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fix: encoding Falcon secret key basis polynomials (#319)

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Al-Kindi-0 2024-05-29 08:20:28 +02:00 • committed by GitHub
parent 78ac70120d
commit 8556c8fc43
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GPG key ID: B5690EEEBB952194
1 changed files with 15 additions and 3 deletions
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18
src/dsa/rpo_falcon512/keys/secret_key.rs
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@ -217,15 +217,27 @@ impl Serializable for SecretKey {
let mut buffer = Vec::with_capacity(1281);
buffer.push(header);
let f_i8: Vec<i8> = neg_f.coefficients.iter().map(|&a| -a as i8).collect();
let f_i8: Vec<i8> = neg_f
.coefficients
.iter()
.map(|&a| FalconFelt::new(-a).balanced_value() as i8)
.collect();
let f_i8_encoded = encode_i8(&f_i8, WIDTH_SMALL_POLY_COEFFICIENT).unwrap();
buffer.extend_from_slice(&f_i8_encoded);
let g_i8: Vec<i8> = g.coefficients.iter().map(|&a| a as i8).collect();
let g_i8: Vec<i8> = g
.coefficients
.iter()
.map(|&a| FalconFelt::new(a).balanced_value() as i8)
.collect();
let g_i8_encoded = encode_i8(&g_i8, WIDTH_SMALL_POLY_COEFFICIENT).unwrap();
buffer.extend_from_slice(&g_i8_encoded);
let big_f_i8: Vec<i8> = neg_big_f.coefficients.iter().map(|&a| -a as i8).collect();
let big_f_i8: Vec<i8> = neg_big_f
.coefficients
.iter()
.map(|&a| FalconFelt::new(-a).balanced_value() as i8)
.collect();
let big_f_i8_encoded = encode_i8(&big_f_i8, WIDTH_BIG_POLY_COEFFICIENT).unwrap();
buffer.extend_from_slice(&big_f_i8_encoded);
target.write_bytes(&buffer);