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-rw-r--r--crypto/aead.c101
1 files changed, 101 insertions, 0 deletions
diff --git a/crypto/aead.c b/crypto/aead.c
new file mode 100644
index 000000000000..84a3501fb478
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+++ b/crypto/aead.c
@@ -0,0 +1,101 @@
+/*
+ * AEAD: Authenticated Encryption with Associated Data
+ *
+ * This file provides API support for AEAD algorithms.
+ *
+ * Copyright (c) 2007 Herbert Xu <herbert@gondor.apana.org.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/algapi.h>
+#include <linux/errno.h>
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/seq_file.h>
+
+static int setkey_unaligned(struct crypto_aead *tfm, const u8 *key,
+ unsigned int keylen)
+{
+ struct aead_alg *aead = crypto_aead_alg(tfm);
+ unsigned long alignmask = crypto_aead_alignmask(tfm);
+ int ret;
+ u8 *buffer, *alignbuffer;
+ unsigned long absize;
+
+ absize = keylen + alignmask;
+ buffer = kmalloc(absize, GFP_ATOMIC);
+ if (!buffer)
+ return -ENOMEM;
+
+ alignbuffer = (u8 *)ALIGN((unsigned long)buffer, alignmask + 1);
+ memcpy(alignbuffer, key, keylen);
+ ret = aead->setkey(tfm, alignbuffer, keylen);
+ memset(alignbuffer, 0, keylen);
+ kfree(buffer);
+ return ret;
+}
+
+static int setkey(struct crypto_aead *tfm, const u8 *key, unsigned int keylen)
+{
+ struct aead_alg *aead = crypto_aead_alg(tfm);
+ unsigned long alignmask = crypto_aead_alignmask(tfm);
+
+ if ((unsigned long)key & alignmask)
+ return setkey_unaligned(tfm, key, keylen);
+
+ return aead->setkey(tfm, key, keylen);
+}
+
+static unsigned int crypto_aead_ctxsize(struct crypto_alg *alg, u32 type,
+ u32 mask)
+{
+ return alg->cra_ctxsize;
+}
+
+static int crypto_init_aead_ops(struct crypto_tfm *tfm, u32 type, u32 mask)
+{
+ struct aead_alg *alg = &tfm->__crt_alg->cra_aead;
+ struct aead_tfm *crt = &tfm->crt_aead;
+
+ if (max(alg->authsize, alg->ivsize) > PAGE_SIZE / 8)
+ return -EINVAL;
+
+ crt->setkey = setkey;
+ crt->encrypt = alg->encrypt;
+ crt->decrypt = alg->decrypt;
+ crt->ivsize = alg->ivsize;
+ crt->authsize = alg->authsize;
+
+ return 0;
+}
+
+static void crypto_aead_show(struct seq_file *m, struct crypto_alg *alg)
+ __attribute__ ((unused));
+static void crypto_aead_show(struct seq_file *m, struct crypto_alg *alg)
+{
+ struct aead_alg *aead = &alg->cra_aead;
+
+ seq_printf(m, "type : aead\n");
+ seq_printf(m, "blocksize : %u\n", alg->cra_blocksize);
+ seq_printf(m, "ivsize : %u\n", aead->ivsize);
+ seq_printf(m, "authsize : %u\n", aead->authsize);
+}
+
+const struct crypto_type crypto_aead_type = {
+ .ctxsize = crypto_aead_ctxsize,
+ .init = crypto_init_aead_ops,
+#ifdef CONFIG_PROC_FS
+ .show = crypto_aead_show,
+#endif
+};
+EXPORT_SYMBOL_GPL(crypto_aead_type);
+
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("Authenticated Encryption with Associated Data (AEAD)");