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Clarify state handling in find_parent(_in)()

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This commit is contained in:
Manuel Pégourié-Gonnard 2017-08-23 11:20:48 +02:00
parent 83e923ba2b
commit 3627a8b2f6
1 changed files with 14 additions and 20 deletions
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32
library/x509_crt.c
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@ -1992,13 +1992,20 @@ static int x509_crt_find_parent_in(
int signature_is_good, fallback_sign_good;
#if defined(MBEDTLS_ECDSA_C) && defined(MBEDTLS_ECP_RESTARTABLE)
/* restore state if we have some stored */
/* did we have something in progress? */
if( rs_ctx != NULL && rs_ctx->parent != NULL )
{
/* restore saved state */
parent = rs_ctx->parent;
fallback_parent = rs_ctx->fallback_parent;
fallback_sign_good = rs_ctx->fallback_sign_good;
/* clear saved state */
rs_ctx->parent = NULL;
rs_ctx->fallback_parent = NULL;
rs_ctx->fallback_sign_good = 0;
/* resume where we left */
goto check_signature;
}
#endif
@ -2070,16 +2077,6 @@ check_signature:
*r_signature_is_good = fallback_sign_good;
}
#if defined(MBEDTLS_ECDSA_C) && defined(MBEDTLS_ECP_RESTARTABLE)
if( rs_ctx != NULL )
{
/* reset state */
rs_ctx->parent = NULL;
rs_ctx->fallback_parent = NULL;
rs_ctx->fallback_sign_good = 0;
}
#endif
return( 0 );
}
@ -2116,9 +2113,12 @@ static int x509_crt_find_parent(
*parent_is_trusted = 1;
#if defined(MBEDTLS_ECDSA_C) && defined(MBEDTLS_ECP_RESTARTABLE)
/* restore state if we have some stored */
/* restore then clear saved state if we have some stored */
if( rs_ctx != NULL && rs_ctx->parent_is_trusted != -1 )
{
*parent_is_trusted = rs_ctx->parent_is_trusted;
rs_ctx->parent_is_trusted = -1;
}
#endif
while( 1 ) {
@ -2155,12 +2155,6 @@ static int x509_crt_find_parent(
signature_is_good = 0;
}
#if defined(MBEDTLS_ECDSA_C) && defined(MBEDTLS_ECP_RESTARTABLE)
/* reset state */
if( rs_ctx != NULL )
rs_ctx->parent_is_trusted = -1;
#endif
return( 0 );
}
@ -2254,7 +2248,7 @@ static int x509_crt_verify_chain(
/* resume if we had an operation in progress */
if( rs_ctx != NULL && rs_ctx->child != NULL )
{
/* save state */
/* restore saved state */
child = rs_ctx->child;
self_cnt = rs_ctx->self_cnt;
*ver_chain = rs_ctx->ver_chain;