hmac.c - vx32 - Local 9vx git repository for patches.
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       ---
       hmac.c (885B)
       ---
            1 #include "os.h"
            2 #include "libsec.h"
            3 
            4 /* rfc2104 */
            5 DigestState*
            6 hmac_x(uchar *p, ulong len, uchar *key, ulong klen, uchar *digest, DigestState *s,
            7         DigestState*(*x)(uchar*, ulong, uchar*, DigestState*), int xlen)
            8 {
            9         int i;
           10         uchar pad[Hmacblksz+1], innerdigest[256];
           11 
           12         if(xlen > sizeof(innerdigest))
           13                 return nil;
           14         if(klen > Hmacblksz)
           15                 return nil;
           16 
           17         /* first time through */
           18         if(s == nil || s->seeded == 0){
           19                 memset(pad, 0x36, Hmacblksz);
           20                 pad[Hmacblksz] = 0;
           21                 for(i = 0; i < klen; i++)
           22                         pad[i] ^= key[i];
           23                 s = (*x)(pad, Hmacblksz, nil, s);
           24                 if(s == nil)
           25                         return nil;
           26         }
           27 
           28         s = (*x)(p, len, nil, s);
           29         if(digest == nil)
           30                 return s;
           31 
           32         /* last time through */
           33         memset(pad, 0x5c, Hmacblksz);
           34         pad[Hmacblksz] = 0;
           35         for(i = 0; i < klen; i++)
           36                 pad[i] ^= key[i];
           37         (*x)(nil, 0, innerdigest, s);
           38         s = (*x)(pad, Hmacblksz, nil, nil);
           39         (*x)(innerdigest, xlen, digest, s);
           40         return nil;
           41 }