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102 lines
2.0 KiB
C
102 lines
2.0 KiB
C
#include <string.h>
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#include <stdint.h>
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#ifdef USE_OPENSSL
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#include <openssl/sha.h>
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#include <openssl/hmac.h>
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#include <openssl/err.h>
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#else
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#include "sha.h"
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#endif
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#include "Hmacsha1.h"
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/** SHA-1 Block size */
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#ifndef SHA_BLOCKSIZE
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#define SHA_BLOCKSIZE (64)
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#endif
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/**
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* Function to compute the digest
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*
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* @param k Secret key
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* @param lk Length of the key in bytes
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* @param d Data
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* @param ld Length of data in bytes
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* @param out Digest output
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* @param t Size of digest output
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*/
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void hmac_sha1(const uint8_t *k, /* secret key */
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size_t lk, /* length of the key in bytes */
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const uint8_t *d, /* data */
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size_t ld, /* length of data in bytes */
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uint8_t *out, /* output buffer, at least "t" bytes */
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size_t *t) {
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#ifdef USE_OPENSSL
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if (!HMAC(EVP_sha1(), k, (int)lk, d, ld, out, t)) {
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ERR_clear_error();
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}
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#else
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SHA_CTX ictx, octx;
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uint8_t isha[SHA_DIGEST_LENGTH], osha[SHA_DIGEST_LENGTH];
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uint8_t key[SHA_DIGEST_LENGTH];
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uint8_t buf[SHA_BLOCKSIZE];
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size_t i;
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if (lk > SHA_BLOCKSIZE) {
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SHA_CTX tctx;
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SHA1_Init(&tctx);
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SHA1_Update(&tctx, k, lk);
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SHA1_Final(key, &tctx);
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k = key;
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lk = SHA_DIGEST_LENGTH;
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}
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/**** Inner Digest ****/
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SHA1_Init(&ictx);
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/* Pad the key for inner digest */
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for (i = 0; i < lk; ++i) {
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buf[i] = k[i] ^ 0x36;
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}
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for (i = lk; i < SHA_BLOCKSIZE; ++i) {
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buf[i] = 0x36;
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}
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SHA1_Update(&ictx, buf, SHA_BLOCKSIZE);
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SHA1_Update(&ictx, d, ld);
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SHA1_Final(isha, &ictx);
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/**** Outer Digest ****/
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SHA1_Init(&octx);
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/* Pad the key for outter digest */
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for (i = 0; i < lk; ++i) {
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buf[i] = k[i] ^ 0x5c;
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}
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for (i = lk; i < SHA_BLOCKSIZE; ++i) {
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buf[i] = 0x5c;
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}
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SHA1_Update(&octx, buf, SHA_BLOCKSIZE);
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SHA1_Update(&octx, isha, SHA_DIGEST_LENGTH);
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SHA1_Final(osha, &octx);
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/* truncate and print the results */
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*t = *t > SHA_DIGEST_LENGTH ? SHA_DIGEST_LENGTH : *t;
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memcpy(out, osha, *t);
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#endif
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}
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