/*
This file is part of GNUnet.
- (C) 2001, 2002, 2003, 2004, 2005, 2006, 2009 Christian Grothoff (and other contributing authors)
+ (C) 2001, 2002, 2003, 2004, 2005, 2006, 2009, 2012 Christian Grothoff (and other contributing authors)
GNUnet is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published
#include "gnunet_common.h"
#include "gnunet_crypto_lib.h"
#include "gnunet_disk_lib.h"
+#include "gnunet_strings_lib.h"
#include <gcrypt.h>
+#define LOG(kind,...) GNUNET_log_from (kind, "util", __VA_ARGS__)
+
+#define LOG_STRERROR_FILE(kind,syscall,filename) GNUNET_log_from_strerror_file (kind, "util", syscall, filename)
/**
* Hash block of given size.
* @param ret pointer to where to write the hashcode
*/
void
-GNUNET_CRYPTO_hash (const void *block, size_t size, GNUNET_HashCode * ret)
+GNUNET_CRYPTO_hash (const void *block, size_t size, struct GNUNET_HashCode * ret)
{
gcry_md_hash_buffer (GCRY_MD_SHA512, ret, block, size);
}
+/**
+ * Compute short (256-bit) hash of a given block.
+ *
+ * @param block the data to GNUNET_CRYPTO_hash, length is given as a second argument
+ * @param size the length of the data to GNUNET_CRYPTO_hash
+ * @param ret pointer to where to write the hashcode
+ */
+void
+GNUNET_CRYPTO_short_hash (const void *block, size_t size,
+ struct GNUNET_CRYPTO_ShortHashCode * ret)
+{
+ gcry_md_hash_buffer (GCRY_MD_SHA256, ret, block, size);
+}
+
+
/**
* Context used when hashing a file.
*/
*/
struct GNUNET_DISK_FileHandle *fh;
- /**
- * Our scheduler.
- */
- struct GNUNET_SCHEDULER_Handle *sched;
-
/**
* Cummulated hash.
*/
*/
GNUNET_SCHEDULER_TaskIdentifier task;
+ /**
+ * Priority we use.
+ */
+ enum GNUNET_SCHEDULER_Priority priority;
+
/**
* Blocksize.
*/
* and free associated resources.
*/
static void
-file_hash_finish (struct GNUNET_CRYPTO_FileHashContext *fhc,
- const GNUNET_HashCode * res)
+file_hash_finish (struct GNUNET_CRYPTO_FileHashContext *fhc,
+ const struct GNUNET_HashCode * res)
{
fhc->callback (fhc->callback_cls, res);
GNUNET_free (fhc->filename);
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 */
}
file_hash_task (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
{
struct GNUNET_CRYPTO_FileHashContext *fhc = cls;
- GNUNET_HashCode *res;
+ struct GNUNET_HashCode *res;
size_t delta;
fhc->task = GNUNET_SCHEDULER_NO_TASK;
- GNUNET_assert (fhc->offset < fhc->fsize);
+ GNUNET_assert (fhc->offset <= fhc->fsize);
delta = fhc->bsize;
if (fhc->fsize - fhc->offset < delta)
delta = fhc->fsize - fhc->offset;
if (delta != GNUNET_DISK_file_read (fhc->fh, fhc->buffer, delta))
- {
- GNUNET_log_strerror_file (GNUNET_ERROR_TYPE_WARNING,
- "read", fhc->filename);
- file_hash_finish (fhc, NULL);
- return;
- }
+ {
+ LOG_STRERROR_FILE (GNUNET_ERROR_TYPE_WARNING, "read", fhc->filename);
+ file_hash_finish (fhc, NULL);
+ return;
+ }
gcry_md_write (fhc->md, fhc->buffer, delta);
fhc->offset += delta;
if (fhc->offset == fhc->fsize)
- {
- res = (GNUNET_HashCode *) gcry_md_read (fhc->md, GCRY_MD_SHA512);
- file_hash_finish (fhc, &res);
- gcry_md_close (fhc->md);
- return;
- }
- fhc->task
- = GNUNET_SCHEDULER_add_after (tc->sched,
- GNUNET_SCHEDULER_NO_TASK,
- &file_hash_task, fhc);
+ {
+ res = (struct GNUNET_HashCode *) gcry_md_read (fhc->md, GCRY_MD_SHA512);
+ file_hash_finish (fhc, res);
+ return;
+ }
+ fhc->task = GNUNET_SCHEDULER_add_with_priority (fhc->priority,
+ &file_hash_task, fhc);
}
/**
* Compute the hash of an entire file.
