1 files changed, 508 insertions, 0 deletions
diff --git a/crypto/shash.c b/crypto/shash.c
new file mode 100644
index 00000000000..c9df367332f
--- /dev/null
+++ b/crypto/shash.c
@@ -0,0 +1,508 @@
+/*
+ * Synchronous Cryptographic Hash operations.
+ *
+ * Copyright (c) 2008 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.
+ *
+ */
+
+#include <crypto/scatterwalk.h>
+#include <crypto/internal/hash.h>
+#include <linux/err.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/seq_file.h>
+
+static const struct crypto_type crypto_shash_type;
+
+static inline struct crypto_shash *__crypto_shash_cast(struct crypto_tfm *tfm)
+{
+	return container_of(tfm, struct crypto_shash, base);
+}
+
+#include "internal.h"
+
+static int shash_setkey_unaligned(struct crypto_shash *tfm, const u8 *key,
+				  unsigned int keylen)
+{
+	struct shash_alg *shash = crypto_shash_alg(tfm);
+	unsigned long alignmask = crypto_shash_alignmask(tfm);
+	unsigned long absize;
+	u8 *buffer, *alignbuffer;
+	int err;
+
+	absize = keylen + (alignmask & ~(CRYPTO_MINALIGN - 1));
+	buffer = kmalloc(absize, GFP_KERNEL);
+	if (!buffer)
+		return -ENOMEM;
+
+	alignbuffer = (u8 *)ALIGN((unsigned long)buffer, alignmask + 1);
+	memcpy(alignbuffer, key, keylen);
+	err = shash->setkey(tfm, alignbuffer, keylen);
+	memset(alignbuffer, 0, keylen);
+	kfree(buffer);
+	return err;
+}
+
+int crypto_shash_setkey(struct crypto_shash *tfm, const u8 *key,
+			unsigned int keylen)
+{
+	struct shash_alg *shash = crypto_shash_alg(tfm);
+	unsigned long alignmask = crypto_shash_alignmask(tfm);
+
+	if (!shash->setkey)
+		return -ENOSYS;
+
+	if ((unsigned long)key & alignmask)
+		return shash_setkey_unaligned(tfm, key, keylen);
+
+	return shash->setkey(tfm, key, keylen);
+}
+EXPORT_SYMBOL_GPL(crypto_shash_setkey);
+
+static inline unsigned int shash_align_buffer_size(unsigned len,
+						   unsigned long mask)
+{
+	return len + (mask & ~(__alignof__(u8 __attribute__ ((aligned))) - 1));
+}
+
+static int shash_update_unaligned(struct shash_desc *desc, const u8 *data,
+				  unsigned int len)
+{
+	struct crypto_shash *tfm = desc->tfm;
+	struct shash_alg *shash = crypto_shash_alg(tfm);
+	unsigned long alignmask = crypto_shash_alignmask(tfm);
+	unsigned int unaligned_len = alignmask + 1 -
+				     ((unsigned long)data & alignmask);
+	u8 buf[shash_align_buffer_size(unaligned_len, alignmask)]
+		__attribute__ ((aligned));
+
+	memcpy(buf, data, unaligned_len);
+
+	return shash->update(desc, buf, unaligned_len) ?:
+	       shash->update(desc, data + unaligned_len, len - unaligned_len);
+}
+
+int crypto_shash_update(struct shash_desc *desc, const u8 *data,
+			unsigned int len)
+{
+	struct crypto_shash *tfm = desc->tfm;
+	struct shash_alg *shash = crypto_shash_alg(tfm);
+	unsigned long alignmask = crypto_shash_alignmask(tfm);
+
+	if ((unsigned long)data & alignmask)
+		return shash_update_unaligned(desc, data, len);
+
+	return shash->update(desc, data, len);
+}
+EXPORT_SYMBOL_GPL(crypto_shash_update);
+
+static int shash_final_unaligned(struct shash_desc *desc, u8 *out)
+{
+	struct crypto_shash *tfm = desc->tfm;
+	unsigned long alignmask = crypto_shash_alignmask(tfm);
+	struct shash_alg *shash = crypto_shash_alg(tfm);
+	unsigned int ds = crypto_shash_digestsize(tfm);
+	u8 buf[shash_align_buffer_size(ds, alignmask)]
+		__attribute__ ((aligned));
+	int err;
+
+	err = shash->final(desc, buf);
+	memcpy(out, buf, ds);
+	return err;
+}
+
