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109 lines
2.3 KiB
109 lines
2.3 KiB
3 months ago
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/*
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* HMAC-SHA1 Message Authentication Code (RFC 2202)
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*
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* (c) 2008--2009 Martin Mares <mj@ucw.cz>
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*
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* This software may be freely distributed and used according to the terms
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* of the GNU Lesser General Public License.
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*/
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#include <ucw/lib.h>
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#include <ucw/sha1.h>
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#include <string.h>
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void
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sha1_hmac_init(sha1_hmac_context *hd, const byte *key, uint keylen)
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{
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byte keybuf[SHA1_BLOCK_SIZE], buf[SHA1_BLOCK_SIZE];
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// Hash the key if necessary
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if (keylen <= SHA1_BLOCK_SIZE)
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{
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memcpy(keybuf, key, keylen);
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bzero(keybuf + keylen, SHA1_BLOCK_SIZE - keylen);
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}
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else
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{
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sha1_hash_buffer(keybuf, key, keylen);
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bzero(keybuf + SHA1_SIZE, SHA1_BLOCK_SIZE - SHA1_SIZE);
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}
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// Initialize the inner digest
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sha1_init(&hd->ictx);
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for (int i=0; i < SHA1_BLOCK_SIZE; i++)
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buf[i] = keybuf[i] ^ 0x36;
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sha1_update(&hd->ictx, buf, SHA1_BLOCK_SIZE);
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// Initialize the outer digest
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sha1_init(&hd->octx);
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for (int i=0; i < SHA1_BLOCK_SIZE; i++)
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buf[i] = keybuf[i] ^ 0x5c;
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sha1_update(&hd->octx, buf, SHA1_BLOCK_SIZE);
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}
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void
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sha1_hmac_update(sha1_hmac_context *hd, const byte *data, uint datalen)
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{
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// Just update the inner digest
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sha1_update(&hd->ictx, data, datalen);
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}
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byte *sha1_hmac_final(sha1_hmac_context *hd)
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{
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// Finish the inner digest
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byte *isha = sha1_final(&hd->ictx);
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// Finish the outer digest
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sha1_update(&hd->octx, isha, SHA1_SIZE);
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return sha1_final(&hd->octx);
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}
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void
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sha1_hmac(byte *outbuf, const byte *key, uint keylen, const byte *data, uint datalen)
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{
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sha1_hmac_context hd;
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sha1_hmac_init(&hd, key, keylen);
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sha1_hmac_update(&hd, data, datalen);
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byte *osha = sha1_hmac_final(&hd);
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memcpy(outbuf, osha, SHA1_SIZE);
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}
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#ifdef TEST
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#include <stdio.h>
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#include <ucw/string.h>
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static uint rd(char *dest)
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{
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char buf[1024];
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if (!fgets(buf, sizeof(buf), stdin))
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die("fgets()");
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*strchr(buf, '\n') = 0;
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if (buf[0] == '0' && buf[1] == 'x')
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{
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const char *e = hex_to_mem(dest, buf+2, 1024, 0);
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ASSERT(!*e);
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return (e-buf-2)/2;
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}
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else
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{
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strcpy(dest, buf);
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return strlen(dest);
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}
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}
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int main(void)
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{
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char key[1024], data[1024];
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byte hmac[SHA1_SIZE];
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uint kl = rd(key);
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uint dl = rd(data);
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sha1_hmac(hmac, key, kl, data, dl);
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mem_to_hex(data, hmac, SHA1_SIZE, 0);
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puts(data);
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return 0;
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}
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#endif
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