decrypt_file {safer}

Decrypt a file

Description

encrypt_file) encrypts a file as a binary or a ascii file. decrypt_file) decrypts a text or a binary file (encrypted by encrypt_file)

Usage

decrypt_file(infile, key = "pass", pkey = NULL, ascii = FALSE, outfile)

Arguments

infile

file to be decrypted

key

For symmetric decryption, 'pkey' should be NULL (default) and 'key' can be either a string (Default is 'pass') or a raw object. For asymmetric decryption, both 'key' (private key of the decrypter) and 'pkey' (public key of the encrypter) should be raw objects.

pkey

See 'key'

ascii

TRUE if the outfile is to be decrypted as a ascii file. Default is FALSE

outfile

Non-existant file where the decrypted output is to be written

Value

An invisible TRUE

Examples

# symmetric case:
write.table(iris, "iris.csv")
all(
  encrypt_file("iris.csv", outfile = "iris_encrypted.bin")
  , file.exists("iris_encrypted.bin")
  , decrypt_file("iris_encrypted.bin", outfile = "iris_2.csv")
  , file.exists("iris_2.csv")
  , tools::md5sum("iris_2.csv") == tools::md5sum("iris.csv")
  , unlink("iris.csv") == 0
  , unlink("iris_2.csv") == 0
  , unlink("iris_encrypted.bin") == 0
)

write.table(iris, "iris.csv")
all(
  encrypt_file("iris.csv", outfile = "iris_encrypted.txt", ascii = TRUE)
  , file.exists("iris_encrypted.txt")
  , decrypt_file("iris_encrypted.txt", outfile = "iris_2.csv", ascii = TRUE)
  , file.exists("iris_2.csv")
  , tools::md5sum("iris_2.csv") == tools::md5sum("iris.csv")
  , unlink("iris.csv") == 0
  , unlink("iris_2.csv") == 0
  , unlink("iris_encrypted.txt") == 0
)

# asymmetric case:
alice <- keypair()
bob   <- keypair()
write.table(iris, "iris.csv")
all(
  encrypt_file("iris.csv", alice$private_key, bob$public_key, outfile = "iris_encrypted.bin")
  , file.exists("iris_encrypted.bin")
  , decrypt_file("iris_encrypted.bin", bob$private_key, alice$public_key, outfile = "iris_2.csv")
  , file.exists("iris_2.csv")
  , tools::md5sum("iris_2.csv") == tools::md5sum("iris.csv")
  , unlink("iris.csv") == 0
  , unlink("iris_2.csv") == 0
  , unlink("iris_encrypted.bin") == 0
)