*
- * @param sched scheduler to use
* @param priority scheduling priority to use
* @param filename name of file to hash
* @param blocksize number of bytes to process in one task
* @return NULL on (immediate) errror
*/
struct GNUNET_CRYPTO_FileHashContext *
-GNUNET_CRYPTO_hash_file (struct GNUNET_SCHEDULER_Handle *sched,
- enum GNUNET_SCHEDULER_Priority priority,
- const char *filename,
- size_t blocksize,
+GNUNET_CRYPTO_hash_file (enum GNUNET_SCHEDULER_Priority priority,
+ const char *filename, size_t blocksize,
GNUNET_CRYPTO_HashCompletedCallback callback,
void *callback_cls)
{
struct GNUNET_CRYPTO_FileHashContext *fhc;
GNUNET_assert (blocksize > 0);
- fhc = GNUNET_malloc (sizeof (struct GNUNET_CRYPTO_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->md = gcry_md_open (&fhc->md, GCRY_MD_SHA512, 0);
+ 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))
- {
- GNUNET_free (fhc->filename);
- GNUNET_free (fhc);
- return NULL;
- }
- fhc->fh = GNUNET_DISK_file_open (filename,
- GNUNET_DISK_OPEN_READ,
- GNUNET_DISK_PERM_NONE);
+ if (GNUNET_OK != GNUNET_DISK_file_size (filename, &fhc->fsize, GNUNET_NO, GNUNET_YES))
+ {
+ GNUNET_free (fhc->filename);
+ GNUNET_free (fhc);
+ return NULL;
+ }
+ fhc->fh =
+ GNUNET_DISK_file_open (filename, GNUNET_DISK_OPEN_READ,
+ GNUNET_DISK_PERM_NONE);
if (!fhc->fh)
- {
- GNUNET_free (fhc->filename);
- GNUNET_free (fhc);
- return NULL;
- }
- fhc->task
- = GNUNET_SCHEDULER_add_with_priority (sched, priority,
- &file_hash_task, fhc);
+ {
+ GNUNET_free (fhc->filename);
+ GNUNET_free (fhc);
+ return NULL;
+ }
+ fhc->priority = priority;
+ fhc->task =
+ GNUNET_SCHEDULER_add_with_priority (priority, &file_hash_task, fhc);
return fhc;
}
void
GNUNET_CRYPTO_hash_file_cancel (struct GNUNET_CRYPTO_FileHashContext *fhc)
{
- GNUNET_SCHEDULER_cancel (fhc->sched,
- fhc->task);
+ GNUNET_SCHEDULER_cancel (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)
-{
- if ((a >= '0') && (a <= '9'))
- return a - '0';
- if ((a >= 'A') && (a <= 'V'))
- return (a - 'A' + 10);
- return -1;
-}
/**
* Convert GNUNET_CRYPTO_hash to ASCII encoding. The ASCII encoding is rather
* GNUnet specific. It was chosen such that it only uses characters
* in [0-9A-V], can be produced without complex arithmetics and uses a
- * small number of characters. The GNUnet encoding uses 102
+ * small number of characters. The GNUnet encoding uses 103
* characters plus a null terminator.
*
* @param block the hash code
* safely cast to char*, a '\\0' termination is set).
