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Included tests for the overflow

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Janos Follath 2016-02-08 14:52:29 +00:00 committed by Simon Butcher
parent e007c9fede
commit e33f559de1
1 changed files with 5 additions and 3 deletions
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8
library/rsa.c
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@ -529,7 +529,8 @@ int mbedtls_rsa_rsaes_oaep_encrypt( mbedtls_rsa_context *ctx,
olen = ctx->len; olen = ctx->len;
hlen = mbedtls_md_get_size( md_info ); hlen = mbedtls_md_get_size( md_info );
if( olen < ilen + 2 * hlen + 2 ) // first comparison checks for overflow
if( ilen + 2 * hlen + 2 < ilen || olen < ilen + 2 * hlen + 2 )
return( MBEDTLS_ERR_RSA_BAD_INPUT_DATA ); return( MBEDTLS_ERR_RSA_BAD_INPUT_DATA );
memset( output, 0, olen ); memset( output, 0, olen );
@ -595,8 +596,9 @@ int mbedtls_rsa_rsaes_pkcs1_v15_encrypt( mbedtls_rsa_context *ctx,
return( MBEDTLS_ERR_RSA_BAD_INPUT_DATA ); return( MBEDTLS_ERR_RSA_BAD_INPUT_DATA );
olen = ctx->len; olen = ctx->len;
if( olen < ilen + 11 ) // first comparison checks for overflow
if( ilen + 11 < ilen || olen < ilen + 11 )
return( MBEDTLS_ERR_RSA_BAD_INPUT_DATA ); return( MBEDTLS_ERR_RSA_BAD_INPUT_DATA );
nb_pad = olen - 3 - ilen; nb_pad = olen - 3 - ilen;