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fb1b7e1db9
mbedtls/library
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Hanno Becker fb1b7e1db9 HMAC DRBG: Split entropy-gathering requests to reduce request sizes 
According to SP800-90A, the DRBG seeding process should use a nonce
of length `security_strength / 2` bits as part of the DRBG seed. It
further notes that this nonce may be drawn from the same source of
entropy that is used for the first `security_strength` bits of the
DRBG seed. The present HMAC DRBG implementation does that, requesting
`security_strength * 3 / 2` bits of entropy from the configured entropy
source in total to form the initial part of the DRBG seed.

However, some entropy sources may have thresholds in terms of how much
entropy they can provide in a single call to their entropy gathering
function which may be exceeded by the present HMAC DRBG implementation
even if the threshold is not smaller than `security_strength` bits.
Specifically, this is the case for our own entropy module implementation
which only allows requesting at most 32 Bytes of entropy at a time
in configurations disabling SHA-512, and this leads to runtime failure
of HMAC DRBG when used with Mbed Crypto' own entropy callbacks in such
configurations.

This commit fixes this by splitting the seed entropy acquisition into
two calls, one requesting `security_strength` bits first, and another
one requesting `security_strength / 2` bits for the nonce.

Fixes #237.
2019-08-30 12:16:06 +01:00
..
.gitignore
aes.c Add further missing brackets around macro parameters 2019-04-24 10:52:45 +02:00
aesni.c
arc4.c
aria.c Implement parameter validation for ARIA module 2018-12-19 12:51:00 +00:00
asn1parse.c
asn1write.c Fix ASN1 bitstring writing 2019-02-11 21:13:33 +00:00
base64.c
bignum.c Fix typo 2019-03-06 13:51:30 +00:00
blowfish.c Implement parameter validation for Blowfish module 2018-12-19 12:52:59 +00:00
camellia.c Minor improvements to Camellia module and documentation 2018-12-19 13:42:05 +00:00
ccm.c Improve macro hygiene 2019-04-24 10:51:54 +02:00
certs.c Update certificates to expire in 2029 2019-07-10 18:35:10 +03:00
chacha20.c Improve macro hygiene 2019-04-24 10:51:54 +02:00
chachapoly.c Fix wrong conditional in free() functions 2018-12-18 15:30:30 +00:00
cipher_wrap.c
cipher.c Remove unnecessary parameter validation from the Cipher module 2018-12-19 17:34:58 +01:00
cmac.c
CMakeLists.txt Update library to 2.16.2 2019-06-11 17:27:32 +01:00
ctr_drbg.c Streamline mbedtls_xxx_drbg_update_seed_file 2018-11-26 19:26:22 +01:00
debug.c Merge remote-tracking branch 'origin/pr/1818' into mbedtls-2.16 2019-03-05 16:28:18 +00:00
des.c Improve macro hygiene 2019-04-24 10:51:54 +02:00
dhm.c Allow DHM self test to run without MBEDTLS_PEM_PARSE_C 2019-05-30 10:58:12 +01:00
ecdh.c Fix mbedtls_ecdh_get_params with new ECDH context 2019-02-22 12:51:51 +01:00
ecdsa.c ECP restart: Don't calculate address of sub ctx if ctx is NULL 2019-07-19 14:25:42 +01:00
ecjpake.c Fix #2370, minor typos and spelling mistakes 2019-02-18 14:50:57 +00:00
ecp_curves.c Improve macro hygiene 2019-04-24 10:51:54 +02:00
ecp.c Improve macro hygiene 2019-04-24 10:51:54 +02:00
entropy_poll.c Add missing bracket 2018-11-06 13:12:47 +00:00
entropy.c
error.c Fix #2370, minor typos and spelling mistakes 2019-02-18 14:50:57 +00:00
gcm.c Improve parameter validation in mbedtls_gcm_free() 2018-12-19 17:32:19 +01:00