*/
void
-GNUNET_CRYPTO_hash_to_enc (const GNUNET_HashCode * block,
+GNUNET_CRYPTO_hash_to_enc (const struct 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;
- unsigned int vbit;
-
- GNUNET_assert (block != NULL);
- GNUNET_assert (result != NULL);
- vbit = 0;
- wpos = 0;
- rpos = 0;
- bits = 0;
- while ((rpos < sizeof (GNUNET_HashCode)) || (vbit > 0))
- {
- if ((rpos < sizeof (GNUNET_HashCode)) && (vbit < 5))
- {
- bits = (bits << 8) | ((unsigned char *) block)[rpos++]; /* eat 8 more bits */
- vbit += 8;
- }
- if (vbit < 5)
- {
- bits <<= (5 - vbit); /* zero-padding */
- GNUNET_assert (vbit == 2); /* padding by 3: 512+3 mod 5 == 0 */
- vbit = 5;
- }
- GNUNET_assert (wpos <
- sizeof (struct GNUNET_CRYPTO_HashAsciiEncoded) - 1);
- result->encoding[wpos++] = encTable__[(bits >> (vbit - 5)) & 31];
- vbit -= 5;
- }
- GNUNET_assert (wpos == sizeof (struct GNUNET_CRYPTO_HashAsciiEncoded) - 1);
- GNUNET_assert (vbit == 0);
- result->encoding[wpos] = '\0';
+ char *np;
+
+ np = GNUNET_STRINGS_data_to_string ((const unsigned char *) block,
+ sizeof (struct GNUNET_HashCode),
+ (char*) result,
+ sizeof (struct GNUNET_CRYPTO_HashAsciiEncoded) - 1);
+ GNUNET_assert (NULL != np);
+ *np = '\0';
}
+
/**
- * Convert ASCII encoding back to GNUNET_CRYPTO_hash
+ * Convert ASCII encoding back to hash code.
*
* @param enc the encoding
- * @param result where to store the GNUNET_CRYPTO_hash code
+ * @param enclen number of characters in 'enc' (without 0-terminator, which can be missing)
+ * @param result where to store the hash code
* @return GNUNET_OK on success, GNUNET_SYSERR if result has the wrong encoding
*/
int
-GNUNET_CRYPTO_hash_from_string (const char *enc, GNUNET_HashCode * result)
+GNUNET_CRYPTO_hash_from_string2 (const char *enc, size_t enclen,
+ struct GNUNET_HashCode * result)
{
- unsigned int rpos;
- unsigned int wpos;
- unsigned int bits;
- unsigned int vbit;
+ char upper_enc[enclen];
+ char* up_ptr = upper_enc;
- if (strlen (enc) != sizeof (struct GNUNET_CRYPTO_HashAsciiEncoded) - 1)
- return GNUNET_SYSERR;
+ GNUNET_STRINGS_utf8_toupper(enc, &up_ptr);
- vbit = 2; /* padding! */
- wpos = sizeof (GNUNET_HashCode);
- rpos = sizeof (struct GNUNET_CRYPTO_HashAsciiEncoded) - 1;
- bits = getValue__ (enc[--rpos]) >> 3;
- while (wpos > 0)
- {
- GNUNET_assert (rpos > 0);
- bits = (getValue__ (enc[--rpos]) << vbit) | bits;
- vbit += 5;
- if (vbit >= 8)
- {
- ((unsigned char *) result)[--wpos] = (unsigned char) bits;
- bits >>= 8;
- vbit -= 8;
- }
- }
- GNUNET_assert (rpos == 0);
- GNUNET_assert (vbit == 0);
- return GNUNET_OK;
+ return GNUNET_STRINGS_string_to_data (upper_enc, enclen,
+ (unsigned char*) result,
+ sizeof (struct GNUNET_HashCode));
}
+
/**
* Compute the distance between 2 hashcodes. The computation must be
* 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.
- *
+ *
* @param a some hash code
* @param b some hash code
* @return a positive number which is a measure for
* hashcode proximity.
*/
unsigned int
-GNUNET_CRYPTO_hash_distance_u32 (const GNUNET_HashCode * a,
- const GNUNET_HashCode * b)
+GNUNET_CRYPTO_hash_distance_u32 (const struct GNUNET_HashCode * a,
+ const struct GNUNET_HashCode * b)
{
unsigned int x1 = (a->bits[1] - b->bits[1]) >> 16;
unsigned int x2 = (b->bits[1] - a->bits[1]) >> 16;
+
return (x1 * x2);
}
+
+/**
+ * Create a random hash code.
