diff options
Diffstat (limited to 'crypto')
| -rw-r--r-- | crypto/Kconfig | 4 | ||||
| -rw-r--r-- | crypto/Makefile | 1 | ||||
| -rw-r--r-- | crypto/aead.c | 101 |
3 files changed, 106 insertions, 0 deletions
diff --git a/crypto/Kconfig b/crypto/Kconfig index 981497c8975..f42bc7715f4 100644 --- a/crypto/Kconfig +++ b/crypto/Kconfig @@ -28,6 +28,10 @@ config CRYPTO_ABLKCIPHER tristate select CRYPTO_BLKCIPHER +config CRYPTO_AEAD + tristate + select CRYPTO_ALGAPI + config CRYPTO_BLKCIPHER tristate select CRYPTO_ALGAPI diff --git a/crypto/Makefile b/crypto/Makefile index a070dcc074f..9821c5ba054 100644 --- a/crypto/Makefile +++ b/crypto/Makefile @@ -9,6 +9,7 @@ crypto_algapi-objs := algapi.o $(crypto_algapi-y) obj-$(CONFIG_CRYPTO_ALGAPI) += crypto_algapi.o obj-$(CONFIG_CRYPTO_ABLKCIPHER) += ablkcipher.o +obj-$(CONFIG_CRYPTO_AEAD) += aead.o obj-$(CONFIG_CRYPTO_BLKCIPHER) += blkcipher.o crypto_hash-objs := hash.o diff --git a/crypto/aead.c b/crypto/aead.c new file mode 100644 index 00000000000..84a3501fb47 --- /dev/null +++ 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)"); |