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/* P-256 from HACL* */
#ifdef FREEBL_NO_DEPEND
#include "../stubs.h"
#endif
#include "ecl-priv.h"
#include "secitem.h"
#include "secerr.h"
#include "secmpi.h"
#include "../verified/Hacl_P256.h"
/*
* Point Validation for P-256.
*/
SECStatus
ec_secp256r1_pt_validate(const SECItem *pt)
{
SECStatus res = SECSuccess;
if (!pt || !pt->data) {
PORT_SetError(SEC_ERROR_INVALID_ARGS);
res = SECFailure;
return res;
}
if (pt->len != 65) {
PORT_SetError(SEC_ERROR_BAD_KEY);
res = SECFailure;
return res;
}
if (pt->data[0] != EC_POINT_FORM_UNCOMPRESSED) {
PORT_SetError(SEC_ERROR_UNSUPPORTED_EC_POINT_FORM);
res = SECFailure;
return res;
}
bool b = Hacl_P256_validate_public_key(pt->data + 1);
if (!b) {
PORT_SetError(SEC_ERROR_BAD_KEY);
res = SECFailure;
}
return res;
}
/*
* Scalar Validation for P-256.
*/
SECStatus
ec_secp256r1_scalar_validate(const SECItem *scalar)
{
SECStatus res = SECSuccess;
if (!scalar || !scalar->data) {
PORT_SetError(SEC_ERROR_INVALID_ARGS);
res = SECFailure;
return res;
}
if (scalar->len != 32) {
PORT_SetError(SEC_ERROR_BAD_KEY);
res = SECFailure;
return res;
}
bool b = Hacl_P256_validate_private_key(scalar->data);
if (!b) {
PORT_SetError(SEC_ERROR_BAD_KEY);
res = SECFailure;
}
return res;
}
/*
* Scalar multiplication for P-256.
* If P == NULL, the base point is used.
* Returns X = k*P
*/
SECStatus
ec_secp256r1_pt_mul(SECItem *X, SECItem *k, SECItem *P)
{
SECStatus res = SECSuccess;
if (!P) {
uint8_t derived[64] = { 0 };
if (!X || !k || !X->data || !k->data ||
X->len < 65 || k->len != 32) {
PORT_SetError(SEC_ERROR_INVALID_ARGS);
res = SECFailure;
return res;
}
bool b = Hacl_P256_dh_initiator(derived, k->data);
if (!b) {
PORT_SetError(SEC_ERROR_BAD_KEY);
res = SECFailure;
return res;
}
X->len = 65;
X->data[0] = EC_POINT_FORM_UNCOMPRESSED;
memcpy(X->data + 1, derived, 64);
} else {
uint8_t full_key[32] = { 0 };
uint8_t *key;
uint8_t derived[64] = { 0 };
if (!X || !k || !P || !X->data || !k->data || !P->data ||
X->len < 32 || P->len != 65 ||
P->data[0] != EC_POINT_FORM_UNCOMPRESSED) {
PORT_SetError(SEC_ERROR_INVALID_ARGS);
res = SECFailure;
return res;
}
/* We consider keys of up to size 32, or of size 33 with a single leading 0 */
if (k->len < 32) {
memcpy(full_key + 32 - k->len, k->data, k->len);
key = full_key;
} else if (k->len == 32) {
key = k->data;
} else if (k->len == 33 && k->data[0] == 0) {
key = k->data + 1;
} else {
PORT_SetError(SEC_ERROR_INVALID_ARGS);
res = SECFailure;
return res;
}
bool b = Hacl_P256_dh_responder(derived, P->data + 1, key);
if (!b) {
PORT_SetError(SEC_ERROR_BAD_KEY);
res = SECFailure;
return res;
}
X->len = 32;
memcpy(X->data, derived, 32);
}
return res;
}
/*
* ECDSA Signature for P-256
*/
SECStatus
ec_secp256r1_sign_digest(ECPrivateKey *key, SECItem *signature,
const SECItem *digest, const unsigned char *kb,
const unsigned int kblen)
{
SECStatus res = SECSuccess;
if (!key || !signature || !digest || !kb ||
!key->privateValue.data ||
!signature->data || !digest->data ||
key->ecParams.name != ECCurve_NIST_P256) {
PORT_SetError(SEC_ERROR_INVALID_ARGS);
res = SECFailure;
return res;
}
if (key->privateValue.len != 32 ||
kblen == 0 ||
digest->len == 0 ||
signature->len < 64) {
PORT_SetError(SEC_ERROR_INPUT_LEN);
res = SECFailure;
return res;
}
uint8_t hash[32] = { 0 };
if (digest->len < 32) {
memcpy(hash + 32 - digest->len, digest->data, digest->len);
} else {
memcpy(hash, digest->data, 32);
}
uint8_t nonce[32] = { 0 };
if (kblen < 32) {
memcpy(nonce + 32 - kblen, kb, kblen);
} else {
memcpy(nonce, kb, 32);
}
bool b = Hacl_P256_ecdsa_sign_p256_without_hash(
signature->data, 32, hash,
key->privateValue.data, nonce);
if (!b) {
PORT_SetError(SEC_ERROR_BAD_KEY);
res = SECFailure;
return res;
}
signature->len = 64;
return res;
}
/*
* ECDSA Signature Verification for P-256
*/
SECStatus
ec_secp256r1_verify_digest(ECPublicKey *key, const SECItem *signature,
const SECItem *digest)
{
SECStatus res = SECSuccess;
if (!key || !signature || !digest ||
!key->publicValue.data ||
!signature->data || !digest->data ||
key->ecParams.name != ECCurve_NIST_P256) {
PORT_SetError(SEC_ERROR_INVALID_ARGS);
res = SECFailure;
return res;
}
if (key->publicValue.len != 65 ||
digest->len == 0 ||
signature->len != 64) {
PORT_SetError(SEC_ERROR_INPUT_LEN);
res = SECFailure;
return res;
}
if (key->publicValue.data[0] != EC_POINT_FORM_UNCOMPRESSED) {
PORT_SetError(SEC_ERROR_UNSUPPORTED_EC_POINT_FORM);
res = SECFailure;
return res;
}
uint8_t hash[32] = { 0 };
if (digest->len < 32) {
memcpy(hash + 32 - digest->len, digest->data, digest->len);
} else {
memcpy(hash, digest->data, 32);
}
bool b = Hacl_P256_ecdsa_verif_without_hash(
32, hash,
key->publicValue.data + 1,
signature->data, signature->data + 32);
if (!b) {
PORT_SetError(SEC_ERROR_BAD_SIGNATURE);
res = SECFailure;
return res;
}
return res;
}
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