1 files changed, 239 insertions, 0 deletions

diff --git a/crypto/shash.c b/crypto/shash.c
new file mode 100644
index 000000000000..82ec4bd8d2f5
--- /dev/null
+++ b/crypto/shash.c
@@ -0,0 +1,239 @@
+/*
+ * 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/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 inline struct crypto_shash *__crypto_shash_cast(struct crypto_tfm *tfm)
+{
+        return container_of(tfm, struct crypto_shash, base);
+}
+
+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 ((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);
+
+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 = {
+        .extsize = crypto_shash_extsize,
+        .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");