[PATCH v3 01/10] crypto: ecdsa - Convert byte arrays with key coordinates to digits

[Stefan Berger <stefanb@linux.ibm.com>]

For NIST P192/256/384 the public key's x and y parameters could be copied
directly from a given array since both parameters filled 'ndigits' of
digits (a 'digit' is a u64). For support of NIST P521 the key parameters
first have to be copied into a temporary byte array with leading zeros
and can then be copied into the final digit array using ecc_swap_digits.

Implement ecc_digits_from_bytes to convert a byte array into an array of
digits and use this function in ecdsa_set_pub_key where an input byte array
needs to be converted into digits.

Signed-off-by: Stefan Berger <stefanb@linux.ibm.com>
---
 crypto/ecdsa.c                | 14 +++++++++-----
 include/crypto/internal/ecc.h | 19 +++++++++++++++++++
 2 files changed, 28 insertions(+), 5 deletions(-)

diff --git a/crypto/ecdsa.c b/crypto/ecdsa.c
index fbd76498aba8..ba8fb76fd165 100644
--- a/crypto/ecdsa.c
+++ b/crypto/ecdsa.c
@@ -222,9 +222,8 @@ static int ecdsa_ecc_ctx_reset(struct ecc_ctx *ctx)
 static int ecdsa_set_pub_key(struct crypto_akcipher *tfm, const void *key, unsigned int keylen)
 {
 	struct ecc_ctx *ctx = akcipher_tfm_ctx(tfm);
+	unsigned int digitlen, ndigits;
 	const unsigned char *d = key;
-	const u64 *digits = (const u64 *)&d[1];
-	unsigned int ndigits;
 	int ret;
 
 	ret = ecdsa_ecc_ctx_reset(ctx);
@@ -238,12 +237,17 @@ static int ecdsa_set_pub_key(struct crypto_akcipher *tfm, const void *key, unsig
 		return -EINVAL;
 
 	keylen--;
-	ndigits = (keylen >> 1) / sizeof(u64);
+	digitlen = keylen >> 1;
+
+	ndigits = digitlen / sizeof(u64);
 	if (ndigits != ctx->curve->g.ndigits)
 		return -EINVAL;
 
-	ecc_swap_digits(digits, ctx->pub_key.x, ndigits);
-	ecc_swap_digits(&digits[ndigits], ctx->pub_key.y, ndigits);
+	d++;
+
+	ecc_digits_from_bytes(d, digitlen, ctx->pub_key.x, ndigits);
+	ecc_digits_from_bytes(&d[digitlen], digitlen, ctx->pub_key.y, ndigits);
+
 	ret = ecc_is_pubkey_valid_full(ctx->curve, &ctx->pub_key);
 
 	ctx->pub_key_set = ret == 0;
diff --git a/include/crypto/internal/ecc.h b/include/crypto/internal/ecc.h
index 4f6c1a68882f..bee3329af7de 100644
--- a/include/crypto/internal/ecc.h
+++ b/include/crypto/internal/ecc.h
@@ -56,6 +56,25 @@ static inline void ecc_swap_digits(const void *in, u64 *out, unsigned int ndigit
 		out[i] = get_unaligned_be64(&src[ndigits - 1 - i]);
 }
 
+/**
+ * ecc_digits_from_bytes() - Create ndigits-sized digits array from byte array
+ * @in:       Input byte array
+ * @nbytes    Size of input byte array
+ * @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 sz = ndigits << ECC_DIGITS_TO_BYTES_SHIFT;
+	u8 tmp[ECC_MAX_DIGITS << ECC_DIGITS_TO_BYTES_SHIFT];
+	unsigned int o = sz - nbytes;
+
+	memset(tmp, 0, o);
+	memcpy(&tmp[o], in, nbytes);
+	ecc_swap_digits(tmp, out, ndigits);
+}
+
 /**
  * ecc_is_key_valid() - Validate a given ECDH private key
  *
-- 
2.43.0