crypto_hash.c File Reference

SHA-512 GNUNET_CRYPTO_hash() related functions. More...

#include "platform.h"
#include "gnunet_crypto_lib.h"
#include "gnunet_strings_lib.h"
#include "benchmark.h"
#include <gcrypt.h>

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Data Structures
struct	GNUNET_HashContext

Macros
#define	LOG(kind, ...)   GNUNET_log_from (kind, "util-crypto-hash", __VA_ARGS__)
#define	LOG_STRERROR_FILE(kind, syscall, filename)

Functions
void	GNUNET_CRYPTO_hash (const void *block, size_t size, struct GNUNET_HashCode *ret)
	Compute hash of a given block. More...
void	GNUNET_CRYPTO_hash_to_enc (const struct GNUNET_HashCode *block, struct GNUNET_CRYPTO_HashAsciiEncoded *result)
	Convert hash to ASCII encoding. More...
enum GNUNET_GenericReturnValue	GNUNET_CRYPTO_hash_from_string2 (const char *enc, size_t enclen, struct GNUNET_HashCode *result)
	Convert ASCII encoding back to a 'struct GNUNET_HashCode'. More...
unsigned int	GNUNET_CRYPTO_hash_distance_u32 (const struct GNUNET_HashCode *a, const struct GNUNET_HashCode *b)
	Compute the distance between 2 hashcodes. More...
void	GNUNET_CRYPTO_hash_create_random (enum GNUNET_CRYPTO_Quality mode, struct GNUNET_HashCode *result)
	Create a random hash code. More...
void	GNUNET_CRYPTO_hash_difference (const struct GNUNET_HashCode *a, const struct GNUNET_HashCode *b, struct GNUNET_HashCode *result)
	compute result = b - a More...
void	GNUNET_CRYPTO_hash_sum (const struct GNUNET_HashCode *a, const struct GNUNET_HashCode *delta, struct GNUNET_HashCode *result)
	compute result = a + delta More...
void	GNUNET_CRYPTO_hash_xor (const struct GNUNET_HashCode *a, const struct GNUNET_HashCode *b, struct GNUNET_HashCode *result)
	compute result = a ^ b More...
void	GNUNET_CRYPTO_hash_to_aes_key (const struct GNUNET_HashCode *hc, struct GNUNET_CRYPTO_SymmetricSessionKey *skey, struct GNUNET_CRYPTO_SymmetricInitializationVector *iv)
	Convert a hashcode into a key. More...
int	GNUNET_CRYPTO_hash_get_bit_ltr (const struct GNUNET_HashCode *code, unsigned int bit)
	Obtain a bit from a hashcode. More...
int	GNUNET_CRYPTO_hash_get_bit_rtl (const struct GNUNET_HashCode *code, unsigned int bit)
	Obtain a bit from a hashcode. More...
unsigned int	GNUNET_CRYPTO_hash_matching_bits (const struct GNUNET_HashCode *first, const struct GNUNET_HashCode *second)
	Determine how many low order bits match in two struct GNUNET_HashCodes. More...
int	GNUNET_CRYPTO_hash_cmp (const struct GNUNET_HashCode *h1, const struct GNUNET_HashCode *h2)
	Compare function for HashCodes, producing a total ordering of all hashcodes. More...
int	GNUNET_CRYPTO_hash_xorcmp (const struct GNUNET_HashCode *h1, const struct GNUNET_HashCode *h2, const struct GNUNET_HashCode *target)
	Find out which of the two GNUNET_CRYPTO_hash codes is closer to target in the XOR metric (Kademlia). More...
void	GNUNET_CRYPTO_hmac_derive_key (struct GNUNET_CRYPTO_AuthKey *key, const struct GNUNET_CRYPTO_SymmetricSessionKey *rkey, const void *salt, size_t salt_len,...)
	Derive an authentication key. More...
void	GNUNET_CRYPTO_hmac_derive_key_v (struct GNUNET_CRYPTO_AuthKey *key, const struct GNUNET_CRYPTO_SymmetricSessionKey *rkey, const void *salt, size_t salt_len, va_list argp)
	Derive an authentication key. More...
void	GNUNET_CRYPTO_hmac_raw (const void *key, size_t key_len, const void *plaintext, size_t plaintext_len, struct GNUNET_HashCode *hmac)
	Calculate HMAC of a message (RFC 2104) TODO: Shouldn' this be the standard hmac function and the above be renamed? More...
void	GNUNET_CRYPTO_hmac (const struct GNUNET_CRYPTO_AuthKey *key, const void *plaintext, size_t plaintext_len, struct GNUNET_HashCode *hmac)
	Calculate HMAC of a message (RFC 2104) More...
struct GNUNET_HashContext *	GNUNET_CRYPTO_hash_context_start ()
	Start incremental hashing operation. More...
void	GNUNET_CRYPTO_hash_context_read (struct GNUNET_HashContext *hc, const void *buf, size_t size)
	Add data to be hashed. More...
struct GNUNET_HashContext *	GNUNET_CRYPTO_hash_context_copy (const struct GNUNET_HashContext *hc)
	Make a copy of the hash computation. More...
void	GNUNET_CRYPTO_hash_context_finish (struct GNUNET_HashContext *hc, struct GNUNET_HashCode *r_hash)
	Finish the hash computation. More...
void	GNUNET_CRYPTO_hash_context_abort (struct GNUNET_HashContext *hc)
	Abort hashing, do not bother calculating final result. More...