+int crypto_shash_final(struct shash_desc *desc, u8 *out)
+{
+	struct crypto_shash *tfm = desc->tfm;
+	struct shash_alg *shash = crypto_shash_alg(tfm);
+	unsigned long alignmask = crypto_shash_alignmask(tfm);
+
+	if ((unsigned long)out & alignmask)
+		return shash_final_unaligned(desc, out);
+
+	return shash->final(desc, out);
+}
+EXPORT_SYMBOL_GPL(crypto_shash_final);
+
+static int shash_finup_unaligned(struct shash_desc *desc, const u8 *data,
+				 unsigned int len, u8 *out)
+{
+	return crypto_shash_update(desc, data, len) ?:
+	       crypto_shash_final(desc, out);
+}
+
+int crypto_shash_finup(struct shash_desc *desc, const u8 *data,
+		       unsigned int len, u8 *out)
+{
+	struct crypto_shash *tfm = desc->tfm;
+	struct shash_alg *shash = crypto_shash_alg(tfm);
+	unsigned long alignmask = crypto_shash_alignmask(tfm);
+
+	if (((unsigned long)data | (unsigned long)out) & alignmask ||
+	    !shash->finup)
+		return shash_finup_unaligned(desc, data, len, out);
+
+	return shash->finup(desc, data, len, out);
+}
+EXPORT_SYMBOL_GPL(crypto_shash_finup);
+
+static int shash_digest_unaligned(struct shash_desc *desc, const u8 *data,
+				  unsigned int len, u8 *out)
+{
+	return crypto_shash_init(desc) ?:
+	       crypto_shash_update(desc, data, len) ?:
+	       crypto_shash_final(desc, out);
+}
+
+int crypto_shash_digest(struct shash_desc *desc, const u8 *data,
+			unsigned int len, u8 *out)
+{
+	struct crypto_shash *tfm = desc->tfm;
+	struct shash_alg *shash = crypto_shash_alg(tfm);
+	unsigned long alignmask = crypto_shash_alignmask(tfm);
+
+	if (((unsigned long)data | (unsigned long)out) & alignmask ||
+	    !shash->digest)
+		return shash_digest_unaligned(desc, data, len, out);
+
+	return shash->digest(desc, data, len, out);
+}
+EXPORT_SYMBOL_GPL(crypto_shash_digest);
+
+int crypto_shash_import(struct shash_desc *desc, const u8 *in)
+{
+	struct crypto_shash *tfm = desc->tfm;
+	struct shash_alg *alg = crypto_shash_alg(tfm);
+
+	memcpy(shash_desc_ctx(desc), in, crypto_shash_descsize(tfm));
+
+	if (alg->reinit)
+		alg->reinit(desc);
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(crypto_shash_import);
+
+static int shash_async_setkey(struct crypto_ahash *tfm, const u8 *key,
+			      unsigned int keylen)
+{
+	struct crypto_shash **ctx = crypto_ahash_ctx(tfm);
+
+	return crypto_shash_setkey(*ctx, key, keylen);
+}
+
+static int shash_async_init(struct ahash_request *req)
+{
+	struct crypto_shash **ctx = crypto_ahash_ctx(crypto_ahash_reqtfm(req));
+	struct shash_desc *desc = ahash_request_ctx(req);
+
+	desc->tfm = *ctx;
+	desc->flags = req->base.flags;
+
+	return crypto_shash_init(desc);
+}
+
+static int shash_async_update(struct ahash_request *req)
+{
+	struct shash_desc *desc = ahash_request_ctx(req);
+	struct crypto_hash_walk walk;
+	int nbytes;
+
+	for (nbytes = crypto_hash_walk_first(req, &walk); nbytes > 0;
+	     nbytes = crypto_hash_walk_done(&walk, nbytes))
+		nbytes = crypto_shash_update(desc, walk.data, nbytes);
+
+	return nbytes;
+}
+
+static int shash_async_final(struct ahash_request *req)
+{
+	return crypto_shash_final(ahash_request_ctx(req), req->result);
+}
+
+static int shash_async_digest(struct ahash_request *req)
+{
+	struct scatterlist *sg = req->src;
+	unsigned int offset = sg->offset;
+	unsigned int nbytes = req->nbytes;
+	int err;
+
+	if (nbytes < min(sg->length, ((unsigned int)(PAGE_SIZE)) - offset)) {
+		struct crypto_shash **ctx =
+			crypto_ahash_ctx(crypto_ahash_reqtfm(req));