+ *
+ * @param mode desired quality level
+ * @param result hash code that is randomized
+ */
void
GNUNET_CRYPTO_hash_create_random (enum GNUNET_CRYPTO_Quality mode,
- GNUNET_HashCode * result)
+ struct GNUNET_HashCode *result)
{
int i;
- for (i = (sizeof (GNUNET_HashCode) / sizeof (uint32_t)) - 1; i >= 0; i--)
+
+ for (i = (sizeof (struct GNUNET_HashCode) / sizeof (uint32_t)) - 1; i >= 0; i--)
result->bits[i] = GNUNET_CRYPTO_random_u32 (mode, UINT32_MAX);
}
+
+/**
+ * compute result(delta) = b - a
+ *
+ * @param a some hash code
+ * @param b some hash code
+ * @param result set to b - a
+ */
void
-GNUNET_CRYPTO_hash_difference (const GNUNET_HashCode * a,
- const GNUNET_HashCode * b,
- GNUNET_HashCode * result)
+GNUNET_CRYPTO_hash_difference (const struct GNUNET_HashCode * a,
+ const struct GNUNET_HashCode * b,
+ struct GNUNET_HashCode * result)
{
int i;
- for (i = (sizeof (GNUNET_HashCode) / sizeof (unsigned int)) - 1; i >= 0;
- i--)
+
+ for (i = (sizeof (struct GNUNET_HashCode) / sizeof (unsigned int)) - 1; i >= 0; i--)
result->bits[i] = b->bits[i] - a->bits[i];
}
+
+/**
+ * compute result(b) = a + delta
+ *
+ * @param a some hash code
+ * @param delta some hash code
+ * @param result set to a + delta
+ */
void
-GNUNET_CRYPTO_hash_sum (const GNUNET_HashCode * a,
- const GNUNET_HashCode * delta,
- GNUNET_HashCode * result)
+GNUNET_CRYPTO_hash_sum (const struct GNUNET_HashCode * a,
+ const struct GNUNET_HashCode * delta, struct GNUNET_HashCode * result)
{
int i;
- for (i = (sizeof (GNUNET_HashCode) / sizeof (unsigned int)) - 1; i >= 0;
- i--)
+
+ for (i = (sizeof (struct GNUNET_HashCode) / sizeof (unsigned int)) - 1; i >= 0; i--)
result->bits[i] = delta->bits[i] + a->bits[i];
}
+
+/**
+ * compute result = a ^ b
+ *
+ * @param a some hash code
+ * @param b some hash code
+ * @param result set to a ^ b
+ */
void
-GNUNET_CRYPTO_hash_xor (const GNUNET_HashCode * a,
- const GNUNET_HashCode * b, GNUNET_HashCode * result)
+GNUNET_CRYPTO_hash_xor (const struct GNUNET_HashCode * a, const struct GNUNET_HashCode * b,
+ struct GNUNET_HashCode * result)
{
int i;
- for (i = (sizeof (GNUNET_HashCode) / sizeof (unsigned int)) - 1; i >= 0;
- i--)
+
+ for (i = (sizeof (struct GNUNET_HashCode) / sizeof (unsigned int)) - 1; i >= 0; i--)
result->bits[i] = a->bits[i] ^ b->bits[i];
}
+
/**
* Convert a hashcode into a key.
+ *
+ * @param hc hash code that serves to generate the key
+ * @param skey set to a valid session key
+ * @param iv set to a valid initialization vector
*/
void
-GNUNET_CRYPTO_hash_to_aes_key (const GNUNET_HashCode * hc,
+GNUNET_CRYPTO_hash_to_aes_key (const struct GNUNET_HashCode * hc,
struct GNUNET_CRYPTO_AesSessionKey *skey,
- struct GNUNET_CRYPTO_AesInitializationVector
- *iv)
+ struct GNUNET_CRYPTO_AesInitializationVector *iv)
{
- GNUNET_assert (sizeof (GNUNET_HashCode) >=
+ GNUNET_assert (sizeof (struct GNUNET_HashCode) >=
GNUNET_CRYPTO_AES_KEY_LENGTH +
sizeof (struct GNUNET_CRYPTO_AesInitializationVector));
memcpy (skey, hc, GNUNET_CRYPTO_AES_KEY_LENGTH);
- skey->crc32 =
- htonl (GNUNET_CRYPTO_crc32_n (skey, GNUNET_CRYPTO_AES_KEY_LENGTH));
memcpy (iv, &((char *) hc)[GNUNET_CRYPTO_AES_KEY_LENGTH],
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 struct GNUNET_HashCode * code, unsigned int bit)
{
- GNUNET_assert (bit < 8 * sizeof (GNUNET_HashCode));
+ GNUNET_assert (bit < 8 * sizeof (struct 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
+ * struct 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!).
