linux-kernel - [PATCH v3 06/10] crypte: ecc - Implement ecc_curve_get

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Date: Fri, 23 Feb 2024 15:41:45 -0500
From: Stefan Berger <stefanb@...ux.ibm.com>
To: keyrings@...r.kernel.org, linux-crypto@...r.kernel.org,
        herbert@...dor.apana.org.au, davem@...emloft.net
Cc: linux-kernel@...r.kernel.org, saulo.alessandre@....jus.br,
        Stefan Berger <stefanb@...ux.ibm.com>
Subject: [PATCH v3 06/10] crypte: ecc - Implement ecc_curve_get_nbits to get number of bits

If curve->nbits is set then return this number, otherwise use
the curve->ndigits to calculate the number of bits.

Signed-off-by: Stefan Berger <stefanb@...ux.ibm.com>
---
 include/crypto/internal/ecc.h | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/include/crypto/internal/ecc.h b/include/crypto/internal/ecc.h
index b8ca5023b3b5..2d321b47d0f7 100644
--- a/include/crypto/internal/ecc.h
+++ b/include/crypto/internal/ecc.h
@@ -75,6 +75,17 @@ static inline void ecc_digits_from_bytes(const u8 *in, unsigned int nbytes,
 	ecc_swap_digits(tmp, out, ndigits);
 }
 
+/**
+ * ecc_curve_get_nbits() - Get the number of bits of the curve
+ * @curve:    The curve
+ */
+static inline unsigned int ecc_curve_get_nbits(const struct ecc_curve *curve)
+{
+	if (curve->nbits)
+		return curve->nbits;
+	return curve->g.ndigits << ECC_DIGITS_TO_BYTES_SHIFT * 8;
+}
+
 /**
  * ecc_is_key_valid() - Validate a given ECDH private key
  *
-- 
2.43.0