mirror of https://github.com/0intro/conterm
57 lines
1.1 KiB
C
57 lines
1.1 KiB
C
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#include "os.h"
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#include <libsec.h>
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/* rfc2104 */
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static DigestState*
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hmac_x(uchar *p, ulong len, uchar *key, ulong klen, uchar *digest, DigestState *s,
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DigestState*(*x)(uchar*, ulong, uchar*, DigestState*), int xlen)
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{
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int i;
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uchar pad[65], innerdigest[256];
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if(xlen > sizeof(innerdigest))
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return nil;
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if(klen>64)
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return nil;
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/* first time through */
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if(s == nil){
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for(i=0; i<64; i++)
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pad[i] = 0x36;
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pad[64] = 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, 64, nil, nil);
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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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for(i=0; i<64; i++)
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pad[i] = 0x5c;
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pad[64] = 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, 64, 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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DigestState*
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hmac_sha1(uchar *p, ulong len, uchar *key, ulong klen, uchar *digest, DigestState *s)
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{
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return hmac_x(p, len, key, klen, digest, s, sha1, SHA1dlen);
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}
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DigestState*
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hmac_md5(uchar *p, ulong len, uchar *key, ulong klen, uchar *digest, DigestState *s)
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{
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return hmac_x(p, len, key, klen, digest, s, md5, MD5dlen);
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}
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