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c-kzg-4844
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Add non-file-based load_trusted_setup 

Closes #3
This commit is contained in:
Ramana Kumar 2022-12-10 16:23:32 +00:00
parent 68f1d2dd7e
commit 547fd39e60
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GPG Key ID: ED471C788B900433
2 changed files with 37 additions and 24 deletions
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55
src/c_kzg_4844.c
View File

@ -770,39 +770,26 @@ static void bytes_from_bls_field(uint8_t out[32], const BLSFieldElement *in) {
blst_scalar_from_fr((blst_scalar*)out, in);
}
C_KZG_RET load_trusted_setup_file(KZGSettings *out, FILE *in) {
C_KZG_RET load_trusted_setup(KZGSettings *out, const uint8_t g1_bytes[], size_t n1, const uint8_t g2_bytes[], size_t n2) {
uint64_t i;
int j; uint8_t c[96];
blst_p2_affine g2_affine;
g1_t *g1_projective;
fscanf(in, "%" SCNu64, &i);
CHECK(i == FIELD_ELEMENTS_PER_BLOB);
fscanf(in, "%" SCNu64, &i);
CHECK(i == 65);
TRY(new_g1_array(&out->g1_values, n1));
TRY(new_g2_array(&out->g2_values, n2));
TRY(new_g1_array(&out->g1_values, FIELD_ELEMENTS_PER_BLOB));
TRY(new_g2_array(&out->g2_values, 65));
TRY(new_g1_array(&g1_projective, n1));
TRY(new_g1_array(&g1_projective, FIELD_ELEMENTS_PER_BLOB));
for (i = 0; i < n1; i++)
bytes_to_g1(&g1_projective[i], &g1_bytes[48 * i]);
for (i = 0; i < FIELD_ELEMENTS_PER_BLOB; i++) {
for (j = 0; j < 48; j++) {
fscanf(in, "%2hhx", &c[j]);
}
bytes_to_g1(&g1_projective[i], c);
}
for (i = 0; i < 65; i++) {
for (j = 0; j < 96; j++) {
fscanf(in, "%2hhx", &c[j]);
}
blst_p2_uncompress(&g2_affine, c);
for (i = 0; i < n2; i++) {
blst_p2_uncompress(&g2_affine, &g2_bytes[96 * i]);
blst_p2_from_affine(&out->g2_values[i], &g2_affine);
}
unsigned int max_scale = 0;
while (((uint64_t)1 << max_scale) < FIELD_ELEMENTS_PER_BLOB) max_scale++;
while (((uint64_t)1 << max_scale) < n1) max_scale++;
out->fs = (FFTSettings*)malloc(sizeof(FFTSettings));
if (out->fs == NULL) { free(g1_projective); return C_KZG_MALLOC; }
@ -811,15 +798,35 @@ C_KZG_RET load_trusted_setup_file(KZGSettings *out, FILE *in) {
ret = new_fft_settings((FFTSettings*)out->fs, max_scale);
if (ret != C_KZG_OK) { free(g1_projective); return ret; }
ret = fft_g1(out->g1_values, g1_projective, true, FIELD_ELEMENTS_PER_BLOB, out->fs);
ret = fft_g1(out->g1_values, g1_projective, true, n1, out->fs);
free(g1_projective);
if (ret != C_KZG_OK) return ret;
TRY(reverse_bit_order(out->g1_values, sizeof(g1_t), FIELD_ELEMENTS_PER_BLOB));
TRY(reverse_bit_order(out->g1_values, sizeof(g1_t), n1));
return C_KZG_OK;
}
C_KZG_RET load_trusted_setup_file(KZGSettings *out, FILE *in) {
uint64_t i;
fscanf(in, "%" SCNu64, &i);
CHECK(i == FIELD_ELEMENTS_PER_BLOB);
fscanf(in, "%" SCNu64, &i);
CHECK(i == 65);
uint8_t g1_bytes[FIELD_ELEMENTS_PER_BLOB * 48];
uint8_t g2_bytes[65 * 96];
for (i = 0; i < FIELD_ELEMENTS_PER_BLOB * 48; i++)
fscanf(in, "%2hhx", &g1_bytes[i]);
for (i = 0; i < 65 * 96; i++)
fscanf(in, "%2hhx", &g2_bytes[i]);
return load_trusted_setup(out, g1_bytes, FIELD_ELEMENTS_PER_BLOB, g2_bytes, 65);
}
void free_trusted_setup(KZGSettings *s) {
free_fft_settings((FFTSettings*)s->fs);
free_kzg_settings(s);

6
src/c_kzg_4844.h
View File

@ -91,6 +91,12 @@ void bytes_from_g1(uint8_t out[48], const g1_t *in);
void bytes_to_bls_field(BLSFieldElement *out, const uint8_t in[BYTES_PER_FIELD_ELEMENT]);
C_KZG_RET load_trusted_setup(KZGSettings *out,
const uint8_t g1_bytes[], /* n1 * 48 bytes */
size_t n1,
const uint8_t g2_bytes[], /* n2 * 96 bytes */
size_t n2);
C_KZG_RET load_trusted_setup_file(KZGSettings *out,
FILE *in);