LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.
-*/
+ */
/**
* @file src/util/crypto_hkdf.c
* - Matthias Wachs (08.10.2010)
*/
-#define LOG(kind,...) GNUNET_log_from (kind, "util-crypto-hkdf", __VA_ARGS__)
+#define LOG(kind, ...) GNUNET_log_from(kind, "util-crypto-hkdf", __VA_ARGS__)
/**
* Set this to 0 if you compile this code outside of GNUnet.
* @return HMAC, freed by caller via gcry_md_close/_reset
*/
static const void *
-doHMAC (gcry_md_hd_t mac, const void *key, size_t key_len, const void *buf,
- size_t buf_len)
+doHMAC(gcry_md_hd_t mac, const void *key, size_t key_len, const void *buf,
+ size_t buf_len)
{
- gcry_md_setkey (mac, key, key_len);
- gcry_md_write (mac, buf, buf_len);
+ gcry_md_setkey(mac, key, key_len);
+ gcry_md_write(mac, buf, buf_len);
- return (const void *) gcry_md_read (mac, 0);
+ return (const void *)gcry_md_read(mac, 0);
}
/**
* @return #GNUNET_YES on success
*/
static int
-getPRK (gcry_md_hd_t mac, const void *xts, size_t xts_len, const void *skm,
- size_t skm_len, void *prk)
+getPRK(gcry_md_hd_t mac, const void *xts, size_t xts_len, const void *skm,
+ size_t skm_len, void *prk)
{
const void *ret;
- ret = doHMAC (mac, xts, xts_len, skm, skm_len);
+ ret = doHMAC(mac, xts, xts_len, skm, skm_len);
if (ret == NULL)
return GNUNET_SYSERR;
- GNUNET_memcpy (prk, ret, gcry_md_get_algo_dlen (gcry_md_get_algo (mac)));
+ GNUNET_memcpy(prk, ret, gcry_md_get_algo_dlen(gcry_md_get_algo(mac)));
return GNUNET_YES;
}
#if DEBUG_HKDF
static void
-dump (const char *src, const void *p, unsigned int l)
+dump(const char *src, const void *p, unsigned int l)
{
unsigned int i;
- printf ("\n%s: ", src);
+ printf("\n%s: ", src);
for (i = 0; i < l; i++)
- {
- printf ("%2x", (int) ((const unsigned char *) p)[i]);
- }
- printf ("\n");
+ {
+ printf("%2x", (int)((const unsigned char *)p)[i]);
+ }
+ printf("\n");
}
#endif
* @return #GNUNET_YES on success
*/
int
-GNUNET_CRYPTO_hkdf_v (void *result, size_t out_len, int xtr_algo, int prf_algo,
- const void *xts, size_t xts_len, const void *skm,
- size_t skm_len, va_list argp)
+GNUNET_CRYPTO_hkdf_v(void *result, size_t out_len, int xtr_algo, int prf_algo,
+ const void *xts, size_t xts_len, const void *skm,
+ size_t skm_len, va_list argp)
{
gcry_md_hd_t xtr;
gcry_md_hd_t prf;
unsigned long i;
unsigned long t;
unsigned long d;
- unsigned int k = gcry_md_get_algo_dlen (prf_algo);
- unsigned int xtr_len = gcry_md_get_algo_dlen (xtr_algo);
+ unsigned int k = gcry_md_get_algo_dlen(prf_algo);
+ unsigned int xtr_len = gcry_md_get_algo_dlen(xtr_algo);
char prk[xtr_len];
int ret;
size_t ctx_len;
va_list args;
- BENCHMARK_START (hkdf);
+ BENCHMARK_START(hkdf);
if (0 == k)
return GNUNET_SYSERR;
if (GPG_ERR_NO_ERROR !=
- gcry_md_open (&xtr, xtr_algo, GCRY_MD_FLAG_HMAC))
+ gcry_md_open(&xtr, xtr_algo, GCRY_MD_FLAG_HMAC))
return GNUNET_SYSERR;
if (GPG_ERR_NO_ERROR !=
- gcry_md_open (&prf, prf_algo, GCRY_MD_FLAG_HMAC))
- {
- gcry_md_close (xtr);
- return GNUNET_SYSERR;
- }
- va_copy (args, argp);
+ gcry_md_open(&prf, prf_algo, GCRY_MD_FLAG_HMAC))
+ {
+ gcry_md_close(xtr);
+ return GNUNET_SYSERR;
+ }
+ va_copy(args, argp);
ctx_len = 0;
- while (NULL != va_arg (args, void *))
- ctx_len += va_arg (args, size_t);
+ while (NULL != va_arg(args, void *))
+ ctx_len += va_arg(args, size_t);
- va_end (args);
+ va_end(args);
- memset (result, 0, out_len);
- if (getPRK (xtr, xts, xts_len, skm, skm_len, prk) != GNUNET_YES)
+ memset(result, 0, out_len);
