diff --git a/library/sha1.c b/library/sha1.c
index 6fc937123..56532b124 100644
--- a/library/sha1.c
+++ b/library/sha1.c
@@ -41,17 +41,10 @@
 #endif /* MBEDTLS_PLATFORM_C */
 #endif /* MBEDTLS_SELF_TEST */
 
-#define SHA1_VALIDATE_RET(cond)                             \
-    MBEDTLS_INTERNAL_VALIDATE_RET( cond, MBEDTLS_ERR_SHA1_BAD_INPUT_DATA )
-
-#define SHA1_VALIDATE(cond)  MBEDTLS_INTERNAL_VALIDATE( cond )
-
 #if !defined(MBEDTLS_SHA1_ALT)
 
 void mbedtls_sha1_init( mbedtls_sha1_context *ctx )
 {
-    SHA1_VALIDATE( ctx != NULL );
-
     memset( ctx, 0, sizeof( mbedtls_sha1_context ) );
 }
 
@@ -66,9 +59,6 @@ void mbedtls_sha1_free( mbedtls_sha1_context *ctx )
 void mbedtls_sha1_clone( mbedtls_sha1_context *dst,
                          const mbedtls_sha1_context *src )
 {
-    SHA1_VALIDATE( dst != NULL );
-    SHA1_VALIDATE( src != NULL );
-
     *dst = *src;
 }
 
@@ -77,8 +67,6 @@ void mbedtls_sha1_clone( mbedtls_sha1_context *dst,
  */
 int mbedtls_sha1_starts( mbedtls_sha1_context *ctx )
 {
-    SHA1_VALIDATE_RET( ctx != NULL );
-
     ctx->total[0] = 0;
     ctx->total[1] = 0;
 
@@ -100,9 +88,6 @@ int mbedtls_internal_sha1_process( mbedtls_sha1_context *ctx,
         uint32_t temp, W[16], A, B, C, D, E;
     } local;
 
-    SHA1_VALIDATE_RET( ctx != NULL );
-    SHA1_VALIDATE_RET( (const unsigned char *)data != NULL );
-
     local.W[ 0] = MBEDTLS_GET_UINT32_BE( data,  0 );
     local.W[ 1] = MBEDTLS_GET_UINT32_BE( data,  4 );
     local.W[ 2] = MBEDTLS_GET_UINT32_BE( data,  8 );
@@ -277,9 +262,6 @@ int mbedtls_sha1_update( mbedtls_sha1_context *ctx,
     size_t fill;
     uint32_t left;
 
-    SHA1_VALIDATE_RET( ctx != NULL );
-    SHA1_VALIDATE_RET( ilen == 0 || input != NULL );
-
     if( ilen == 0 )
         return( 0 );
 
@@ -329,9 +311,6 @@ int mbedtls_sha1_finish( mbedtls_sha1_context *ctx,
     uint32_t used;
     uint32_t high, low;
 
-    SHA1_VALIDATE_RET( ctx != NULL );
-    SHA1_VALIDATE_RET( (unsigned char *)output != NULL );
-
     /*
      * Add padding: 0x80 then 0x00 until 8 bytes remain for the length
      */
@@ -392,9 +371,6 @@ int mbedtls_sha1( const unsigned char *input,
     int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
     mbedtls_sha1_context ctx;
 
-    SHA1_VALIDATE_RET( ilen == 0 || input != NULL );
-    SHA1_VALIDATE_RET( (unsigned char *)output != NULL );
-
     mbedtls_sha1_init( &ctx );
 
     if( ( ret = mbedtls_sha1_starts( &ctx ) ) != 0 )