jsencrypt is a JavaScript library for performing RSA encryption, decryption, and key generation. It functions as an asymmetric key generator and digital signature provider that executes all cryptographic processing directly in the browser.
The library focuses on the use of the PEM standard for importing, exporting, and managing cryptographic keys. It provides the ability to create public and private RSA key pairs of various bit sizes and supports OpenSSL compatible formats.
Its capabilities cover the transformation of plaintext into ciphertext and the recovery of original messages using corresponding keys. It also enables the creation and validation of digital signatures to ensure data integrity and authenticity.