diff --git a/library/error.c b/library/error.c
index 2e6bba6..b2e8346 100644
--- a/library/error.c
+++ b/library/error.c
@@ -308,6 +308,8 @@
             snprintf( buf, buflen, "PK - Elliptic curve is unsupported (only NIST curves are supported)" );
         if( use_ret == -(POLARSSL_ERR_PK_FEATURE_UNAVAILABLE) )
             snprintf( buf, buflen, "PK - Unavailable feature, e.g. RSA disabled for RSA key" );
+        if( use_ret == -(POLARSSL_ERR_PK_SIG_LEN_MISMATCH) )
+            snprintf( buf, buflen, "PK - The signature is valid but its length is less than expected" );
 #endif /* POLARSSL_PK_C */
 
 #if defined(POLARSSL_PKCS12_C)
diff --git a/library/pk_wrap.c b/library/pk_wrap.c
index 61e78fe..2a4da03 100644
--- a/library/pk_wrap.c
+++ b/library/pk_wrap.c
@@ -64,11 +64,20 @@
                    const unsigned char *hash, size_t hash_len,
                    const unsigned char *sig, size_t sig_len )
 {
-    if( sig_len != ((rsa_context *) ctx)->len )
+    int ret;
+
+    if( sig_len < ((rsa_context *) ctx)->len )
         return( POLARSSL_ERR_RSA_VERIFY_FAILED );
 
-    return( rsa_pkcs1_verify( (rsa_context *) ctx, NULL, NULL,
-                RSA_PUBLIC, md_alg, (unsigned int) hash_len, hash, sig ) );
+    if( ( ret = rsa_pkcs1_verify( (rsa_context *) ctx, NULL, NULL,
+                                  RSA_PUBLIC, md_alg,
+                                  (unsigned int) hash_len, hash, sig ) ) != 0 )
+        return( ret );
+
+    if( sig_len > ((rsa_context *) ctx)->len )
+        return( POLARSSL_ERR_PK_SIG_LEN_MISMATCH );
+
+    return( 0 );
 }
 
 static int rsa_sign_wrap( void *ctx, md_type_t md_alg,
@@ -292,10 +301,16 @@
                        const unsigned char *hash, size_t hash_len,
                        const unsigned char *sig, size_t sig_len )
 {
+    int ret;
     ((void) md_alg);
 
-    return( ecdsa_read_signature( (ecdsa_context *) ctx,
-                hash, hash_len, sig, sig_len ) );
+    ret = ecdsa_read_signature( (ecdsa_context *) ctx,
+                                hash, hash_len, sig, sig_len );
+
+    if( ret == POLARSSL_ERR_ECP_SIG_LEN_MISMATCH )
+        return( POLARSSL_ERR_PK_SIG_LEN_MISMATCH );
+
+    return( ret );
 }
 
 static int ecdsa_sign_wrap( void *ctx, md_type_t md_alg,