3 files changed, 103 insertions, 0 deletions

diff --git a/crypto/Kconfig b/crypto/Kconfig
index 4a3e6b225189..1676f171c54b 100644
--- a/crypto/Kconfig
+++ b/crypto/Kconfig
@@ -76,6 +76,10 @@ config CRYPTO_RNG2
         tristate
         select CRYPTO_ALGAPI2
 
+config CRYPTO_PCOMP
+        tristate
+        select CRYPTO_ALGAPI2
+
 config CRYPTO_MANAGER
         tristate "Cryptographic algorithm manager"
         select CRYPTO_MANAGER2
diff --git a/crypto/Makefile b/crypto/Makefile
index e05a844e08d5..1132a678b253 100644
--- a/crypto/Makefile
+++ b/crypto/Makefile
@@ -27,6 +27,8 @@ crypto_hash-objs += ahash.o
 crypto_hash-objs += shash.o
 obj-$(CONFIG_CRYPTO_HASH2) += crypto_hash.o
 
+obj-$(CONFIG_CRYPTO_PCOMP) += pcompress.o
+
 cryptomgr-objs := algboss.o testmgr.o
 
 obj-$(CONFIG_CRYPTO_MANAGER2) += cryptomgr.o
diff --git a/crypto/pcompress.c b/crypto/pcompress.c
new file mode 100644
index 000000000000..ca9a4af91efe
--- /dev/null
+++ b/crypto/pcompress.c
@@ -0,0 +1,97 @@
+/*
+ * Cryptographic API.
+ *
+ * Partial (de)compression operations.
+ *
+ * Copyright 2008 Sony Corporation
+ *
+ * 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; version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.
+ * If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <linux/crypto.h>
+#include <linux/errno.h>
+#include <linux/module.h>
+#include <linux/seq_file.h>
+#include <linux/string.h>
+
+#include <crypto/compress.h>
+
+#include "internal.h"
+
+
+static int crypto_pcomp_init(struct crypto_tfm *tfm, u32 type, u32 mask)
+{
+        return 0;
+}
+
+static unsigned int crypto_pcomp_extsize(struct crypto_alg *alg,
+                                         const struct crypto_type *frontend)
+{
+        return alg->cra_ctxsize;
+}
+
+static int crypto_pcomp_init_tfm(struct crypto_tfm *tfm,
+                                 const struct crypto_type *frontend)
+{
+        return 0;
+}
+
+static void crypto_pcomp_show(struct seq_file *m, struct crypto_alg *alg)
+        __attribute__ ((unused));
+static void crypto_pcomp_show(struct seq_file *m, struct crypto_alg *alg)
+{
+        seq_printf(m, "type         : pcomp\n");
+}
+
+static const struct crypto_type crypto_pcomp_type = {
+        .extsize        = crypto_pcomp_extsize,
+        .init           = crypto_pcomp_init,
+        .init_tfm       = crypto_pcomp_init_tfm,
+#ifdef CONFIG_PROC_FS
+        .show           = crypto_pcomp_show,
+#endif
+        .maskclear      = ~CRYPTO_ALG_TYPE_MASK,
+        .maskset        = CRYPTO_ALG_TYPE_MASK,
+        .type           = CRYPTO_ALG_TYPE_PCOMPRESS,
+        .tfmsize        = offsetof(struct crypto_pcomp, base),
+};
+
+struct crypto_pcomp *crypto_alloc_pcomp(const char *alg_name, u32 type,
+                                        u32 mask)
+{
+        return crypto_alloc_tfm(alg_name, &crypto_pcomp_type, type, mask);
+}
+EXPORT_SYMBOL_GPL(crypto_alloc_pcomp);
+
+int crypto_register_pcomp(struct pcomp_alg *alg)
+{
+        struct crypto_alg *base = &alg->base;
+
+        base->cra_type = &crypto_pcomp_type;
+        base->cra_flags &= ~CRYPTO_ALG_TYPE_MASK;
+        base->cra_flags |= CRYPTO_ALG_TYPE_PCOMPRESS;
+
+        return crypto_register_alg(base);
+}
+EXPORT_SYMBOL_GPL(crypto_register_pcomp);
+
+int crypto_unregister_pcomp(struct pcomp_alg *alg)
+{
+        return crypto_unregister_alg(&alg->base);
+}
+EXPORT_SYMBOL_GPL(crypto_unregister_pcomp);
+
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("Partial (de)compression type");
+MODULE_AUTHOR("Sony Corporation");