+		struct shash_desc *desc = ahash_request_ctx(req);
+		void *data;
+
+		desc->tfm = *ctx;
+		desc->flags = req->base.flags;
+
+		data = crypto_kmap(sg_page(sg), 0);
+		err = crypto_shash_digest(desc, data + offset, nbytes,
+					  req->result);
+		crypto_kunmap(data, 0);
+		crypto_yield(desc->flags);
+		goto out;
+	}
+
+	err = shash_async_init(req);
+	if (err)
+		goto out;
+
+	err = shash_async_update(req);
+	if (err)
+		goto out;
+
+	err = shash_async_final(req);
+
+out:
+	return err;
+}
+
+static void crypto_exit_shash_ops_async(struct crypto_tfm *tfm)
+{
+	struct crypto_shash **ctx = crypto_tfm_ctx(tfm);
+
+	crypto_free_shash(*ctx);
+}
+
+static int crypto_init_shash_ops_async(struct crypto_tfm *tfm)
+{
+	struct crypto_alg *calg = tfm->__crt_alg;
+	struct shash_alg *alg = __crypto_shash_alg(calg);
+	struct ahash_tfm *crt = &tfm->crt_ahash;
+	struct crypto_shash **ctx = crypto_tfm_ctx(tfm);
+	struct crypto_shash *shash;
+
+	if (!crypto_mod_get(calg))
+		return -EAGAIN;
+
+	shash = __crypto_shash_cast(crypto_create_tfm(
+		calg, &crypto_shash_type));
+	if (IS_ERR(shash)) {
+		crypto_mod_put(calg);
+		return PTR_ERR(shash);
+	}
+
+	*ctx = shash;
+	tfm->exit = crypto_exit_shash_ops_async;
+
+	crt->init = shash_async_init;
+	crt->update = shash_async_update;
+	crt->final  = shash_async_final;
+	crt->digest = shash_async_digest;
+	crt->setkey = shash_async_setkey;
+
+	crt->digestsize = alg->digestsize;
+	crt->reqsize = sizeof(struct shash_desc) + crypto_shash_descsize(shash);
+
+	return 0;
+}
+
+static int shash_compat_setkey(struct crypto_hash *tfm, const u8 *key,
+			       unsigned int keylen)
+{
+	struct shash_desc *desc = crypto_hash_ctx(tfm);
+
+	return crypto_shash_setkey(desc->tfm, key, keylen);
+}
+
+static int shash_compat_init(struct hash_desc *hdesc)
+{
+	struct shash_desc *desc = crypto_hash_ctx(hdesc->tfm);
+
+	desc->flags = hdesc->flags;
+
+	return crypto_shash_init(desc);
+}
+
+static int shash_compat_update(struct hash_desc *hdesc, struct scatterlist *sg,
+			       unsigned int len)
+{
+	struct shash_desc *desc = crypto_hash_ctx(hdesc->tfm);
+	struct crypto_hash_walk walk;
+	int nbytes;
+
+	for (nbytes = crypto_hash_walk_first_compat(hdesc, &walk, sg, len);
+	     nbytes > 0; nbytes = crypto_hash_walk_done(&walk, nbytes))
+		nbytes = crypto_shash_update(desc, walk.data, nbytes);
+
+	return nbytes;
+}
+
+static int shash_compat_final(struct hash_desc *hdesc, u8 *out)
+{
+	return crypto_shash_final(crypto_hash_ctx(hdesc->tfm), out);
+}
+
+static int shash_compat_digest(struct hash_desc *hdesc, struct scatterlist *sg,
+			       unsigned int nbytes, u8 *out)
+{
+	unsigned int offset = sg->offset;
+	int err;
+
+	if (nbytes < min(sg->length, ((unsigned int)(PAGE_SIZE)) - offset)) {
+		struct shash_desc *desc = crypto_hash_ctx(hdesc->tfm);
+		void *data;
+
+		desc->flags = hdesc->flags;
+
+		data = crypto_kmap(sg_page(sg), 0);
+		err = crypto_shash_digest(desc, data + offset, nbytes, out);
+		crypto_kunmap(data, 0);
+		crypto_yield(desc->flags);
+		goto out;
+	}
+
+	err = shash_compat_init(hdesc);
+	if (err)
+		goto out;
+
+	err = shash_compat_update(hdesc, sg, nbytes);
+	if (err)
+		goto out;
+
+	err = shash_compat_final(hdesc, out);
+
+out:
+	return err;
+}
+
+static void crypto_exit_shash_ops_compat(struct crypto_tfm *tfm)
+{
+	struct shash_desc *desc= crypto_tfm_ctx(tfm);
+
+	crypto_free_shash(desc->tfm);
+}
+
+static int crypto_init_shash_ops_compat(struct crypto_tfm *tfm)
