1 files changed, 4 insertions, 34 deletions

diff --git a/crypto/asymmetric_keys/public_key.c b/crypto/asymmetric_keys/public_key.c
index 8bf5aa329c26..ec2c0e009b49 100644
--- a/crypto/asymmetric_keys/public_key.c
+++ b/crypto/asymmetric_keys/public_key.c
@@ -202,6 +202,8 @@ static int software_key_query(const struct kernel_pkey_params *params,
 			goto error_free_tfm;
 
 		len = crypto_sig_keysize(sig);
+		info->max_sig_size = crypto_sig_maxsize(sig);
+		info->max_data_size = crypto_sig_digestsize(sig);
 
 		info->supported_ops = KEYCTL_SUPPORTS_VERIFY;
 		if (pkey->key_is_private)
@@ -227,6 +229,8 @@ static int software_key_query(const struct kernel_pkey_params *params,
 			goto error_free_tfm;
 
 		len = crypto_akcipher_maxsize(tfm);
+		info->max_sig_size = len;
+		info->max_data_size = len;
 
 		info->supported_ops = KEYCTL_SUPPORTS_ENCRYPT;
 		if (pkey->key_is_private)
@@ -234,40 +238,6 @@ static int software_key_query(const struct kernel_pkey_params *params,
 	}
 
 	info->key_size = len * 8;
-
-	if (strncmp(pkey->pkey_algo, "ecdsa", 5) == 0) {
-		int slen = len;
-		/*
-		 * ECDSA key sizes are much smaller than RSA, and thus could
-		 * operate on (hashed) inputs that are larger than key size.
-		 * For example SHA384-hashed input used with secp256r1
-		 * based keys.  Set max_data_size to be at least as large as
-		 * the largest supported hash size (SHA512)
-		 */
-		info->max_data_size = 64;
-
-		/*
-		 * Verify takes ECDSA-Sig (described in RFC 5480) as input,
-		 * which is actually 2 'key_size'-bit integers encoded in
-		 * ASN.1.  Account for the ASN.1 encoding overhead here.
-		 *
-		 * NIST P192/256/384 may prepend a '0' to a coordinate to
-		 * indicate a positive integer. NIST P521 never needs it.
-		 */
-		if (strcmp(pkey->pkey_algo, "ecdsa-nist-p521") != 0)
-			slen += 1;
-		/* Length of encoding the x & y coordinates */
-		slen = 2 * (slen + 2);
-		/*
-		 * If coordinate encoding takes at least 128 bytes then an
-		 * additional byte for length encoding is needed.
-		 */
-		info->max_sig_size = 1 + (slen >= 128) + 1 + slen;
-	} else {
-		info->max_data_size = len;
-		info->max_sig_size = len;
-	}
-
 	info->max_enc_size = len;
 	info->max_dec_size = len;