diff --git a/crypto/ecc.c b/crypto/ecc.c
index c1d2e884be1e..fe761256e335 100644
--- a/crypto/ecc.c
+++ b/crypto/ecc.c
@@ -68,6 +68,28 @@ const struct ecc_curve *ecc_get_curve(unsigned int curve_id)
 }
 EXPORT_SYMBOL(ecc_get_curve);
 
+void ecc_digits_from_bytes(const u8 *in, unsigned int nbytes,
+			   u64 *out, unsigned int ndigits)
+{
+	int diff = ndigits - DIV_ROUND_UP(nbytes, sizeof(u64));
+	unsigned int o = nbytes & 7;
+	__be64 msd = 0;
+
+	/* diff > 0: not enough input bytes: set most significant digits to 0 */
+	if (diff > 0) {
+		ndigits -= diff;
+		memset(&out[ndigits - 1], 0, diff * sizeof(u64));
+	}
+
+	if (o) {
+		memcpy((u8 *)&msd + sizeof(msd) - o, in, o);
+		out[--ndigits] = be64_to_cpu(msd);
+		in += o;
+	}
+	ecc_swap_digits(in, out, ndigits);
+}
+EXPORT_SYMBOL(ecc_digits_from_bytes);
+
 static u64 *ecc_alloc_digits_space(unsigned int ndigits)
 {
 	size_t len = ndigits * sizeof(u64);
diff --git a/include/crypto/internal/ecc.h b/include/crypto/internal/ecc.h
index 7ca1f463d1ec..f7e75e1e71f3 100644
--- a/include/crypto/internal/ecc.h
+++ b/include/crypto/internal/ecc.h
@@ -64,19 +64,8 @@ static inline void ecc_swap_digits(const void *in, u64 *out, unsigned int ndigit
  * @out       Output digits array
  * @ndigits:  Number of digits to create from byte array
  */
-static inline void ecc_digits_from_bytes(const u8 *in, unsigned int nbytes,
-					 u64 *out, unsigned int ndigits)
-{
-	unsigned int o = nbytes & 7;
-	__be64 msd = 0;
-
-	if (o) {
-		memcpy((u8 *)&msd + sizeof(msd) - o, in, o);
-		out[--ndigits] = be64_to_cpu(msd);
-		in += o;
-	}
-	ecc_swap_digits(in, out, ndigits);
-}
+void ecc_digits_from_bytes(const u8 *in, unsigned int nbytes,
+			   u64 *out, unsigned int ndigits);
 
 /**
  * ecc_is_key_valid() - Validate a given ECDH private key