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avoid potential infinite loop in final reduction round of BN_GF2m_mod_arr()

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Submitted by: Huang Ying
Reviewed by: Douglas Stebila
This commit is contained in:
Bodo Möller 2008-06-23 20:46:24 +00:00
parent 869eb9e767
commit 8228fd89fc
2 changed files with 10 additions and 2 deletions
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6
CHANGES
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@ -702,12 +702,16 @@
Changes between 0.9.8h and 0.9.8i [xx XXX xxxx] Changes between 0.9.8h and 0.9.8i [xx XXX xxxx]
*) Fix BN_GF2m_mod_arr() top-bit cleanup code.
[Huang Ying]
*) Expand ENGINE to support engine supplied SSL client certificate functions. *) Expand ENGINE to support engine supplied SSL client certificate functions.
This work was sponsored by Logica. This work was sponsored by Logica.
[Steve Henson] [Steve Henson]
*) Add CryptoAPI ENGINE to support use of RSA and DSA keys held in Windows keystores. Support for SSL/TLS client authentication too. *) Add CryptoAPI ENGINE to support use of RSA and DSA keys held in Windows
keystores. Support for SSL/TLS client authentication too.
Not compiled unless enable-capieng specified to Configure. Not compiled unless enable-capieng specified to Configure.
This work was sponsored by Logica. This work was sponsored by Logica.

6
crypto/bn/bn_gf2m.c
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@ -322,7 +322,11 @@ int BN_GF2m_mod_arr(BIGNUM *r, const BIGNUM *a, const int p[])
if (zz == 0) break; if (zz == 0) break;
d1 = BN_BITS2 - d0; d1 = BN_BITS2 - d0;
if (d0) z[dN] = (z[dN] << d1) >> d1; /* clear up the top d1 bits */ /* clear up the top d1 bits */
if (d0)
z[dN] = (z[dN] << d1) >> d1;
else
z[dN] = 0;
z[0] ^= zz; /* reduction t^0 component */ z[0] ^= zz; /* reduction t^0 component */
for (k = 1; p[k] != 0; k++) for (k = 1; p[k] != 0; k++)