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Move underflow test to make time constant

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This commit is contained in:
Janos Follath 2016-02-11 11:08:18 +00:00 committed by Simon Butcher
parent 45a5f7406d
commit 1d114d2efa
1 changed files with 6 additions and 0 deletions
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6
library/rsa.c
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@ -695,6 +695,12 @@ int rsa_rsaes_oaep_decrypt( rsa_context *ctx,
if( md_info == NULL )
return( POLARSSL_ERR_RSA_BAD_INPUT_DATA );
hlen = mbedtls_md_get_size( md_info );
// checking for integer underflow
if( 2 * hlen + 2 > ilen )
return( MBEDTLS_ERR_RSA_BAD_INPUT_DATA );
/*
* RSA operation
*/