This patch adds some common IV generation code currently duplicated
by seqiv and echainiv. For example, the setkey and setauthsize
functions are completely identical.
Signed-off-by: Herbert Xu <herbert@xxxxxxxxxxxxxxxxxxx>
---
crypto/aead.c | 205 +++++++++++++++++++++++++++++++++++++++-
include/crypto/internal/geniv.h | 24 ++++
2 files changed, 226 insertions(+), 3 deletions(-)
diff --git a/crypto/aead.c b/crypto/aead.c
index 35c55e0..8cdea89 100644
--- a/crypto/aead.c
+++ b/crypto/aead.c
@@ -12,7 +12,7 @@
*
*/
-#include <crypto/internal/aead.h>
+#include <crypto/internal/geniv.h>
#include <crypto/scatterwalk.h>
#include <linux/err.h>
#include <linux/init.h>
@@ -27,6 +27,14 @@
#include "internal.h"
+struct compat_request_ctx {
+ struct scatterlist src[2];
+ struct scatterlist dst[2];
+ struct scatterlist ivbuf[2];
+ struct scatterlist *ivsg;
+ struct aead_givcrypt_request subreq;
+};
+
static int aead_null_givencrypt(struct aead_givcrypt_request *req);
static int aead_null_givdecrypt(struct aead_givcrypt_request *req);
@@ -373,6 +381,185 @@ static int crypto_grab_nivaead(struct crypto_aead_spawn *spawn,
return crypto_grab_spawn(&spawn->base, name, type, mask);
}
+static int aead_geniv_setkey(struct crypto_aead *tfm,
+ const u8 *key, unsigned int keylen)
+{
+ struct aead_geniv_ctx *ctx = crypto_aead_ctx(tfm);
+
+ return crypto_aead_setkey(ctx->child, key, keylen);
+}
+
+static int aead_geniv_setauthsize(struct crypto_aead *tfm,
+ unsigned int authsize)
+{
+ struct aead_geniv_ctx *ctx = crypto_aead_ctx(tfm);
+
+ return crypto_aead_setauthsize(ctx->child, authsize);
+}
+
+static void compat_encrypt_complete2(struct aead_request *req, int err)
+{
+ struct compat_request_ctx *rctx = aead_request_ctx(req);
+ struct aead_givcrypt_request *subreq = &rctx->subreq;
+ struct crypto_aead *geniv;
+
+ if (err == -EINPROGRESS)
+ return;
+
+ if (err)
+ goto out;
+
+ geniv = crypto_aead_reqtfm(req);
+ scatterwalk_map_and_copy(subreq->giv, rctx->ivsg, 0,
+ crypto_aead_ivsize(geniv), 1);
+
+out:
+ kzfree(subreq->giv);
+}
+
+static void compat_encrypt_complete(struct crypto_async_request *base, int err)
+{
+ struct aead_request *req = base->data;
+
+ compat_encrypt_complete2(req, err);
+ aead_request_complete(req, err);
+}
+
+static int compat_encrypt(struct aead_request *req)
+{
+ struct crypto_aead *geniv = crypto_aead_reqtfm(req);
+ struct aead_geniv_ctx *ctx = crypto_aead_ctx(geniv);
+ struct compat_request_ctx *rctx = aead_request_ctx(req);
+ struct aead_givcrypt_request *subreq = &rctx->subreq;
+ unsigned int ivsize = crypto_aead_ivsize(geniv);
+ struct scatterlist *src, *dst;
+ crypto_completion_t compl;
+ void *data;
+ u8 *info;
+ __be64 seq;
+ int err;
+
+ if (req->cryptlen < ivsize)
+ return -EINVAL;
+
+ compl = req->base.complete;
+ data = req->base.data;
+
+ rctx->ivsg = scatterwalk_ffwd(rctx->ivbuf, req->dst, req->assoclen);
+ info = PageHighMem(sg_page(rctx->ivsg)) ? NULL : sg_virt(rctx->ivsg);
+
+ if (!info) {
+ info = kmalloc(ivsize, req->base.flags &
+ CRYPTO_TFM_REQ_MAY_SLEEP ? GFP_KERNEL:
+ GFP_ATOMIC);
+ if (!info)
+ return -ENOMEM;
+
+ compl = compat_encrypt_complete;
+ data = req;
+ }
+
+ memcpy(&seq, req->iv + ivsize - sizeof(seq), sizeof(seq));
+
+ src = scatterwalk_ffwd(rctx->src, req->src, req->assoclen + ivsize);
+ dst = req->src == req->dst ?
+ src : scatterwalk_ffwd(rctx->dst, rctx->ivsg, ivsize);
+
+ aead_givcrypt_set_tfm(subreq, ctx->child);
+ aead_givcrypt_set_callback(subreq, req->base.flags,
+ req->base.complete, req->base.data);
+ aead_givcrypt_set_crypt(subreq, src, dst,
+ req->cryptlen - ivsize, req->iv);
+ aead_givcrypt_set_assoc(subreq, req->src, req->assoclen);
+ aead_givcrypt_set_giv(subreq, info, be64_to_cpu(seq));
+
+ err = crypto_aead_givencrypt(subreq);
+ if (unlikely(PageHighMem(sg_page(rctx->ivsg))))
+ compat_encrypt_complete2(req, err);
+ return err;
+}
+
+static int compat_decrypt(struct aead_request *req)
+{
+ struct crypto_aead *geniv = crypto_aead_reqtfm(req);
+ struct aead_geniv_ctx *ctx = crypto_aead_ctx(geniv);
+ struct compat_request_ctx *rctx = aead_request_ctx(req);
+ struct aead_request *subreq = &rctx->subreq.areq;
+ unsigned int ivsize = crypto_aead_ivsize(geniv);
+ struct scatterlist *src, *dst;
+ crypto_completion_t compl;
+ void *data;
+
+ if (req->cryptlen < ivsize)
+ return -EINVAL;
+
+ aead_request_set_tfm(subreq, ctx->child);
+
+ compl = req->base.complete;
+ data = req->base.data;
+
+ src = scatterwalk_ffwd(rctx->src, req->src, req->assoclen + ivsize);
+ dst = req->src == req->dst ?
