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f667820c16
This commit implements coordinate blinding, i.e., it randomizes the representative of an elliptic curve point in its equivalence class, for prime curves implemented through EC_GFp_simple_method, EC_GFp_mont_method, and EC_GFp_nist_method. This commit is derived from the patch https://marc.info/?l=openssl-dev&m=131194808413635 by Billy Brumley. Coordinate blinding is a generally useful side-channel countermeasure and is (mostly) free. The function itself takes a few field multiplicationss, but is usually only necessary at the beginning of a scalar multiplication (as implemented in the patch). When used this way, it makes the values that variables take (i.e., field elements in an algorithm state) unpredictable. For instance, this mitigates chosen EC point side-channel attacks for settings such as ECDH and EC private key decryption, for the aforementioned curves. For EC_METHODs using different coordinate representations this commit does nothing, but the corresponding coordinate blinding function can be easily added in the future to extend these changes to such curves. Co-authored-by: Nicola Tuveri <nic.tuv@gmail.com> Co-authored-by: Billy Brumley <bbrumley@gmail.com> Reviewed-by: Andy Polyakov <appro@openssl.org> Reviewed-by: Matt Caswell <matt@openssl.org> (Merged from https://github.com/openssl/openssl/pull/6501) |
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| .. | ||
| asm | ||
| curve448 | ||
| build.info | ||
| curve25519.c | ||
| ec2_oct.c | ||
| ec2_smpl.c | ||
| ec_ameth.c | ||
| ec_asn1.c | ||
| ec_check.c | ||
| ec_curve.c | ||
| ec_cvt.c | ||
| ec_err.c | ||
| ec_key.c | ||
| ec_kmeth.c | ||
| ec_lcl.h | ||
| ec_lib.c | ||
| ec_mult.c | ||
| ec_oct.c | ||
| ec_pmeth.c | ||
| ec_print.c | ||
| ecdh_kdf.c | ||
| ecdh_ossl.c | ||
| ecdsa_ossl.c | ||
| ecdsa_sign.c | ||
| ecdsa_vrf.c | ||
| eck_prn.c | ||
| ecp_mont.c | ||
| ecp_nist.c | ||
| ecp_nistp224.c | ||
| ecp_nistp256.c | ||
| ecp_nistp521.c | ||
| ecp_nistputil.c | ||
| ecp_nistz256_table.c | ||
| ecp_nistz256.c | ||
| ecp_oct.c | ||
| ecp_smpl.c | ||
| ecx_meth.c | ||