+{
+	struct hash_tfm *crt = &tfm->crt_hash;
+	struct crypto_alg *calg = tfm->__crt_alg;
+	struct shash_alg *alg = __crypto_shash_alg(calg);
+	struct shash_desc *desc = crypto_tfm_ctx(tfm);
+	struct crypto_shash *shash;
+
+	shash = __crypto_shash_cast(crypto_create_tfm(
+		calg, &crypto_shash_type));
+	if (IS_ERR(shash))
+		return PTR_ERR(shash);
+
+	desc->tfm = shash;
+	tfm->exit = crypto_exit_shash_ops_compat;
+
+	crt->init = shash_compat_init;
+	crt->update = shash_compat_update;
+	crt->final  = shash_compat_final;
+	crt->digest = shash_compat_digest;
+	crt->setkey = shash_compat_setkey;
+
+	crt->digestsize = alg->digestsize;
+
+	return 0;
+}
+
+static int crypto_init_shash_ops(struct crypto_tfm *tfm, u32 type, u32 mask)
+{
+	switch (mask & CRYPTO_ALG_TYPE_MASK) {
+	case CRYPTO_ALG_TYPE_HASH_MASK:
+		return crypto_init_shash_ops_compat(tfm);
+	case CRYPTO_ALG_TYPE_AHASH_MASK:
+		return crypto_init_shash_ops_async(tfm);
+	}
+
+	return -EINVAL;
+}
+
+static unsigned int crypto_shash_ctxsize(struct crypto_alg *alg, u32 type,
+					 u32 mask)
+{
+	struct shash_alg *salg = __crypto_shash_alg(alg);
+
+	switch (mask & CRYPTO_ALG_TYPE_MASK) {
+	case CRYPTO_ALG_TYPE_HASH_MASK:
+		return sizeof(struct shash_desc) + salg->descsize;
+	case CRYPTO_ALG_TYPE_AHASH_MASK:
+		return sizeof(struct crypto_shash *);
+	}
+
+	return 0;
+}
+
+static int crypto_shash_init_tfm(struct crypto_tfm *tfm,
+				 const struct crypto_type *frontend)
+{
+	if (frontend->type != CRYPTO_ALG_TYPE_SHASH)
+		return -EINVAL;
+	return 0;
+}
+
+static unsigned int crypto_shash_extsize(struct crypto_alg *alg,
+					 const struct crypto_type *frontend)
+{
+	return alg->cra_ctxsize;
+}
+
+static void crypto_shash_show(struct seq_file *m, struct crypto_alg *alg)
+	__attribute__ ((unused));
+static void crypto_shash_show(struct seq_file *m, struct crypto_alg *alg)
+{
+	struct shash_alg *salg = __crypto_shash_alg(alg);
+
+	seq_printf(m, "type         : shash\n");
+	seq_printf(m, "blocksize    : %u\n", alg->cra_blocksize);
+	seq_printf(m, "digestsize   : %u\n", salg->digestsize);
+	seq_printf(m, "descsize     : %u\n", salg->descsize);
+}
+
+static const struct crypto_type crypto_shash_type = {
+	.ctxsize = crypto_shash_ctxsize,
+	.extsize = crypto_shash_extsize,
+	.init = crypto_init_shash_ops,
+	.init_tfm = crypto_shash_init_tfm,
+#ifdef CONFIG_PROC_FS
+	.show = crypto_shash_show,
+#endif
+	.maskclear = ~CRYPTO_ALG_TYPE_MASK,
+	.maskset = CRYPTO_ALG_TYPE_MASK,
+	.type = CRYPTO_ALG_TYPE_SHASH,
+	.tfmsize = offsetof(struct crypto_shash, base),
+};
+
+struct crypto_shash *crypto_alloc_shash(const char *alg_name, u32 type,
+					u32 mask)
+{
+	return __crypto_shash_cast(
+		crypto_alloc_tfm(alg_name, &crypto_shash_type, type, mask));
+}
+EXPORT_SYMBOL_GPL(crypto_alloc_shash);
+
+int crypto_register_shash(struct shash_alg *alg)
+{
+	struct crypto_alg *base = &alg->base;
+
+	if (alg->digestsize > PAGE_SIZE / 8 ||
+	    alg->descsize > PAGE_SIZE / 8)
+		return -EINVAL;
+
+	base->cra_type = &crypto_shash_type;
+	base->cra_flags &= ~CRYPTO_ALG_TYPE_MASK;
+	base->cra_flags |= CRYPTO_ALG_TYPE_SHASH;
+
+	return crypto_register_alg(base);
+}
+EXPORT_SYMBOL_GPL(crypto_register_shash);
+
+int crypto_unregister_shash(struct shash_alg *alg)
+{
+	return crypto_unregister_alg(&alg->base);
+}
+EXPORT_SYMBOL_GPL(crypto_unregister_shash);
+
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("Synchronous cryptographic hash type");