CAT can reduce curve point scalar multiplication to a subtraction in the scalar field.
Subtraction of field elements can probably be emulated in less than 250 (?) opcodes. For now, let's assume we had an (emulated) opcode, op_scalar_sub, for subtracting two elements of the scalar field of secp256k1.
Given secp's generator G, we want to compute for some scalar r the point R = rG
That is possible by hacking it into a Schnorr signature (R,s) for the key P = xG = 1G = G
The goal of this protocol is for Bob to get Alice to perform a Diffie-Hellman key exchange blindly, such that when the unblinded value is returned, Alice recognizes it as her own, but can’t distinguish it from others (i.e. similar to a blind signature).
Alice:
A = a*G
return A
Bob:
Y = hash_to_curve(secret_message)
r = random blinding factor
| /* | |
| * Handling Errors using async/await | |
| * Has to be used inside an async function | |
| */ | |
| try { | |
| const response = await axios.get('https://your.site/api/v1/bla/ble/bli'); | |
| // Success 🎉 | |
| console.log(response); | |
| } catch (error) { | |
| // Error 😨 |
| /* | |
| * A simple example of json string parsing with json-c. | |
| * | |
| * clang -Wall -g -I/usr/include/json-c/ -o json_parser json_parser.c -ljson-c | |
| */ | |
| #include <json.h> | |
| #include <stdio.h> | |
| int main() { | |
| struct json_object *jobj; |
| {url:'stun:stun01.sipphone.com'}, | |
| {url:'stun:stun.ekiga.net'}, | |
| {url:'stun:stun.fwdnet.net'}, | |
| {url:'stun:stun.ideasip.com'}, | |
| {url:'stun:stun.iptel.org'}, | |
| {url:'stun:stun.rixtelecom.se'}, | |
| {url:'stun:stun.schlund.de'}, | |
| {url:'stun:stun.l.google.com:19302'}, | |
| {url:'stun:stun1.l.google.com:19302'}, | |
| {url:'stun:stun2.l.google.com:19302'}, |