crypto: authencesn - Simplify key parsing

Use the common helper function crypto_authenc_extractkeys() for key
parsing.

Cc: Herbert Xu <herbert@gondor.apana.org.au>
Cc: "David S. Miller" <davem@davemloft.net>
Signed-off-by: Mathias Krause <mathias.krause@secunet.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

diff --git a/crypto/authencesn.c b/crypto/authencesn.c
index c569d58..4be0dd4 100644 (file)
--- a/crypto/authencesn.c
+++ b/crypto/authencesn.c
@@ -59,37 +59,19 @@ static void authenc_esn_request_complete(struct aead_request *req, int err)
 static int crypto_authenc_esn_setkey(struct crypto_aead *authenc_esn, const u8 *key,
                                     unsigned int keylen)
 {
-       unsigned int authkeylen;
-       unsigned int enckeylen;
        struct crypto_authenc_esn_ctx *ctx = crypto_aead_ctx(authenc_esn);
        struct crypto_ahash *auth = ctx->auth;
        struct crypto_ablkcipher *enc = ctx->enc;
-       struct rtattr *rta = (void *)key;
-       struct crypto_authenc_key_param *param;
+       struct crypto_authenc_keys keys;
        int err = -EINVAL;
 
-       if (!RTA_OK(rta, keylen))
+       if (crypto_authenc_extractkeys(&keys, key, keylen) != 0)
                goto badkey;
-       if (rta->rta_type != CRYPTO_AUTHENC_KEYA_PARAM)
-               goto badkey;
-       if (RTA_PAYLOAD(rta) < sizeof(*param))
-               goto badkey;
-
-       param = RTA_DATA(rta);
-       enckeylen = be32_to_cpu(param->enckeylen);
-
-       key += RTA_ALIGN(rta->rta_len);
-       keylen -= RTA_ALIGN(rta->rta_len);
-
-       if (keylen < enckeylen)
-               goto badkey;
-
-       authkeylen = keylen - enckeylen;
 
        crypto_ahash_clear_flags(auth, CRYPTO_TFM_REQ_MASK);
        crypto_ahash_set_flags(auth, crypto_aead_get_flags(authenc_esn) &
                                     CRYPTO_TFM_REQ_MASK);
-       err = crypto_ahash_setkey(auth, key, authkeylen);
+       err = crypto_ahash_setkey(auth, keys.authkey, keys.authkeylen);
        crypto_aead_set_flags(authenc_esn, crypto_ahash_get_flags(auth) &
                                           CRYPTO_TFM_RES_MASK);
 
@@ -99,7 +81,7 @@ static int crypto_authenc_esn_setkey(struct crypto_aead *authenc_esn, const u8 *
        crypto_ablkcipher_clear_flags(enc, CRYPTO_TFM_REQ_MASK);
        crypto_ablkcipher_set_flags(enc, crypto_aead_get_flags(authenc_esn) &
                                         CRYPTO_TFM_REQ_MASK);
-       err = crypto_ablkcipher_setkey(enc, key + authkeylen, enckeylen);
+       err = crypto_ablkcipher_setkey(enc, keys.enckey, keys.enckeylen);
        crypto_aead_set_flags(authenc_esn, crypto_ablkcipher_get_flags(enc) &
                                           CRYPTO_TFM_RES_MASK);