一，java8以后版本的keytool不再输出md5指纹信息
例子：
[lhdop@blog keystore]$ keytool -list -v -keystore poem.keystore Enter keystore password: Keystore type: PKCS12 Keystore provider: SUN Your keystore contains 1 entry Alias name: poem Creation date: Apr 14, 2023 Entry type: PrivateKeyEntry Certificate chain length: 1 Certificate[1]: Owner: CN=liuhongdi, OU=liuhongdi, O=liuhongdi, L=beijing, ST=beijing, C=86 Issuer: CN=liuhongdi, OU=liuhongdi, O=liuhongdi, L=beijing, ST=beijing, C=86 Serial number: 8028dc6750c99e58 Valid from: Fri Apr 14 09:33:04 CST 2023 until: Sun Mar 21 09:33:04 CST 2123 Certificate fingerprints: SHA1: A1:23:05:8A:5E:3B:9C:8D:03:E5:F5:CB:67:E8:A7:8A:4C:92:07:A2 SHA256: 0F:40:91:72:FD:5A:F2:04:2F:38:1E:80:7F:87:C2:96:44:5B:BD:1F:BA:11:FB:FF:15:7F:55:77:FC:24:AB:C9 Signature algorithm name: SHA256withRSA Subject Public Key Algorithm: 2048-bit RSA key Version: 3 Extensions: #1: ObjectId: 2.5.29.14 Criticality=false SubjectKeyIdentifier [ KeyIdentifier [ 0000: C5 B9 7B C9 EA 27 8A 9D 86 49 AB 19 C7 18 F0 91 .....'...I...... 0010: 13 52 CB 40 .R.@ ] ] ******************************************* *******************************************
说明：可以看到在证书指纹一项下面，只有SHA1和SHA256两项，没有MD5
二，用openssl转换生成md5:
第一个解决办法是切换到jdk 1.7.x,jdk 1.6.x,
第二个方法：如果不想切换jdk版本，在linux环境下可以使用openssl命令来获取md5值
1，查看是否存在openssl命令？
[lhdop@blog keystore]$ openssl version OpenSSL 1.1.1c FIPS 28 May 2019
如openssl命令不存在，用yum安装:
yum install openssl openssl-devel
2,通过openssl获取md5字符串
[lhdop@blog keystore]$ keytool -exportcert -alias poem -storepass testpass -keystore poem.keystore | openssl dgst -md5
(stdin)= 1b2828dd49b64ba5bf1424cfed983019
字符串加冒号:
[lhdop@blog keystore]$ keytool -exportcert -alias poem -storepass testpass -keystore poem.keystore | openssl dgst -md5 | sed 's/[a-fA-F0-9][a-fA-F0-9]/&:/g; s/:$//' (stdin)= 1b:28:28:dd:49:b6:4b:a5:bf:14:24:cf:ed:98:30:19
说明：刘宏缔的架构森林是一个专注架构的博客，地址：https://www.cnblogs.com/architectforest
对应的源码可以访问这里获取： https://github.com/liuhongdi/
或: https://gitee.com/liuhongdi
说明：作者:刘宏缔 邮箱: 371125307@qq.com
三，查看java的版本:
[lhdop@blog keystore]$ java --version java 15 2020-09-15 Java(TM) SE Runtime Environment (build 15+36-1562) Java HotSpot(TM) 64-Bit Server VM (build 15+36-1562, mixed mode, sharing)