Module chain_crypto::multilock

Similar to asymlock but takes a set of recipients instead of a unique receiver

• prime order group for DH
• HKDF for KDF
• chacha20poly1305 for symmetric encryption algorithm

the format is the concat of:

• 1 byte of version: hardcoded to 1
• 1 byte of magic set to 0x12
• 1 byte of magic set to 0x34
• 1 byte from the number of participants
• ephemeral public key: base GroupElement size bytes
• recipient data (number of participants time) where each recipient is:
  • recipient public key
  • session key
• encrypted payload (cipher=chacha-poly1305)
  • authenticated tag
  • encrypted data

the data encrypted with a ephemeral public key in prefix and the poly1305 tag in suffix.

Enums

• DecryptionError

Constants

• EPHEMERAL_PK_SIZE 🔒
• HEADER_SIZE 🔒
• PAD1 🔒
• PAD2 🔒
• RECIPIENT_KEY_SIZE 🔒
• SESSION_KEY_SIZE 🔒
• TAG_SIZE 🔒

Functions

• decrypt
  Decrypt data in the asymmetric lock. this is the dual of ‘encrypt’. The data should in the form:
• encrypt
  Encrypt data in an assymetric lock for multiple recipients
• nb_participants
• participants
• prefix_size 🔒
• recipient_public_key_nth 🔒
• recipient_public_key_nth_point 🔒
• recipient_session_key_nth 🔒
• recipient_start 🔒
• scheme_overhead 🔒
• shared_key_to_symmetric_key 🔒