RSA Encrypt & Decrypt Tool
RSA Encrypt & Decrypt Tool: Imports RSA public key via SubtleCrypto, applies Optimal Asymmetric Encryption Padding (OAEP), and outputs ciphertext.
About this rsa encrypt & decrypt tool
RSA Encrypt & Decrypt Tool — browser-based utility.
How this tool works
Implements client-side RSA Encrypt & Decrypt Tool operations. Imports RSA public key via SubtleCrypto, applies Optimal Asymmetric Encryption Padding (OAEP), and outputs ciphertext specifically designed for a security engineer encrypts a session key using an rsa public key with rsa-oaep padding.
- Key Derivation & CSPRNG Nonce Generation: Derives cryptographic keys from passphrases via PBKDF2 with random salts and generates unique IV nonces.
- Authenticated Encryption (AEAD): Encrypts plaintext blocks and computes an authentication tag to protect against ciphertext tampering.
- Container Formatting: Packages salt, IV, ciphertext, and auth tag into standardized Base64 or JSON envelopes.
- Decryption & Tamper Verification: Verifies the authentication tag before decrypting; throws immediate integrity errors if data was modified.
Worked example
Scenario: A security engineer encrypts a session key using an RSA public key with RSA-OAEP padding.
Sample input:
Processing: Imports RSA public key via SubtleCrypto, applies Optimal Asymmetric Encryption Padding (OAEP), and outputs ciphertext.
Illustrative output:
Limits and verification
Never reuses an Initialization Vector (IV) with the same key (IV reuse in GCM mode destroys authenticity and leaks plaintext). Passphrases cannot be recovered if lost, as no backdoor or recovery key exists.
Examples demonstrate an expected workflow; they do not prove every input or every branch of an external specification. Check important results with an independent source before using them for money, security, compliance, safety, or irreversible file changes.
Browser processing boundary
Tool input is processed by code running in the browser and is not intentionally sent to a CZOA processing API. The page can still request ordinary site assets, analytics, or advertising when those services are enabled. Browser extensions and managed-device software remain outside this tool's control.
Relevant references
These references govern or help explain the format, protocol, or calculation used here. Listing a reference does not claim certification or complete implementation of every optional feature.
Content owner: CZOA Tools · Last reviewed: 2026-09-15 · Review methodology
How to use it
- Enter, paste, or select your input data into the RSA Encrypt & Decrypt Tool workspace controls.
- Review available parameter fields, units, formats, or options configured for your task.
- Click the action button or observe immediate live calculations rendered in your browser runtime.
- Inspect the resulting output and any diagnostic messages, then copy or download the result if needed.
Frequently asked questions
What input does RSA Encrypt/Decrypt require for encryption?+
Its JSON encrypt operation requires plaintext or text and a publicJwk from the RSA key generator. Without publicJwk the page returns a required-key error.
What did the browser fixture verify?+
It generated a new key, passed that publicJwk with plaintext abc, and received an RSA-OAEP-SHA256 ciphertext.
What is required for decryption?+
Decrypt requires privateJwk and ciphertext from a matching RSA-OAEP key pair. The tool imports the JWK with SHA-256 before decrypting.
Can RSA encrypt arbitrarily large content?+
No. RSA-OAEP has a size limit tied to modulus and hash. Use RSA for small keys or payloads and a symmetric cipher for larger data.