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The purpose of the Diffie-Hellman algorithm is to make it possible for two or more hosts to create and share an identical, secret encryption key, by simply sharing information over a network that is not secure. The information that gets shared over the network is in the form of a couple of constant values, and a D-H public key.
The Microsoft Diffie-Hellman/Schannel Cryptographic Provider supports the following algorithms.
| Algorithm ID | Description | Comments |
|---|---|---|
| CALG_DH_SF | Diffie-Hellman store and forward key exchange algorithm | Key length: Can be set, 384 bits to 512 bits in 8 bit increments. Default key length: 512 bits. |
| CALG_MD5 | MD5 hashing algorithm. | Provided only for hashing. |
| CALG_DH_EPHEM | Ephemeral D-H key exchange. | Key length: Can be set, 384 bits to 512 bits in 8 bit increments. Default key length: 512 bits. |
| CALG_SHA | SHA hashing algorithm. | Must be used for DSS signatures. |
| CALG_RC2 | RC2 block encryption algorithm | Key length: 40 to 88 bits. |
| CALG_RC4 | RC4 stream encryption algorithm | Key length: 40 to 88 bits. |
| CALG_CYLINK_ MEK |
DES variant encryption algorithm | Key length: 40 bits. |