#include "gnunet_common.h"
#include "gnunet_crypto_lib.h"
#include "gnunet_disk_lib.h"
+#include <gcrypt.h>
-#define SHA512_DIGEST_SIZE 64
-#define SHA512_HMAC_BLOCK_SIZE 128
-
-struct sha512_ctx
-{
- unsigned long long state[8];
- unsigned int count[4];
- unsigned char buf[128];
-};
-
-static unsigned long long
-Ch (unsigned long long x, unsigned long long y, unsigned long long z)
-{
- return z ^ (x & (y ^ z));
-}
-
-static unsigned long long
-Maj (unsigned long long x, unsigned long long y, unsigned long long z)
-{
- return (x & y) | (z & (x | y));
-}
-
-static unsigned long long
-RORu64 (unsigned long long x, unsigned long long y)
-{
- return (x >> y) | (x << (64 - y));
-}
-
-const unsigned long long sha512_K[80] = {
- 0x428a2f98d728ae22ULL, 0x7137449123ef65cdULL, 0xb5c0fbcfec4d3b2fULL,
- 0xe9b5dba58189dbbcULL, 0x3956c25bf348b538ULL, 0x59f111f1b605d019ULL,
- 0x923f82a4af194f9bULL, 0xab1c5ed5da6d8118ULL, 0xd807aa98a3030242ULL,
- 0x12835b0145706fbeULL, 0x243185be4ee4b28cULL, 0x550c7dc3d5ffb4e2ULL,
- 0x72be5d74f27b896fULL, 0x80deb1fe3b1696b1ULL, 0x9bdc06a725c71235ULL,
- 0xc19bf174cf692694ULL, 0xe49b69c19ef14ad2ULL, 0xefbe4786384f25e3ULL,
- 0x0fc19dc68b8cd5b5ULL, 0x240ca1cc77ac9c65ULL, 0x2de92c6f592b0275ULL,
- 0x4a7484aa6ea6e483ULL, 0x5cb0a9dcbd41fbd4ULL, 0x76f988da831153b5ULL,
- 0x983e5152ee66dfabULL, 0xa831c66d2db43210ULL, 0xb00327c898fb213fULL,
- 0xbf597fc7beef0ee4ULL, 0xc6e00bf33da88fc2ULL, 0xd5a79147930aa725ULL,
- 0x06ca6351e003826fULL, 0x142929670a0e6e70ULL, 0x27b70a8546d22ffcULL,
- 0x2e1b21385c26c926ULL, 0x4d2c6dfc5ac42aedULL, 0x53380d139d95b3dfULL,
- 0x650a73548baf63deULL, 0x766a0abb3c77b2a8ULL, 0x81c2c92e47edaee6ULL,
- 0x92722c851482353bULL, 0xa2bfe8a14cf10364ULL, 0xa81a664bbc423001ULL,
- 0xc24b8b70d0f89791ULL, 0xc76c51a30654be30ULL, 0xd192e819d6ef5218ULL,
- 0xd69906245565a910ULL, 0xf40e35855771202aULL, 0x106aa07032bbd1b8ULL,
- 0x19a4c116b8d2d0c8ULL, 0x1e376c085141ab53ULL, 0x2748774cdf8eeb99ULL,
- 0x34b0bcb5e19b48a8ULL, 0x391c0cb3c5c95a63ULL, 0x4ed8aa4ae3418acbULL,
- 0x5b9cca4f7763e373ULL, 0x682e6ff3d6b2b8a3ULL, 0x748f82ee5defb2fcULL,
- 0x78a5636f43172f60ULL, 0x84c87814a1f0ab72ULL, 0x8cc702081a6439ecULL,
- 0x90befffa23631e28ULL, 0xa4506cebde82bde9ULL, 0xbef9a3f7b2c67915ULL,
- 0xc67178f2e372532bULL, 0xca273eceea26619cULL, 0xd186b8c721c0c207ULL,
- 0xeada7dd6cde0eb1eULL, 0xf57d4f7fee6ed178ULL, 0x06f067aa72176fbaULL,
- 0x0a637dc5a2c898a6ULL, 0x113f9804bef90daeULL, 0x1b710b35131c471bULL,
