module SJCL

# File lib/sjcl.rb, line 19
def self.decrypt(password, jsonstr)
  cipher_obj = JSON.parse(jsonstr, :symbolize_names => true)
  key = SJCL::Misc.pbkdf2(password,
                          cipher_obj[:salt],
                          cipher_obj[:iter],
                          cipher_obj[:ks])
  cipher = SJCL::Cipher::AES.new(key)

  ct = SJCL::Codec::Base64.toBits(cipher_obj[:ct])
  iv = SJCL::Codec::Base64.toBits(cipher_obj[:iv])
  adata = SJCL::Codec::Base64.toBits(cipher_obj[:adata])
  out = SJCL::Mode::CCM.decrypt(cipher, ct, iv, adata)
  SJCL::Codec::UTF8String.fromBits(out)
end

# File lib/sjcl.rb, line 34
def self.encrypt(password, str, opts={})
  opts = DEFAULT.merge(opts)
  iv = SJCL::Random.randomWords(4)
  salt = SJCL::Codec::Base64.fromBits(SJCL::Random.randomWords(2))
  key = SJCL::Misc.pbkdf2(password,
                          salt,
                          opts[:iter],
                          opts[:ks])
  cipher = SJCL::Cipher::AES.new(key)
  pt = SJCL::Codec::UTF8String.toBits(str)
  adata = SJCL::Codec::UTF8String.toBits(opts[:adata])
  ct = SJCL::Mode::CCM.encrypt(cipher, pt, iv, adata)
  ct = SJCL::Codec::Base64.fromBits(ct)
  out = opts.merge({
    :ct => ct,
    :iv => SJCL::Codec::Base64.fromBits(iv),
    :salt => salt
    })
  out.to_json
end