Ismail Khoffi 6485e68beb Use ethereum's secp256k1 lib (#3234)
* switch from fork (tendermint/btcd) to orig package (btcsuite/btcd); also

 - remove obsolete check in test `size != -1` is always true
 - WIP as the serialization still needs to be wrapped

* WIP: wrap signature & privkey, pubkey needs to be wrapped as well

* wrap pubkey too

* use "github.com/ethereum/go-ethereum/crypto/secp256k1" if cgo is
available, else use "github.com/btcsuite/btcd/btcec" and take care of
lower-S when verifying

Annoyingly, had to disable pruning when importing
github.com/ethereum/go-ethereum/ :-/

* update comment

* update comment

* emulate signature_nocgo.go for additional benchmarks:
592bf6a59c/crypto/signature_nocgo.go (L60-L76)

* use our format (r || s) in lower-s form when in the non-cgo case

* remove comment about using the C library directly

* vendor github.com/btcsuite/btcd too

* Add test for the !cgo case

* update changelog pending

Closes #3162 #3163
Refs #1958, #2091, tendermint/btcd#1
2019-02-04 12:24:54 +04:00
..
2018-06-20 15:30:44 -07:00
2018-11-01 02:07:18 -04:00
2018-06-20 17:34:28 -07:00
2018-06-20 15:30:44 -07:00

crypto

crypto is the cryptographic package adapted for Tendermint's uses

Importing it

To get the interfaces, import "github.com/tendermint/tendermint/crypto"

For any specific algorithm, use its specific module e.g. import "github.com/tendermint/tendermint/crypto/ed25519"

If you want to decode bytes into one of the types, but don't care about the specific algorithm, use import "github.com/tendermint/tendermint/crypto/amino"

Binary encoding

For Binary encoding, please refer to the Tendermint encoding spec.

JSON Encoding

crypto .Bytes() uses Amino:binary encoding, but Amino:JSON is also supported.

Example Amino:JSON encodings:

ed25519.PrivKeyEd25519     - {"type":"954568A3288910","value":"EVkqJO/jIXp3rkASXfh9YnyToYXRXhBr6g9cQVxPFnQBP/5povV4HTjvsy530kybxKHwEi85iU8YL0qQhSYVoQ=="}
ed25519.PubKeyEd25519      - {"type":"AC26791624DE60","value":"AT/+aaL1eB0477Mud9JMm8Sh8BIvOYlPGC9KkIUmFaE="}
crypto.PrivKeySecp256k1   - {"type":"019E82E1B0F798","value":"zx4Pnh67N+g2V+5vZbQzEyRerX9c4ccNZOVzM9RvJ0Y="}
crypto.PubKeySecp256k1    - {"type":"F8CCEAEB5AE980","value":"A8lPKJXcNl5VHt1FK8a244K9EJuS4WX1hFBnwisi0IJx"}