- 0x28db77f523047d84ULL, 0x32caab7b40c72493ULL, 0x3c9ebe0a15c9bebcULL,
- 0x431d67c49c100d4cULL, 0x4cc5d4becb3e42b6ULL, 0x597f299cfc657e2aULL,
- 0x5fcb6fab3ad6faecULL, 0x6c44198c4a475817ULL,
-};
-
-#define e0(x) (RORu64(x,28) ^ RORu64(x,34) ^ RORu64(x,39))
-#define e1(x) (RORu64(x,14) ^ RORu64(x,18) ^ RORu64(x,41))
-#define s0(x) (RORu64(x, 1) ^ RORu64(x, 8) ^ (x >> 7))
-#define s1(x) (RORu64(x,19) ^ RORu64(x,61) ^ (x >> 6))
-
-/* H* initial state for SHA-512 */
-#define H0 0x6a09e667f3bcc908ULL
-#define H1 0xbb67ae8584caa73bULL
-#define H2 0x3c6ef372fe94f82bULL
-#define H3 0xa54ff53a5f1d36f1ULL
-#define H4 0x510e527fade682d1ULL
-#define H5 0x9b05688c2b3e6c1fULL
-#define H6 0x1f83d9abfb41bd6bULL
-#define H7 0x5be0cd19137e2179ULL
-
-/* H'* initial state for SHA-384 */
-#define HP0 0xcbbb9d5dc1059ed8ULL
-#define HP1 0x629a292a367cd507ULL
-#define HP2 0x9159015a3070dd17ULL
-#define HP3 0x152fecd8f70e5939ULL
-#define HP4 0x67332667ffc00b31ULL
-#define HP5 0x8eb44a8768581511ULL
-#define HP6 0xdb0c2e0d64f98fa7ULL
-#define HP7 0x47b5481dbefa4fa4ULL
-
-#define LOAD_OP(t1, I, W, input) \
- t1 = input[(8*I) ] & 0xff;\
- t1 <<= 8;\
- t1 |= input[(8*I)+1] & 0xff;\
- t1 <<= 8;\
- t1 |= input[(8*I)+2] & 0xff;\
- t1 <<= 8;\
- t1 |= input[(8*I)+3] & 0xff;\
- t1 <<= 8;\
- t1 |= input[(8*I)+4] & 0xff;\
- t1 <<= 8;\
- t1 |= input[(8*I)+5] & 0xff;\
- t1 <<= 8;\
- t1 |= input[(8*I)+6] & 0xff;\
- t1 <<= 8;\
- t1 |= input[(8*I)+7] & 0xff;\
- W[I] = t1;
-
-
-#define BLEND_OP(I, W) \
- W[I] = s1(W[I-2]) + W[I-7] + s0(W[I-15]) + W[I-16];
-
-static void
-sha512_transform (unsigned long long *state, const unsigned char *input)
-{
- unsigned long long a, b, c, d, e, f, g, h, t1, t2;
- unsigned long long W[80];
- unsigned long long t0;
- int i;
-
- /* load the input */
- for (i = 0; i < 16; i++)
- {
- LOAD_OP (t0, i, W, input);
- }
-
- for (i = 16; i < 80; i++)
- {
- BLEND_OP (i, W);
- }
-
- /* load the state into our registers */
- a = state[0];
- b = state[1];
- c = state[2];
- d = state[3];
- e = state[4];
- f = state[5];
- g = state[6];
- h = state[7];
-
- /* now iterate */
- for (i = 0; i < 80; i += 8)
- {
- t1 = h + e1 (e) + Ch (e, f, g) + sha512_K[i] + W[i];
- t2 = e0 (a) + Maj (a, b, c);
- d += t1;
- h = t1 + t2;
- t1 = g + e1 (d) + Ch (d, e, f) + sha512_K[i + 1] + W[i + 1];
- t2 = e0 (h) + Maj (h, a, b);
- c += t1;
- g = t1 + t2;
- t1 = f + e1 (c) + Ch (c, d, e) + sha512_K[i + 2] + W[i + 2];
- t2 = e0 (g) + Maj (g, h, a);
- b += t1;
- f = t1 + t2;
