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libcryptoconditions

Interledger Crypto-Conditions in C, targeting spec draft-thomas-crypto-conditions-03.

Features shared object and easy to use JSON api, as well as a command line interface written in Python.

Quickstart

git clone --recursive https://github.com/libscott/libcryptoconditions
cd libcryptoconditions
./autogen.sh
./configure
make
./cryptoconditions.py --help

Status

JSON interface may not be particularly safe.

Testing

After building:

make test

Embedding

For the binary interface, see cryptoconditions.h.

To embed in other languages, the easiest way may be to call the JSON RPC method via FFI. This is how it looks in Python:

import json
from ctypes import *

so = cdll.LoadLibrary('.libs/libcryptoconditions.so')
so.jsonRPC.restype = c_char_p

def call_cryptoconditions_rpc(method, params):
    out = so.jsonRPC(json.dumps({
        'method': method,
        'params': params,
    }))
    return json.loads(out)

JSON methods

encodeCondition

Encode a JSON condition to a base64 binary string

cryptoconditions encodeCondition '{
    "type": "ed25519-sha-256",
    "publicKey": "11qYAYKxCrfVS_7TyWQHOg7hcvPapiMlrwIaaPcHURo"
}'
{
    "bin": "pCeAIHmSOauo_E_36r-8TETmnovf7ZkzJOEu1keSq-KJzx1fgQMCAAA", 
    "uri": "ni:///sha-256;eZI5q6j8T_fqv7xMROaei9_tmTMk4S7WR5Kr4onPHV8?fpt=ed25519-sha-256&cost=131072"
}

decodeCondition

Decode a binary condition

cryptoconditions decodeCondition '{
    "bin": "pCeAIHmSOauo_E_36r-8TETmnovf7ZkzJOEu1keSq-KJzx1fgQMCAAA"
}'
{
    "bin": "pCeAIHmSOauo_E_36r-8TETmnovf7ZkzJOEu1keSq-KJzx1fgQMCAAA", 
    "uri": "ni:///sha-256;eZI5q6j8T_fqv7xMROaei9_tmTMk4S7WR5Kr4onPHV8?fpt=ed25519-sha-256&cost=131072"
}

encodeFulfillment

Encode a JSON condition to a binary fulfillment. The condition must be fulfilled, that is, it needs to have signatures present.

cryptoconditions encodeFulfillment '{
{
    "type": "ed25519-sha-256",
    "publicKey": "E0x0Ws4GhWhO_zBoUyaLbuqCz6hDdq11Ft1Dgbe9y9k",
    "signature": "jcuovSRpHwqiC781KzSM1Jd0Qtyfge0cMGttUdLOVdjJlSBFLTtgpinASOaJpd-VGjhSGWkp1hPWuMAAZq6pAg"
}'
{
    "fulfillment": "pGSAIBNMdFrOBoVoTv8waFMmi27qgs-oQ3atdRbdQ4G3vcvZgUCNy6i9JGkfCqILvzUrNIzUl3RC3J-B7Rwwa21R0s5V2MmVIEUtO2CmKcBI5oml35UaOFIZaSnWE9a4wABmrqkC"
}

decodeFulfillment

Decode a binary fulfillment

cryptoconditions decodeFulfillment '{
    "fulfillment": "pGSAINdamAGCsQq31Uv-08lkBzoO4XLz2qYjJa8CGmj3B1EagUDlVkMAw2CscpCG4syAboKKhId_Hrjl2XTYc-BlIkkBVV-4ghWQozusxh45cBz5tGvSW_XwWVu-JGVRQUOOehAL"
}'
{
    "bin": "pCeAIHmSOauo_E_36r-8TETmnovf7ZkzJOEu1keSq-KJzx1fgQMCAAA", 
    "uri": "ni:///sha-256;eZI5q6j8T_fqv7xMROaei9_tmTMk4S7WR5Kr4onPHV8?fpt=ed25519-sha-256&cost=131072"
}

verifyFulfillment

Verify a fulfillment against a message and a condition URL

cryptoconditions verifyFulfillment '{
    "message": "",
    "fulfillment": "pGSAINdamAGCsQq31Uv-08lkBzoO4XLz2qYjJa8CGmj3B1EagUDlVkMAw2CscpCG4syAboKKhId_Hrjl2XTYc-BlIkkBVV-4ghWQozusxh45cBz5tGvSW_XwWVu-JGVRQUOOehAL",
    "condition": "pCeAIHmSOauo_E_36r-8TETmnovf7ZkzJOEu1keSq-KJzx1fgQMCAAA"
}
{
    "valid": true
}

signTreeEd25519

Sign all ed25519 nodes in a condition tree

cryptoconditions signTreeEd25519 '{
    "condition": {
        "type": "ed25519-sha-256",
        "publicKey": "E0x0Ws4GhWhO_zBoUyaLbuqCz6hDdq11Ft1Dgbe9y9k",
    },
    "privateKey": "11qYAYKxCrfVS_7TyWQHOg7hcvPapiMlrwIaaPcHURo",
    "message": "",
}'
{
    "num_signed": 1,
    "condition": {
        "type": "ed25519-sha-256",
        "publicKey": "E0x0Ws4GhWhO_zBoUyaLbuqCz6hDdq11Ft1Dgbe9y9k",
        "signature": "jcuovSRpHwqiC781KzSM1Jd0Qtyfge0cMGttUdLOVdjJlSBFLTtgpinASOaJpd-VGjhSGWkp1hPWuMAAZq6pAg"
    }
}

signTreeSecp256k1

Sign all secp256k1 nodes in a condition tree

cryptoconditions signTreeSecp256k1 '{
    "condition": {
        "type": "secp256k1-sha-256",
        "publicKey": "AmkauD4tVL5-I7NN9hE_A8SlA0WdCIeJe_1Nac_km1hr",
    },
    "privateKey": "Bxwd5hOLZcTvzrR5Cupm3IV7TWHHl8nNLeO4UhYfRs4",
    "message": "",
}'
{
    "num_signed": 1,
    "condition": {
        "type": "secp256k1-sha-256",
        "publicKey": "AmkauD4tVL5-I7NN9hE_A8SlA0WdCIeJe_1Nac_km1hr",
        "signature": "LSQLzZo4cmt04KoCdoFcbIJX5MZ9CM6324SqkdqV1PppfUwquiWa7HD97hf4jdkdqU3ep8ZS9AU7zEJoUAl_Gg"
    }
}