X-Git-Url: http://ftp.safe.ca/?a=blobdiff_plain;f=arch%2Fs390%2Fcrypto%2Faes_s390.c;h=e33f32b54c080392f1cf1620fdf4ff86a083b041;hb=d1846b0e7a1dc26f90fb0d75641aca9abb077ef9;hp=512669691ad01b9513ce5c283d5d9db6e75e5aed;hpb=f8246af005d56b73f4f04304fc5b6fd9878af4ef;p=safe%2Fjmp%2Flinux-2.6 diff --git a/arch/s390/crypto/aes_s390.c b/arch/s390/crypto/aes_s390.c index 5126696..e33f32b 100644 --- a/arch/s390/crypto/aes_s390.c +++ b/arch/s390/crypto/aes_s390.c @@ -6,6 +6,7 @@ * s390 Version: * Copyright IBM Corp. 2005,2007 * Author(s): Jan Glauber (jang@de.ibm.com) + * Sebastian Siewior (sebastian@breakpoint.cc> SW-Fallback * * Derived from "crypto/aes_generic.c" * @@ -16,17 +17,13 @@ * */ +#include #include +#include #include #include #include "crypt_s390.h" -#define AES_MIN_KEY_SIZE 16 -#define AES_MAX_KEY_SIZE 32 - -/* data block size for all key lengths */ -#define AES_BLOCK_SIZE 16 - #define AES_KEYLEN_128 1 #define AES_KEYLEN_192 2 #define AES_KEYLEN_256 4 @@ -39,45 +36,89 @@ struct s390_aes_ctx { long enc; long dec; int key_len; + union { + struct crypto_blkcipher *blk; + struct crypto_cipher *cip; + } fallback; }; -static int aes_set_key(struct crypto_tfm *tfm, const u8 *in_key, - unsigned int key_len) +/* + * Check if the key_len is supported by the HW. + * Returns 0 if it is, a positive number if it is not and software fallback is + * required or a negative number in case the key size is not valid + */ +static int need_fallback(unsigned int key_len) { - struct s390_aes_ctx *sctx = crypto_tfm_ctx(tfm); - u32 *flags = &tfm->crt_flags; - switch (key_len) { case 16: if (!(keylen_flag & AES_KEYLEN_128)) - goto fail; + return 1; break; case 24: if (!(keylen_flag & AES_KEYLEN_192)) - goto fail; - + return 1; break; case 32: if (!(keylen_flag & AES_KEYLEN_256)) - goto fail; + return 1; break; default: - goto fail; + return -1; break; } + return 0; +} + +static int setkey_fallback_cip(struct crypto_tfm *tfm, const u8 *in_key, + unsigned int key_len) +{ + struct s390_aes_ctx *sctx = crypto_tfm_ctx(tfm); + int ret; + + sctx->fallback.blk->base.crt_flags &= ~CRYPTO_TFM_REQ_MASK; + sctx->fallback.blk->base.crt_flags |= (tfm->crt_flags & + CRYPTO_TFM_REQ_MASK); + + ret = crypto_cipher_setkey(sctx->fallback.cip, in_key, key_len); + if (ret) { + tfm->crt_flags &= ~CRYPTO_TFM_RES_MASK; + tfm->crt_flags |= (sctx->fallback.blk->base.crt_flags & + CRYPTO_TFM_RES_MASK); + } + return ret; +} + +static int aes_set_key(struct crypto_tfm *tfm, const u8 *in_key, + unsigned int key_len) +{ + struct s390_aes_ctx *sctx = crypto_tfm_ctx(tfm); + u32 *flags = &tfm->crt_flags; + int ret; + + ret = need_fallback(key_len); + if (ret < 0) { + *flags |= CRYPTO_TFM_RES_BAD_KEY_LEN; + return -EINVAL; + } sctx->key_len = key_len; - memcpy(sctx->key, in_key, key_len); - return 0; -fail: - *flags |= CRYPTO_TFM_RES_BAD_KEY_LEN; - return -EINVAL; + if (!ret) { + memcpy(sctx->key, in_key, key_len); + return 0; + } + + return setkey_fallback_cip(tfm, in_key, key_len); } static void aes_encrypt(struct crypto_tfm *tfm, u8 *out, const u8 *in) { const struct s390_aes_ctx *sctx = crypto_tfm_ctx(tfm); + if (unlikely(need_fallback(sctx->key_len))) { + crypto_cipher_encrypt_one(sctx->fallback.cip, out, in); + return; + } + switch (sctx->key_len) { case 16: crypt_s390_km(KM_AES_128_ENCRYPT, &sctx->key, out, in, @@ -98,6 +139,11 @@ static void