| /* This Source Code Form is subject to the terms of the Mozilla Public |
| * License, v. 2.0. If a copy of the MPL was not distributed with this |
| * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ |
| |
| /* curve 25519 https://www.rfc-editor.org/rfc/rfc7748.txt */ |
| |
| #ifdef FREEBL_NO_DEPEND |
| #include "../stubs.h" |
| #endif |
| |
| #include "ecl-priv.h" |
| #include "ecp.h" |
| #include "mpi.h" |
| #include "mplogic.h" |
| #include "mpi-priv.h" |
| #include "secmpi.h" |
| #include "secitem.h" |
| #include "secport.h" |
| #include <stdlib.h> |
| #include <stdio.h> |
| |
| /* |
| * point validation is not necessary in general. But this checks a point (px) |
| * against some known bad values. |
| */ |
| SECStatus |
| ec_Curve25519_pt_validate(const SECItem *px) |
| { |
| PRUint8 *p; |
| int i; |
| PRUint8 forbiddenValues[12][32] = { |
| { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, |
| 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, |
| 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, |
| 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 }, |
| { 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, |
| 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, |
| 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, |
| 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 }, |
| { 0xe0, 0xeb, 0x7a, 0x7c, 0x3b, 0x41, 0xb8, 0xae, |
| 0x16, 0x56, 0xe3, 0xfa, 0xf1, 0x9f, 0xc4, 0x6a, |
| 0xda, 0x09, 0x8d, 0xeb, 0x9c, 0x32, 0xb1, 0xfd, |
| 0x86, 0x62, 0x05, 0x16, 0x5f, 0x49, 0xb8, 0x00 }, |
| { 0x5f, 0x9c, 0x95, 0xbc, 0xa3, 0x50, 0x8c, 0x24, |
| 0xb1, 0xd0, 0xb1, 0x55, 0x9c, 0x83, 0xef, 0x5b, |
| 0x04, 0x44, 0x5c, 0xc4, 0x58, 0x1c, 0x8e, 0x86, |
| 0xd8, 0x22, 0x4e, 0xdd, 0xd0, 0x9f, 0x11, 0x57 }, |
| { 0xec, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, |
| 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, |
| 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, |
| 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x7f }, |
| { 0xed, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, |
| 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, |
| 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, |
| 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x7f }, |
| { 0xee, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, |
| 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, |
| 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, |
| 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x7f }, |
| { 0xcd, 0xeb, 0x7a, 0x7c, 0x3b, 0x41, 0xb8, 0xae, |
| 0x16, 0x56, 0xe3, 0xfa, 0xf1, 0x9f, 0xc4, 0x6a, |
| 0xda, 0x09, 0x8d, 0xeb, 0x9c, 0x32, 0xb1, 0xfd, |
| 0x86, 0x62, 0x05, 0x16, 0x5f, 0x49, 0xb8, 0x80 }, |
| { 0x4c, 0x9c, 0x95, 0xbc, 0xa3, 0x50, 0x8c, 0x24, |
| 0xb1, 0xd0, 0xb1, 0x55, 0x9c, 0x83, 0xef, 0x5b, |
| 0x04, 0x44, 0x5c, 0xc4, 0x58, 0x1c, 0x8e, 0x86, |
| 0xd8, 0x22, 0x4e, 0xdd, 0xd0, 0x9f, 0x11, 0xd7 }, |
| { 0xd9, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, |
| 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, |
| 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, |
| 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff }, |
| { 0xda, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, |
| 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, |
| 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, |
| 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff }, |
| { 0xdb, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, |
| 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, |
| 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, |
| 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff }, |
| }; |
| |
| if (px->len == 32) { |
| p = px->data; |
| } else { |
| return SECFailure; |
| } |
| |
| for (i = 0; i < PR_ARRAY_SIZE(forbiddenValues); ++i) { |
| if (NSS_SecureMemcmp(p, forbiddenValues[i], px->len) == 0) { |
| return SECFailure; |
| } |
| } |
| |
| return SECSuccess; |
| } |
| |
| /* |
| * Scalar multiplication for Curve25519. |
| * If P == NULL, the base point is used. |
| * Returns X = k*P |
| */ |
| SECStatus |
| ec_Curve25519_pt_mul(SECItem *X, SECItem *k, SECItem *P) |
| { |
| PRUint8 *px; |
| PRUint8 basePoint[32] = { 9 }; |
| |
| if (!P) { |
| px = basePoint; |
| } else { |
| PORT_Assert(P->len == 32); |
| if (P->len != 32) { |
| return SECFailure; |
| } |
| px = P->data; |
| } |
| |
| SECStatus rv = ec_Curve25519_mul(X->data, k->data, px); |
| if (NSS_SecureMemcmpZero(X->data, X->len) == 0) { |
| return SECFailure; |
| } |
| return rv; |
| } |