PEM⽂件格式详细解析
PEM⽂件格式存档
Author：Roson sun
Time：2006-4-11
1．描述：
Openssl使⽤PEM(RFC 1421－1424)⽂档格式，如果使⽤其他语⾔包，则需要将此格式进⾏解码并将各个私公钥加⼊。2．说明：
a)        ⾸先使⽤BASE64解码，如果是⾮ANSI TXT格式，需要做转换。
b)        ⼀个RSA私钥包含⼀下信息（1024位）：
>openssl rsa -in key.pem -noout -text
modulus:
00:d5:00:b2:18:c3:04:d1:ac:80:c6:22:a0:cc:5c:
f1:c0:4a:83:95:e5:c9:88:ae:31:64:ab:e1:15:42:
de:1a:da:bc:f5:d2:05:05:74:9d:d3:86:94:9b:9d:
74:bb:e5:72:a4:b8:40:27:61:88:d4:ac:20:b0:2b:
1c:1e:d7:9b:43:c5:06:b6:3a:b4:42:f0:5a:22:38:
23:74:99:4a:50:f1:f1:54:11:5a:44:0b:40:cf:83:
8a:73:6c:34:15:98:0a:7d:cf:0e:e5:00:8d:07:40:
f7:7d:fb:3f:64:35:1b:5d:a3:40:a9:51:fa:92:7d:
34:ef:03:fe:e0:59:56:31:25
数量:128
publicExponent:
01:00:01
数量:3
privateExponent:
11:e2:a8:11:ba:36:6a:60:c0:c3:62:5e:fc:2a:05:
c6:ae:bb:13:d8:22:af:0e:69:69:59:a1:61:c6:a6:
9d:bc:a6:47:41:e6:58:09:ed:c2:b8:37:3c:45:e1:
6a:71:9e:c9:c4:0a:e7:03:a2:98:b1:07:61:a3:8d:
0d:ed:ee:c4:7f:ca:fe:7d:c1:2e:2f:ca:3d:16:81:
4f:bf:ad:6a:03:ca:d7:80:dc:57:03:fe:cf:1f:37:
05:8d:58:79:14:01:1f:66:42:e4:f1:b6:9d:f1:01:
37:12:f4:d8:15:c0:cc:9b:fc:ea:55:cb:2f:ba:46:
fd:17:11:7e:43:b5:d1:15
数量:128
prime1:
00:ed:a0:e8:25:cc:1c:aa:f5:44:e2:78:9e:54:2c: 1d:60:cb:8f:32:b3:68:6d:b3:1d:cd:a9:8c:2a:ca: 02:bc:7b:a7:8b:06:1d:fa:af:4f:8c:26:81:54:12: ec:7d:92:20:77:85:ef:6e:06:a6:8b:9c:eb:ab:6a: e6:a1:83:6d:a3
数量:64（去掉开头的0）
prime2:
00:e5:78:66:5a:84:22:51:78:2d:14:fc:5f:f8:4e: 45:5f:e3:b2:5e:5b:50:a4:f5:55:e0:f3:0e:98:2c: 52:61:c2:50:df:f4:b7:bc:6e:69:3e:99:ff:1c:50: a8:89:05:7a:2b:25:91:56:a5:a6:8f:8a:ec:80:82: fa:eb:09:c2:97
数量:64（去掉开头的0）
exponent1:
00:89:e6:26:d2:48:71:1a:84:db:44:d1:da:8f:de: 49:ee:32:33:17:a9:25:a1:03:a0:f8:08:bc:5e:d8: 7c:5e:05:24:65:79:57:4c:73:10:26:b4:f1:b8:68: 82:f5:1c:27:db:34:ce:8d:7b:2e:8b:36:b5:4c:f4: ec:82:2e:53:21
数量:64（去掉开头的0）
exponent2:
6a:16:a6:e3:74:31:55:8f:04:f0:ad:d9:44:b8:13: 14:c8:f5:5e:f0:42:b1:71:07:5a:2f:a4:f0:af:95:
0a:c3:46:96:b3:d1:fa:58:e5:69:5e:d2:f5:e9:48: 71:c8:c9:79:87:2d:d1:6c:56:3c:08:d3:5c:7a:b1: bc:d6:4f:53
数量:64
coefficient:
62:dd:3f:f4:c7:30:c7:77:5e:8c:ae:c8:11:c1:23: b0:6d:7d:07:54:8f:e7:12:1d:e1:00:ad:70:55:12: 43:f6:6f:a9:d7:94:9d:33:15:66:16:2d:d1:76:13: 33:0d:ae:6f:e3:3f:46:4b:4a:78:14:02:2e:72:66: 59:0c:2d:6a
数量:64
c)        与C#中RSAParameter结构体对应表：
说明PEM RSAParameter
Modulus modulus
Exponent Exponent
prime1P
exponent1Q
prime2DP
exponent2DQ
