2.4.22

 crypto

diff -urN linux-2.4.21/crypto/hmac.c linux-2.4.22/crypto/hmac.c
--- linux-2.4.21/crypto/hmac.c   1969-12-31 16:00:00.000000000 -0800
+++ linux-2.4.22/crypto/hmac.c   2003-08-25 04:44:40.000000000 -0700
@@ -0,0 +1,134 @@
+/*
+ * Cryptographic API.
+ *
+ * HMAC: Keyed-Hashing for Message Authentication (RFC2104).
+ *
+ * Copyright (c) 2002 James Morris <jmorris@intercode.com.au>
+ *
+ * The HMAC implementation is derived from USAGI.
+ * Copyright (c) 2002 Kazunori Miyazawa <miyazawa@linux-ipv6.org> / USAGI
+ *
+ * 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/highmem.h>
+#include <linux/slab.h>
+#include <asm/scatterlist.h>
+#include "internal.h"
+
+static void hash_key(struct crypto_tfm *tfm, u8 *key, unsigned int keylen)
+{
+   struct scatterlist tmp;
+   
+   tmp.page = virt_to_page(key);
+   tmp.offset = ((long)key & ~PAGE_MASK);
+   tmp.length = keylen;
+   crypto_digest_digest(tfm, &tmp, 1, key);
+      
+}
+
+int crypto_alloc_hmac_block(struct crypto_tfm *tfm)
+{
+   int ret = 0;
+
+   BUG_ON(!crypto_tfm_alg_blocksize(tfm));
+   
+   tfm->crt_digest.dit_hmac_block = kmalloc(crypto_tfm_alg_blocksize(tfm),
+                                            GFP_KERNEL);
+   if (tfm->crt_digest.dit_hmac_block == NULL)
+      ret = -ENOMEM;
+
+   return ret;
+      
+}
+
+void crypto_free_hmac_block(struct crypto_tfm *tfm)
+{
+   if (tfm->crt_digest.dit_hmac_block)
+      kfree(tfm->crt_digest.dit_hmac_block);
+}
+
+void crypto_hmac_init(struct crypto_tfm *tfm, u8 *key, unsigned int *keylen)
+{
+   unsigned int i;
+   struct scatterlist tmp;
+   char *ipad = tfm->crt_digest.dit_hmac_block;
+   
+   if (*keylen > crypto_tfm_alg_blocksize(tfm)) {
+      hash_key(tfm, key, *keylen);
+      *keylen = crypto_tfm_alg_digestsize(tfm);
+   }
+
+   memset(ipad, 0, crypto_tfm_alg_blocksize(tfm));
+   memcpy(ipad, key, *keylen);
+
+   for (i = 0; i < crypto_tfm_alg_blocksize(tfm); i++)
+      ipad[i] ^= 0x36;
+
+   tmp.page = virt_to_page(ipad);
+   tmp.offset = ((long)ipad & ~PAGE_MASK);
+   tmp.length = crypto_tfm_alg_blocksize(tfm);
+   
+   crypto_digest_init(tfm);
+   crypto_digest_update(tfm, &tmp, 1);
+}
+
+void crypto_hmac_update(struct crypto_tfm *tfm,
+                        struct scatterlist *sg, unsigned int nsg)
+{
+   crypto_digest_update(tfm, sg, nsg);
+}
+
+void crypto_hmac_final(struct crypto_tfm *tfm, u8 *key,
+                       unsigned int *keylen, u8 *out)
+{
+   unsigned int i;
+   struct scatterlist tmp;
+   char *opad = tfm->crt_digest.dit_hmac_block;
+   
+   if (*keylen > crypto_tfm_alg_blocksize(tfm)) {
+      hash_key(tfm, key, *keylen);
+      *keylen = crypto_tfm_alg_digestsize(tfm);
+   }
+
+   crypto_digest_final(tfm, out);
+
+   memset(opad, 0, crypto_tfm_alg_blocksize(tfm));
+   memcpy(opad, key, *keylen);
+      
+   for (i = 0; i < crypto_tfm_alg_blocksize(tfm); i++)
+      opad[i] ^= 0x5c;
+
+   tmp.page = virt_to_page(opad);
+   tmp.offset = ((long)opad & ~PAGE_MASK);
+   tmp.length = crypto_tfm_alg_blocksize(tfm);
+
+   crypto_digest_init(tfm);
+   crypto_digest_update(tfm, &tmp, 1);
+   
+   tmp.page = virt_to_page(out);
+   tmp.offset = ((long)out & ~PAGE_MASK);
+   tmp.length = crypto_tfm_alg_digestsize(tfm);
+   
+   crypto_digest_update(tfm, &tmp, 1);
+   crypto_digest_final(tfm, out);
+}
+
+void crypto_hmac(struct crypto_tfm *tfm, u8 *key, unsigned int *keylen,
+                 struct scatterlist *sg, unsigned int nsg, u8 *out)
+{
+   crypto_hmac_init(tfm, key, keylen);
+   crypto_hmac_update(tfm, sg, nsg);
+   crypto_hmac_final(tfm, key, keylen, out);
+}
+
+EXPORT_SYMBOL_GPL(crypto_hmac_init);
+EXPORT_SYMBOL_GPL(crypto_hmac_update);
+EXPORT_SYMBOL_GPL(crypto_hmac_final);
+EXPORT_SYMBOL_GPL(crypto_hmac);
+