*
* @return the number of bits that match
*/
-unsigned int GNUNET_CRYPTO_hash_matching_bits(const GNUNET_HashCode *first, const GNUNET_HashCode *second)
+unsigned int
+GNUNET_CRYPTO_hash_matching_bits (const struct GNUNET_HashCode * first,
+ const struct 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))
+ for (i = 0; i < sizeof (struct 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;
+ return sizeof (struct GNUNET_HashCode) * 8;
}
+
/**
* Compare function for HashCodes, producing a total ordering
* of all hashcodes.
+ *
+ * @param h1 some hash code
+ * @param h2 some hash code
* @return 1 if h1 > h2, -1 if h1 < h2 and 0 if h1 == h2.
*/
int
-GNUNET_CRYPTO_hash_cmp (const GNUNET_HashCode * h1,
- const GNUNET_HashCode * h2)
+GNUNET_CRYPTO_hash_cmp (const struct GNUNET_HashCode * h1, const struct GNUNET_HashCode * h2)
{
unsigned int *i1;
unsigned int *i2;
i1 = (unsigned int *) h1;
i2 = (unsigned int *) h2;
- for (i = (sizeof (GNUNET_HashCode) / sizeof (unsigned int)) - 1; i >= 0;
- i--)
- {
- if (i1[i] > i2[i])
- return 1;
- if (i1[i] < i2[i])
- return -1;
- }
+ for (i = (sizeof (struct GNUNET_HashCode) / sizeof (unsigned int)) - 1; i >= 0; i--)
+ {
+ if (i1[i] > i2[i])
+ return 1;
+ if (i1[i] < i2[i])
+ return -1;
+ }
return 0;
}
+
/**
* Find out which of the two GNUNET_CRYPTO_hash codes is closer to target
* in the XOR metric (Kademlia).
+ *
+ * @param h1 some hash code
+ * @param h2 some hash code
+ * @param target some hash code
* @return -1 if h1 is closer, 1 if h2 is closer and 0 if h1==h2.
*/
int
-GNUNET_CRYPTO_hash_xorcmp (const GNUNET_HashCode * h1,
- const GNUNET_HashCode * h2,
- const GNUNET_HashCode * target)
+GNUNET_CRYPTO_hash_xorcmp (const struct GNUNET_HashCode * h1,
+ const struct GNUNET_HashCode * h2,
+ const struct GNUNET_HashCode * target)
{
int i;
unsigned int d1;
unsigned int d2;
- for (i = sizeof (GNUNET_HashCode) / sizeof (unsigned int) - 1; i >= 0; i--)
- {
- d1 = ((unsigned int *) h1)[i] ^ ((unsigned int *) target)[i];
- d2 = ((unsigned int *) h2)[i] ^ ((unsigned int *) target)[i];
- if (d1 > d2)
- return 1;
- else if (d1 < d2)
- return -1;
- }
+ for (i = sizeof (struct GNUNET_HashCode) / sizeof (unsigned int) - 1; i >= 0; i--)
+ {
+ d1 = ((unsigned int *) h1)[i] ^ ((unsigned int *) target)[i];
+ d2 = ((unsigned int *) h2)[i] ^ ((unsigned int *) target)[i];
+ if (d1 > d2)
+ return 1;
+ else if (d1 < d2)
+ return -1;
+ }
return 0;
}
* @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,
- const size_t salt_len,
- ...)
+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;
* @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,
- const size_t salt_len,
- va_list argp)
+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);
+ 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 plaintext_len length of plaintext
* @param hmac where to store the hmac
*/
-void
+void
GNUNET_CRYPTO_hmac (const struct GNUNET_CRYPTO_AuthKey *key,
- const void *plaintext,
- size_t plaintext_len,
- GNUNET_HashCode *hmac)
+ const void *plaintext, size_t plaintext_len,
+ struct GNUNET_HashCode * hmac)
{
gcry_md_hd_t md;
- unsigned char *mc;
+ const unsigned char *mc;
- md = gcry_md_open (&md, GCRY_MD_SHA512, GCRY_MD_FLAG_HMAC);
- gcry_md_setkey (md, key->key, sizeof(key->key));
+ 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));
+ memcpy (hmac->bits, mc, sizeof (hmac->bits));
gcry_md_close (md);
}
+
+/**
+ * Double short (256-bit) hash to create a long hash.
