java rsa密钥转pkcs8,关于pkcs8 与 rsa 互转的一个坑

其实最主要就2条命令(环境为centos6.5 已安装openssl openssl-devel 这2个包):

pkcs8转rsa:

openssl rsa -in pkcs8密钥 -out rsa密钥

rsa转pkcs8:

openssl pkcs8 -topk8 -inform PEM -in rsa密钥 -outform PEM -nocrypt -out pkcs8密钥

但是坑的地方是格式

看个例子(pkcs8转rsa)：

假设开发给过来一个密钥

[root@localhost test]# cat test.pkcs8

MIICdQIBADANBgkqhkiG9w0BAQEFAASCAl8wggJbAgEAAoGBANzST5PZDWx+HWdDVAGE4PlADMB4gm1r0AGCvmcm68diL6Gjspm7flIesPURVxbEMzyUjMxPCm6aLPfcYSvORqDXR67ygUWszcPGtJDB/KPl+efDeCunKKQhmriyZIkdeOEjvlxjtmcji+vL7cC7nIcvlPx8EywzM9bwvfg/0hSDAgMBAAECgYA4O3I6Uy6g7yirsDCHRoBH2LCmnsmP9cF9cP7to7KtDmrUvavwjBdp8Bjd/3FvAb2OcsG8EXC1o5tJ7xvrnNbNC4zhHabMbFs9hCnahJbLIe7AJFerwQJRhtT7DmX0ax6MtdPXrFGoGUyM5uc5JX5cUCtzE7vhMO0nvLSKu/bw6QJBAO8npWjXdIy+BjKBsWYXHmlUg3m84P735z6qGdK/Xxq9U/F9v2XFd6TSfwWNFPFWoXnjnAg6J2nD4hD2J8/wam0CQQDsYBWl0/AX3CvZFR5tkBXCMmf30mQvziiJUbC5EPj4Jh4GirXevFSFcsie3H2D7xQ55FC2IVCNJeM0isGoSiSvAkABRCl5C6L/V8Y6oDsrOjYcAqmLjHd4giGEUGxAlGjRgG0gWzUXOdtvUPoBMoUI3heOyKi71mr9AV+CDXuae0BlAkAZB+PC97qJDEuoZVAfkg57zhKsb58kYNRyFjB8qIt027R6RN4VhCP/LbSI/hhcjEi8CK1zW/vHtqdkvPzc8V0JAkBzCYP7ggfbB6Ea0kd4+FoKkddwb91h4tQHH6BXsDl1CURqT2HGeiAbLkETcp7Wsgs5HiMHGcVxv8Xt/mtwFLMK

[root@localhost test]#

我开始使用命令转换

[root@localhost test]# openssl rsa -in test.pkcs8 -out test.rsa

unable to load Private Key

139656125785928:error:0906D06C:PEM routines:PEM_read_bio:no start line:pem_lib.c:703:Expecting: ANY PRIVATE KEY

[root@localhost test]#

报错了！

然后习惯性百度：

大概说的是需要添加头部和尾部然后试试

[root@localhost test]# cat test.pkcs8

-----BEGIN PRIVATE KEY-----

-----END PRIVATE KEY-----

[root@localhost test]# openssl rsa -in test.pkcs8 -out test.rsa

unable to load Private Key

140395488638792:error:0906D064:PEM routines:PEM_read_bio:bad base64 decode:pem_lib.c:812:

[root@localhost test]#

ps:rsa和pkcs8头尾是不一样的这里我加的是pkcs8的不过还是不行。

然后大量的谷歌大量的百度。。so就是没有找到为什么。。之后我开始模拟生成rsa 在转成pkcs8 看能不能转回来

[root@localhost test]# openssl genrsa -out 1 1024

Generating RSA private key, 1024 bit long modulus

...........................++++++

........++++++

e is 65537 (0x10001)

