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UM020107-1211 SSL Configuration

ZTP Network Security SSL Plug-In

User Manual

Each of the four supported digest algorithms has an entry that follows the NullHash_New

function pointer.

Each entry in the array is a function pointer that is used to initialize a data structure that the

SSL handshake protocols use to perform digest operations.

NullHash does not perform

any useful function, but it must be included in the

HashGen array for proper operation of

the SSL protocol.

The ordering of entries in the

HashGen array is not arbitrary, and is determined by the

ordinal values of the following macros (see the

ez80_hash.h header file); the values of

these macros must not be altered.

#define SSL_HASH_NULL 0

#define SSL_HASH_MD5 1

#define SSL_HASH_HMAC_MD5 2

#define SSL_HASH_SHA1 3

#define SSL_HASH_HMAC_SHA1 4

Table 5 shows which digest algorithms are required for each of the SSL handshake proto-

cols. If the application uses combinations of protocols, select the last row in the table that

matches one of the SSL handshake protocols used. For example, if your project requires

the SSLv2 and TLSv1 handshake protocols, then the digest algorithms corresponding to

the TLSv1 handshake protocol must appear in the

HashGen array.

If a digest algorithm is not required, replace the corresponding entry in the

HashGen array

with

NullHash_New. For example, in an application required to support SSLv2 and

SSLv3, it is not necessary to include the

HMAC_MD5 or HMAC_SHA1 digest algorithms;

therefore the project can be made slightly smaller by using the following

HashGen array.

HASH_NEW HashGen[ SSL_MAX_HASH ] =

{

NullHash_New,

MD5_New,

Table 5. Mandatory Digest Algorithm by SSL Protocol Version

SSL Handshake 

Protocol version Mandatory Digest Algorithms

SSLv2 MD5

SSLv3 MD5, SHA1

TLSv1 MD5, SHA1, HMAC_MD5, HMAC_SHA1

Note:

1 2 ... 26 27 28 29 30 31 32 33 34 35 36 ... 78 79

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