OpenSSL 1.0.0生成p12、jks、crt等格式证书的命令个过程
此生成的证书可用于浏览器、java、tomcat、c++等。在此备忘！

1.创建根证私钥
命令：
openssl genrsa -out root-key.key 1024

2.创建根证书请求文件
命令：
openssl req -new -out root-req.csr -key root-key.key -keyform PEM

3.自签根证书
命令：
openssl x509 -req -in root-req.csr -out root-cert.cer -signkey root-key.key -CAcreateserial -days 3650

4.导出p12格式根证书
命令：
openssl pkcs12 -export -clcerts -in root-cert.cer -inkey root-key.key -out root.p12

5.生成root.jks文件
keytool -import -v -trustcacerts -storepass 123456 -alias root -file root-cert.cer -keystore
root.jks

生成客户端文件：
1.生成客户端key
openssl genrsa -out client-key.key 1024
2.生成客户端请求文件
openssl req -new -out client-req.csr -key client-key.key
3.生成客户端证书（root证书，rootkey，客户端key，客户端请求文件这4个生成客户端证书）
openssl x509 -req -in client-req.csr -out client-cert.cer -signkey client-key.key -CA root-cert.cer
-CAkey root-key.key -CAcreateserial -days 3650
4.生成客户端p12格式根证书
openssl pkcs12 -export -clcerts -in client-cert.cer -inkey client-key.key -out client.p12

客户端jks：
keytool -import -v -trustcacerts -storepass 123456 -alias client -file client-cert.cer -keystore
client.jks

生成服务端文件：
1.生成服务端key
openssl genrsa -out server-key.key 1024
2.生成服务端请求文件
openssl req -new -out server-req.csr -key server-key.key
3.生成服务端证书（root证书，rootkey，客户端key，客户端请求文件这4个生成客户端证书）
openssl x509 -req -in server-req.csr -out server-cert.cer -signkey server-key.key -CA root-cert.cer
-CAkey root-key.key -CAcreateserial -days 3650
4.生成服务端p12格式根证书
openssl pkcs12 -export -clcerts -in server-cert.cer -inkey server-key.key -out server.p12
服务端JKS
keytool -import -v -trustcacerts -storepass 123456 -alias server -file server-cert.cer -keystore
server.jks

无密码key命令：
openssl rsa -in client-key.key -out client-key.key.unsecure

Signing NSData (using SHA256 with RSA):

NSData* PKCSSignBytesSHA256withRSA(NSData* plainData, SecKeyRef privateKey){    size_t signedHashBytesSize = SecKeyGetBlockSize(privateKey);    uint8_t* signedHashBytes = malloc(signedHashBytesSize);    memset(signedHashBytes, 0x0, signedHashBytesSize);    size_t hashBytesSize = CC_SHA256_DIGEST_LENGTH;    uint8_t* hashBytes = malloc(hashBytesSize);    if (!CC_SHA256([plainData bytes], (CC_LONG)[plainData length], hashBytes)) {        return nil;    }    SecKeyRawSign(privateKey,                  kSecPaddingPKCS1SHA256,                  hashBytes,                  hashBytesSize,                  signedHashBytes,                  &signedHashBytesSize);    NSData* signedHash = [NSData dataWithBytes:signedHashBytes                                        length:(NSUInteger)signedHashBytesSize];    if (hashBytes)        free(hashBytes);    if (signedHashBytes)        free(signedHashBytes);    return signedHash;}

Verification (using SHA256 with RSA):

BOOL PKCSVerifyBytesSHA256withRSA(NSData* plainData, NSData* signature, SecKeyRef publicKey){    size_t signedHashBytesSize = SecKeyGetBlockSize(publicKey);    const void* signedHashBytes = [signature bytes];    size_t hashBytesSize = CC_SHA256_DIGEST_LENGTH;    uint8_t* hashBytes = malloc(hashBytesSize);    if (!CC_SHA256([plainData bytes], (CC_LONG)[plainData length], hashBytes)) {        return nil;    }    OSStatus status = SecKeyRawVerify(publicKey,                                      kSecPaddingPKCS1SHA256,                                      hashBytes,                                      hashBytesSize,                                      signedHashBytes,                                      signedHashBytesSize);    return status == errSecSuccess;}

Alternatives (OpenSSL):

There is a very good alternative available which utilizes OpenSSL directly instead of libCommonCrypto.MIHCrypto is a well-designed Objective-C wrapper library for OpenSSL which makes working with cryptography very easy. See the example below.

Generating a key is that simple:

MIHAESKeyFactory *factory = [[MIHAESKeyFactory alloc] init];id<MIHSymmetricKey> aesKey = [factory generateKey];

Or loading a key from file:

NSData *privateKeyData = [[NSFileManager defaultManager] contentsAtPath:"mykey.pem"];MIHRSAPrivateKey *privateKey = [[MIHRSAPrivateKey alloc] initWithData:privateKeyData];

Now sign something:

NSError *signingError = nil;NSData *message = // load something to sign from somewhereNSData *signature = [privateKey signWithSHA256:message error:&signingError]

For more examples browse the MIHCrypto page.

OpenSSL实现服务端客户端双向认证