- t1 = e + e1 (b) + Ch (b, c, d) + sha512_K[i + 3] + W[i + 3];
- t2 = e0 (f) + Maj (f, g, h);
- a += t1;
- e = t1 + t2;
- t1 = d + e1 (a) + Ch (a, b, c) + sha512_K[i + 4] + W[i + 4];
- t2 = e0 (e) + Maj (e, f, g);
- h += t1;
- d = t1 + t2;
- t1 = c + e1 (h) + Ch (h, a, b) + sha512_K[i + 5] + W[i + 5];
- t2 = e0 (d) + Maj (d, e, f);
- g += t1;
- c = t1 + t2;
- t1 = b + e1 (g) + Ch (g, h, a) + sha512_K[i + 6] + W[i + 6];
- t2 = e0 (c) + Maj (c, d, e);
- f += t1;
- b = t1 + t2;
- t1 = a + e1 (f) + Ch (f, g, h) + sha512_K[i + 7] + W[i + 7];
- t2 = e0 (b) + Maj (b, c, d);
- e += t1;
- a = t1 + t2;
- }
-
- state[0] += a;
- state[1] += b;
- state[2] += c;
- state[3] += d;
- state[4] += e;
- state[5] += f;
- state[6] += g;
- state[7] += h;
-
- /* erase our data */
- a = b = c = d = e = f = g = h = t1 = t2 = 0;
- memset (W, 0, 80 * sizeof (unsigned long long));
-}
-
-static void
-sha512_init (struct sha512_ctx *sctx)
-{
- sctx->state[0] = H0;
- sctx->state[1] = H1;
- sctx->state[2] = H2;
- sctx->state[3] = H3;
- sctx->state[4] = H4;
- sctx->state[5] = H5;
- sctx->state[6] = H6;
- sctx->state[7] = H7;
- sctx->count[0] = sctx->count[1] = sctx->count[2] = sctx->count[3] = 0;
- memset (sctx->buf, 0, sizeof (sctx->buf));
-}
-
-static void
-sha512_update (struct sha512_ctx *sctx,
- const unsigned char *data, unsigned int len)
-{
- unsigned int i, index, part_len;
-
- /* Compute number of bytes mod 128 */
- index = (unsigned int) ((sctx->count[0] >> 3) & 0x7F);
-
- /* Update number of bits */
- if ((sctx->count[0] += (len << 3)) < (len << 3))
- {
- if ((sctx->count[1] += 1) < 1)
- if ((sctx->count[2] += 1) < 1)
- sctx->count[3]++;
- sctx->count[1] += (len >> 29);
- }
-
- part_len = 128 - index;
-
- /* Transform as many times as possible. */
- if (len >= part_len)
- {
- memcpy (&sctx->buf[index], data, part_len);
- sha512_transform (sctx->state, sctx->buf);
-
- for (i = part_len; i + 127 < len; i += 128)
- sha512_transform (sctx->state, &data[i]);
-
- index = 0;
- }
- else
- {
- i = 0;
- }
-
- /* Buffer remaining input */
- memcpy (&sctx->buf[index], &data[i], len - i);
-}
-
-static void
-sha512_final (struct sha512_ctx *sctx, unsigned char *hash)
-{
- static unsigned char padding[128] = { 0x80, };
-
- unsigned int t;
- unsigned long long t2;
- unsigned char bits[128];
- unsigned int index, pad_len;
- int i, j;
-
- index = pad_len = t = i = j = 0;
- t2 = 0;
-
- /* Save number of bits */
- t = sctx->count[0];
- bits[15] = t;
- t >>= 8;
