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-rw-r--r--crypto/digest.c107
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);
+}