header for crypto_ope.c More...

#include "orconfig.h"
#include "lib/cc/torint.h"
#include "lib/crypt_ops/crypto_ope.h"
#include "lib/testsupport/testsupport.h"

Macros
#define	OPE_KEY_LEN 32

#define	OPE_INPUT_MAX (1<<18)

#define	CRYPTO_OPE_ERROR UINT64_MAX

#define	crypto_ope_free(ope) FREE_AND_NULL(crypto_ope_t, crypto_ope_free_, (ope))

Functions
crypto_ope_t *	crypto_ope_new (const uint8_t *key)

void	crypto_ope_free_ (crypto_ope_t *ope)

uint64_t	crypto_ope_encrypt (const crypto_ope_t *ope, int plaintext)

Detailed Description

header for crypto_ope.c

Definition in file crypto_ope.h.

Macro Definition Documentation

◆ OPE_INPUT_MAX

#define OPE_INPUT_MAX (1<<18)

Largest value that can be passed to crypto_ope_encrypt().

Expressed as 2^18 because the OPE system prefers powers of two.

The current max value stands for about 70 hours. The rationale here is as follows: The rev counter is the time of seconds since the start of an SRV period. SRVs are useful for about 48 hours (that's how long they stick around on the consensus). Let's also add 12 hours of drift for clock skewed services that might be using an old consensus and we arrive to 60 hours. The max value should be beyond that.

Definition at line 31 of file crypto_ope.h.

◆ OPE_KEY_LEN

#define OPE_KEY_LEN 32

Length of OPE key, in bytes.

Definition at line 18 of file crypto_ope.h.

Function Documentation

◆ crypto_ope_encrypt()

uint64_t crypto_ope_encrypt	(	const crypto_ope_t *	ope,
		int	plaintext
	)

Return the encrypted value corresponding to input. The input value must be in range 1..OPE_INPUT_MAX. Returns CRYPTO_OPE_ERROR on an invalid input.

NOTE: this function is not constant-time.

Definition at line 165 of file crypto_ope.c.

◆ crypto_ope_free_()

void crypto_ope_free_ ( crypto_ope_t * ope )

Free all storage held in ope.

Definition at line 149 of file crypto_ope.c.

◆ crypto_ope_new()

crypto_ope_t* crypto_ope_new ( const uint8_t * key )

Return a new crypto_ope_t object, using the provided 256-bit key.

Definition at line 129 of file crypto_ope.c.

Macros

Functions