coefficient InverseQ
privateExponentD
d)        PEM偏移（1024位，以0为开始字符，⼗进制）
说明PEM私钥PEM公钥长度
Modulus1129128
PublicExponent1411593
PrivateExponent147×128
Prime1278×64
Prime2345×64
Exponent1412×64
Exponent2478×64
Coefficient545×64
e)        例⼦程序（C＃）：
/
// <summary>
/// ⽤得到的解码值来得到相应的Parameter（BASE64->RSAParameter）        /// </summary>
/// <param name="hashKey">源</param>
/// <param name="type">0私钥1公钥</param>
/// <returns></returns>
public RSAParameters getKeyPara(string hashKey,int type)
{
RSAParameters rsaP=new RSAParameters();
byte[] tmpKeyNoB64=Convert.FromBase64String(hashKey);
int pemModulus=128;
int pemPublicExponent=3;
int pemPrivateExponent=128;
int pemPrime1=64;
int pemPrime2=64;
int pemExponent1=64;
int pemExponent2=64;
int pemCoefficient=64;
byte[] arrPemModulus=new byte[128];
byte[] arrPemPublicExponent=new byte[3];
byte[] arrPemPrivateExponent=new byte[128];
byte[] arrPemPrime1=new byte[64];
byte[] arrPemPrime2=new byte[64];
byte[] arrPemExponent1=new byte[64];
byte[] arrPemExponent2=new byte[64];
byte[] arrPemCoefficient=new byte[64];
if(type==0)//私钥
{
//Modulus
for(int i=0;i<pemModulus;i++)
{
arrPemModulus[i]=tmpKeyNoB64[11+i];
}
rsaP.Modulus=arrPemModulus;
/
/PublicExponent
for(int i=0;i<pemPublicExponent;i++)
{
arrPemPublicExponent[i]=tmpKeyNoB64[141+i];                  }
rsaP.Exponent=arrPemPublicExponent;
//PrivateExponent
for(int i=0;i<pemPrivateExponent;i++)
{
arrPemPrivateExponent[i]=tmpKeyNoB64[147+i];                  }
rsaP.D=arrPemPrivateExponent;
//Prime1
for(int i=0;i<pemPrime1;i++)
{
arrPemPrime1[i]=tmpKeyNoB64[278+i];
}
rsaP.P=arrPemPrime1;
//Prime2
for(int i=0;i<pemPrime2;i++)
{
arrPemPrime2[i]=tmpKeyNoB64[345+i];
}
rsaP.Q=arrPemPrime2;
/
/Exponent1
for(int i=0;i<pemExponent1;i++)
{
arrPemExponent1[i]=tmpKeyNoB64[412+i];
}
rsaP.DP=arrPemExponent1;
//Exponent2
for(int i=0;i<pemExponent2;i++)
typec转dp{
arrPemExponent2[i]=tmpKeyNoB64[478+i];
}
rsaP.DQ=arrPemExponent2;
//Coefficient
for(int i=0;i<pemCoefficient;i++)
{
arrPemCoefficient[i]=tmpKeyNoB64[545+i];
}
rsaP.InverseQ=arrPemCoefficient;
}
else//公钥
{
for(int i=0;i<pemModulus;i++)
{
arrPemModulus[i]=tmpKeyNoB64[29+i];
}
rsaP.Modulus=arrPemModulus;
for(int i=0;i<pemPublicExponent;i++)
{
arrPemPublicExponent[i]=tmpKeyNoB64[159+i];                  }

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