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RSA encrypt and decrypt
Crypto and hashing
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About this tool
Generate a 2048-bit RSA-OAEP keypair and encrypt/decrypt short UTF-8 messages with SHA-256.
Common uses
- Generate a 2048-bit RSA-OAEP keypair and encrypt/decrypt short UTF-8 messages with SHA-256.
- Generate keys or enter an SPKI PUBLIC KEY PEM for encryption.
How to use it
- 1.Generate keys or enter an SPKI PUBLIC KEY PEM for encryption.
- 2.Encrypt up to 190 UTF-8 bytes; decrypt Base64 ciphertext using a PKCS#8 PRIVATE KEY PEM.
Limits and notes
- Supports this OAEP/SHA-256 flow, not signatures or arbitrary PEM types. Ciphertext must be 256 bytes; keep the private key private and do not expect file-sized payloads.
Frequently asked questions
What does this tool do?
Generate a 2048-bit RSA-OAEP keypair and encrypt/decrypt short UTF-8 messages with SHA-256.
What should I check before using the result?
Supports this OAEP/SHA-256 flow, not signatures or arbitrary PEM types. Ciphertext must be 256 bytes; keep the private key private and do not expect file-sized payloads.