feat: 新增共享加密包并引入 ZIP/PGP 依赖

packages/crypto/src/pgp.ts

@@ -0,0 +1,75 @@
+import * as openpgp from 'openpgp'
+
+/**
+ * Generate an OpenPGP RSA key pair.
+ *
+ * @param name - User name for the key
+ * @param email - User email for the key
+ * @returns ASCII-armored private and public keys
+ */
+export const generatePgpKeyPair = async (
+  name: string,
+  email: string,
+): Promise<{ privateKey: string; publicKey: string }> => {
+  const { privateKey, publicKey } = await openpgp.generateKey({
+    type: 'rsa',
+    rsaBits: 2048,
+    userIDs: [{ name, email }],
+    format: 'armored',
+  })
+
+  return { privateKey, publicKey }
+}
+
+/**
+ * Create a detached OpenPGP signature for the given data.
+ *
+ * @param data - Raw data to sign (Buffer or Uint8Array)
+ * @param armoredPrivateKey - ASCII-armored private key
+ * @returns ASCII-armored detached signature (signature.asc content)
+ */
+export const pgpSignDetached = async (data: Uint8Array, armoredPrivateKey: string): Promise<string> => {
+  const privateKey = await openpgp.readPrivateKey({ armoredKey: armoredPrivateKey })
+  const message = await openpgp.createMessage({ binary: data })
+
+  const signature = await openpgp.sign({
+    message,
+    signingKeys: privateKey,
+    detached: true,
+    format: 'armored',
+  })
+
+  return signature as string
+}
+
+/**
+ * Verify a detached OpenPGP signature.
+ *
+ * @param data - Original data (Buffer or Uint8Array)
+ * @param armoredSignature - ASCII-armored detached signature
+ * @param armoredPublicKey - ASCII-armored public key
+ * @returns true if signature is valid
+ */
+export const pgpVerifyDetached = async (
+  data: Uint8Array,
+  armoredSignature: string,
+  armoredPublicKey: string,
+): Promise<boolean> => {
+  const publicKey = await openpgp.readKey({ armoredKey: armoredPublicKey })
+  const signature = await openpgp.readSignature({ armoredSignature })
+  const message = await openpgp.createMessage({ binary: data })
+
+  const verificationResult = await openpgp.verify({
+    message,
+    signature,
+    verificationKeys: publicKey,
+  })
+
+  const { verified } = verificationResult.signatures[0]!
+  try {
+    await verified
+    return true
+  } catch {
+    return false
+  }
+}