62 lines
1.2 KiB
C
62 lines
1.2 KiB
C
#include "quakedef.h"
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#include "hmac.h"
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qboolean hmac(
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hashfunc_t hfunc, int hlen, int hblock,
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unsigned char *out,
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const unsigned char *in, int n,
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const unsigned char *key, int k
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)
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{
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unsigned char hashbuf[32];
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unsigned char k_xor_ipad[128];
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unsigned char k_xor_opad[128];
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unsigned char *catbuf;
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int i;
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if(sizeof(hashbuf) < (size_t) hlen)
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return false;
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if(sizeof(k_xor_ipad) < (size_t) hblock)
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return false;
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if(sizeof(k_xor_ipad) < (size_t) hlen)
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return false;
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catbuf = (unsigned char *)Mem_Alloc(tempmempool, (size_t) hblock + max((size_t) hlen, (size_t) n));
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if(k > hblock)
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{
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// hash the key if it is too long
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hfunc(k_xor_opad, key, k);
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key = k_xor_opad;
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k = hlen;
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}
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if(k < hblock)
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{
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// zero pad the key if it is too short
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if(key != k_xor_opad)
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memcpy(k_xor_opad, key, k);
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for(i = k; i < hblock; ++i)
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k_xor_opad[i] = 0;
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key = k_xor_opad;
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k = hblock;
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}
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for(i = 0; i < hblock; ++i)
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{
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k_xor_ipad[i] = key[i] ^ 0x36;
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k_xor_opad[i] = key[i] ^ 0x5c;
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}
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memcpy(catbuf, k_xor_ipad, hblock);
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memcpy(catbuf + hblock, in, n);
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hfunc(hashbuf, catbuf, hblock + n);
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memcpy(catbuf, k_xor_opad, hblock);
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memcpy(catbuf + hblock, hashbuf, hlen);
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hfunc(out, catbuf, hblock + hlen);
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Mem_Free(catbuf);
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return true;
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}
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