
+import * as pvtsutils from "pvtsutils";
+import { BaseBlock, BaseBlockJson, BaseBlockParams } from "./BaseBlock";
+import { LocalIntegerValueBlockParams, LocalIntegerValueBlock, LocalIntegerValueBlockJson } from "./internals/LocalIntegerValueBlock";
+import { assertBigInt } from "./internals/utils";
+import { typeStore } from "./TypeStore";
+import { ViewWriter } from "./ViewWriter";
+
+export interface IntegerParams extends BaseBlockParams, LocalIntegerValueBlockParams { }
+export type IntegerJson = BaseBlockJson<LocalIntegerValueBlockJson>;
+
+export class Integer extends BaseBlock<LocalIntegerValueBlock, LocalIntegerValueBlockJson> {
+
+  static {
+    typeStore.Integer = this;
+  }
+
+  public static override NAME = "INTEGER";
+
+  constructor(parameters: IntegerParams = {}) {
+    super(parameters, LocalIntegerValueBlock);
+
+    this.idBlock.tagClass = 1; // UNIVERSAL
+    this.idBlock.tagNumber = 2; // Integer
+  }
+
+  /**
+   * Converts Integer into BigInt
+   * @throws Throws Error if BigInt is not supported
+   * @since 3.0.0
+   */
+  public toBigInt(): bigint {
+    assertBigInt();
+
+    return BigInt(this.valueBlock.toString());
+  }
+
+  /**
+   * Creates Integer from BigInt value
+   * @param value BigInt value
+   * @returns ASN.1 Integer
+   * @throws Throws Error if BigInt is not supported
+   * @since 3.0.0
+   */
+  public static fromBigInt(value: number | string | bigint | boolean): Integer {
+    assertBigInt();
+
+    const bigIntValue = BigInt(value);
+    const writer = new ViewWriter();
+
+    const hex = bigIntValue.toString(16).replace(/^-/, "");
+    const view = new Uint8Array(pvtsutils.Convert.FromHex(hex));
+
+    if (bigIntValue < 0) {
+      // a negative number
+      const first = new Uint8Array(view.length + (view[0] & 0x80 ? 1 : 0));
+      first[0] |= 0x80;
+
+      const firstInt = BigInt(`0x${pvtsutils.Convert.ToHex(first)}`);
+      const secondInt = firstInt + bigIntValue;
+      const second = pvtsutils.BufferSourceConverter.toUint8Array(pvtsutils.Convert.FromHex(secondInt.toString(16)));
+      second[0] |= 0x80;
+
+      writer.write(second);
+    } else {
+      // a positive number
+      if (view[0] & 0x80) {
+        writer.write(new Uint8Array([0]));
+      }
+      writer.write(view);
+    }
+
+    const res = new Integer({
+      valueHex: writer.final(),
+    });
+
+    return res;
+  }
+
+  public convertToDER(): Integer {
+    const integer = new Integer({ valueHex: this.valueBlock.valueHexView });
+
+    integer.valueBlock.toDER();
+
+    return integer;
+  }
+
+  /**
+   * Convert current Integer value from DER to BER format
+   * @returns
+   */
+  public convertFromDER(): Integer {
+    return new Integer({
+      valueHex: this.valueBlock.valueHexView[0] === 0
+        ? this.valueBlock.valueHexView.subarray(1)
+        : this.valueBlock.valueHexView,
+    });
+  }
+
+  protected override onAsciiEncoding(): string {
+    return `${(this.constructor as typeof Integer).NAME} : ${this.valueBlock.toString()}`;
+  }
+
+}