mbedtls/library
Manuel Pégourié-Gonnard f2268d1c17 Reject low-order points on Curve25519 early
We were already rejecting them at the end, due to the fact that with the
usual (x, z) formulas they lead to the result (0, 0) so when we want to
normalize at the end, trying to compute the modular inverse of z will
give an error.

If we wanted to support those points, we'd a special case in
ecp_normalize_mxz(). But it's actually permitted by all sources
(RFC 7748 say we MAY reject 0 as a result) and recommended by some to
reject those points (either to ensure contributory behaviour, or to
protect against timing attack when the underlying field arithmetic is
not constant-time).

Since our field arithmetic is indeed not constant-time, let's reject
those points before they get mixed with sensitive data (in
ecp_mul_mxz()), in order to avoid exploitable leaks caused by the
special cases they would trigger. (See the "May the Fourth" paper
https://eprint.iacr.org/2017/806.pdf)

Signed-off-by: Manuel Pégourié-Gonnard <manuel.pegourie-gonnard@arm.com>
2021-06-25 14:06:45 +01:00
..
.gitignore
aes.c
aesni.c
arc4.c
aria.c ARIA: add missing context init/free 2021-05-25 18:45:04 +02:00
asn1parse.c
asn1write.c
base64.c Code style fixups 2021-03-04 14:34:50 +00:00
bignum.c Homogenize coding patterns 2021-06-17 16:39:47 +02:00
blowfish.c
camellia.c CAMELLIA: add missing context init/free 2021-05-25 18:45:04 +02:00
ccm.c
certs.c
chacha20.c
chachapoly.c
check_crypto_config.h psa: config: Add CAMELLIA to the list of possible CMAC ciphers 2021-03-25 14:25:46 +01:00
cipher_wrap.c
cipher.c
cmac.c Allow skipping 3DES in CMAC self-test when ALT implemented 2021-04-30 10:09:52 +02:00
CMakeLists.txt Add boilerplate for dispatching MAC operations 2021-05-11 18:56:01 +02:00
common.h Move MBEDTLS_ERR_ADD macro and functions to error.* 2021-04-13 15:21:43 +01:00
ctr_drbg.c
debug.c Declare mbedtls_debug_print_msg as printf-like 2021-03-10 17:00:32 +00:00
des.c
dhm.c DHM: add notes about leading zeros 2021-06-02 21:39:31 +02:00
ecdh.c
ecdsa.c avoid "maybe-uninitialized" and "free-nonheap-object" errors/warnings with gcc11 2021-05-12 09:37:00 -04:00
ecjpake.c ecjpake_zkp_read() now returns ...BAD_INPUT_DATA when r len == 0 and test follows that 2021-03-17 11:36:31 +01:00
ecp_curves.c Fix low-probability arithmetic error in ECC 2021-04-04 01:10:41 +02:00
ecp_invasive.h Move mbedtls_mpi_random to the bignum module 2021-06-02 21:31:24 +02:00
ecp.c Reject low-order points on Curve25519 early 2021-06-25 14:06:45 +01:00
entropy_poll.c
entropy.c Merge pull request #3616 from militant-daos/bug_3175 2021-03-30 17:33:08 +02:00
error.c Revert "Remove deprecated things from hashing modules" 2021-04-15 12:28:15 +02:00
gcm.c
havege.c
hkdf.c
hmac_drbg.c
Makefile Add boilerplate for dispatching MAC operations 2021-05-11 18:56:01 +02:00
md2.c Revert "Remove deprecated things from hashing modules" 2021-04-15 12:28:15 +02:00
md4.c Revert "Remove deprecated things from hashing modules" 2021-04-15 12:28:15 +02:00
md5.c Revert "Remove deprecated things from hashing modules" 2021-04-15 12:28:15 +02:00
md.c Revert "Remove deprecated things from hashing modules" 2021-04-15 12:28:15 +02:00
memory_buffer_alloc.c
mps_common.h Capitalise MPS trace macros 2021-04-07 12:45:35 +01:00
mps_error.h Fix Doxygen headers for MPS files 2021-03-29 14:20:18 +01:00
mps_reader.c Capitalise MPS trace macros 2021-04-07 12:45:35 +01:00
mps_reader.h Fix Doxygen headers for MPS files 2021-03-29 14:20:18 +01:00
mps_trace.c Capitalise MPS trace macros 2021-04-07 12:45:35 +01:00
mps_trace.h Capitalise MPS trace macros 2021-04-07 12:45:35 +01:00
net_sockets.c Fix fd range for select on Windows 2021-06-20 23:17:39 +02:00
nist_kw.c Fix null pointer arithmetic in error case 2021-06-01 11:57:18 +02:00
oid.c
padlock.c
pem.c Apply MBEDTLS_ERROR_ADD to library 2021-04-15 11:19:47 +01:00
pk_wrap.c
pk.c
pkcs5.c Apply MBEDTLS_ERROR_ADD to library 2021-04-15 11:19:47 +01:00
pkcs11.c
pkcs12.c Apply MBEDTLS_ERROR_ADD to library 2021-04-15 11:19:47 +01:00
