fixed: sm2 signature & verify would lead to error when using cross ve…

…rsion
suxil · Jul 26, 2021 · b7aa8ce · b7aa8ce
1 parent d79d0e1
commit b7aa8ce
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diff --git a/CHANGELOG.md b/CHANGELOG.md
@@ -1,3 +1,6 @@
+## 0.3.1
+
+* 修复 sm2 在 userId 长度大于 31 时新旧版本验签不通过的问题
 ## 0.3.0
 
 * sm2、sm3 重构

diff --git a/src/sm2/index.js b/src/sm2/index.js
@@ -203,7 +203,7 @@ function getHash(hashHex, publicKey, userId = '1234567812345678') {
 
   const entl = userId.length * 4
   data.unshift(entl & 0x00ff)
-  data.unshift(entl & 0xff00)
+  data.unshift(entl >> 8 & 0x00ff)
 
   const z = sm3(data)