1 files changed, 142 insertions, 0 deletions

diff --git a/crypto/sha1_generic.c b/crypto/sha1_generic.c
new file mode 100644
index 000000000000..70364dd5c45a
--- /dev/null
+++ b/crypto/sha1_generic.c
@@ -0,0 +1,142 @@
+/*
+ * Cryptographic API.
+ *
+ * SHA1 Secure Hash Algorithm.
+ *
+ * Derived from cryptoapi implementation, adapted for in-place
+ * scatterlist interface.
+ *
+ * Copyright (c) Alan Smithee.
+ * Copyright (c) Andrew McDonald <andrew@mcdonald.org.uk>
+ * Copyright (c) Jean-Francois Dive <jef@linuxbe.org>
+ *
+ * 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/init.h>
+#include <linux/module.h>
+#include <linux/mm.h>
+#include <linux/crypto.h>
+#include <linux/cryptohash.h>
+#include <linux/types.h>
+#include <asm/scatterlist.h>
+#include <asm/byteorder.h>
+
+#define SHA1_DIGEST_SIZE        20
+#define SHA1_HMAC_BLOCK_SIZE    64
+
+struct sha1_ctx {
+        u64 count;
+        u32 state[5];
+        u8 buffer[64];
+};
+
+static void sha1_init(struct crypto_tfm *tfm)
+{
+        struct sha1_ctx *sctx = crypto_tfm_ctx(tfm);
+        static const struct sha1_ctx initstate = {
+          0,
+          { 0x67452301, 0xEFCDAB89, 0x98BADCFE, 0x10325476, 0xC3D2E1F0 },
+          { 0, }
+        };
+
+        *sctx = initstate;
+}
+
+static void sha1_update(struct crypto_tfm *tfm, const u8 *data,
+                        unsigned int len)
+{
+        struct sha1_ctx *sctx = crypto_tfm_ctx(tfm);
+        unsigned int partial, done;
+        const u8 *src;
+
+        partial = sctx->count & 0x3f;
+        sctx->count += len;
+        done = 0;
+        src = data;
+
+        if ((partial + len) > 63) {
+                u32 temp[SHA_WORKSPACE_WORDS];
+
+                if (partial) {
+                        done = -partial;
+                        memcpy(sctx->buffer + partial, data, done + 64);
+                        src = sctx->buffer;
+                }
+
+                do {
+                        sha_transform(sctx->state, src, temp);
+                        done += 64;
+                        src = data + done;
+                } while (done + 63 < len);
+
+                memset(temp, 0, sizeof(temp));
+                partial = 0;
+        }
+        memcpy(sctx->buffer + partial, src, len - done);
+}
+
+
+/* Add padding and return the message digest. */
+static void sha1_final(struct crypto_tfm *tfm, u8 *out)
+{
+        struct sha1_ctx *sctx = crypto_tfm_ctx(tfm);
+        __be32 *dst = (__be32 *)out;
+        u32 i, index, padlen;
+        __be64 bits;
+        static const u8 padding[64] = { 0x80, };
+
+        bits = cpu_to_be64(sctx->count << 3);
+
+        /* Pad out to 56 mod 64 */
+        index = sctx->count & 0x3f;
+        padlen = (index < 56) ? (56 - index) : ((64+56) - index);
+        sha1_update(tfm, padding, padlen);
+
+        /* Append length */
+        sha1_update(tfm, (const u8 *)&bits, sizeof(bits));
+
+        /* Store state in digest */
+        for (i = 0; i < 5; i++)
+                dst[i] = cpu_to_be32(sctx->state[i]);
+
+        /* Wipe context */
+        memset(sctx, 0, sizeof *sctx);
+}
+
+static struct crypto_alg alg = {
+        .cra_name       =       "sha1",
+        .cra_driver_name=       "sha1-generic",
+        .cra_flags      =       CRYPTO_ALG_TYPE_DIGEST,
+        .cra_blocksize  =       SHA1_HMAC_BLOCK_SIZE,
+        .cra_ctxsize    =       sizeof(struct sha1_ctx),
+        .cra_module     =       THIS_MODULE,
+        .cra_alignmask  =       3,
+        .cra_list       =       LIST_HEAD_INIT(alg.cra_list),
+        .cra_u          =       { .digest = {
+        .dia_digestsize =       SHA1_DIGEST_SIZE,
+        .dia_init       =       sha1_init,
+        .dia_update     =       sha1_update,
+        .dia_final      =       sha1_final } }
+};
+
+static int __init init(void)
+{
+        return crypto_register_alg(&alg);
+}
+
+static void __exit fini(void)
+{
+        crypto_unregister_alg(&alg);
+}
+
+module_init(init);
+module_exit(fini);
+
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("SHA1 Secure Hash Algorithm");
+
+MODULE_ALIAS("sha1");