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authorHerbert Xu <herbert@gondor.apana.org.au>2007-04-16 20:48:54 +1000
committerHerbert Xu <herbert@gondor.apana.org.au>2007-05-02 14:38:31 +1000
commitb5b7f08869340aa8cfa23303f7d195f161479592 (patch)
treedd1f3f00165e7ca31e29a52d64909439cdfab8fd /crypto/ablkcipher.c
parentebc610e5bc76df073221e64e86c3f7533a09ea40 (diff)
downloadlinux-b5b7f08869340aa8cfa23303f7d195f161479592.tar.bz2
[CRYPTO] api: Add async blkcipher type
This patch adds the mid-level interface for asynchronous block ciphers. It also includes a generic queueing mechanism that can be used by other asynchronous crypto operations in future. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Diffstat (limited to 'crypto/ablkcipher.c')
-rw-r--r--crypto/ablkcipher.c83
1 files changed, 83 insertions, 0 deletions
diff --git a/crypto/ablkcipher.c b/crypto/ablkcipher.c
new file mode 100644
index 000000000000..9348ddd84a56
--- /dev/null
+++ b/crypto/ablkcipher.c
@@ -0,0 +1,83 @@
+/*
+ * Asynchronous block chaining cipher operations.
+ *
+ * This is the asynchronous version of blkcipher.c indicating completion
+ * via a callback.
+ *
+ * Copyright (c) 2006 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/module.h>
+#include <linux/seq_file.h>
+
+static int setkey(struct crypto_ablkcipher *tfm, const u8 *key,
+ unsigned int keylen)
+{
+ struct ablkcipher_alg *cipher = crypto_ablkcipher_alg(tfm);
+
+ if (keylen < cipher->min_keysize || keylen > cipher->max_keysize) {
+ crypto_ablkcipher_set_flags(tfm, CRYPTO_TFM_RES_BAD_KEY_LEN);
+ return -EINVAL;
+ }
+
+ return cipher->setkey(tfm, key, keylen);
+}
+
+static unsigned int crypto_ablkcipher_ctxsize(struct crypto_alg *alg, u32 type,
+ u32 mask)
+{
+ return alg->cra_ctxsize;
+}
+
+static int crypto_init_ablkcipher_ops(struct crypto_tfm *tfm, u32 type,
+ u32 mask)
+{
+ struct ablkcipher_alg *alg = &tfm->__crt_alg->cra_ablkcipher;
+ struct ablkcipher_tfm *crt = &tfm->crt_ablkcipher;
+
+ if (alg->ivsize > PAGE_SIZE / 8)
+ return -EINVAL;
+
+ crt->setkey = setkey;
+ crt->encrypt = alg->encrypt;
+ crt->decrypt = alg->decrypt;
+ crt->ivsize = alg->ivsize;
+
+ return 0;
+}
+
+static void crypto_ablkcipher_show(struct seq_file *m, struct crypto_alg *alg)
+ __attribute__ ((unused));
+static void crypto_ablkcipher_show(struct seq_file *m, struct crypto_alg *alg)
+{
+ struct ablkcipher_alg *ablkcipher = &alg->cra_ablkcipher;
+
+ seq_printf(m, "type : ablkcipher\n");
+ seq_printf(m, "blocksize : %u\n", alg->cra_blocksize);
+ seq_printf(m, "min keysize : %u\n", ablkcipher->min_keysize);
+ seq_printf(m, "max keysize : %u\n", ablkcipher->max_keysize);
+ seq_printf(m, "ivsize : %u\n", ablkcipher->ivsize);
+ seq_printf(m, "qlen : %u\n", ablkcipher->queue->qlen);
+ seq_printf(m, "max qlen : %u\n", ablkcipher->queue->max_qlen);
+}
+
+const struct crypto_type crypto_ablkcipher_type = {
+ .ctxsize = crypto_ablkcipher_ctxsize,
+ .init = crypto_init_ablkcipher_ops,
+#ifdef CONFIG_PROC_FS
+ .show = crypto_ablkcipher_show,
+#endif
+};
+EXPORT_SYMBOL_GPL(crypto_ablkcipher_type);
+
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("Asynchronous block chaining cipher type");