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New macro to get the bit size of an elliptic curve

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This commit is contained in:
Gilles Peskine 2019-05-13 12:51:03 +02:00
parent ca5bed742f
commit 536e20571a
2 changed files with 42 additions and 3 deletions
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41
include/psa/crypto_sizes.h
View File

@ -187,6 +187,47 @@
#define PSA_VENDOR_ECC_MAX_CURVE_BITS 0
#endif
/** Bit size associated with an elliptic curve.
*
* \param curve An elliptic curve (value of type #psa_ecc_curve_t).
*
* \return The size associated with \p curve, in bits.
* This may be 0 if the implementation does not support
* the specified curve.
*/
#define PSA_ECC_CURVE_BITS(curve) \
((curve) == PSA_ECC_CURVE_SECT163K1 ? 163 : \
(curve) == PSA_ECC_CURVE_SECT163R1 ? 163 : \
(curve) == PSA_ECC_CURVE_SECT163R2 ? 163 : \
(curve) == PSA_ECC_CURVE_SECT193R1 ? 193 : \
(curve) == PSA_ECC_CURVE_SECT193R2 ? 193 : \
(curve) == PSA_ECC_CURVE_SECT233K1 ? 233 : \
(curve) == PSA_ECC_CURVE_SECT233R1 ? 233 : \
(curve) == PSA_ECC_CURVE_SECT239K1 ? 239 : \
(curve) == PSA_ECC_CURVE_SECT283K1 ? 283 : \
(curve) == PSA_ECC_CURVE_SECT283R1 ? 283 : \
(curve) == PSA_ECC_CURVE_SECT409K1 ? 409 : \
(curve) == PSA_ECC_CURVE_SECT409R1 ? 409 : \
(curve) == PSA_ECC_CURVE_SECT571K1 ? 571 : \
(curve) == PSA_ECC_CURVE_SECT571R1 ? 571 : \
(curve) == PSA_ECC_CURVE_SECP160K1 ? 160 : \
(curve) == PSA_ECC_CURVE_SECP160R1 ? 160 : \
(curve) == PSA_ECC_CURVE_SECP160R2 ? 160 : \
(curve) == PSA_ECC_CURVE_SECP192K1 ? 192 : \
(curve) == PSA_ECC_CURVE_SECP192R1 ? 192 : \
(curve) == PSA_ECC_CURVE_SECP224K1 ? 224 : \
(curve) == PSA_ECC_CURVE_SECP224R1 ? 224 : \
(curve) == PSA_ECC_CURVE_SECP256K1 ? 256 : \
(curve) == PSA_ECC_CURVE_SECP256R1 ? 256 : \
(curve) == PSA_ECC_CURVE_SECP384R1 ? 384 : \
(curve) == PSA_ECC_CURVE_SECP521R1 ? 521 : \
(curve) == PSA_ECC_CURVE_BRAINPOOL_P256R1 ? 256 : \
(curve) == PSA_ECC_CURVE_BRAINPOOL_P384R1 ? 384 : \
(curve) == PSA_ECC_CURVE_BRAINPOOL_P512R1 ? 512 : \
(curve) == PSA_ECC_CURVE_CURVE25519 ? 255 : \
(curve) == PSA_ECC_CURVE_CURVE448 ? 448 : \
0)
/** \def PSA_ALG_TLS12_PSK_TO_MS_MAX_PSK_LEN
*
* This macro returns the maximum length of the PSK supported

4
tests/suites/test_suite_psa_crypto_metadata.function
View File

@ -477,9 +477,7 @@ void ecc_key_types( int curve_arg, int curve_bits_arg )
TEST_EQUAL( PSA_KEY_TYPE_GET_CURVE( public_type ), curve );
TEST_EQUAL( PSA_KEY_TYPE_GET_CURVE( pair_type ), curve );
/* Validate that the bit size is less than the maximum ECC bit size
* in this implementation. There's no parameter that should be equal
* to curve_bits and can be validated without creating a key. */
TEST_EQUAL( curve_bits, PSA_ECC_CURVE_BITS( curve ) );
TEST_ASSERT( curve_bits <= PSA_VENDOR_ECC_MAX_CURVE_BITS );
}
/* END_CASE */