etype,encryption type,Reference
0,reserved,[RFC6448]
1,des-cbc-crc (deprecated),[RFC6649]
2,des-cbc-md4 (deprecated),[RFC6649]
3,des-cbc-md5 (deprecated),[RFC6649]
4,Reserved,[RFC3961]
5,des3-cbc-md5 (deprecated),[RFC8429]
6,Reserved,[RFC3961]
7,des3-cbc-sha1 (deprecated),[RFC8429]
8,Unassigned,
9,dsaWithSHA1-CmsOID,[RFC4556]
10,md5WithRSAEncryption-CmsOID,[RFC4556]
11,sha1WithRSAEncryption-CmsOID,[RFC4556]
12,rc2CBC-EnvOID,[RFC4556]
13,rsaEncryption-EnvOID,[RFC4556][from PKCS#1 v1.5]]
14,rsaES-OAEP-ENV-OID,[RFC4556][from PKCS#1 v2.0]]
15,des-ede3-cbc-Env-OID,[RFC4556]
16,des3-cbc-sha1-kd (deprecated),[RFC8429]
17,aes128-cts-hmac-sha1-96,[RFC3962]
18,aes256-cts-hmac-sha1-96,[RFC3962]
19,aes128-cts-hmac-sha256-128,[RFC8009]
20,aes256-cts-hmac-sha384-192,[RFC8009]
21-22,Unassigned,
23,rc4-hmac (deprecated),[RFC8429]
24,rc4-hmac-exp (deprecated),[RFC6649]
25,camellia128-cts-cmac,[RFC6803]
26,camellia256-cts-cmac,[RFC6803]
27-64,Unassigned,
65,subkey-keymaterial,[(opaque; PacketCable)]
66-2147483647,Unassigned,