diff options
| -rw-r--r-- | crypto/authenc.c | 49 | ||||
| -rw-r--r-- | include/crypto/authenc.h | 27 |
2 files changed, 56 insertions, 20 deletions
diff --git a/crypto/authenc.c b/crypto/authenc.c index 5df5fb1..a61dea1 100644 --- a/crypto/authenc.c +++ b/crypto/authenc.c @@ -11,10 +11,12 @@ */ #include <crypto/algapi.h> +#include <crypto/authenc.h> #include <linux/err.h> #include <linux/init.h> #include <linux/kernel.h> #include <linux/module.h> +#include <linux/rtnetlink.h> #include <linux/slab.h> #include <linux/spinlock.h> @@ -23,8 +25,6 @@ struct authenc_instance_ctx { struct crypto_spawn auth; struct crypto_spawn enc; - - unsigned int enckeylen; }; struct crypto_authenc_ctx { @@ -36,19 +36,31 @@ struct crypto_authenc_ctx { static int crypto_authenc_setkey(struct crypto_aead *authenc, const u8 *key, unsigned int keylen) { - struct authenc_instance_ctx *ictx = - crypto_instance_ctx(crypto_aead_alg_instance(authenc)); - unsigned int enckeylen = ictx->enckeylen; unsigned int authkeylen; + unsigned int enckeylen; struct crypto_authenc_ctx *ctx = crypto_aead_ctx(authenc); struct crypto_hash *auth = ctx->auth; struct crypto_ablkcipher *enc = ctx->enc; + struct rtattr *rta = (void *)key; + struct crypto_authenc_key_param *param; int err = -EINVAL; - if (keylen < enckeylen) { - crypto_aead_set_flags(authenc, CRYPTO_TFM_RES_BAD_KEY_LEN); - goto out; - } + if (keylen < sizeof(*rta)) + 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_hash_clear_flags(auth, CRYPTO_TFM_REQ_MASK); @@ -70,6 +82,10 @@ static int crypto_authenc_setkey(struct crypto_aead *authenc, const u8 *key, out: return err; + +badkey: + crypto_aead_set_flags(authenc, CRYPTO_TFM_RES_BAD_KEY_LEN); + goto out; } static int crypto_authenc_hash(struct aead_request *req) @@ -263,7 +279,6 @@ static struct crypto_instance *crypto_authenc_alloc(struct rtattr **tb) struct crypto_alg *auth; struct crypto_alg *enc; struct authenc_instance_ctx *ctx; - unsigned int enckeylen; int err; err = crypto_check_attr_type(tb, CRYPTO_ALG_TYPE_AEAD); @@ -281,10 +296,6 @@ static struct crypto_instance *crypto_authenc_alloc(struct rtattr **tb) if (IS_ERR(enc)) goto out_put_auth; - err = crypto_attr_u32(tb[3], &enckeylen); - if (err) - goto out_put_enc; - inst = kzalloc(sizeof(*inst) + sizeof(*ctx), GFP_KERNEL); err = -ENOMEM; if (!inst) @@ -292,18 +303,16 @@ static struct crypto_instance *crypto_authenc_alloc(struct rtattr **tb) err = -ENAMETOOLONG; if (snprintf(inst->alg.cra_name, CRYPTO_MAX_ALG_NAME, - "authenc(%s,%s,%u)", auth->cra_name, - enc->cra_name, enckeylen) >= CRYPTO_MAX_ALG_NAME) + "authenc(%s,%s)", auth->cra_name, enc->cra_name) >= + CRYPTO_MAX_ALG_NAME) goto err_free_inst; if (snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME, - "authenc(%s,%s,%u)", auth->cra_driver_name, - enc->cra_driver_name, enckeylen) >= - CRYPTO_MAX_ALG_NAME) + "authenc(%s,%s)", auth->cra_driver_name, + enc->cra_driver_name) >= CRYPTO_MAX_ALG_NAME) goto err_free_inst; ctx = crypto_instance_ctx(inst); - ctx->enckeylen = enckeylen; err = crypto_init_spawn(&ctx->auth, auth, inst, CRYPTO_ALG_TYPE_MASK); if (err) diff --git a/include/crypto/authenc.h b/include/crypto/authenc.h new file mode 100644 index 0000000..e47b044 --- /dev/null +++ b/include/crypto/authenc.h @@ -0,0 +1,27 @@ +/* + * Authenc: Simple AEAD wrapper for IPsec + * + * Copyright (c) 2007 Herbert Xu <herbert@gondor.apana.org.au> + * + * This program is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License as published by the Free + * Software Foundation; either version 2 of the License, or (at your option) + * any later version. + * + */ +#ifndef _CRYPTO_AUTHENC_H +#define _CRYPTO_AUTHENC_H + +#include <linux/types.h> + +enum { + CRYPTO_AUTHENC_KEYA_UNSPEC, + CRYPTO_AUTHENC_KEYA_PARAM, +}; + +struct crypto_authenc_key_param { + __be32 enckeylen; +}; + +#endif /* _CRYPTO_AUTHENC_H */ + |