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47 lines
1.5 KiB
C
47 lines
1.5 KiB
C
/* Copyright (c) 2018, The Tor Project, Inc. */
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/* See LICENSE for licensing information */
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#ifndef CRYPTO_OPE_H
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#define CRYPTO_OPE_H
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#include "orconfig.h"
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#include "lib/cc/torint.h"
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#include "lib/crypt_ops/crypto_ope.h"
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#include "lib/testsupport/testsupport.h"
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/** Length of OPE key, in bytes. */
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#define OPE_KEY_LEN 32
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/** Largest value that can be passed to crypto_ope_encrypt().
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*
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* Expressed as 2^18 because the OPE system prefers powers of two.
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*
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* The current max value stands for about 70 hours. The rationale here is as
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* follows: The rev counter is the time of seconds since the start of an SRV
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* period. SRVs are useful for about 48 hours (that's how long they stick
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* around on the consensus). Let's also add 12 hours of drift for clock skewed
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* services that might be using an old consensus and we arrive to 60
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* hours. The max value should be beyond that.
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*/
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#define OPE_INPUT_MAX (1<<18)
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#define CRYPTO_OPE_ERROR UINT64_MAX
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typedef struct crypto_ope_t crypto_ope_t;
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crypto_ope_t *crypto_ope_new(const uint8_t *key);
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void crypto_ope_free_(crypto_ope_t *ope);
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#define crypto_ope_free(ope) \
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FREE_AND_NULL(crypto_ope_t, crypto_ope_free_, (ope))
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uint64_t crypto_ope_encrypt(const crypto_ope_t *ope, int plaintext);
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#ifdef CRYPTO_OPE_PRIVATE
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struct aes_cnt_cipher;
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STATIC struct aes_cnt_cipher *ope_get_cipher(const crypto_ope_t *ope,
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uint32_t initial_idx);
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STATIC uint64_t sum_values_from_cipher(struct aes_cnt_cipher *c, size_t n);
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#endif
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#endif
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