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-rw-r--r--crypto/ablkcipher.c46
1 files changed, 46 insertions, 0 deletions
diff --git a/crypto/ablkcipher.c b/crypto/ablkcipher.c
index 0083140304d2..e403d8137ecd 100644
--- a/crypto/ablkcipher.c
+++ b/crypto/ablkcipher.c
@@ -107,6 +107,52 @@ const struct crypto_type crypto_ablkcipher_type = {
};
EXPORT_SYMBOL_GPL(crypto_ablkcipher_type);
+static int no_givdecrypt(struct skcipher_givcrypt_request *req)
+{
+ return -ENOSYS;
+}
+
+static int crypto_init_givcipher_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->givencrypt = alg->givencrypt;
+ crt->givdecrypt = alg->givdecrypt ?: no_givdecrypt;
+ crt->ivsize = alg->ivsize;
+
+ return 0;
+}
+
+static void crypto_givcipher_show(struct seq_file *m, struct crypto_alg *alg)
+ __attribute__ ((unused));
+static void crypto_givcipher_show(struct seq_file *m, struct crypto_alg *alg)
+{
+ struct ablkcipher_alg *ablkcipher = &alg->cra_ablkcipher;
+
+ seq_printf(m, "type : givcipher\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);
+}
+
+const struct crypto_type crypto_givcipher_type = {
+ .ctxsize = crypto_ablkcipher_ctxsize,
+ .init = crypto_init_givcipher_ops,
+#ifdef CONFIG_PROC_FS
+ .show = crypto_givcipher_show,
+#endif
+};
+EXPORT_SYMBOL_GPL(crypto_givcipher_type);
+
int crypto_grab_skcipher(struct crypto_skcipher_spawn *spawn, const char *name,
u32 type, u32 mask)
{
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