From: Filippo Valsorda <hi@filippo.io>
Date: Thu, 8 Feb 2018 15:19:24 +0000 (+0100)
Subject: crypto/rsa: improve error message for keys too short for PSS
X-Git-Tag: go1.11beta1~1655
X-Git-Url: http://www.git.cypherpunks.su/?a=commitdiff_plain;h=c0094338fb29e00ef9a3bf5613637e27e7b1dc83;p=gostls13.git

crypto/rsa: improve error message for keys too short for PSS

Fixes #23736

Change-Id: I850d91a512394c4292927d51c475064bfa4e3053
Reviewed-on: https://go-review.googlesource.com/92815
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
---

diff --git a/src/crypto/rsa/pss.go b/src/crypto/rsa/pss.go
index 75558a92cf..3ff0c2f4d0 100644
--- a/src/crypto/rsa/pss.go
+++ b/src/crypto/rsa/pss.go
@@ -36,7 +36,7 @@ func emsaPSSEncode(mHash []byte, emBits int, salt []byte, hash hash.Hash) ([]byt
 	// 3.  If emLen < hLen + sLen + 2, output "encoding error" and stop.
 
 	if emLen < hLen+sLen+2 {
-		return nil, errors.New("crypto/rsa: encoding error")
+		return nil, errors.New("crypto/rsa: key size too small for PSS signature")
 	}
 
 	em := make([]byte, emLen)