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Introduce a new utility function smemclr(), which memsets things to

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zero but does it in such a way that over-clever compilers hopefully
won't helpfully optimise the call away if you do it just before
freeing something or letting it go out of scope. Use this for
(hopefully) every memset whose job is to destroy sensitive data that
might otherwise be left lying around in the process's memory.

[originally from svn r9586]
This commit is contained in:
Simon Tatham
2012-07-22 19:51:50 +00:00
parent acf8a5385d
commit aa5bae8916
21 changed files with 140 additions and 89 deletions
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8
sshdss.c
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@ -20,7 +20,7 @@ static void sha_mpint(SHA_State * s, Bignum b)
lenbuf[0] = bignum_byte(b, len);
SHA_Bytes(s, lenbuf, 1);
}
memset(lenbuf, 0, sizeof(lenbuf));
smemclr(lenbuf, sizeof(lenbuf));
}
static void sha512_mpint(SHA512_State * s, Bignum b)
@ -34,7 +34,7 @@ static void sha512_mpint(SHA512_State * s, Bignum b)
lenbuf[0] = bignum_byte(b, len);
SHA512_Bytes(s, lenbuf, 1);
}
memset(lenbuf, 0, sizeof(lenbuf));
smemclr(lenbuf, sizeof(lenbuf));
}
static void getstring(char **data, int *datalen, char **p, int *length)
@ -575,7 +575,7 @@ static unsigned char *dss_sign(void *key, char *data, int datalen, int *siglen)
SHA512_Bytes(&ss, digest, sizeof(digest));
SHA512_Final(&ss, digest512);
memset(&ss, 0, sizeof(ss));
smemclr(&ss, sizeof(ss));
/*
* Now convert the result into a bignum, and reduce it mod q.
@ -584,7 +584,7 @@ static unsigned char *dss_sign(void *key, char *data, int datalen, int *siglen)
k = bigmod(proto_k, dss->q);
freebn(proto_k);
memset(digest512, 0, sizeof(digest512));
smemclr(digest512, sizeof(digest512));
/*
* Now we have k, so just go ahead and compute the signature.