Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / crypto / md5.c

diff --git a/kernel/crypto/md5.c b/kernel/crypto/md5.c
new file mode 100644 (file)
index 0000000..36f5e5b
--- /dev/null
+++ b/kernel/crypto/md5.c
@@ -0,0 +1,171 @@
+/* 
+ * Cryptographic API.
+ *
+ * MD5 Message Digest Algorithm (RFC1321).
+ *
+ * Derived from cryptoapi implementation, originally based on the
+ * public domain implementation written by Colin Plumb in 1993.
+ *
+ * Copyright (c) Cryptoapi developers.
+ * 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 <crypto/internal/hash.h>
+#include <crypto/md5.h>
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/string.h>
+#include <linux/types.h>
+#include <linux/cryptohash.h>
+#include <asm/byteorder.h>
+
+/* XXX: this stuff can be optimized */
+static inline void le32_to_cpu_array(u32 *buf, unsigned int words)
+{
+       while (words--) {
+               __le32_to_cpus(buf);
+               buf++;
+       }
+}
+
+static inline void cpu_to_le32_array(u32 *buf, unsigned int words)
+{
+       while (words--) {
+               __cpu_to_le32s(buf);
+               buf++;
+       }
+}
+
+static inline void md5_transform_helper(struct md5_state *ctx)
+{
+       le32_to_cpu_array(ctx->block, sizeof(ctx->block) / sizeof(u32));
+       md5_transform(ctx->hash, ctx->block);
+}
+
+static int md5_init(struct shash_desc *desc)
+{
+       struct md5_state *mctx = shash_desc_ctx(desc);
+
+       mctx->hash[0] = 0x67452301;
+       mctx->hash[1] = 0xefcdab89;
+       mctx->hash[2] = 0x98badcfe;
+       mctx->hash[3] = 0x10325476;
+       mctx->byte_count = 0;
+
+       return 0;
+}
+
+static int md5_update(struct shash_desc *desc, const u8 *data, unsigned int len)
+{
+       struct md5_state *mctx = shash_desc_ctx(desc);
+       const u32 avail = sizeof(mctx->block) - (mctx->byte_count & 0x3f);
+
+       mctx->byte_count += len;
+
+       if (avail > len) {
+               memcpy((char *)mctx->block + (sizeof(mctx->block) - avail),
+                      data, len);
+               return 0;
+       }
+
+       memcpy((char *)mctx->block + (sizeof(mctx->block) - avail),
+              data, avail);
+
+       md5_transform_helper(mctx);
+       data += avail;
+       len -= avail;
+
+       while (len >= sizeof(mctx->block)) {
+               memcpy(mctx->block, data, sizeof(mctx->block));
+               md5_transform_helper(mctx);
+               data += sizeof(mctx->block);
+               len -= sizeof(mctx->block);
+       }
+
+       memcpy(mctx->block, data, len);
+
+       return 0;
+}
+
+static int md5_final(struct shash_desc *desc, u8 *out)
+{
+       struct md5_state *mctx = shash_desc_ctx(desc);
+       const unsigned int offset = mctx->byte_count & 0x3f;
+       char *p = (char *)mctx->block + offset;
+       int padding = 56 - (offset + 1);
+
+       *p++ = 0x80;
+       if (padding < 0) {
+               memset(p, 0x00, padding + sizeof (u64));
+               md5_transform_helper(mctx);
+               p = (char *)mctx->block;
+               padding = 56;
+       }
+
+       memset(p, 0, padding);
+       mctx->block[14] = mctx->byte_count << 3;
+       mctx->block[15] = mctx->byte_count >> 29;
+       le32_to_cpu_array(mctx->block, (sizeof(mctx->block) -
+                         sizeof(u64)) / sizeof(u32));
+       md5_transform(mctx->hash, mctx->block);
+       cpu_to_le32_array(mctx->hash, sizeof(mctx->hash) / sizeof(u32));
+       memcpy(out, mctx->hash, sizeof(mctx->hash));
+       memset(mctx, 0, sizeof(*mctx));
+
+       return 0;
+}
+
+static int md5_export(struct shash_desc *desc, void *out)
+{
+       struct md5_state *ctx = shash_desc_ctx(desc);
+
+       memcpy(out, ctx, sizeof(*ctx));
+       return 0;
+}
+
+static int md5_import(struct shash_desc *desc, const void *in)
+{
+       struct md5_state *ctx = shash_desc_ctx(desc);
+
+       memcpy(ctx, in, sizeof(*ctx));
+       return 0;
+}
+
+static struct shash_alg alg = {
+       .digestsize     =       MD5_DIGEST_SIZE,
+       .init           =       md5_init,
+       .update         =       md5_update,
+       .final          =       md5_final,
+       .export         =       md5_export,
+       .import         =       md5_import,
+       .descsize       =       sizeof(struct md5_state),
+       .statesize      =       sizeof(struct md5_state),
+       .base           =       {
+               .cra_name       =       "md5",
+               .cra_flags      =       CRYPTO_ALG_TYPE_SHASH,
+               .cra_blocksize  =       MD5_HMAC_BLOCK_SIZE,
+               .cra_module     =       THIS_MODULE,
+       }
+};
+
+static int __init md5_mod_init(void)
+{
+       return crypto_register_shash(&alg);
+}
+
+static void __exit md5_mod_fini(void)
+{
+       crypto_unregister_shash(&alg);
+}
+
+module_init(md5_mod_init);
+module_exit(md5_mod_fini);
+
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("MD5 Message Digest Algorithm");
+MODULE_ALIAS_CRYPTO("md5");