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Manuel Pégourié-Gonnard 2adb375c50 Add option to avoid 64-bit multiplication 
Motivation is similar to NO_UDBL_DIVISION.

The alternative implementation of 64-bit mult is straightforward and aims at
obvious correctness. Also, visual examination of the generate assembly show
that it's quite efficient with clang, armcc5 and arm-clang. However current
GCC generates fairly inefficient code for it.

I tried to rework the code in order to make GCC generate more efficient code.
Unfortunately the only way to do that is to get rid of 64-bit add and handle
the carry manually, but this causes other compilers to generate less efficient
code with branches, which is not acceptable from a side-channel point of view.

So let's keep the obvious code that works for most compilers and hope future
versions of GCC learn to manage registers in a sensible way in that context.

See https://bugs.launchpad.net/gcc-arm-embedded/+bug/1775263
2018-06-07 11:05:33 +02:00
..
.gitignore Split libs with make + general make cleanups 2015-06-25 10:59:56 +02:00
aes.c Rename mbedtls_zeroize to mbedtls_platform_zeroize 2018-04-17 10:00:21 -05:00
aesni.c Warn if using a memory sanitizer on AESNI 2018-04-05 15:37:38 +02:00
arc4.c Rename mbedtls_zeroize to mbedtls_platform_zeroize 2018-04-17 10:00:21 -05:00
asn1parse.c Rename mbedtls_zeroize to mbedtls_platform_zeroize 2018-04-17 10:00:21 -05:00
asn1write.c Fix minor code style issues 2018-05-15 09:21:57 +01:00
base64.c Add comment to integer overflow fix in base64.c 2017-02-15 23:31:07 +02:00
bignum.c Merge remote-tracking branch 'upstream-restricted/pr/421' into development-proposed 2018-05-04 14:39:24 +01:00
blowfish.c Rename mbedtls_zeroize to mbedtls_platform_zeroize 2018-04-17 10:00:21 -05:00
camellia.c Rename mbedtls_zeroize to mbedtls_platform_zeroize 2018-04-17 10:00:21 -05:00
ccm.c Rename mbedtls_zeroize to mbedtls_platform_zeroize 2018-04-17 10:00:21 -05:00
certs.c Undo API change from SHA1 deprecation 2017-07-27 21:44:33 +01:00
chacha20.c Misc style adjustments 2018-05-24 18:50:18 +02:00
chachapoly.c chachapoly: force correct mode for integrated API 2018-06-04 12:18:19 +02:00
cipher.c chachapoly: force correct mode for integrated API 2018-06-04 12:18:19 +02:00
cipher_wrap.c cipher: handle ChaCha20 as a stream cipher 2018-05-24 13:37:31 +02:00
cmac.c Rename mbedtls_zeroize to mbedtls_platform_zeroize 2018-04-17 10:00:21 -05:00
CMakeLists.txt Rename aead_chacha20_poly1305 to chachapoly 2018-05-24 13:37:31 +02:00
ctr_drbg.c Rename mbedtls_zeroize to mbedtls_platform_zeroize 2018-04-17 10:00:21 -05:00
debug.c Fix compilation error with Mingw32 2017-09-06 17:51:14 +03:00
des.c Rename mbedtls_zeroize to mbedtls_platform_zeroize 2018-04-17 10:00:21 -05:00
dhm.c Rename mbedtls_zeroize to mbedtls_platform_zeroize 2018-04-17 10:00:21 -05:00
ecdh.c Address PR cpomments reviews 2017-10-10 19:04:27 +03:00
ecdsa.c Clarify the use of MBEDTLS_ERR_PK_SIG_LEN_MISMATCH 2018-03-30 18:43:16 +02:00
ecjpake.c Fix minor code style issues 2018-05-15 09:21:57 +01:00
ecp.c Rename mbedtls_zeroize to mbedtls_platform_zeroize 2018-04-17 10:00:21 -05:00
ecp_curves.c Merge branch 'pr_348' into development-proposed 2018-04-04 09:18:27 +02:00
entropy.c Rename mbedtls_zeroize to mbedtls_platform_zeroize 2018-04-17 10:00:21 -05:00
entropy_poll.c Added checking for QNX operating system to make mbedtls build on QNX 2016-08-18 07:55:05 +02:00
error.c Add some error codes and merge others 2018-05-24 13:37:31 +02:00
gcm.c Rename mbedtls_zeroize to mbedtls_platform_zeroize 2018-04-17 10:00:21 -05:00
havege.c Rename mbedtls_zeroize to mbedtls_platform_zeroize 2018-04-17 10:00:21 -05:00
hmac_drbg.c Rename mbedtls_zeroize to mbedtls_platform_zeroize 2018-04-17 10:00:21 -05:00
Makefile Rename aead_chacha20_poly1305 to chachapoly 2018-05-24 13:37:31 +02:00
