Input too large for RSA cipher

[chandaniBhalala]

Getting this exception "Input too large for RSA cipher" when encrypting string with more than 64 characters.
Is there any limit of number of characters for encryption?

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[mnesarco]

RSA can only encrypt payloads smaller than the key size, so the usual way to use that is:

Given a payload P and a public key PK:

1. Generate a random key K
2. Encrypt the payload P with symmetric encryption (ie AES) using the generated key: EP = AESEncrypt( P, K )
3. Encrypt the key K with RSA and public key PK: EK = RSAEncrypt( K, PK )
4. Build a package PKG with encrypted key, encrypted payload and size: PKG = { EK, EP, size_of(P) }

Then to decrypt do the opposite:

Given a package PKG and a private key PRIVK:

1. Extract parts from package: { EK, EP, SIZE } = PKG
2. Decrypt the key K from EK with RSA and private key: K = RSADecrypt( EK, PRIVK )
3. Decrypt the payload P using the key K and symmetric encryption: P = AESDecrypt( EP, K )
4. Remove Padding: P = Trim_To( P, SIZE )