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authorLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
commit1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch)
tree0bba044c4ce775e45a88a51686b5d9f90697ea9d /crypto/hmac.c
downloadlinux-linaro-android-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.tar.gz
Linux-2.6.12-rc2
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
Diffstat (limited to 'crypto/hmac.c')
-rw-r--r--crypto/hmac.c134
1 files changed, 134 insertions, 0 deletions
diff --git a/crypto/hmac.c b/crypto/hmac.c
new file mode 100644
index 00000000000..847df9263e1
--- /dev/null
+++ b/crypto/hmac.c
@@ -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 = offset_in_page(key);
+ 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 = offset_in_page(ipad);
+ 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 = offset_in_page(opad);
+ 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 = offset_in_page(out);
+ 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);
+