diff --git a/apps/mobile/__mocks__/expo-crypto.ts b/apps/mobile/__mocks__/expo-crypto.ts
new file mode 100644
index 0000000..2c724f2
--- /dev/null
+++ b/apps/mobile/__mocks__/expo-crypto.ts
@@ -0,0 +1,5 @@
+export const CryptoDigestAlgorithm = { SHA256: "SHA-256" } as const;
+export const CryptoEncoding = { BASE64: "base64" } as const;
+
+export const getRandomBytes = jest.fn((size: number) => new Uint8Array(size));
+export const digestStringAsync = jest.fn(async () => "mock-digest");