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nts: refactor NTS context

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Add a context structure for the algorithm and keys established by
NTS-KE. Modify the client to save the context and reset the SIV key to
the C2S/S2C key before each request/response instead of keeping two SIV
instances.

This will make it easier for the server to support different algorithms
and allow the client to save the context with cookies to disk.
This commit is contained in:
Miroslav Lichvar
2020-03-30 18:06:57 +02:00
parent 5296858411
commit adcf073484
10 changed files with 121 additions and 91 deletions
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8
nts_ke_server.h
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@@ -33,10 +33,10 @@
extern void NKS_Initialise(int scfilter_level);
extern void NKS_Finalise(void);
/* Generate a new NTS cookie containing the C2S and S2C keys */
extern int NKS_GenerateCookie(NKE_Key *c2s, NKE_Key *s2c, NKE_Cookie *cookie);
/* Generate an NTS cookie with a given context */
extern int NKS_GenerateCookie(NKE_Context *context, NKE_Cookie *cookie);
/* Validate a cookie and extract the C2S and S2C keys */
extern int NKS_DecodeCookie(NKE_Cookie *cookie, NKE_Key *c2s, NKE_Key *s2c);
/* Validate a cookie and decode the context */
extern int NKS_DecodeCookie(NKE_Cookie *cookie, NKE_Context *context);
#endif