RSASSA-PKCS1-v1_5 Signature and Verification

examples/rsa-signature.ts

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+/**
+ * @title RSASSA-PKCS1-v1_5 Signature and Verification
+ * @difficulty intermediate
+ * @tags cli, web
+ * @run <url>
+ * @group Cryptography
+ *
+ * This example demonstrates RSA signature and verification using Deno's built-in SubtleCrypto API.
+ */
+
+// Convert the text to a Uint8Array using TextEncoder (required for signing)
+const data = new TextEncoder().encode("Hello, Deno 2.0!");
+
+const { publicKey, privateKey } = await crypto.subtle.generateKey(
+  {
+    name: "RSASSA-PKCS1-v1_5",
+    modulusLength: 2048, // 2048-bit key for strong security
+    publicExponent: new Uint8Array([1, 0, 1]), // Public exponent: 65537
+    hash: { name: "SHA-256" },
+  },
+  true,
+  ["verify", "sign"],
+);
+
+// Sign the data using the private key
+const signature = await crypto.subtle.sign(
+  { name: "RSASSA-PKCS1-v1_5" },
+  privateKey,
+  data,
+);
+
+// Log the signature as a byte array
+console.log("Signature:", new Uint8Array(signature));
+
+// Verify the signature using the public key
+const verification = await crypto.subtle.verify(
+  { name: "RSASSA-PKCS1-v1_5" },
+  publicKey,
+  signature,
+  data,
+);
+
+console.log("Verification:", verification);