47 lines
1023 B
C
47 lines
1023 B
C
#include "os.h"
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#include <libsec.h>
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/* rfc2104 */
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DigestState*
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hmac_x(uint8_t *p, uint32_t len, uint8_t *key, uint32_t klen, uint8_t *digest, DigestState *s,
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DigestState*(*x)(uint8_t*, uint32_t, uint8_t*, DigestState*), int xlen)
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{
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int i;
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uint8_t pad[Hmacblksz+1], innerdigest[256];
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if(xlen > sizeof(innerdigest))
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return nil;
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if(klen > Hmacblksz){
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if(xlen > Hmacblksz)
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return nil;
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(*x)(key, klen, innerdigest, nil);
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key = innerdigest;
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klen = xlen;
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}
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/* first time through */
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if(s == nil || s->seeded == 0){
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jehanne_memset(pad, 0x36, Hmacblksz);
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pad[Hmacblksz] = 0;
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for(i = 0; i < klen; i++)
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pad[i] ^= key[i];
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s = (*x)(pad, Hmacblksz, nil, s);
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if(s == nil)
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return nil;
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}
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s = (*x)(p, len, nil, s);
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if(digest == nil)
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return s;
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/* last time through */
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jehanne_memset(pad, 0x5c, Hmacblksz);
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pad[Hmacblksz] = 0;
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for(i = 0; i < klen; i++)
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pad[i] ^= key[i];
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(*x)(nil, 0, innerdigest, s);
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s = (*x)(pad, Hmacblksz, nil, nil);
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(*x)(innerdigest, xlen, digest, s);
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return nil;
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}
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