1 files changed, 107 insertions, 0 deletions

diff --git a/crypto/digest.c b/crypto/digest.c
new file mode 100644
index 000000000000..d9b6ac9dbf8d
--- /dev/null
+++ b/crypto/digest.c
@@ -0,0 +1,107 @@
+/*
+ * Cryptographic API.
+ *
+ * Digest operations.
+ *
+ * Copyright (c) 2002 James Morris <jmorris@intercode.com.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 <linux/crypto.h>
+#include <linux/mm.h>
+#include <linux/errno.h>
+#include <linux/highmem.h>
+#include <asm/scatterlist.h>
+#include "internal.h"
+
+static void init(struct crypto_tfm *tfm)
+{
+        tfm->__crt_alg->cra_digest.dia_init(crypto_tfm_ctx(tfm));
+}
+
+static void update(struct crypto_tfm *tfm,
+                   struct scatterlist *sg, unsigned int nsg)
+{
+        unsigned int i;
+
+        for (i = 0; i < nsg; i++) {
+
+                struct page *pg = sg[i].page;
+                unsigned int offset = sg[i].offset;
+                unsigned int l = sg[i].length;
+
+                do {
+                        unsigned int bytes_from_page = min(l, ((unsigned int)
+                                                           (PAGE_SIZE)) - 
+                                                           offset);
+                        char *p = crypto_kmap(pg, 0) + offset;
+
+                        tfm->__crt_alg->cra_digest.dia_update
+                                        (crypto_tfm_ctx(tfm), p,
+                                         bytes_from_page);
+                        crypto_kunmap(p, 0);
+                        crypto_yield(tfm);
+                        offset = 0;
+                        pg++;
+                        l -= bytes_from_page;
+                } while (l > 0);
+        }
+}
+
+static void final(struct crypto_tfm *tfm, u8 *out)
+{
+        tfm->__crt_alg->cra_digest.dia_final(crypto_tfm_ctx(tfm), out);
+}
+
+static int setkey(struct crypto_tfm *tfm, const u8 *key, unsigned int keylen)
+{
+        u32 flags;
+        if (tfm->__crt_alg->cra_digest.dia_setkey == NULL)
+                return -ENOSYS;
+        return tfm->__crt_alg->cra_digest.dia_setkey(crypto_tfm_ctx(tfm),
+                                                     key, keylen, &flags);
+}
+
+static void digest(struct crypto_tfm *tfm,
+                   struct scatterlist *sg, unsigned int nsg, u8 *out)
+{
+        unsigned int i;
+
+        tfm->crt_digest.dit_init(tfm);
+                
+        for (i = 0; i < nsg; i++) {
+                char *p = crypto_kmap(sg[i].page, 0) + sg[i].offset;
+                tfm->__crt_alg->cra_digest.dia_update(crypto_tfm_ctx(tfm),
+                                                      p, sg[i].length);
+                crypto_kunmap(p, 0);
+                crypto_yield(tfm);
+        }
+        crypto_digest_final(tfm, out);
+}
+
+int crypto_init_digest_flags(struct crypto_tfm *tfm, u32 flags)
+{
+        return flags ? -EINVAL : 0;
+}
+
+int crypto_init_digest_ops(struct crypto_tfm *tfm)
+{
+        struct digest_tfm *ops = &tfm->crt_digest;
+        
+        ops->dit_init   = init;
+        ops->dit_update = update;
+        ops->dit_final  = final;
+        ops->dit_digest = digest;
+        ops->dit_setkey = setkey;
+        
+        return crypto_alloc_hmac_block(tfm);
+}
+
+void crypto_exit_digest_ops(struct crypto_tfm *tfm)
+{
+        crypto_free_hmac_block(tfm);
+}