Subversion Repositories planix.SVN

#include "os.h"
#include <libsec.h>

/* rfc2104 */
static DigestState*
hmac_x(uchar *p, ulong len, uchar *key, ulong klen, uchar *digest, DigestState *s,
        DigestState*(*x)(uchar*, ulong, uchar*, DigestState*), int xlen)
{
        int i;
        uchar pad[65], innerdigest[256];

        if(xlen > sizeof(innerdigest))
                return nil;

        if(klen>64)
                return nil;

        /* first time through */
        if(s == nil){
                for(i=0; i<64; i++)
                        pad[i] = 0x36;
                pad[64] = 0;
                for(i=0; i<klen; i++)
                        pad[i] ^= key[i];
                s = (*x)(pad, 64, nil, nil);
                if(s == nil)
                        return nil;
        }

        s = (*x)(p, len, nil, s);
        if(digest == nil)
                return s;

        /* last time through */
        for(i=0; i<64; i++)
                pad[i] = 0x5c;
        pad[64] = 0;
        for(i=0; i<klen; i++)
                pad[i] ^= key[i];
        (*x)(nil, 0, innerdigest, s);
        s = (*x)(pad, 64, nil, nil);
        (*x)(innerdigest, xlen, digest, s);
        return nil;
}

DigestState*
hmac_sha1(uchar *p, ulong len, uchar *key, ulong klen, uchar *digest, DigestState *s)
{
        return hmac_x(p, len, key, klen, digest, s, sha1, SHA1dlen);
}

DigestState*
hmac_md5(uchar *p, ulong len, uchar *key, ulong klen, uchar *digest, DigestState *s)
{
        return hmac_x(p, len, key, klen, digest, s, md5, MD5dlen);
}