- bits[14] = t;
- t >>= 8;
- bits[13] = t;
- t >>= 8;
- bits[12] = t;
- t = sctx->count[1];
- bits[11] = t;
- t >>= 8;
- bits[10] = t;
- t >>= 8;
- bits[9] = t;
- t >>= 8;
- bits[8] = t;
- t = sctx->count[2];
- bits[7] = t;
- t >>= 8;
- bits[6] = t;
- t >>= 8;
- bits[5] = t;
- t >>= 8;
- bits[4] = t;
- t = sctx->count[3];
- bits[3] = t;
- t >>= 8;
- bits[2] = t;
- t >>= 8;
- bits[1] = t;
- t >>= 8;
- bits[0] = t;
-
- /* Pad out to 112 mod 128. */
- index = (sctx->count[0] >> 3) & 0x7f;
- pad_len = (index < 112) ? (112 - index) : ((128 + 112) - index);
- sha512_update (sctx, padding, pad_len);
-
- /* Append length (before padding) */
- sha512_update (sctx, bits, 16);
-
- /* Store state in digest */
- for (i = j = 0; i < 8; i++, j += 8)
- {
- t2 = sctx->state[i];
- hash[j + 7] = (char) t2 & 0xff;
- t2 >>= 8;
- hash[j + 6] = (char) t2 & 0xff;
- t2 >>= 8;
- hash[j + 5] = (char) t2 & 0xff;
- t2 >>= 8;
- hash[j + 4] = (char) t2 & 0xff;
- t2 >>= 8;
- hash[j + 3] = (char) t2 & 0xff;
- t2 >>= 8;
- hash[j + 2] = (char) t2 & 0xff;
- t2 >>= 8;
- hash[j + 1] = (char) t2 & 0xff;
- t2 >>= 8;
- hash[j] = (char) t2 & 0xff;
- }
-
- /* Zeroize sensitive information. */
- memset (sctx, 0, sizeof (struct sha512_ctx));
-}
/**
* Hash block of given size.
* @param ret pointer to where to write the hashcode
*/
void
-GNUNET_CRYPTO_hash (const void *block, unsigned int size,
- GNUNET_HashCode * ret)
+GNUNET_CRYPTO_hash (const void *block, size_t size, GNUNET_HashCode * ret)
{
- struct sha512_ctx ctx;
-
- sha512_init (&ctx);
- sha512_update (&ctx, block, size);
- sha512_final (&ctx, (unsigned char *) ret);
+ gcry_md_hash_buffer (GCRY_MD_SHA512, ret, block, size);
}
/**
* Context used when hashing a file.
*/
-struct FileHashContext
+struct GNUNET_CRYPTO_FileHashContext
{
/**
char *filename;
/**
- * Cummulated hash.
+ * File descriptor.
*/
- struct sha512_ctx hctx;
+ struct GNUNET_DISK_FileHandle *fh;
/**
- * Blocksize.
+ * Our scheduler.
*/
- size_t bsize;
+ struct GNUNET_SCHEDULER_Handle *sched;
+
+ /**
+ * Cummulated hash.
+ */
+ gcry_md_hd_t md;
/**
* Size of the file.
*/
- unsigned long long fsize;
+ uint64_t fsize;
/**
* Current offset.
*/
- unsigned long long offset;
+ uint64_t offset;
/**
- * Run on shutdown?
+ * Current task for hashing.
*/
- int run_on_shutdown;
+ GNUNET_SCHEDULER_TaskIdentifier task;
/**
- * File descriptor.
+ * Blocksize.
*/
- struct GNUNET_IO_Handle *fh;
+ size_t bsize;
};
* and free associated resources.
