crypto

Documentation

Index

• func DecryptSymmetric(key []byte, cyphertext []byte) ([]byte, error)
• func EncryptSymmetric(key, plaintext []byte) ([]byte, error)
• func ExtractSignatures(signaturePairs [][2]string) ([]string, error)
• func Sign(content string, identity *ecdsa.PrivateKey) (string, error)
• func VerifySignatures(signaturePairs [][3]string) error
• type DHPair
  • func (p DHPair) PrivateKey() dr.Key
  • func (p DHPair) PublicKey() dr.Key
• type EthereumCrypto
  • func (c EthereumCrypto) DH(dhPair dr.DHPair, dhPub dr.Key) dr.Key
  • func (c EthereumCrypto) Decrypt(mk dr.Key, authCiphertext, ad []byte) ([]byte, error)
  • func (c EthereumCrypto) Encrypt(mk dr.Key, plaintext, ad []byte) []byte
  • func (c EthereumCrypto) GenerateDH() (dr.DHPair, error)
  • func (c EthereumCrypto) KdfCK(ck dr.Key) (chainKey dr.Key, msgKey dr.Key)
  • func (c EthereumCrypto) KdfRK(rk, dhOut dr.Key) (rootKey, chainKey, headerKey dr.Key)

Functions

func DecryptSymmetric

func DecryptSymmetric(key []byte, cyphertext []byte) ([]byte, error)

func EncryptSymmetric

func EncryptSymmetric(key, plaintext []byte) ([]byte, error)

func ExtractSignatures

func ExtractSignatures(signaturePairs [][2]string) ([]string, error)

ExtractSignatures extract from tuples of signatures content a public key

func Sign

func Sign(content string, identity *ecdsa.PrivateKey) (string, error)

Sign signs the hash of an arbitrary string

func VerifySignatures

func VerifySignatures(signaturePairs [][3]string) error

VerifySignatures verifys tuples of signatures content/hash/public key

Types

type DHPair

type DHPair struct {
	PrvKey dr.Key
	PubKey dr.Key
}

func (DHPair) PrivateKey

func (p DHPair) PrivateKey() dr.Key

func (DHPair) PublicKey

func (p DHPair) PublicKey() dr.Key

type EthereumCrypto

type EthereumCrypto struct{}

EthereumCrypto is an implementation of Crypto with cryptographic primitives recommended by the Double Ratchet Algorithm specification. However, some details are different, see function comments for details.

func (EthereumCrypto) DH

func (c EthereumCrypto) DH(dhPair dr.DHPair, dhPub dr.Key) dr.Key

See the Crypto interface.

func (EthereumCrypto) Decrypt

func (c EthereumCrypto) Decrypt(mk dr.Key, authCiphertext, ad []byte) ([]byte, error)

See the Crypto interface.

func (EthereumCrypto) Encrypt

func (c EthereumCrypto) Encrypt(mk dr.Key, plaintext, ad []byte) []byte

Encrypt uses a slightly different approach than in the algorithm specification: it uses AES-256-CTR instead of AES-256-CBC for security, ciphertext length and implementation complexity considerations.

func (EthereumCrypto) GenerateDH

func (c EthereumCrypto) GenerateDH() (dr.DHPair, error)

See the Crypto interface.

func (EthereumCrypto) KdfCK

func (c EthereumCrypto) KdfCK(ck dr.Key) (chainKey dr.Key, msgKey dr.Key)

See the Crypto interface.

func (EthereumCrypto) KdfRK

func (c EthereumCrypto) KdfRK(rk, dhOut dr.Key) (rootKey, chainKey, headerKey dr.Key)

See the Crypto interface.