Add the rt linux 4.1.3-rt3 as base

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

diff --git a/kernel/crypto/michael_mic.c b/kernel/crypto/michael_mic.c
new file mode 100644 (file)
index 0000000..46195e0
--- /dev/null
+++ b/kernel/crypto/michael_mic.c
@@ -0,0 +1,187 @@
+/*
+ * Cryptographic API
+ *
+ * Michael MIC (IEEE 802.11i/TKIP) keyed digest
+ *
+ * Copyright (c) 2004 Jouni Malinen <j@w1.fi>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+#include <crypto/internal/hash.h>
+#include <asm/byteorder.h>
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/string.h>
+#include <linux/types.h>
+
+
+struct michael_mic_ctx {
+       u32 l, r;
+};
+
+struct michael_mic_desc_ctx {
+       u8 pending[4];
+       size_t pending_len;
+
+       u32 l, r;
+};
+
+static inline u32 xswap(u32 val)
+{
+       return ((val & 0x00ff00ff) << 8) | ((val & 0xff00ff00) >> 8);
+}
+
+
+#define michael_block(l, r)    \
+do {                           \
+       r ^= rol32(l, 17);      \
+       l += r;                 \
+       r ^= xswap(l);          \
+       l += r;                 \
+       r ^= rol32(l, 3);       \
+       l += r;                 \
+       r ^= ror32(l, 2);       \
+       l += r;                 \
+} while (0)
+
+
+static int michael_init(struct shash_desc *desc)
+{
+       struct michael_mic_desc_ctx *mctx = shash_desc_ctx(desc);
+       struct michael_mic_ctx *ctx = crypto_shash_ctx(desc->tfm);
+       mctx->pending_len = 0;
+       mctx->l = ctx->l;
+       mctx->r = ctx->r;
+
+       return 0;
+}
+
+
+static int michael_update(struct shash_desc *desc, const u8 *data,
+                          unsigned int len)
+{
+       struct michael_mic_desc_ctx *mctx = shash_desc_ctx(desc);
+       const __le32 *src;
+
+       if (mctx->pending_len) {
+               int flen = 4 - mctx->pending_len;
+               if (flen > len)
+                       flen = len;
+               memcpy(&mctx->pending[mctx->pending_len], data, flen);
+               mctx->pending_len += flen;
+               data += flen;
+               len -= flen;
+
+               if (mctx->pending_len < 4)
+                       return 0;
+
+               src = (const __le32 *)mctx->pending;
+               mctx->l ^= le32_to_cpup(src);
+               michael_block(mctx->l, mctx->r);
+               mctx->pending_len = 0;
+       }
+
+       src = (const __le32 *)data;
+
+       while (len >= 4) {
+               mctx->l ^= le32_to_cpup(src++);
+               michael_block(mctx->l, mctx->r);
+               len -= 4;
+       }
+
+       if (len > 0) {
+               mctx->pending_len = len;
+               memcpy(mctx->pending, src, len);
+       }
+
+       return 0;
+}
+
+
+static int michael_final(struct shash_desc *desc, u8 *out)
+{
+       struct michael_mic_desc_ctx *mctx = shash_desc_ctx(desc);
+       u8 *data = mctx->pending;
+       __le32 *dst = (__le32 *)out;
+
+       /* Last block and padding (0x5a, 4..7 x 0) */
+       switch (mctx->pending_len) {
+       case 0:
+               mctx->l ^= 0x5a;
+               break;
+       case 1:
+               mctx->l ^= data[0] | 0x5a00;
+               break;
+       case 2:
+               mctx->l ^= data[0] | (data[1] << 8) | 0x5a0000;
+               break;
+       case 3:
+               mctx->l ^= data[0] | (data[1] << 8) | (data[2] << 16) |
+                       0x5a000000;
+               break;
+       }
+       michael_block(mctx->l, mctx->r);
+       /* l ^= 0; */
+       michael_block(mctx->l, mctx->r);
+
+       dst[0] = cpu_to_le32(mctx->l);
+       dst[1] = cpu_to_le32(mctx->r);
+
+       return 0;
+}
+
+
+static int michael_setkey(struct crypto_shash *tfm, const u8 *key,
+                         unsigned int keylen)
+{
+       struct michael_mic_ctx *mctx = crypto_shash_ctx(tfm);
+
+       const __le32 *data = (const __le32 *)key;
+
+       if (keylen != 8) {
+               crypto_shash_set_flags(tfm, CRYPTO_TFM_RES_BAD_KEY_LEN);
+               return -EINVAL;
+       }
+
+       mctx->l = le32_to_cpu(data[0]);
+       mctx->r = le32_to_cpu(data[1]);
+       return 0;
+}
+
+static struct shash_alg alg = {
+       .digestsize             =       8,
+       .setkey                 =       michael_setkey,
+       .init                   =       michael_init,
+       .update                 =       michael_update,
+       .final                  =       michael_final,
+       .descsize               =       sizeof(struct michael_mic_desc_ctx),
+       .base                   =       {
+               .cra_name               =       "michael_mic",
+               .cra_blocksize          =       8,
+               .cra_alignmask          =       3,
+               .cra_ctxsize            =       sizeof(struct michael_mic_ctx),
+               .cra_module             =       THIS_MODULE,
+       }
+};
+
+static int __init michael_mic_init(void)
+{
+       return crypto_register_shash(&alg);
+}
+
+
+static void __exit michael_mic_exit(void)
+{
+       crypto_unregister_shash(&alg);
+}
+
+
+module_init(michael_mic_init);
+module_exit(michael_mic_exit);
+
+MODULE_LICENSE("GPL v2");
+MODULE_DESCRIPTION("Michael MIC");
+MODULE_AUTHOR("Jouni Malinen <j@w1.fi>");
+MODULE_ALIAS_CRYPTO("michael_mic");