Value,Algorithm Type,Reference
0,Reserved,[RFC3547]
1,SIG_ALG_RSA,[RFC3547]
2,SIG_ALG_DSS,[RFC3547]
3,SIG_ALG_ECDSS,[RFC3547]
4,SIG_ALG_ECDSA-256,[RFC6407]
5,SIG_ALG_ECDSA-384,[RFC6407]
6,SIG_ALG_ECDSA-521,[RFC6407]
7-127,Unassigned,
128-255,Private Use,[RFC3547]
256-65535,Unassigned,