| 85 | |
| 86 | #[test] |
| 87 | fn test_sub() { |
| 88 | println!("Fr.sub: {} bytes", Fr::sub(0, 1).len()); |
| 89 | |
| 90 | let m = BigUint::from_str_radix(Fr::MODULUS, 16).unwrap(); |
| 91 | |
| 92 | let mut prng = ChaCha20Rng::seed_from_u64(0); |
| 93 | |
| 94 | for _ in 0..100 { |
| 95 | let a: BigUint = prng.sample(RandomBits::new(254)); |
| 96 | let b: BigUint = prng.sample(RandomBits::new(254)); |
| 97 | |
| 98 | let a = a.rem(&m); |
| 99 | let b = b.rem(&m); |
| 100 | let c: BigUint = a.clone().add(&m).sub(b.clone()).rem(&m); |
| 101 | |
| 102 | let script = script! { |
| 103 | { Fr::push_u32_le(&a.to_u32_digits()) } |
| 104 | { Fr::push_u32_le(&b.to_u32_digits()) } |
| 105 | { Fr::sub(1, 0) } |
| 106 | { Fr::push_u32_le(&c.to_u32_digits()) } |
| 107 | { Fr::equalverify(1, 0) } |
| 108 | OP_TRUE |
| 109 | }; |
| 110 | run(script); |
| 111 | } |
| 112 | } |
| 113 | |
| 114 | #[test] |
| 115 | fn test_double() { |