diff options
Diffstat (limited to 'net.c')
| -rw-r--r-- | net.c | 37 |
1 files changed, 37 insertions, 0 deletions
@@ -1,6 +1,8 @@ #include <u.h> #include <libc.h> #include <ip.h> +#include <mp.h> +#include <libsec.h> #include <thread.h> #include <draw.h> #include <geometry.h> @@ -69,6 +71,7 @@ newframe(Frame *pf, u8int type, u32int seq, u32int ack, u16int len, uchar *data) Frame *f; f = emalloc(sizeof(Frame)+len); + memset(f, 0, sizeof(Frame)); f->id = ProtocolID; f->type = type; if(pf != nil){ @@ -88,6 +91,40 @@ newframe(Frame *pf, u8int type, u32int seq, u32int ack, u16int len, uchar *data) } void +signframe(Frame *f, ulong key) +{ + uchar k[sizeof(ulong)]; + uchar h[MD5dlen]; + uchar msg[MTU]; + int n; + + k[0] = key; k[1] = key>>8; k[2] = key>>16; k[3] = key>>24; + + memset(f->sig, 0, MD5dlen); + n = pack(msg, sizeof msg, "f", f); + hmac_md5(msg, n, k, sizeof k, h, nil); + memmove(f->sig, h, MD5dlen); +} + +int +verifyframe(Frame *f, ulong key) +{ + uchar k[sizeof(ulong)]; + uchar h0[MD5dlen], h1[MD5dlen]; + uchar msg[MTU]; + int n; + + k[0] = key; k[1] = key>>8; k[2] = key>>16; k[3] = key>>24; + + memmove(h0, f->sig, MD5dlen); + memset(f->sig, 0, MD5dlen); + n = pack(msg, sizeof msg, "f", f); + hmac_md5(msg, n, k, sizeof k, h1, nil); + memmove(f->sig, h0, MD5dlen); + return memcmp(h0, h1, MD5dlen); +} + +void delframe(Frame *f) { free(f); |