feat: Expose cross-env cipher utils from utils package

[mondoreale]

This pull request adds support for AES encryption and decryption utilities for both browser and Node.js environments, updates the build configuration to bundle necessary dependencies, and ensures that new cryptographic functions are exported for use throughout the codebase.

Changes

Cryptography utilities:

• Added createCipheriv and createDecipheriv functions to browser/crypto.ts using browserify-aes for AES support in the browser, with input validation for supported suites.

• Added corresponding createCipheriv and createDecipheriv functions to nodejs/crypto.ts using Node's native crypto module for Node.js support.

• Exported the new cryptographic functions from exports.ts for use in other modules.

Dependency management:

• Added browserify-aes and md5.js to dependencies, and @rollup/plugin-commonjs and @rollup/plugin-json to devDependencies in package.json to support new crypto utilities and bundling. [1] [2]

Build configuration:

• Updated rollup.config.mts to include CommonJS and JSON plugins, and modified the external configuration to ensure required dependencies (like browserify-aes and md5.js) are bundled, avoiding outdated versions from other packages. [1] [2]

Next steps

• Use createCipheriv and createDecipheriv in StreamrTV's tv-engine package, and in the SDK.

[Copilot]

Pull request overview

This pull request adds cross-environment AES encryption/decryption utilities to the @streamr/utils package, enabling both browser and Node.js environments to use cipher operations through a unified API.

Key Changes

• Added createCipheriv and createDecipheriv functions for both browser (using browserify-aes) and Node.js (using native crypto module)
• Updated build configuration to bundle necessary cryptographic dependencies for browser environments
• Added TypeScript type definitions for browserify-aes library

Reviewed changes

Copilot reviewed 5 out of 7 changed files in this pull request and generated 9 comments.

Show a summary per file

File	Description
packages/utils/src/browser/crypto.ts	Implements AES cipher functions for browsers using browserify-aes with algorithm validation
packages/utils/src/nodejs/crypto.ts	Implements cipher functions as thin wrappers around Node.js native crypto module
packages/utils/src/browserify-aes.d.ts	Adds TypeScript type definitions for browserify-aes library
packages/utils/src/exports.ts	Exports new cipher functions from the crypto module
packages/utils/package.json	Adds browserify-aes, md5.js dependencies and CommonJS/JSON rollup plugins
packages/utils/rollup.config.mts	Configures bundling to include specific crypto dependencies for browser builds
package-lock.json	Updates lockfile with new dependencies and their transitive dependencies

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[Copilot]

The regular expression pattern excludes buffer-xor from bundling, but buffer-xor is a dependency of browserify-aes. This may cause runtime errors if the bundler doesn't automatically include it. Consider adding buffer-xor to the list of bundled dependencies in the negative lookahead pattern.

Suggested change

	/node_modules\/(?!browserify-aes|cipher-base|evp_bytestokey|md5.js|hash-base)/,
	/node_modules\/(?!browserify-aes|buffer-xor|cipher-base|evp_bytestokey|md5.js|hash-base)/,