diff options
Diffstat (limited to '')
| -rw-r--r-- | security/nss/lib/freebl/ecl/ecp_25519.c | 145 |
1 files changed, 145 insertions, 0 deletions
diff --git a/security/nss/lib/freebl/ecl/ecp_25519.c b/security/nss/lib/freebl/ecl/ecp_25519.c new file mode 100644 index 0000000000..a417068e1c --- /dev/null +++ b/security/nss/lib/freebl/ecl/ecp_25519.c @@ -0,0 +1,145 @@ +/* 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 "secerr.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; + PRUint64 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 validation is not necessary. + */ +SECStatus +ec_Curve25519_scalar_validate(const SECItem *scalar) +{ + if (!scalar || !scalar->data) { + PORT_SetError(SEC_ERROR_INVALID_ARGS); + return SECFailure; + } + + if (scalar->len != 32) { + PORT_SetError(SEC_ERROR_BAD_KEY); + 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; + } + if (k->len != 32) { + return SECFailure; + } + + SECStatus rv = ec_Curve25519_mul(X->data, k->data, px); + if (NSS_SecureMemcmpZero(X->data, X->len) == 0) { + return SECFailure; + } + return rv; +} |