Struct Envelope 

pub struct Envelope {
    pub kms_manager: Manager,
    pub kms_key_id: String,
    pub aad_tag: String,
}

Implements envelope encryption manager.

Fields

kms_manager: Manager

kms_key_id: String

aad_tag: String

Represents additional authenticated data (AAD) that attaches information to the ciphertext that is not encrypted.

Implementations

impl Envelope

pub async fn seal_aes_256(&self, d: &[u8]) -> Result<Vec<u8>>

Envelope-encrypts the data using AWS KMS data-encryption key (DEK) and “AES_256_GCM”, since kms:Encrypt can only encrypt 4 KiB). The encrypted data are aligned as below: [ Nonce bytes “length” ][ DEK.ciphertext “length” ][ Nonce bytes ][ DEK.ciphertext ][ data ciphertext ]

pub async fn unseal_aes_256(&self, d: &[u8]) -> Result<Vec<u8>>

Envelope-decrypts using KMS DEK and “AES_256_GCM”. Assume the input (ciphertext) data are packed in the order of: [ Nonce bytes “length” ][ DEK.ciphertext “length” ][ Nonce bytes ][ DEK.ciphertext ][ data ciphertext ]

pub async fn seal_aes_256_file( &self, src_file: Arc<String>, dst_file: Arc<String>, ) -> Result<()>

Envelope-encrypts data from a file and save the ciphertext to the other file.

“If a single piece of data must be accessible from more than one task concurrently, then it must be shared using synchronization primitives such as Arc.” ref. https://tokio.rs/tokio/tutorial/spawning

pub async fn unseal_aes_256_file( &self, src_file: Arc<String>, dst_file: Arc<String>, ) -> Result<()>

Envelope-decrypts data from a file and save the plaintext to the other file.

pub async fn compress_seal( &self, src_file: Arc<String>, dst_file: Arc<String>, ) -> Result<()>

Compresses the source file (“src_file”) and envelope-encrypts to “dst_file”. The compression uses “zstd”. The encryption uses AES 256.

pub async fn unseal_decompress( &self, src_file: Arc<String>, dst_file: Arc<String>, ) -> Result<()>

Reverse of “compress_seal”. The decompression uses “zstd”. The decryption uses AES 256.

Trait Implementations

impl Clone for Envelope

fn clone(&self) -> Envelope

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.