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Simplify length mismatch check in x509_get_pubkey

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Manuel Pégourié-Gonnard 2013-07-09 12:26:00 +02:00 committed by Paul Bakker
parent 20c12f6b5f
commit f16ac763f6
1 changed files with 7 additions and 10 deletions
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17
library/x509parse.c
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@ -550,7 +550,6 @@ static int x509_get_pubkey( unsigned char **p,
int ret; int ret;
size_t len; size_t len;
x509_buf pk_alg_oid; x509_buf pk_alg_oid;
unsigned char *end2;
pk_type_t pk_alg = POLARSSL_PK_NONE; pk_type_t pk_alg = POLARSSL_PK_NONE;
if( ( ret = asn1_get_tag( p, end, &len, if( ( ret = asn1_get_tag( p, end, &len,
@ -582,7 +581,9 @@ static int x509_get_pubkey( unsigned char **p,
return( POLARSSL_ERR_X509_CERT_INVALID_PUBKEY + return( POLARSSL_ERR_X509_CERT_INVALID_PUBKEY +
POLARSSL_ERR_ASN1_OUT_OF_DATA ); POLARSSL_ERR_ASN1_OUT_OF_DATA );
end2 = *p + len; if( *p + len != end )
return( POLARSSL_ERR_X509_CERT_INVALID_PUBKEY +
POLARSSL_ERR_ASN1_LENGTH_MISMATCH );
if( *(*p)++ != 0 ) if( *(*p)++ != 0 )
return( POLARSSL_ERR_X509_CERT_INVALID_PUBKEY ); return( POLARSSL_ERR_X509_CERT_INVALID_PUBKEY );
@ -593,22 +594,18 @@ static int x509_get_pubkey( unsigned char **p,
* publicExponent INTEGER -- e * publicExponent INTEGER -- e
* } * }
*/ */
if( ( ret = asn1_get_tag( p, end2, &len, if( ( ret = asn1_get_tag( p, end, &len,
ASN1_CONSTRUCTED | ASN1_SEQUENCE ) ) != 0 ) ASN1_CONSTRUCTED | ASN1_SEQUENCE ) ) != 0 )
return( POLARSSL_ERR_X509_CERT_INVALID_PUBKEY + ret ); return( POLARSSL_ERR_X509_CERT_INVALID_PUBKEY + ret );
if( *p + len != end2 ) if( *p + len != end )
return( POLARSSL_ERR_X509_CERT_INVALID_PUBKEY + return( POLARSSL_ERR_X509_CERT_INVALID_PUBKEY +
POLARSSL_ERR_ASN1_LENGTH_MISMATCH ); POLARSSL_ERR_ASN1_LENGTH_MISMATCH );
if( ( ret = asn1_get_mpi( p, end2, &rsa->N ) ) != 0 || if( ( ret = asn1_get_mpi( p, end, &rsa->N ) ) != 0 ||
( ret = asn1_get_mpi( p, end2, &rsa->E ) ) != 0 ) ( ret = asn1_get_mpi( p, end, &rsa->E ) ) != 0 )
return( POLARSSL_ERR_X509_CERT_INVALID_PUBKEY + ret ); return( POLARSSL_ERR_X509_CERT_INVALID_PUBKEY + ret );
if( *p != end )
return( POLARSSL_ERR_X509_CERT_INVALID_PUBKEY +
POLARSSL_ERR_ASN1_LENGTH_MISMATCH );
if( ( ret = rsa_check_pubkey( rsa ) ) != 0 ) if( ( ret = rsa_check_pubkey( rsa ) ) != 0 )
return( ret ); return( ret );