Hi,
When studying the SSL structure, I was confused by some variables.
Here is the definition of ssl_st:
struct ssl_st
{
......
......
/* These are the ones being used, the ones is SSL_SESSION are
* the ones to be 'copied' into these ones */
EVP_CIPHER_CTX *enc_read_ctx; /* cryptographic state */
const EVP_MD *read_hash; /* used for mac generation */
#ifdef HEADER_COMP_H
COMP_CTX *expand; /* uncompress */
#else
char *expand;
#endif
EVP_CIPHER_CTX *enc_write_ctx; /* cryptographic state */
const EVP_MD *write_hash; /* used for mac generation */
#ifdef HEADER_COMP_H
COMP_CTX *compress; /* compression */
#else
char *compress;
#endif
.......
.......
}
What I concern is the cipher suite that encrypt the application data
after a ssl connection is built. In this definition the variables
"enc_write_ctx" and "compress" are related to data encryption.
I found that in the function
int ssl3_enc(SSL *s, int send) /* in s3_enc.c */
EVP_Cipher() is called to encrypt record data, using "enc_write_ctx".
data. Whereas in the function
static int do_ssl3_write(SSL *s, int type, const unsigned char *buf,
unsigned int len); /* in s3_pkt.c */
do_compress() is called to compress data, using "compress".
Can anyone explain the funtions of these variables for me? When is
ssl3_enc() called? and when is do_ssl3_write() called?
Shawroo King.
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