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check CRT

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This commit is contained in:
Ulf Möller 2001-03-28 04:56:58 +00:00
parent 6d864b7030
commit 6a5b52efa0
2 changed files with 18 additions and 2 deletions
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6
CHANGES
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@ -4,6 +4,12 @@
Changes between 0.9.6 and 0.9.7 [xx XXX 2000]
*) Check the result of RSA-CRT (see D. Boneh, R. DeMillo, R. Lipton:
On the Importance of Eliminating Errors in Cryptographic
Computations, J. Cryptology 14 (2001) 2, 101-119,
http://theory.stanford.edu/~dabo/papers/faults.ps.gz).
[Ulf Moeller]
*) MIPS assembler BIGNUM division bug fix.
[Andy Polyakov]

12
crypto/rsa/rsa_eay.c
View File

@ -453,7 +453,7 @@ err:
static int RSA_eay_mod_exp(BIGNUM *r0, const BIGNUM *I, RSA *rsa)
{
const RSA_METHOD *meth;
BIGNUM r1,m1;
BIGNUM r1,m1,vrfy;
int ret=0;
BN_CTX *ctx;
@ -461,6 +461,7 @@ static int RSA_eay_mod_exp(BIGNUM *r0, const BIGNUM *I, RSA *rsa)
if ((ctx=BN_CTX_new()) == NULL) goto err;
BN_init(&m1);
BN_init(&r1);
BN_init(&vrfy);
if (rsa->flags & RSA_FLAG_CACHE_PRIVATE)
{
@ -541,10 +542,19 @@ static int RSA_eay_mod_exp(BIGNUM *r0, const BIGNUM *I, RSA *rsa)
if (!BN_mul(&r1,r0,rsa->q,ctx)) goto err;
if (!BN_add(r0,&r1,&m1)) goto err;
if (rsa->e && rsa->n)
{
if (!rsa->meth->bn_mod_exp(&vrfy,r0,rsa->e,rsa->n,ctx,NULL)) goto err;
if (BN_cmp(I, &vrfy) != 0)
{
if (!rsa->meth->bn_mod_exp(r0,I,rsa->d,rsa->n,ctx,NULL)) goto err;
}
}
ret=1;
err:
BN_clear_free(&m1);
BN_clear_free(&r1);
BN_clear_free(&vrfy);
BN_CTX_free(ctx);
return(ret);
}