how can I get cipher suite name by its number? ssl3_get_cipher(unsigned int u)?

[Richard Kao]

Hi folks,

What I want to do is to get the name of the cipher suite server is trying to 
use when I receive a server hello.

From server hello's header (SSL version 3.0), I can read out the cipher 
suite number, which is, for example 0x0004, and my Ethereal (Version 
0.10.13) shows it is TLS_RSA_WITH_RC4_128_MD5 (0x0004).  In 
..../openssl/ssl/s3_lib.c,  I found out that /* Cipher 04 */ is 
SSL3_TXT_RSA_RC4_128_MD5. Is this a correct mapping? If it is, which API I 
can use to get this name?

I tried ssl3_get_cipher(unsigned int u), it returns a different name. For 
0x0004, it returns /* Cipher 36 */ TLS1_TXT_DH_DSS_WITH_AES_256_SHA ( 
"DH-DSS-AES256-SHA"). The function is like this:

SSL_CIPHER *ssl3_get_cipher(unsigned int u)
        {
        if (u < SSL3_NUM_CIPHERS)
                return(&(ssl3_ciphers[SSL3_NUM_CIPHERS-1-u]));
        else
                return(NULL);
        }

What does the line "return(&(ssl3_ciphers[SSL3_NUM_CIPHERS-1-u]))" mean? Why 
not just  "return(&(ssl3_ciphers[u]))" ?

Which one is a correct mapping? Ethereal's Cipher 04 or ssl3_get_cipher()'s 
Cipher 36?

Thanks,

Rick

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