havege.c Prevent building the HAVEGE module on platforms where it doesn't work 2019-06-17 15:12:51 +02:00
hkdf.c
hmac_drbg.c HMAC DRBG: Split entropy-gathering requests to reduce request sizes 2019-08-30 12:16:06 +01:00
Makefile Fix #2370, minor typos and spelling mistakes 2019-02-18 14:50:57 +00:00
md2.c
md4.c Add more missing parentheses around macro parameters 2019-04-24 10:52:53 +02:00
md5.c Add further missing brackets around macro parameters 2019-04-24 10:52:45 +02:00
md_wrap.c
md.c
memory_buffer_alloc.c
net_sockets.c net_sockets: Fix typo in net_would_block() 2019-06-20 16:33:02 +01:00
nist_kw.c Remove faulty cipher_finish calls from nist_kw 2018-12-20 12:15:40 +01:00
oid.c Improve macro hygiene 2019-04-24 10:51:54 +02:00
padlock.c
pem.c
pk_wrap.c Fix or improve some comments (and whitespace) 2018-10-15 15:27:49 +02:00
pk.c Merge remote-tracking branch 'public/pr/1721' into development-restricted 2018-12-20 12:37:13 +00:00
pkcs5.c Guard mbedtls_pkcs5_pbes2() by MBEDTLS_ASN1_PARSE_C 2018-10-16 13:39:40 +01:00
pkcs11.c
pkcs12.c Make PBE-related parts of PKCS12 depend on MBEDTLS_ASN1_PARSE_C 2018-10-16 13:39:40 +01:00
pkparse.c pk_parse*keyfile: explicitly validate path=NULL 2018-12-19 17:37:02 +01:00
pkwrite.c PK parse/write: support keylen=0 correctly 2018-12-19 17:03:28 +01:00
platform_util.c Remove the library provided function of MBEDTLS_PARAM_FAILED 2018-12-11 12:28:56 +01:00
platform.c Omit runtime configuration of calloc/free if macro config enabled 2018-10-11 11:04:20 +01:00
poly1305.c Improve macro hygiene 2019-04-24 10:51:54 +02:00
ripemd160.c Improve macro hygiene 2019-04-24 10:51:54 +02:00
rsa_internal.c Bignum: Deprecate mbedtls_mpi_is_prime() 2018-10-09 16:36:53 +01:00
rsa.c Merge remote-tracking branch 'public/pr/1721' into development-restricted 2018-12-20 12:37:13 +00:00
sha1.c Add further missing brackets around macro parameters 2019-04-24 10:52:45 +02:00
sha256.c Add further missing brackets around macro parameters 2019-04-24 10:52:45 +02:00
sha512.c Add more missing parentheses around macro parameters 2019-04-24 10:52:53 +02:00
ssl_cache.c
ssl_ciphersuites.c Reduce priority of 3DES ciphersuites 2019-03-01 10:29:13 +01:00
ssl_cli.c SSL: Make use of the new ECDH interface 2018-12-06 12:22:46 +00:00
ssl_cookie.c
ssl_srv.c Fix #2370, minor typos and spelling mistakes 2019-02-18 14:50:57 +00:00
ssl_ticket.c Indentation fix 2018-10-25 16:07:16 +01:00
ssl_tls.c Merge remote-tracking branch 'origin/pr/2714' into mbedtls-2.16 2019-06-21 16:00:52 +01:00
threading.c Don't declare and define gmtime()-mutex on Windows platforms 2018-09-06 12:09:56 +01:00
timing.c timing: Remove redundant include file 2019-06-20 16:33:02 +01:00
version_features.c Make it easier to define MBEDTLS_PARAM_FAILED as assert 2019-06-17 19:07:42 +02:00
version.c
x509_create.c Break overly long line in library/x509_create.c 2018-11-02 10:52:38 +00:00
x509_crl.c Always return a high-level error code from X.509 module 2019-06-04 14:01:10 +01:00
x509_crt.c Merge remote-tracking branch 'origin/pr/2450' into mbedtls-2.16 2019-06-21 15:59:29 +01:00
x509_csr.c Fix CSR parsing header call 2018-10-07 17:48:37 +01:00
x509.c Merge remote-tracking branch 'origin/pr/2450' into mbedtls-2.16 2019-06-21 15:59:29 +01:00
x509write_crt.c Fix ASN1 bitstring writing 2019-02-11 21:13:33 +00:00
x509write_csr.c Fix ASN1 bitstring writing 2019-02-11 21:13:33 +00:00
xtea.c