pkparse.c Remove dead code from pk_parse_key_pkcs8_unencrypted_der 2021-04-28 14:12:07 +01:00
pkwrite.c
platform_util.c
platform.c
poly1305.c
psa_crypto_aead.c Update all uses of old AEAD output size macros 2021-04-15 17:32:06 +02:00
psa_crypto_aead.h psa: aead: Move AEAD driver entry points to psa_crypto_aead.c 2021-04-07 16:03:31 +02:00
psa_crypto_cipher.c psa: cipher: Remove cipher_generate_iv driver entry point 2021-03-26 15:58:25 +01:00
psa_crypto_cipher.h psa: cipher: Remove cipher_generate_iv driver entry point 2021-03-26 15:58:25 +01:00
psa_crypto_client.c
psa_crypto_core.h Merge pull request #4357 from gabor-mezei-arm/3267_Implement_psa_sign_message_and_verify 2021-05-17 10:14:46 +02:00
psa_crypto_driver_wrappers.c Fix missing compilation guard around psa_crypto_driver_wrappers.c 2021-05-19 21:03:46 +02:00
psa_crypto_driver_wrappers.h Merge pull request #4357 from gabor-mezei-arm/3267_Implement_psa_sign_message_and_verify 2021-05-17 10:14:46 +02:00
psa_crypto_ecp.c Move mbedtls_md_info_from_psa into the mbedtls hash driver 2021-03-15 12:14:40 +01:00
psa_crypto_ecp.h
psa_crypto_hash.c psa: hash: Fix is_hash_accelerated signature 2021-04-01 10:50:03 +02:00
psa_crypto_hash.h psa: include: Merge crypto_builtin_hash.h and crypto_builtin_cipher.h 2021-04-01 16:54:30 +02:00
psa_crypto_invasive.h Rework MAC algorithm / key type validation 2021-03-03 19:58:02 +01:00
psa_crypto_its.h
psa_crypto_mac.c Refactor out mac_sign_setup and mac_verify_setup 2021-05-11 18:56:01 +02:00
psa_crypto_mac.h Move is_sign and mac_size checking back to PSA core scope 2021-05-11 18:56:01 +02:00
psa_crypto_random_impl.h
psa_crypto_rsa.c psa: Support RSA signature without MBEDTLS_GENPRIME 2021-05-21 10:21:27 +01:00
psa_crypto_rsa.h
psa_crypto_se.c
psa_crypto_se.h
psa_crypto_service_integration.h
psa_crypto_slot_management.c Minor code flow improvements 2021-04-16 11:22:17 +02:00
psa_crypto_slot_management.h psa: Fix error code when creating/registering a key with invalid id 2021-04-01 14:05:41 +02:00
psa_crypto_storage.c
psa_crypto_storage.h
psa_crypto.c Fix missing state check for tls12_prf output 2021-06-14 18:08:26 +02:00
psa_its_file.c Correct fix for potential truncation 2021-03-10 17:00:32 +00:00
ripemd160.c Revert "Remove deprecated things from hashing modules" 2021-04-15 12:28:15 +02:00
rsa_internal.c
rsa.c Fix misc issues with unused parameters and check-names.sh 2021-04-13 15:26:59 +01:00
sha1.c Revert "Remove deprecated things from hashing modules" 2021-04-15 12:28:15 +02:00
sha256.c Revert "Remove deprecated things from hashing modules" 2021-04-15 12:28:15 +02:00
sha512.c Revert "Remove deprecated things from hashing modules" 2021-04-15 12:28:15 +02:00
ssl_cache.c Don't check ciphersuite and compression in SSL session cache lookup 2021-05-19 05:09:56 +01:00
ssl_ciphersuites.c Fix dependencies on SHA384 cipher suites 2021-05-19 16:58:08 +02:00
ssl_cli.c Enforce dhm_min_bitlen exactly, not just the byte size 2021-04-01 14:20:03 +02:00
ssl_cookie.c Improve documentation for error code checking 2021-04-22 15:28:56 +01:00
ssl_invasive.h
ssl_msg.c Fix misuse of MD API in SSL constant-flow HMAC 2021-05-19 10:40:02 +02:00
ssl_srv.c Don't check ciphersuite and compression in SSL session cache lookup 2021-05-19 05:09:56 +01:00
ssl_ticket.c
ssl_tls13_keys.c
ssl_tls13_keys.h
ssl_tls.c Merge pull request #4493 from netfoundry/gcc11.fixes_2.x 2021-05-20 15:54:20 +02:00
threading.c
timing.c
version_features.c Implement support for MBEDTLS_PSA_CRYPTO_BUILTIN_KEYS 2021-04-15 15:04:26 +02:00
version.c
x509_create.c
x509_crl.c Apply MBEDTLS_ERROR_ADD to library 2021-04-15 11:19:47 +01:00
x509_crt.c Apply MBEDTLS_ERROR_ADD to library 2021-04-15 11:19:47 +01:00
x509_csr.c Apply MBEDTLS_ERROR_ADD to library 2021-04-15 11:19:47 +01:00
x509.c Apply MBEDTLS_ERROR_ADD to library 2021-04-15 11:19:47 +01:00
x509write_crt.c avoid "maybe-uninitialized" and "free-nonheap-object" errors/warnings with gcc11 2021-05-12 09:37:00 -04:00
x509write_csr.c avoid "maybe-uninitialized" and "free-nonheap-object" errors/warnings with gcc11 2021-05-12 09:37:00 -04:00
xtea.c