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make RSA blinding thread-safe

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This commit is contained in:
Bodo Möller
2003-04-02 09:50:55 +00:00
parent 6076f21f5e
commit 46b695d850
6 changed files with 128 additions and 16 deletions
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11
crypto/rsa/rsa_lib.c
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@@ -329,6 +329,10 @@ int RSA_blinding_on(RSA *rsa, BN_CTX *p_ctx)
if (rsa->blinding != NULL)
BN_BLINDING_free(rsa->blinding);
/* NB: similar code appears in setup_blinding (rsa_eay.c);
* this should be placed in a new function of its own, but for reasons
* of binary compatibility can't */
BN_CTX_start(ctx);
A = BN_CTX_get(ctx);
if ((RAND_status() == 0) && rsa->d != NULL && rsa->d->d != NULL)
@@ -344,8 +348,11 @@ int RSA_blinding_on(RSA *rsa, BN_CTX *p_ctx)
if ((Ai=BN_mod_inverse(NULL,A,rsa->n,ctx)) == NULL) goto err;
if (!rsa->meth->bn_mod_exp(A,A,rsa->e,rsa->n,ctx,rsa->_method_mod_n))
goto err;
rsa->blinding=BN_BLINDING_new(A,Ai,rsa->n);
goto err;
if ((rsa->blinding=BN_BLINDING_new(A,Ai,rsa->n)) == NULL) goto err;
/* to make things thread-safe without excessive locking,
* rsa->blinding will be used just by the current thread: */
rsa->blinding->thread_id = CRYPTO_thread_id();
rsa->flags |= RSA_FLAG_BLINDING;
rsa->flags &= ~RSA_FLAG_NO_BLINDING;
BN_free(Ai);