Detailed Description

SHA-512 GNUNET_CRYPTO_hash() related functions.

Author

Christian Grothoff

Definition in file crypto_hash.c.

Macro Definition Documentation

LOG

#define LOG	(		kind,
			...
	)		GNUNET_log_from (kind, "util-crypto-hash", __VA_ARGS__)

Definition at line 32 of file crypto_hash.c.

LOG_STRERROR_FILE

#define LOG_STRERROR_FILE	(		kind,
			syscall,
			filename
	)

Value:

                                                                   GNUNET_log_from_strerror_file (kind, \
                                                                   "util-crypto-hash", \
                                                                   syscall, \
                                                                   filename)

Definition at line 34 of file crypto_hash.c.

Function Documentation

GNUNET_CRYPTO_hash_get_bit_rtl()

int GNUNET_CRYPTO_hash_get_bit_rtl	(	const struct GNUNET_HashCode *	code,
		unsigned int	bit
	)

Obtain a bit from a hashcode.

Parameters

code	the GNUNET_CRYPTO_hash to index bit-wise
bit	index into the hashcode, [0...511] where 0 is the rightmost bit (bytes in code interpreted little endian)

Returns

Bit bit from hashcode code, -1 for invalid index

Definition at line 180 of file crypto_hash.c.

{
  GNUNET_assert (bit < 8 * sizeof(struct GNUNET_HashCode));
  return (((unsigned char *) code)[bit >> 3] & (1 << (bit & 7))) > 0;
}

References GNUNET_assert.

Referenced by get_distance(), and GNUNET_CRYPTO_hash_matching_bits().

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GNUNET_CRYPTO_hmac_raw()

void GNUNET_CRYPTO_hmac_raw	(	const void *	key,
		size_t	key_len,
		const void *	plaintext,
		size_t	plaintext_len,
		struct GNUNET_HashCode *	hmac
	)

Calculate HMAC of a message (RFC 2104) TODO: Shouldn' this be the standard hmac function and the above be renamed?

Parameters

key	secret key
key_len	secret key length
plaintext	input plaintext
plaintext_len	length of plaintext
hmac	where to store the hmac

Definition at line 274 of file crypto_hash.c.

{
  static int once;
  static gcry_md_hd_t md;
  const unsigned char *mc;
 
  if (! once)
  {
    once = 1;
    GNUNET_assert (GPG_ERR_NO_ERROR ==
                   gcry_md_open (&md, GCRY_MD_SHA512, GCRY_MD_FLAG_HMAC));
  }
  else
  {
    gcry_md_reset (md);
  }
  gcry_md_setkey (md, key, key_len);
  gcry_md_write (md, plaintext, plaintext_len);
  mc = gcry_md_read (md, GCRY_MD_SHA512);
  GNUNET_assert (NULL != mc);
  GNUNET_memcpy (hmac->bits, mc, sizeof(hmac->bits));
}

References GNUNET_HashCode::bits, GNUNET_assert, GNUNET_memcpy, key, mc, and once.

Referenced by calculate_hmac(), GNUNET_CRYPTO_hmac(), and OIDC_generate_id_token().