+ *
+ * @param sh short hash to double
+ * @param dh where to store the (doubled) long hash (not really a hash)
+ */
+void
+GNUNET_CRYPTO_short_hash_double (const struct GNUNET_CRYPTO_ShortHashCode *sh,
+ struct GNUNET_HashCode *dh)
+{
+ char *ptr;
+
+ ptr = (char*) dh;
+ memcpy (ptr, sh, sizeof (struct GNUNET_CRYPTO_ShortHashCode));
+ memcpy (&ptr[sizeof (struct GNUNET_CRYPTO_ShortHashCode)], sh, sizeof (struct GNUNET_CRYPTO_ShortHashCode));
+}
+
+
+/**
+ * Truncate doubled short hash back to a short hash.
+ *
+ * @param dh doubled short hash to reduce again
+ * @param sh where to store the short hash
+ * @return GNUNET_OK on success, GNUNET_SYSERR if this was not a
+ * doubled short hash
+ */
+int
+GNUNET_CRYPTO_short_hash_from_truncation (const struct GNUNET_HashCode *dh,
+ struct GNUNET_CRYPTO_ShortHashCode *sh)
+{
+ const struct GNUNET_CRYPTO_ShortHashCode *s;
+
+ s = (const struct GNUNET_CRYPTO_ShortHashCode *) dh;
+ if (0 != memcmp (&s[0],
+ &s[1],
+ sizeof (struct GNUNET_CRYPTO_ShortHashCode)))
+ return GNUNET_SYSERR;
+ *sh = *s;
+ return GNUNET_OK;
+}
+
+
+/**
+ * Convert ASCII encoding back to a 'struct GNUNET_CRYPTO_ShortHash'
+ *
+ * @param enc the encoding
+ * @param enclen number of characters in 'enc' (without 0-terminator, which can be missing)
+ * @param result where to store the GNUNET_CRYPTO_hash code
+ * @return GNUNET_OK on success, GNUNET_SYSERR if result has the wrong encoding
+ */
+int
+GNUNET_CRYPTO_short_hash_from_string2 (const char *enc, size_t enclen,
+ struct GNUNET_CRYPTO_ShortHashCode * result)
+{
+
+ char upper_enc[enclen];
+ char* up_ptr = upper_enc;
+
+ GNUNET_STRINGS_utf8_toupper(enc, &up_ptr);
+ return GNUNET_STRINGS_string_to_data (upper_enc, enclen,
+ (unsigned char*) result,
+ sizeof (struct GNUNET_CRYPTO_ShortHashCode));
+}
+
+
+/**
+ * Convert short hash to ASCII encoding.
+ *
+ * @param block the hash code
+ * @param result where to store the encoding (struct GNUNET_CRYPTO_ShortHashAsciiEncoded can be
+ * safely cast to char*, a '\\0' termination is set).
+ */
+void
+GNUNET_CRYPTO_short_hash_to_enc (const struct GNUNET_CRYPTO_ShortHashCode * block,
+ struct GNUNET_CRYPTO_ShortHashAsciiEncoded *result)
+{
+ char *np;
+
+ np = GNUNET_STRINGS_data_to_string ((const unsigned char *) block,
+ sizeof (struct GNUNET_CRYPTO_ShortHashCode),
+ (char*) result,
+ sizeof (struct GNUNET_CRYPTO_ShortHashAsciiEncoded) - 1);
+ GNUNET_assert (NULL != np);
+ *np = '\0';
+}
+
+/**
+ * Compare function for ShortHashCodes, producing a total ordering
+ * of all hashcodes.
+ *
+ * @param h1 some hash code
+ * @param h2 some hash code
+ * @return 1 if h1 > h2, -1 if h1 < h2 and 0 if h1 == h2.
+ */
+int
+GNUNET_CRYPTO_short_hash_cmp (const struct GNUNET_CRYPTO_ShortHashCode * h1,
+ const struct GNUNET_CRYPTO_ShortHashCode * h2)
+{
+ unsigned int *i1;
+ unsigned int *i2;
+ int i;
+
+ i1 = (unsigned int *) h1;
+ i2 = (unsigned int *) h2;
+ for (i = (sizeof (struct GNUNET_CRYPTO_ShortHashCode) / sizeof (unsigned int)) - 1; i >= 0; i--)
+ {
+ if (i1[i] > i2[i])
+ return 1;
+ if (i1[i] < i2[i])
+ return -1;
+ }
+ return 0;
+}
+
/* end of crypto_hash.c */
projects / oweals / gnunet.git / blobdiff