1 files changed, 150 insertions, 0 deletions
diff --git a/third_party/js/PKI.js/src/RSAPublicKey.ts b/third_party/js/PKI.js/src/RSAPublicKey.ts
new file mode 100644
index 0000000000..088e08684f
--- /dev/null
+++ b/third_party/js/PKI.js/src/RSAPublicKey.ts
@@ -0,0 +1,150 @@
+import * as asn1js from "asn1js";
+import * as pvtsutils from "pvtsutils";
+import * as pvutils from "pvutils";
+import { EMPTY_STRING } from "./constants";
+import { AsnError, ParameterError } from "./errors";
+import { PkiObject, PkiObjectParameters } from "./PkiObject";
+import * as Schema from "./Schema";
+
+export interface IRSAPublicKey {
+  /**
+   * Modulus part of RSA public key
+   */
+  modulus: asn1js.Integer;
+  /**
+   * Public exponent of RSA public key
+   */
+  publicExponent: asn1js.Integer;
+}
+
+export interface RSAPublicKeyJson {
+  n: string;
+  e: string;
+}
+
+export type RSAPublicKeyParameters = PkiObjectParameters & Partial<IRSAPublicKey> & { json?: RSAPublicKeyJson; };
+
+const MODULUS = "modulus";
+const PUBLIC_EXPONENT = "publicExponent";
+const CLEAR_PROPS = [MODULUS, PUBLIC_EXPONENT];
+
+/**
+ * Represents the RSAPublicKey structure described in [RFC3447](https://datatracker.ietf.org/doc/html/rfc3447)
+ */
+export class RSAPublicKey extends PkiObject implements IRSAPublicKey {
+
+  public static override CLASS_NAME = "RSAPublicKey";
+
+  public modulus!: asn1js.Integer;
+  public publicExponent!: asn1js.Integer;
+
+  /**
+   * Initializes a new instance of the {@link RSAPublicKey} class
+   * @param parameters Initialization parameters
+   */
+  constructor(parameters: RSAPublicKeyParameters = {}) {
+    super();
+
+
+    this.modulus = pvutils.getParametersValue(parameters, MODULUS, RSAPublicKey.defaultValues(MODULUS));
+    this.publicExponent = pvutils.getParametersValue(parameters, PUBLIC_EXPONENT, RSAPublicKey.defaultValues(PUBLIC_EXPONENT));
+
+    if (parameters.json) {
+      this.fromJSON(parameters.json);
+    }
+
+    if (parameters.schema) {
+      this.fromSchema(parameters.schema);
+    }
+  }
+
+  /**
+   * Returns default values for all class members
+   * @param memberName String name for a class member
+   * @returns Default value
+   */
+  public static override defaultValues(memberName: typeof MODULUS | typeof PUBLIC_EXPONENT): asn1js.Integer;
+  public static override defaultValues(memberName: string): any {
+    switch (memberName) {
+      case MODULUS:
+        return new asn1js.Integer();
+      case PUBLIC_EXPONENT:
+        return new asn1js.Integer();
+      default:
+        return super.defaultValues(memberName);
+    }
+  }
+
+  /**
+   * @inheritdoc
+   * @asn ASN.1 schema
+   * ```asn
+   * RSAPublicKey ::= Sequence {
+   *    modulus           Integer,  -- n
+   *    publicExponent    Integer   -- e
+   * }
+   *```
+   */
+  public static override schema(parameters: Schema.SchemaParameters<{ modulus?: string; publicExponent?: string; }> = {}): Schema.SchemaType {
+    const names = pvutils.getParametersValue<NonNullable<typeof parameters.names>>(parameters, "names", {});
+
+    return (new asn1js.Sequence({
+      name: (names.blockName || EMPTY_STRING),
+      value: [
+        new asn1js.Integer({ name: (names.modulus || EMPTY_STRING) }),
+        new asn1js.Integer({ name: (names.publicExponent || EMPTY_STRING) })
+      ]
+    }));
+  }
+
+  public fromSchema(schema: asn1js.AsnType): void {
+    // Clear input data first
+    pvutils.clearProps(schema, CLEAR_PROPS);
+
+    // Check the schema is valid
+    const asn1 = asn1js.compareSchema(schema,
+      schema,
+      RSAPublicKey.schema({
+        names: {
+          modulus: MODULUS,
+          publicExponent: PUBLIC_EXPONENT
+        }
+      })
+    );
+    AsnError.assertSchema(asn1, this.className);
+
+    // Get internal properties from parsed schema
+    this.modulus = asn1.result.modulus.convertFromDER(256);
+    this.publicExponent = asn1.result.publicExponent;
+  }
+
+  public toSchema(): asn1js.Sequence {
+    return (new asn1js.Sequence({
+      value: [
+        this.modulus.convertToDER(),
+        this.publicExponent
+      ]
+    }));
+  }
+
+  public toJSON(): RSAPublicKeyJson {
+    return {
+      n: pvtsutils.Convert.ToBase64Url(this.modulus.valueBlock.valueHexView),
+      e: pvtsutils.Convert.ToBase64Url(this.publicExponent.valueBlock.valueHexView),
+    };
+  }
+
+  /**
+   * Converts JSON value into current object
+   * @param json JSON object
+   */
+  fromJSON(json: RSAPublicKeyJson): void {
+    ParameterError.assert("json", json, "n", "e");
+
+    const array = pvutils.stringToArrayBuffer(pvutils.fromBase64(json.n, true));
+    this.modulus = new asn1js.Integer({ valueHex: array.slice(0, Math.pow(2, pvutils.nearestPowerOf2(array.byteLength))) });
+    this.publicExponent = new asn1js.Integer({ valueHex: pvutils.stringToArrayBuffer(pvutils.fromBase64(json.e, true)).slice(0, 3) });
+  }
+
+}
+