[PATCH] Add mkimage secp521r1 ECDSA curve support

[Joakim Tjernlund]

Signed-off-by: Joakim Tjernlund <joakim.tjernlund at infinera.com>
---
 include/u-boot/ecdsa.h      | 1 +
 lib/ecdsa/ecdsa-libcrypto.c | 2 +-
 tools/image-sig-host.c      | 7 +++++++
 3 files changed, 9 insertions(+), 1 deletion(-)

diff --git a/include/u-boot/ecdsa.h b/include/u-boot/ecdsa.h
index 53490c6b287..8f9f5e7d6e7 100644
--- a/include/u-boot/ecdsa.h
+++ b/include/u-boot/ecdsa.h
@@ -65,5 +65,6 @@ int ecdsa_verify(struct image_sign_info *info,
 /** @} */
 
 #define ECDSA256_BYTES	(256 / 8)
+#define ECDSA521_BYTES	((521 + 7) / 8)
 
 #endif
diff --git a/lib/ecdsa/ecdsa-libcrypto.c b/lib/ecdsa/ecdsa-libcrypto.c
index 5fa9be10b4b..403dfe0b97c 100644
--- a/lib/ecdsa/ecdsa-libcrypto.c
+++ b/lib/ecdsa/ecdsa-libcrypto.c
@@ -108,7 +108,7 @@ static size_t ecdsa_key_size_bytes(const EC_KEY *key)
 	const EC_GROUP *group;
 
 	group = EC_KEY_get0_group(key);
-	return EC_GROUP_order_bits(group) / 8;
+	return (EC_GROUP_order_bits(group) + 7) / 8;
 }
 
 static int default_password(char *buf, int size, int rwflag, void *u)
diff --git a/tools/image-sig-host.c b/tools/image-sig-host.c
index d0133aec4c8..21b4fa5d39d 100644
--- a/tools/image-sig-host.c
+++ b/tools/image-sig-host.c
@@ -76,6 +76,13 @@ struct crypto_algo crypto_algos[] = {
 		.add_verify_data = ecdsa_add_verify_data,
 		.verify = ecdsa_verify,
 	},
+	{
+		.name = "secp521r1",
+		.key_len = ECDSA521_BYTES,
+		.sign = ecdsa_sign,
+		.add_verify_data = ecdsa_add_verify_data,
+		.verify = ecdsa_verify,
+	},
 };
 
 struct padding_algo padding_algos[] = {
-- 
2.44.2