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- #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 || s->seeded == 0){
- 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, s);
- 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);
- }
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