Module streaming_attachment_cipher 

AsyncRead / AsyncWrite wrapper around the streaming attachment ciphers.

Wire format

[discriminator (1 byte)] [format-specific header] [ciphertext...]

• 0x02 is AES256-CBC-HMAC-Legacy-Stream

0x02 matches the long-standing EncString::Aes256Cbc_HmacSha256_B64 = 2 numbering.

Structs

StreamingAttachmentDecryptor

AsyncRead adapter that decrypts a streaming-attachment-encrypted wire stream from R and exposes the decrypted plaintext via [AsyncRead]. The cipher is selected by the 1-byte discriminator at the start of the wire and must agree with the supplied key.

StreamingAttachmentEncryptor

AsyncWrite adapter that takes plaintext and writes a streaming-attachment-encrypted wire stream to W. The cipher is selected by the SymmetricCryptoKey variant. The 1-byte discriminator is emitted before any plaintext is encrypted.

UnknownDiscriminator 🔒

Enums

HeaderDiscriminator 🔒

StreamDecryptorState 🔒

StreamEncryptorState 🔒

Constants

READ_SCRATCH_SIZE 🔒

Functions

clone_io_error 🔒

io::Error is neither Clone nor Copy, so a stored error cannot be returned by value on a subsequent poll. Reconstruct an equivalent error (kind + message) to re-report it.