*/
static void
-file_hash_finish (struct FileHashContext *fhc, const GNUNET_HashCode * res)
+file_hash_finish (struct GNUNET_CRYPTO_FileHashContext *fhc,
+ const GNUNET_HashCode * res)
{
fhc->callback (fhc->callback_cls, res);
GNUNET_free (fhc->filename);
- if (!GNUNET_IO_handle_invalid (fhc->fh))
- GNUNET_break (0 == GNUNET_DISK_file_close (&fhc->fh));
+ if (!GNUNET_DISK_handle_invalid (fhc->fh))
+ GNUNET_break (GNUNET_OK == GNUNET_DISK_file_close (fhc->fh));
+ gcry_md_close (fhc->md);
GNUNET_free (fhc); /* also frees fhc->buffer */
}
static void
file_hash_task (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
{
- struct FileHashContext *fhc = cls;
- GNUNET_HashCode res;
+ struct GNUNET_CRYPTO_FileHashContext *fhc = cls;
+ GNUNET_HashCode *res;
size_t delta;
+ fhc->task = GNUNET_SCHEDULER_NO_TASK;
GNUNET_assert (fhc->offset < fhc->fsize);
delta = fhc->bsize;
if (fhc->fsize - fhc->offset < delta)
file_hash_finish (fhc, NULL);
return;
}
- sha512_update (&fhc->hctx, fhc->buffer, delta);
+ gcry_md_write (fhc->md, fhc->buffer, delta);
fhc->offset += delta;
if (fhc->offset == fhc->fsize)
{
- sha512_final (&fhc->hctx, (unsigned char *) &res);
- file_hash_finish (fhc, &res);
+ res = (GNUNET_HashCode *) gcry_md_read (fhc->md, GCRY_MD_SHA512);
+ file_hash_finish (fhc, res);
return;
}
- GNUNET_SCHEDULER_add_after (tc->sched,
- fhc->run_on_shutdown,
- GNUNET_SCHEDULER_PRIORITY_KEEP,
- GNUNET_SCHEDULER_NO_PREREQUISITE_TASK,
- &file_hash_task, fhc);
+ fhc->task
+ = GNUNET_SCHEDULER_add_after (tc->sched,
+ GNUNET_SCHEDULER_NO_TASK,
+ &file_hash_task, fhc);
}
*
* @param sched scheduler to use
* @param priority scheduling priority to use
- * @param run_on_shutdown should we complete even on shutdown?
* @param filename name of file to hash
* @param blocksize number of bytes to process in one task
* @param callback function to call upon completion
* @param callback_cls closure for callback
+ * @return NULL on (immediate) errror
*/
-void
+struct GNUNET_CRYPTO_FileHashContext *
GNUNET_CRYPTO_hash_file (struct GNUNET_SCHEDULER_Handle *sched,
enum GNUNET_SCHEDULER_Priority priority,
- int run_on_shutdown,
const char *filename,
size_t blocksize,
GNUNET_CRYPTO_HashCompletedCallback callback,
void *callback_cls)
{
- struct FileHashContext *fhc;
+ struct GNUNET_CRYPTO_FileHashContext *fhc;
GNUNET_assert (blocksize > 0);
- fhc = GNUNET_malloc (sizeof (struct FileHashContext) + blocksize);
+ fhc = GNUNET_malloc (sizeof (struct GNUNET_CRYPTO_FileHashContext) + blocksize);
fhc->callback = callback;
fhc->callback_cls = callback_cls;
+ fhc->sched = sched;
fhc->buffer = (unsigned char *) &fhc[1];
fhc->filename = GNUNET_strdup (filename);
- fhc->fh = NULL;
- sha512_init (&fhc->hctx);
+ if (GPG_ERR_NO_ERROR != gcry_md_open (&fhc->md, GCRY_MD_SHA512, 0))
+ {
+ GNUNET_break (0);
+ GNUNET_free (fhc);
+ return NULL;
+ }
fhc->bsize = blocksize;
if (GNUNET_OK != GNUNET_DISK_file_size (filename, &fhc->fsize, GNUNET_NO))
{
- file_hash_finish (fhc, NULL);
- return;
+ GNUNET_free (fhc->filename);
+ GNUNET_free (fhc);
+ return NULL;
}
- fhc->run_on_shutdown = run_on_shutdown;
fhc->fh = GNUNET_DISK_file_open (filename,
- GNUNET_DISK_OPEN_READ);
+ GNUNET_DISK_OPEN_READ,
+ GNUNET_DISK_PERM_NONE);
if (!fhc->fh)
{
- file_hash_finish (fhc, NULL);
- return;
+ GNUNET_free (fhc->filename);
+ GNUNET_free (fhc);
+ return NULL;
}
- GNUNET_SCHEDULER_add_after (sched,
- run_on_shutdown,
- priority,
- GNUNET_SCHEDULER_NO_PREREQUISITE_TASK,
- &file_hash_task, fhc);
+ fhc->task
+ = GNUNET_SCHEDULER_add_with_priority (sched, priority,
+ &file_hash_task, fhc);
+ return fhc;
}
-/* ***************** binary-ASCII encoding *************** */
-
/**
- * 32 characters for encoding (GNUNET_CRYPTO_hash => 32 characters)
+ * Cancel a file hashing operation.
