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(Ruby) Encrypting a Data StreamThis example illustrates encrypting a large dataset using symmetric encryption algorithms like
You can provide data chunks smaller than the encryption algorithm's block size. For example, AES uses 16-byte blocks;
Chilkat handles the buffering of data as needed. If a data chunk smaller than the block size is provided, an empty string (or 0 bytes) is returned, and the data is buffered to be combined with subsequent chunks. The final chunk is padded to the algorithm's block size (as determined by the Chunk-wise decryption follows the same procedure as chunk-wise encryption.
require 'chilkat' # This example requires the Chilkat API to have been previously unlocked. # See Global Unlock Sample for sample code. crypt = Chilkat::CkCrypt2.new() crypt.put_CryptAlgorithm("aes") crypt.put_CipherMode("cbc") crypt.put_KeyLength(128) crypt.SetEncodedKey("000102030405060708090A0B0C0D0E0F","hex") crypt.SetEncodedIV("000102030405060708090A0B0C0D0E0F","hex") crypt.put_EncodingMode("hex") txt1 = "The quick brown fox jumped over the lazy dog.\r\n" txt2 = "-\r\n" txt3 = "Done.\r\n" sbEncrypted = Chilkat::CkStringBuilder.new() # Encrypt the 1st chunk: # (don't worry about feeding the data to the encryptor in # exact multiples of the encryption algorithm's block size. # Chilkat will buffer the data.) crypt.put_FirstChunk(true) crypt.put_LastChunk(false) sbEncrypted.Append(crypt.encryptStringENC(txt1)) # Encrypt the 2nd chunk crypt.put_FirstChunk(false) crypt.put_LastChunk(false) sbEncrypted.Append(crypt.encryptStringENC(txt2)) # Now encrypt N more chunks... # Remember -- we're doing this in CBC mode, so each call # to the encrypt method depends on the state from previous # calls... crypt.put_FirstChunk(false) crypt.put_LastChunk(false) for i in 0 .. 4 sbEncrypted.Append(crypt.encryptStringENC(txt1)) sbEncrypted.Append(crypt.encryptStringENC(txt2)) end # Now encrypt the last chunk: crypt.put_FirstChunk(false) crypt.put_LastChunk(true) sbEncrypted.Append(crypt.encryptStringENC(txt3)) print sbEncrypted.getAsString() + "\n"; # Now decrypt in one call. # (The data we're decrypting is both the first AND last chunk.) crypt.put_FirstChunk(true) crypt.put_LastChunk(true) decryptedText = crypt.decryptStringENC(sbEncrypted.getAsString()) print decryptedText + "\n"; # Note: You may decrypt in N chunks by setting the FirstChunk # and LastChunk properties prior to calling the Decrypt* methods |
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