[root@localhost test]# cat 1

-----BEGIN RSA PRIVATE KEY-----

MIICXQIBAAKBgQDaps4+IdCD7nmalOhcx2FndMok++4ZeT1heQhS4dxwmZRcUSoA

2fW/2slVpBt0dWozrjyF0XO+j2M7OZkz6A7G6lgEshtIWhHYOsjkujQuQp5kDhsm

LyB0pa9CcvX/HzdG/gFPqlaoRrqDH0/ZOtt0gukp8uIdvXqwLO3fyR/48wIDAQAB

AoGBAIJBkOgOuOt/q83dG7f5xxscxjfWJXfjdB+XPNAzYWFq/KkqaP1s2yvaKMru

IrT0Jbp39/I4Xt2NCi6EF7KGchYQJFFw5Vk7rx+yWcSwzn5VMkLTCXo5VRRcXADP

j8oO0mNotEeA3Lm9s1ItyAJYiDd/hVZ9B8mVNGKabwtmWV8BAkEA8GiW9q32IV2D

0fy5S+ozyrsOeA7sQMgVp2wZ1Oo/WTvC8a/Lrny5W0AUggM7J+IMVxdqaGgzOrhJ

TNikdNVbswJBAOjU/k6TMZz1kC/SAv8PiNmVg+WEYeJjxOtm4wlyQFOjS74Az2U4

sRIvHmNs9Lp6CvHjkfeSCr0aqTAYIY0LTcECQHnONDbV2y/6hpB9QJEDH6ym6+TO

g***1TTXo5rp+KDIk7QKwuMsVGm0ZO+enXlOobv6pDI0IUiuGI1z8pczhtsCQQDe

6bVEU0aHyM8wCXhW7G+QKcaqwnDYx75rxgiOLbWKnefRVIM7nOhiyXvloxY3Rssd

xUwl48umO1VKN4A/wlfBAkB6/wdKAgw1lNXbDX0qXBgT7ODq/tMYPkSkHej+KXOJ

T1pMPLALJK1BRQgiYndR6Fp97oXz8rhflPgXq8ys+Bvf

-----END RSA PRIVATE KEY-----

[root@localhost test]# openssl pkcs8 -topk8 -inform PEM -in 1 -outform PEM -nocrypt -out 1.pkcs8

[root@localhost test]# cat 1.pkcs8

-----BEGIN PRIVATE KEY-----

MIICdwIBADANBgkqhkiG9w0BAQEFAASCAmEwggJdAgEAAoGBANqmzj4h0IPueZqU

6FzHYWd0yiT77hl5PWF5CFLh3HCZlFxRKgDZ9b/ayVWkG3R1ajOuPIXRc76PYzs5

mTPoDsbqWASyG0haEdg6yOS6NC5CnmQOGyYvIHSlr0Jy9f8fN0b+AU+qVqhGuoMf

T9k623SC6Sny4h29erAs7d/JH/jzAgMBAAECgYEAgkGQ6A6463+rzd0bt/nHGxzG

N9Yld+N0H5c80DNhYWr8qSpo/WzbK9ooyu4itPQlunf38jhe3Y0KLoQXsoZyFhAk

UXDlWTuvH7JZxLDOflUyQtMJejlVFFxcAM+Pyg7SY2i0R4Dcub2zUi3IAliIN3+F

Vn0HyZU0YppvC2ZZXwECQQDwaJb2rfYhXYPR/LlL6jPKuw54DuxAyBWnbBnU6j9Z

O8Lxr8uufLlbQBSCAzsn4gxXF2poaDM6uElM2KR01VuzAkEA6NT+TpMxnPWQL9IC

/w+I2ZWD5YRh4mPE62bjCXJAU6NLvgDPZTixEi8eY2z0unoK8eOR95IKvRqpMBgh

jQtNwQJAec40NtXbL/qGkH1AkQMfrKbr5M6CyyvVNNejmun4oMiTtArC4yxUabRk

756deU6hu/qkMjQhSK4YjXPylzOG2wJBAN7ptURTRofIzzAJeFbsb5ApxqrCcNjH

vmvGCI4ttYqd59FUgzuc6GLJe+WjFjdGyx3FTCXjy6Y7VUo3gD/CV8ECQHr/B0oC

DDWU1dsNfSpcGBPs4Or+0xg+RKQd6P4pc4lPWkw8sAskrUFFCCJid1HoWn3uhfPy

uF+U+BerzKz4G98=

-----END PRIVATE KEY-----

[root@localhost test]# openssl rsa -in 1.pkcs8 -out 1.rsa

writing RSA key

[root@localhost test]# cat 1.rsa