+ *
+ * @param fhc operation to cancel (callback must not yet have been invoked)
*/
-static char *encTable__ = "0123456789ABCDEFGHIJKLMNOPQRSTUV";
+void
+GNUNET_CRYPTO_hash_file_cancel (struct GNUNET_CRYPTO_FileHashContext *fhc)
+{
+ GNUNET_SCHEDULER_cancel (fhc->sched,
+ fhc->task);
+ GNUNET_free (fhc->filename);
+ GNUNET_break (GNUNET_OK == GNUNET_DISK_file_close (fhc->fh));
+ GNUNET_free (fhc);
+}
+
+
+
+/* ***************** binary-ASCII encoding *************** */
static unsigned int
getValue__ (unsigned char a)
* small number of characters. The GNUnet encoding uses 102
* characters plus a null terminator.
*
- * @param block the GNUNET_CRYPTO_hash code
+ * @param block the hash code
* @param result where to store the encoding (struct GNUNET_CRYPTO_HashAsciiEncoded can be
- * safely cast to char*, a '\0' termination is set).
+ * safely cast to char*, a '\\0' termination is set).
*/
void
GNUNET_CRYPTO_hash_to_enc (const GNUNET_HashCode * block,
struct GNUNET_CRYPTO_HashAsciiEncoded *result)
{
+ /**
+ * 32 characters for encoding (GNUNET_CRYPTO_hash => 32 characters)
+ */
+ static char *encTable__ = "0123456789ABCDEFGHIJKLMNOPQRSTUV";
unsigned int wpos;
unsigned int rpos;
unsigned int bits;
* fast, not involve bits[0] or bits[4] (they're used elsewhere), and be
* somewhat consistent. And of course, the result should be a positive
* number.
- *
- * @returns a positive number which is a measure for
+ *
+ * @param a some hash code
+ * @param b some hash code
+ * @return a positive number which is a measure for
* hashcode proximity.
*/
unsigned int
}
void
-GNUNET_CRYPTO_hash_create_random (GNUNET_HashCode * result)
+GNUNET_CRYPTO_hash_create_random (enum GNUNET_CRYPTO_Quality mode,
+ GNUNET_HashCode * result)
{
int i;
- for (i = (sizeof (GNUNET_HashCode) / sizeof (unsigned int)) - 1; i >= 0;
- i--)
- result->bits[i] = rand ();
+ for (i = (sizeof (GNUNET_HashCode) / sizeof (uint32_t)) - 1; i >= 0; i--)
+ result->bits[i] = GNUNET_CRYPTO_random_u32 (mode, UINT32_MAX);
}
void
result->bits[i] = delta->bits[i] + a->bits[i];
}
+
void
GNUNET_CRYPTO_hash_xor (const GNUNET_HashCode * a,
- const GNUNET_HashCode * b, GNUNET_HashCode * result)
+ const GNUNET_HashCode * b,
+ GNUNET_HashCode * result)
{
int i;
for (i = (sizeof (GNUNET_HashCode) / sizeof (unsigned int)) - 1; i >= 0;
result->bits[i] = a->bits[i] ^ b->bits[i];
}
+
/**
* Convert a hashcode into a key.
*/
void
-GNUNET_CRYPTO_hash_to_AES_key (const GNUNET_HashCode * hc,
+GNUNET_CRYPTO_hash_to_aes_key (const GNUNET_HashCode * hc,
struct GNUNET_CRYPTO_AesSessionKey *skey,
struct GNUNET_CRYPTO_AesInitializationVector
*iv)
sizeof (struct GNUNET_CRYPTO_AesInitializationVector));
}
+
/**
* Obtain a bit from a hashcode.
