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19 lines
540 B
19 lines
540 B
use num_bigint::BigUint;
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pub fn u256_to_u64(a: [u8; 32]) -> u64 {
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let mut b8: [u8; 8] = [0; 8];
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b8.copy_from_slice(&a[32 - 8..32]);
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u64::from_be_bytes(b8)
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}
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pub fn usize_to_u256(i: usize) -> [u8; 32] {
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let i_bytes = i.to_be_bytes();
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let mut r: [u8; 32] = [0; 32];
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r[32 - i_bytes.len()..].copy_from_slice(&i_bytes);
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r
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}
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pub fn str_to_u256(s: &str) -> [u8; 32] {
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let bi = s.parse::<BigUint>().unwrap().to_bytes_be();
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let mut r: [u8; 32] = [0; 32];
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r[32 - bi.len()..].copy_from_slice(&bi[..]);
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r
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}
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