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https://github.com/UberGuidoZ/Flipper.git
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65 lines
1.9 KiB
C
65 lines
1.9 KiB
C
#include <string.h>
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#include "sha256.h"
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#include "memxor.h"
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#define IPAD 0x36
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#define OPAD 0x5c
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/* Concatenate two preprocessor tokens. */
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#define _GLHMAC_CONCAT_(prefix, suffix) prefix##suffix
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#define _GLHMAC_CONCAT(prefix, suffix) _GLHMAC_CONCAT_(prefix, suffix)
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#if GL_HMAC_NAME == 5
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#define HMAC_ALG md5
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#else
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#define HMAC_ALG _GLHMAC_CONCAT(sha, GL_HMAC_NAME)
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#endif
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#define GL_HMAC_CTX _GLHMAC_CONCAT(HMAC_ALG, _ctx)
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#define GL_HMAC_FN _GLHMAC_CONCAT(hmac_, HMAC_ALG)
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#define GL_HMAC_FN_INIT _GLHMAC_CONCAT(HMAC_ALG, _init_ctx)
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#define GL_HMAC_FN_BLOC _GLHMAC_CONCAT(HMAC_ALG, _process_block)
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#define GL_HMAC_FN_PROC _GLHMAC_CONCAT(HMAC_ALG, _process_bytes)
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#define GL_HMAC_FN_FINI _GLHMAC_CONCAT(HMAC_ALG, _finish_ctx)
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static void
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hmac_hash(const void* key, size_t keylen, const void* in, size_t inlen, int pad, void* resbuf) {
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struct GL_HMAC_CTX hmac_ctx;
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char block[GL_HMAC_BLOCKSIZE];
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memset(block, pad, sizeof block);
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memxor(block, key, keylen);
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GL_HMAC_FN_INIT(&hmac_ctx);
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GL_HMAC_FN_BLOC(block, sizeof block, &hmac_ctx);
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GL_HMAC_FN_PROC(in, inlen, &hmac_ctx);
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GL_HMAC_FN_FINI(&hmac_ctx, resbuf);
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}
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int GL_HMAC_FN(const void* key, size_t keylen, const void* in, size_t inlen, void* resbuf) {
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char optkeybuf[GL_HMAC_HASHSIZE];
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char innerhash[GL_HMAC_HASHSIZE];
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/* Ensure key size is <= block size. */
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if(keylen > GL_HMAC_BLOCKSIZE) {
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struct GL_HMAC_CTX keyhash;
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GL_HMAC_FN_INIT(&keyhash);
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GL_HMAC_FN_PROC(key, keylen, &keyhash);
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GL_HMAC_FN_FINI(&keyhash, optkeybuf);
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key = optkeybuf;
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/* zero padding of the key to the block size
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is implicit in the memxor. */
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keylen = sizeof optkeybuf;
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}
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/* Compute INNERHASH from KEY and IN. */
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hmac_hash(key, keylen, in, inlen, IPAD, innerhash);
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/* Compute result from KEY and INNERHASH. */
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hmac_hash(key, keylen, innerhash, sizeof innerhash, OPAD, resbuf);
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return 0;
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}
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