* @param code the GNUNET_CRYPTO_hash to index bit-wise
* @return Bit \a bit from hashcode \a code, -1 for invalid index
*/
int
-GNUNET_CRYPTO_hash_get_bit (const GNUNET_HashCode * code, unsigned int bit)
+GNUNET_CRYPTO_hash_get_bit (const GNUNET_HashCode * code,
+ unsigned int bit)
{
GNUNET_assert (bit < 8 * sizeof (GNUNET_HashCode));
return (((unsigned char *) code)[bit >> 3] & (1 << (bit & 7))) > 0;
}
+/**
+ * Determine how many low order bits match in two
+ * GNUNET_HashCodes. i.e. - 010011 and 011111 share
+ * the first two lowest order bits, and therefore the
+ * return value is two (NOT XOR distance, nor how many
+ * bits match absolutely!).
+ *
+ * @param first the first hashcode
+ * @param second the hashcode to compare first to
+ *
+ * @return the number of bits that match
+ */
+unsigned int
+GNUNET_CRYPTO_hash_matching_bits(const GNUNET_HashCode *first,
+ const GNUNET_HashCode *second)
+{
+ unsigned int i;
+
+ for (i = 0; i < sizeof (GNUNET_HashCode) * 8; i++)
+ if (GNUNET_CRYPTO_hash_get_bit (first, i) != GNUNET_CRYPTO_hash_get_bit (second, i))
+ return i;
+ return sizeof (GNUNET_HashCode) * 8;
+}
+
+
/**
* Compare function for HashCodes, producing a total ordering
* of all hashcodes.
return 0;
}
+
/**
* Find out which of the two GNUNET_CRYPTO_hash codes is closer to target
* in the XOR metric (Kademlia).
return 0;
}
-/* end of hashing.c */
+
+/**
+ * @brief Derive an authentication key
+ * @param key authentication key
+ * @param rkey root key
+ * @param salt salt
+ * @param salt_len size of the salt
+ * @param ... pair of void * & size_t for context chunks, terminated by NULL
+ */
+void
+GNUNET_CRYPTO_hmac_derive_key(struct GNUNET_CRYPTO_AuthKey *key,
+ const struct GNUNET_CRYPTO_AesSessionKey *rkey,
+ const void *salt,
+ size_t salt_len,
+ ...)
+{
+ va_list argp;
+
+ va_start (argp, salt_len);
+ GNUNET_CRYPTO_hmac_derive_key_v (key, rkey, salt, salt_len, argp);
+ va_end (argp);
+}
+
+
+/**
+ * @brief Derive an authentication key
+ * @param key authentication key
+ * @param rkey root key
+ * @param salt salt
+ * @param salt_len size of the salt
+ * @param argp pair of void * & size_t for context chunks, terminated by NULL
+ */
+void
+GNUNET_CRYPTO_hmac_derive_key_v(struct GNUNET_CRYPTO_AuthKey *key,
+ const struct GNUNET_CRYPTO_AesSessionKey *rkey,
+ const void *salt,
+ size_t salt_len,
+ va_list argp)
+{
+ GNUNET_CRYPTO_kdf_v (key->key,
+ sizeof(key->key),
+ salt, salt_len,
+ rkey->key,
+ sizeof(rkey->key),
+ argp);
+}
+
+
+/**
+ * Calculate HMAC of a message (RFC 2104)
+ *
+ * @param key secret key
+ * @param plaintext input plaintext
+ * @param plaintext_len length of plaintext
+ * @param hmac where to store the hmac
+ */
+void
+GNUNET_CRYPTO_hmac (const struct GNUNET_CRYPTO_AuthKey *key,
+ const void *plaintext,
+ size_t plaintext_len,
+ GNUNET_HashCode *hmac)
+{
+ gcry_md_hd_t md;
+ const unsigned char *mc;
+
+ GNUNET_assert (GPG_ERR_NO_ERROR == gcry_md_open (&md,
+ GCRY_MD_SHA512,
+ GCRY_MD_FLAG_HMAC));
+ gcry_md_setkey (md, key->key, sizeof(key->key));
+ gcry_md_write (md, plaintext, plaintext_len);
+ mc = gcry_md_read (md, GCRY_MD_SHA512);
+ if (mc != NULL)
+ memcpy (hmac->bits, mc, sizeof(hmac->bits));
+ gcry_md_close (md);
+}
+
+
+/* end of crypto_hash.c */