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Fix potential signedness issue

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This commit is contained in:
Manuel Pégourié-Gonnard 2015-02-13 17:15:18 +00:00
parent 6ca4076468
commit 6fdc4cae53
2 changed files with 7 additions and 4 deletions
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2
ChangeLog
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@ -14,6 +14,8 @@ Bugfix
* Fix hardclock() (only used in the benchmarking program) with some
versions of mingw64 (found by kxjhlele).
* Fix warnings from mingw64 in timing.c (found by kxjklele).
* Fix potential unintended sign extension in asn1_get_len() on 64-bit
platforms.
Changes
* Move from SHA-1 to SHA-256 in example programs using signatures

9
library/asn1parse.c
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@ -77,7 +77,7 @@ int asn1_get_len( unsigned char **p,
if( ( end - *p ) < 3 )
return( POLARSSL_ERR_ASN1_OUT_OF_DATA );
*len = ( (*p)[1] << 8 ) | (*p)[2];
*len = ( (size_t)(*p)[1] << 8 ) | (*p)[2];
(*p) += 3;
break;
@ -85,7 +85,8 @@ int asn1_get_len( unsigned char **p,
if( ( end - *p ) < 4 )
return( POLARSSL_ERR_ASN1_OUT_OF_DATA );
*len = ( (*p)[1] << 16 ) | ( (*p)[2] << 8 ) | (*p)[3];
*len = ( (size_t)(*p)[1] << 16 ) |
( (size_t)(*p)[2] << 8 ) | (*p)[3];
(*p) += 4;
break;
@ -93,8 +94,8 @@ int asn1_get_len( unsigned char **p,
if( ( end - *p ) < 5 )
return( POLARSSL_ERR_ASN1_OUT_OF_DATA );
*len = ( (*p)[1] << 24 ) | ( (*p)[2] << 16 ) | ( (*p)[3] << 8 ) |
(*p)[4];
*len = ( (size_t)(*p)[1] << 24 ) | ( (size_t)(*p)[2] << 16 ) |
( (size_t)(*p)[3] << 8 ) | (*p)[4];
(*p) += 5;
break;