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GNUNET_CRYPTO_hash_context_start()

struct GNUNET_HashContext* GNUNET_CRYPTO_hash_context_start

(

void

)

Start incremental hashing operation.

Returns

context for incremental hash computation

Definition at line 321 of file crypto_hash.c.

{
  struct GNUNET_HashContext *hc;
 
  BENCHMARK_START (hash_context_start);
 
  hc = GNUNET_new (struct GNUNET_HashContext);
  GNUNET_assert (0 ==
                 gcry_md_open (&hc->hd,
                               GCRY_MD_SHA512,
                               0));
 
  BENCHMARK_END (hash_context_start);
 
  return hc;
}

References BENCHMARK_END, BENCHMARK_START, GNUNET_assert, GNUNET_new, and GNUNET_HashContext::hd.

Referenced by create_randomized_element_iterator(), decode_and_send(), GCCH_get_id(), GNUNET_SET_element_hash(), GNUNET_SETI_element_hash(), GNUNET_SETU_element_hash(), and handle_union_p2p_inquiry().

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GNUNET_CRYPTO_hash_context_read()

void GNUNET_CRYPTO_hash_context_read	(	struct GNUNET_HashContext *	hc,
		const void *	buf,
		size_t	size
	)

Add data to be hashed.

Parameters

hc	cumulative hash context
buf	data to add
size	number of bytes in buf

Definition at line 340 of file crypto_hash.c.

{
  BENCHMARK_START (hash_context_read);
  gcry_md_write (hc->hd, buf, size);
  BENCHMARK_END (hash_context_read);
}

References BENCHMARK_END, BENCHMARK_START, buf, GNUNET_HashContext::hd, and size.

Referenced by create_randomized_element_iterator(), decode_and_send(), GCCH_get_id(), GNUNET_SET_element_hash(), GNUNET_SETI_element_hash(), GNUNET_SETU_element_hash(), and handle_union_p2p_inquiry().

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GNUNET_CRYPTO_hash_context_copy()

struct GNUNET_HashContext* GNUNET_CRYPTO_hash_context_copy

(

const struct GNUNET_HashContext *

hc

)

Make a copy of the hash computation.

Parameters

hc	hash context to use (to continue hashing independently)

Returns

copy of hc

Definition at line 351 of file crypto_hash.c.

{
  struct GNUNET_HashContext *cp;
 
  cp = GNUNET_new (struct GNUNET_HashContext);
  GNUNET_assert (0 ==
                 gcry_md_copy (&cp->hd,
                               hc->hd));
  return cp;
}

References GNUNET_assert, GNUNET_new, and GNUNET_HashContext::hd.

GNUNET_CRYPTO_hash_context_finish()

void GNUNET_CRYPTO_hash_context_finish	(	struct GNUNET_HashContext *	hc,
		struct GNUNET_HashCode *	r_hash
	)

Finish the hash computation.

Parameters

hc	hash context to use, is freed in the process
r_hash	where to write the latest / final hash code

Definition at line 364 of file crypto_hash.c.

{
  const void *res = gcry_md_read (hc->hd, 0);
 
  BENCHMARK_START (hash_context_finish);
 
  GNUNET_assert (NULL != res);
  if (NULL != r_hash)
    GNUNET_memcpy (r_hash,
                   res,
                   sizeof(struct GNUNET_HashCode));
  GNUNET_CRYPTO_hash_context_abort (hc);
  BENCHMARK_END (hash_context_finish);
}

References BENCHMARK_END, BENCHMARK_START, GNUNET_assert, GNUNET_CRYPTO_hash_context_abort(), GNUNET_memcpy, GNUNET_HashContext::hd, and res.

Referenced by create_randomized_element_iterator(), decode_and_send(), GCCH_get_id(), GNUNET_SET_element_hash(), GNUNET_SETI_element_hash(), GNUNET_SETU_element_hash(), and handle_union_p2p_inquiry().

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GNUNET_CRYPTO_hash_context_abort()

void GNUNET_CRYPTO_hash_context_abort

(

struct GNUNET_HashContext *

hc

)

Abort hashing, do not bother calculating final result.

Parameters

hc	hash context to destroy

Definition at line 382 of file crypto_hash.c.

{
  gcry_md_close (hc->hd);
  GNUNET_free (hc);
}

References GNUNET_free, and GNUNET_HashContext::hd.

Referenced by GNUNET_CRYPTO_hash_context_finish().

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