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Update tutorial-tcp-psk.md

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Nathanrauch 2014-07-01 11:29:50 -06:00
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psk/tutorial-tcp-psk.md
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@ -251,80 +251,6 @@ Session resumption allows a client/server pair to re-use previously generated cr
CyaSSL_Cleanup();
## **Tutorial for adding Cyassl Security and PSK (Pre shared Keys) to a Simple Client.**
1. Include the CyaSSL compatibility header:
```
#include <cyassl/ssl.h>
```
* Change all calls from read() or recv() to CyaSSL_read(), in the simple client
```
read(sockfd, recvline, MAXLINE)
```
becomes
```
CyaSSL_read(ssl, recvline, MAXLINE)
```
3. Change all calls from write() or send() to CySSL_write(), in the simple client ``` write(socked, send line,strlen(send line)) ``` becomes ``` CyaSSL_write(ssl, send line, strlen(sendline))```
4. In the main method initialize CyaSSL and CYASSL_CTX.
CyaSSL_Init();
if ((ctx = CyaSSL_CTX_new(CyaTLSv1_2_client_method())) == NULL)
fprintf(stderr, "SSL_CTX_new error.\n");
return 1;
}
5. Create the CyaSSL object after each TCP connect and associate the file descriptor with the session:
if ( (ssl = CyaSSL_new(ctx)) == NULL) {
fprintf(stderr, "CyaSSL_new error.\n");
return 1;
}
ret = CyaSSL_set_fd(ssl, sockfd);
if (ret != SSL_SUCCESS){
return 1;
}
6. Cleanup. After each CyaSSL object is done being used you can free it up by calling `CyaSSL_free(ssl);`
7. When completely done using SSL/TLS, free the CYASSL_CTX object by `CyaSSL_CTX_free(CTX);`
`CyaSSL_Cleanup();`
**Now we add Pre-Shared Keys (PSK) to the CyaSSL Simple Client **
1. When configuring CyaSSL
`sudo ./configure --enable-psk`
`sudo make`
`sudo make install`
* In the main method add
`CyaSSL_CTX_set_psk_client_callback(ctx, My_Psk_Client_cb);`
3. Add the function
static inline unsigned int My_Psk_Client_Cb(CYASSL* ssl, const char* hint,
char* identity, unsigned int id_max_len, unsigned char* key,
unsigned int key_max_len)
{
(void)ssl;
(void)hint;
(void)key_max_len;
strncpy(identity, "Client_identity", id_max_len);
key[0] = 26;
key[1] = 43;
key[2] = 60;
key[3] = 77;
return 4;
}
## **Tutorial for adding Cyassl Security and PSK (Pre shared Keys) to a Simple Server.**
1. Include the CyaSSL compatibility header: