diff --git a/library/pkparse.c b/library/pkparse.c
index 73d59a6..9194040 100644
--- a/library/pkparse.c
+++ b/library/pkparse.c
@@ -56,11 +56,6 @@
 #define mbedtls_free       free
 #endif
 
-/* Parameter validation macros based on platform_util.h */
-#define PK_VALIDATE_RET( cond )    \
-    MBEDTLS_INTERNAL_VALIDATE_RET( cond, MBEDTLS_ERR_PK_BAD_INPUT_DATA )
-#define PK_VALIDATE( cond )        \
-    MBEDTLS_INTERNAL_VALIDATE( cond )
 
 #if defined(MBEDTLS_FS_IO)
 /*
@@ -75,9 +70,6 @@
     FILE *f;
     long size;
 
-    PK_VALIDATE_RET( path != NULL );
-    PK_VALIDATE_RET( buf != NULL );
-    PK_VALIDATE_RET( n != NULL );
 
     if( ( f = fopen( path, "rb" ) ) == NULL )
         return( MBEDTLS_ERR_PK_FILE_IO_ERROR );
@@ -133,8 +125,6 @@
     size_t n;
     unsigned char *buf;
 
-    PK_VALIDATE_RET( ctx != NULL );
-    PK_VALIDATE_RET( path != NULL );
 
     if( ( ret = mbedtls_pk_load_file( path, &buf, &n ) ) != 0 )
         return( ret );
@@ -160,8 +150,6 @@
     size_t n;
     unsigned char *buf;
 
-    PK_VALIDATE_RET( ctx != NULL );
-    PK_VALIDATE_RET( path != NULL );
 
     if( ( ret = mbedtls_pk_load_file( path, &buf, &n ) ) != 0 )
         return( ret );
@@ -620,10 +608,6 @@
     mbedtls_pk_type_t pk_alg = MBEDTLS_PK_NONE;
     const mbedtls_pk_info_t *pk_info;
 
-    PK_VALIDATE_RET( p != NULL );
-    PK_VALIDATE_RET( *p != NULL );
-    PK_VALIDATE_RET( end != NULL );
-    PK_VALIDATE_RET( pk != NULL );
 
     if( ( ret = mbedtls_asn1_get_tag( p, end, &len,
                     MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE ) ) != 0 )
@@ -1217,10 +1201,8 @@
     mbedtls_pem_context pem;
 #endif
 
-    PK_VALIDATE_RET( pk != NULL );
     if( keylen == 0 )
         return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT );
-    PK_VALIDATE_RET( key != NULL );
 
 #if defined(MBEDTLS_PEM_PARSE_C)
    mbedtls_pem_init( &pem );
@@ -1436,10 +1418,8 @@
     mbedtls_pem_context pem;
 #endif
 
-    PK_VALIDATE_RET( ctx != NULL );
     if( keylen == 0 )
         return( MBEDTLS_ERR_PK_KEY_INVALID_FORMAT );
-    PK_VALIDATE_RET( key != NULL || keylen == 0 );
 
 #if defined(MBEDTLS_PEM_PARSE_C)
     mbedtls_pem_init( &pem );