md.c Rename mbedtls_zeroize to mbedtls_platform_zeroize 2018-04-17 10:00:21 -05:00
md2.c Rename mbedtls_zeroize to mbedtls_platform_zeroize 2018-04-17 10:00:21 -05:00
md4.c Rename mbedtls_zeroize to mbedtls_platform_zeroize 2018-04-17 10:00:21 -05:00
md5.c Rename mbedtls_zeroize to mbedtls_platform_zeroize 2018-04-17 10:00:21 -05:00
md_wrap.c New MD API: rename functions from _ext to _ret 2018-01-22 11:54:42 +01:00
memory_buffer_alloc.c Rename mbedtls_zeroize to mbedtls_platform_zeroize 2018-04-17 10:00:21 -05:00
net_sockets.c Make the memset call prior to FD_ZERO conditional to needing it 2018-04-05 14:55:47 +02:00
oid.c pkcs5v2: add support for additional hmacSHA algorithms 2018-02-08 17:18:15 +08:00
padlock.c Change main license to Apache 2.0 2015-09-04 14:21:07 +02:00
pem.c Rename mbedtls_zeroize to mbedtls_platform_zeroize 2018-04-17 10:00:21 -05:00
pk.c Rename mbedtls_zeroize to mbedtls_platform_zeroize 2018-04-17 10:00:21 -05:00
pk_wrap.c Rename mbedtls_zeroize to mbedtls_platform_zeroize 2018-04-17 10:00:21 -05:00
pkcs5.c Fix coding style in pkcs5.c preprocessor directives 2018-03-27 20:53:12 +01:00
pkcs11.c Change main license to Apache 2.0 2015-09-04 14:21:07 +02:00
pkcs12.c Rename mbedtls_zeroize to mbedtls_platform_zeroize 2018-04-17 10:00:21 -05:00
pkparse.c Rename mbedtls_zeroize to mbedtls_platform_zeroize 2018-04-17 10:00:21 -05:00
pkwrite.c Adapt PK test suite to use new interface 2017-08-23 16:17:27 +01:00
platform.c Rename mbedtls_zeroize to mbedtls_platform_zeroize 2018-04-17 10:00:21 -05:00
platform_util.c Rename mbedtls_zeroize to mbedtls_platform_zeroize 2018-04-17 10:00:21 -05:00
poly1305.c Add option to avoid 64-bit multiplication 2018-06-07 11:05:33 +02:00
ripemd160.c Rename mbedtls_zeroize to mbedtls_platform_zeroize 2018-04-17 10:00:21 -05:00
rsa.c Merge remote-tracking branch 'upstream-restricted/pr/421' into development-proposed 2018-05-04 14:39:24 +01:00
rsa_internal.c Add explicit type cast to avoid truncation warning 2018-01-03 09:27:40 +00:00
sha1.c Rename mbedtls_zeroize to mbedtls_platform_zeroize 2018-04-17 10:00:21 -05:00
sha256.c Rename mbedtls_zeroize to mbedtls_platform_zeroize 2018-04-17 10:00:21 -05:00
sha512.c Rename mbedtls_zeroize to mbedtls_platform_zeroize 2018-04-17 10:00:21 -05:00
ssl_cache.c Address PR review comments 2017-10-29 17:53:52 +02:00
ssl_ciphersuites.c Undo API change 2017-07-27 21:44:33 +01:00
ssl_cli.c Fix minor code style issues 2018-05-15 09:21:57 +01:00
ssl_cookie.c Rename mbedtls_zeroize to mbedtls_platform_zeroize 2018-04-17 10:00:21 -05:00
ssl_srv.c Remove preprocessor directives around platform_util.h include 2018-04-24 08:40:46 -05:00
ssl_ticket.c Rename mbedtls_zeroize to mbedtls_platform_zeroize 2018-04-17 10:00:21 -05:00
ssl_tls.c Fix minor code style issues 2018-05-15 09:21:57 +01:00
threading.c Do not define and initialize global mutexes on configurations that do not use them. 2018-03-21 15:01:55 +00:00
timing.c Merge remote-tracking branch 'upstream-public/pr/572' into development-proposed 2018-03-27 16:42:20 +01:00
version.c Fix missing void argument declarations #678 2016-11-04 23:05:56 +01:00
version_features.c Add option to avoid 64-bit multiplication 2018-06-07 11:05:33 +02:00
x509.c Correctly handle leap year in x509_date_is_valid() 2017-10-12 23:21:37 +01:00
x509_create.c Fix other occurrences of same bounds check issue 2015-10-21 12:50:45 +02:00
x509_crl.c Rename mbedtls_zeroize to mbedtls_platform_zeroize 2018-04-17 10:00:21 -05:00
x509_crt.c Fix minor code style issues 2018-05-15 09:21:57 +01:00
x509_csr.c Rename mbedtls_zeroize to mbedtls_platform_zeroize 2018-04-17 10:00:21 -05:00
x509write_crt.c Rename mbedtls_zeroize to mbedtls_platform_zeroize 2018-04-17 10:00:21 -05:00
x509write_csr.c Rename mbedtls_zeroize to mbedtls_platform_zeroize 2018-04-17 10:00:21 -05:00
xtea.c Rename mbedtls_zeroize to mbedtls_platform_zeroize 2018-04-17 10:00:21 -05:00