New macro to get the bit size of an elliptic curve
diff --git a/include/psa/crypto_sizes.h b/include/psa/crypto_sizes.h
index 34664fc..3cb0c73 100644
--- a/include/psa/crypto_sizes.h
+++ b/include/psa/crypto_sizes.h
@@ -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