+ src : scatterwalk_ffwd(rctx->dst, req->dst,
+ req->assoclen + ivsize);
+
+ aead_request_set_callback(subreq, req->base.flags, compl, data);
+ aead_request_set_crypt(subreq, src, dst,
+ req->cryptlen - ivsize, req->iv);
+ aead_request_set_assoc(subreq, req->src, req->assoclen);
+
+ scatterwalk_map_and_copy(req->iv, req->src, req->assoclen, ivsize, 0);
+
+ return crypto_aead_decrypt(subreq);
+}
+
+static int compat_encrypt_first(struct aead_request *req)
+{
+ struct crypto_aead *geniv = crypto_aead_reqtfm(req);
+ struct aead_geniv_ctx *ctx = crypto_aead_ctx(geniv);
+ int err = 0;
+
+ spin_lock_bh(&ctx->lock);
+ if (geniv->encrypt != compat_encrypt_first)
+ goto unlock;
+
+ geniv->encrypt = compat_encrypt;
+
+unlock:
+ spin_unlock_bh(&ctx->lock);
+
+ if (err)
+ return err;
+
+ return compat_encrypt(req);
+}
+
+static int aead_geniv_init_compat(struct crypto_tfm *tfm)
+{
+ struct crypto_aead *geniv = __crypto_aead_cast(tfm);
+ struct aead_geniv_ctx *ctx = crypto_aead_ctx(geniv);
+ int err;
+
+ spin_lock_init(&ctx->lock);
+
+ crypto_aead_set_reqsize(geniv, sizeof(struct compat_request_ctx));
+
+ err = aead_geniv_init(tfm);
+
+ ctx->child = geniv->child;
+ geniv->child = geniv;
+
+ return err;
+}
+
+static void aead_geniv_exit_compat(struct crypto_tfm *tfm)
+{
+ struct crypto_aead *geniv = __crypto_aead_cast(tfm);
+ struct aead_geniv_ctx *ctx = crypto_aead_ctx(geniv);
+
+ crypto_free_aead(ctx->child);
+}
+
struct aead_instance *aead_geniv_alloc(struct crypto_template *tmpl,
struct rtattr **tb, u32 type, u32 mask)
{
@@ -407,7 +594,9 @@ struct aead_instance *aead_geniv_alloc(struct crypto_template *tmpl,
mask |= crypto_requires_sync(algt->type, algt->mask);
crypto_set_aead_spawn(spawn, aead_crypto_instance(inst));
- err = crypto_grab_nivaead(spawn, name, type, mask);
+ err = (algt->mask & CRYPTO_ALG_GENIV) ?
+ crypto_grab_nivaead(spawn, name, type, mask) :
+ crypto_grab_aead(spawn, name, type, mask);
if (err)
goto err_free_inst;
@@ -417,7 +606,7 @@ struct aead_instance *aead_geniv_alloc(struct crypto_template *tmpl,
maxauthsize = crypto_aead_alg_maxauthsize(alg);
err = -EINVAL;
- if (!ivsize)
+ if (ivsize < sizeof(u64))
goto err_drop_alg;
/*
@@ -471,10 +660,20 @@ struct aead_instance *aead_geniv_alloc(struct crypto_template *tmpl,
inst->alg.base.cra_priority = alg->base.cra_priority;
inst->alg.base.cra_blocksize = alg->base.cra_blocksize;
inst->alg.base.cra_alignmask = alg->base.cra_alignmask;
+ inst->alg.base.cra_ctxsize = sizeof(struct aead_geniv_ctx);
+
+ inst->alg.setkey = aead_geniv_setkey;
+ inst->alg.setauthsize = aead_geniv_setauthsize;
inst->alg.ivsize = ivsize;
inst->alg.maxauthsize = maxauthsize;
+ inst->alg.encrypt = compat_encrypt_first;
+ inst->alg.decrypt = compat_decrypt;
+
+ inst->alg.base.cra_init = aead_geniv_init_compat;
+ inst->alg.base.cra_exit = aead_geniv_exit_compat;
+
out:
return inst;
diff --git a/include/crypto/internal/geniv.h b/include/crypto/internal/geniv.h
new file mode 100644
index 0000000..9ca9b87
--- /dev/null
+++ b/include/crypto/internal/geniv.h
@@ -0,0 +1,24 @@
+/*
+ * geniv: IV generation
+ *
+ * Copyright (c) 2015 Herbert Xu <herbert@xxxxxxxxxxxxxxxxxxx>
+ *
+ * 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_INTERNAL_GENIV_H
+#define _CRYPTO_INTERNAL_GENIV_H
+
+#include <crypto/internal/aead.h>
+#include <linux/spinlock.h>
+
+struct aead_geniv_ctx {
+ spinlock_t lock;
+ struct crypto_aead *child;
+};
+
+#endif /* _CRYPTO_INTERNAL_GENIV_H */
--
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