rsa_encrypt: Low-level RSA encryption

In jrdenggithub/opensslNV: Toolkit for Encryption, Signatures and Certificates Based on OpenSSL

Description

Asymmetric encryption and decryption with RSA. Because RSA can only encrypt messages smaller than the size of the key, it is typically used only for exchanging a random session-key. This session key is used to encipher arbitrary sized data via a stream cipher such as aes_cbc. See encrypt_envelope for a high-level wrappers combining RSA and AES in this way.

Usage

rsa_encrypt(data, pubkey = my_pubkey())

rsa_decrypt(data, key = my_key(), password = askpass)

Arguments

data	raw vector of max 245 bytes (for 2048 bit keys) with data to encrypt/decrypt
pubkey	public key or file path. See read_pubkey.
key	private key or file path. See read_key.
password	string or a function to read protected keys. See read_key.

Examples

# Generate test keys
key <- rsa_keygen()
pubkey <- key$pubkey

# Encrypt data with AES
tempkey <- rand_bytes(32)
iv <- rand_bytes(16)
blob <- aes_cbc_encrypt(system.file("CITATION"), tempkey, iv = iv)

# Encrypt tempkey using receivers public RSA key
ciphertext <- rsa_encrypt(tempkey, pubkey)

# Receiver decrypts tempkey from private RSA key
tempkey <- rsa_decrypt(ciphertext, key)
message <- aes_cbc_decrypt(blob, tempkey, iv)
out <- rawToChar(message)

jrdenggithub/opensslNV documentation built on May 30, 2019, 12:02 a.m.