+ if (getPRK(xtr, xts, xts_len, skm, skm_len, prk) != GNUNET_YES)
goto hkdf_error;
#if DEBUG_HKDF
- dump ("PRK", prk, xtr_len);
+ dump("PRK", prk, xtr_len);
#endif
t = out_len / k;
char *dst;
dst = plain + k;
- va_copy (args, argp);
- while ((ctx = va_arg (args, void *)))
- {
- size_t len;
+ va_copy(args, argp);
+ while ((ctx = va_arg(args, void *)))
+ {
+ size_t len;
- len = va_arg (args, size_t);
- GNUNET_memcpy (dst, ctx, len);
- dst += len;
- }
- va_end (args);
+ len = va_arg(args, size_t);
+ GNUNET_memcpy(dst, ctx, len);
+ dst += len;
+ }
+ va_end(args);
if (t > 0)
- {
- memset (plain + k + ctx_len, 1, 1);
+ {
+ memset(plain + k + ctx_len, 1, 1);
#if DEBUG_HKDF
- dump ("K(1)", plain, plain_len);
+ dump("K(1)", plain, plain_len);
#endif
- hc = doHMAC (prf, prk, xtr_len, &plain[k], ctx_len + 1);
- if (hc == NULL)
- goto hkdf_error;
- GNUNET_memcpy (result, hc, k);
- result += k;
- }
+ hc = doHMAC(prf, prk, xtr_len, &plain[k], ctx_len + 1);
+ if (hc == NULL)
+ goto hkdf_error;
+ GNUNET_memcpy(result, hc, k);
+ result += k;
+ }
/* K(i+1) */
for (i = 1; i < t; i++)
- {
- GNUNET_memcpy (plain, result - k, k);
- memset (plain + k + ctx_len, i + 1, 1);
- gcry_md_reset (prf);
+ {
+ GNUNET_memcpy(plain, result - k, k);
+ memset(plain + k + ctx_len, i + 1, 1);
+ gcry_md_reset(prf);
#if DEBUG_HKDF
- dump ("K(i+1)", plain, plain_len);
+ dump("K(i+1)", plain, plain_len);
#endif
- hc = doHMAC (prf, prk, xtr_len, plain, plain_len);
- if (hc == NULL)
- goto hkdf_error;
- GNUNET_memcpy (result, hc, k);
- result += k;
- }
+ hc = doHMAC(prf, prk, xtr_len, plain, plain_len);
+ if (hc == NULL)
+ goto hkdf_error;
+ GNUNET_memcpy(result, hc, k);
+ result += k;
+ }
/* K(t):d */
if (d > 0)
- {
- if (t > 0)
{
- GNUNET_memcpy (plain, result - k, k);
- i++;
- }
- memset (plain + k + ctx_len, i, 1);
- gcry_md_reset (prf);
+ if (t > 0)
+ {
+ GNUNET_memcpy(plain, result - k, k);
+ i++;
+ }
+ memset(plain + k + ctx_len, i, 1);
+ gcry_md_reset(prf);
#if DEBUG_HKDF
- dump ("K(t):d", plain, plain_len);
+ dump("K(t):d", plain, plain_len);
#endif
- if (t > 0)
- hc = doHMAC (prf, prk, xtr_len, plain, plain_len);
- else
- hc = doHMAC (prf, prk, xtr_len, plain + k, plain_len - k);
- if (hc == NULL)
- goto hkdf_error;
- GNUNET_memcpy (result, hc, d);
- }
+ if (t > 0)
+ hc = doHMAC(prf, prk, xtr_len, plain, plain_len);
+ else
+ hc = doHMAC(prf, prk, xtr_len, plain + k, plain_len - k);
+ if (hc == NULL)
+ goto hkdf_error;
+ GNUNET_memcpy(result, hc, d);
+ }
#if DEBUG_HKDF
- dump ("result", result - k, out_len);
+ dump("result", result - k, out_len);
#endif
ret = GNUNET_YES;
hkdf_error:
ret = GNUNET_SYSERR;
hkdf_ok:
- gcry_md_close (xtr);
- gcry_md_close (prf);
- BENCHMARK_END (hkdf);
+ gcry_md_close(xtr);
+ gcry_md_close(prf);
+ BENCHMARK_END(hkdf);
return ret;
}
* @return #GNUNET_YES on success
*/
int
-GNUNET_CRYPTO_hkdf (void *result, size_t out_len, int xtr_algo, int prf_algo,
- const void *xts, size_t xts_len, const void *skm,
- size_t skm_len, ...)
+GNUNET_CRYPTO_hkdf(void *result, size_t out_len, int xtr_algo, int prf_algo,
+ const void *xts, size_t xts_len, const void *skm,
+ size_t skm_len, ...)
{
va_list argp;
int ret;
- va_start (argp, skm_len);
+ va_start(argp, skm_len);
ret =
- GNUNET_CRYPTO_hkdf_v (result, out_len, xtr_algo, prf_algo, xts, xts_len,
- skm, skm_len, argp);
- va_end (argp);
+ GNUNET_CRYPTO_hkdf_v(result, out_len, xtr_algo, prf_algo, xts, xts_len,
+ skm, skm_len, argp);
+ va_end(argp);
return ret;
}
projects / oweals / gnunet.git / blobdiff