Module chacha20_poly1305_openssh

The chacha20-poly1305@openssh.com AEAD-ish construct.

This should only be used by SSH implementations. It has a similar, but different API from aws_lc_rs::aead because the construct cannot use the same API as aws_lc_rs::aead due to the way the construct handles the encrypted packet length.

The concatenation of a and b is denoted a||b. K_1 and K_2 are defined in the chacha20-poly1305@openssh.com specification. packet_length, padding_length, payload, and random padding are defined in RFC 4253. The term plaintext is used as a shorthand for padding_length||payload||random padding.

FIPS

The APIs offered in this module must not be used.

Structs

• OpeningKey
  A key for opening packets.
• SealingKey
  A key for sealing packets.

Constants

• KEY_LEN
  The length of key.
• PACKET_LENGTH_LEN
  The length in bytes of the packet_length field in a SSH packet.
• TAG_LEN
  The length in bytes of an authentication tag.