aes_decrypt(struct crypto_tfm *tfm, u8 *out, const u8 *in) { const struct s390_aes_ctx *sctx = crypto_tfm_ctx(tfm); + if (unlikely(need_fallback(sctx->key_len))) { + crypto_cipher_decrypt_one(sctx->fallback.cip, out, in); + return; + } + switch (sctx->key_len) { case 16: crypt_s390_km(KM_AES_128_DECRYPT, &sctx->key, out, in, @@ -114,6 +160,29 @@ static void aes_decrypt(struct crypto_tfm *tfm, u8 *out, const u8 *in) } } +static int fallback_init_cip(struct crypto_tfm *tfm) +{ + const char *name = tfm->__crt_alg->cra_name; + struct s390_aes_ctx *sctx = crypto_tfm_ctx(tfm); + + sctx->fallback.cip = crypto_alloc_cipher(name, 0, + CRYPTO_ALG_ASYNC | CRYPTO_ALG_NEED_FALLBACK); + + if (IS_ERR(sctx->fallback.cip)) { + printk(KERN_ERR "Error allocating fallback algo %s\n", name); + return PTR_ERR(sctx->fallback.blk); + } + + return 0; +} + +static void fallback_exit_cip(struct crypto_tfm *tfm) +{ + struct s390_aes_ctx *sctx = crypto_tfm_ctx(tfm); + + crypto_free_cipher(sctx->fallback.cip); + sctx->fallback.cip = NULL; +} static struct crypto_alg aes_alg = { .cra_name = "aes", @@ -125,6 +194,8 @@ static struct crypto_alg aes_alg = { .cra_ctxsize = sizeof(struct s390_aes_ctx), .cra_module = THIS_MODULE, .cra_list = LIST_HEAD_INIT(aes_alg.cra_list), + .cra_init = fallback_init_cip, + .cra_exit = fallback_exit_cip, .cra_u = { .cipher = { .cia_min_keysize = AES_MIN_KEY_SIZE, @@ -136,10 +207,70 @@ static struct crypto_alg aes_alg = { } }; +static int setkey_fallback_blk(struct crypto_tfm *tfm, const u8 *key, + unsigned int len) +{ + struct s390_aes_ctx *sctx = crypto_tfm_ctx(tfm); + unsigned int ret; + + sctx->fallback.blk->base.crt_flags &= ~CRYPTO_TFM_REQ_MASK; + sctx->fallback.blk->base.crt_flags |= (tfm->crt_flags & + CRYPTO_TFM_REQ_MASK); + + ret = crypto_blkcipher_setkey(sctx->fallback.blk, key, len); + if (ret) { + tfm->crt_flags &= ~CRYPTO_TFM_RES_MASK; + tfm->crt_flags |= (sctx->fallback.blk->base.crt_flags & + CRYPTO_TFM_RES_MASK); + } + return ret; +} + +static int fallback_blk_dec(struct blkcipher_desc *desc, + struct scatterlist *dst, struct scatterlist *src, + unsigned int nbytes) +{ + unsigned int ret; + struct crypto_blkcipher *tfm; + struct s390_aes_ctx *sctx = crypto_blkcipher_ctx(desc->tfm); + + tfm = desc->tfm; + desc->tfm = sctx->fallback.blk; + + ret = crypto_blkcipher_decrypt_iv(desc, dst, src, nbytes); + + desc->tfm = tfm; + return ret; +} + +static int fallback_blk_enc(struct blkcipher_desc *desc, + struct scatterlist *dst, struct scatterlist *src, + unsigned int nbytes) +{ + unsigned int ret; + struct crypto_blkcipher *tfm; + struct s390_aes_ctx *sctx = crypto_blkcipher_ctx(desc->tfm); + + tfm = desc->tfm; + desc->tfm = sctx->fallback.blk; + + ret = crypto_blkcipher_encrypt_iv(desc, dst, src, nbytes); + + desc->tfm = tfm; + return ret; +} + static int ecb_aes_set_key(struct crypto_tfm *tfm, const u8 *in_key, unsigned int key_len) { struct s390_aes_ctx *sctx = crypto_tfm_ctx(tfm); + int ret; + + ret = need_fallback(key_len); + if (ret > 0) { + sctx->key_len = key_len; + return setkey_fallback_blk(tfm, in_key, key_len); + } switch (key_len) { case 16: @@ -188,6 +319,9 @@ static int ecb_aes_encrypt(struct blkcipher_desc *desc, struct s390_aes_ctx *sctx = crypto_blkcipher_ctx(desc->tfm); struct blkcipher_walk walk; + if (unlikely(need_fallback(sctx->key_len))) + return fallback_blk_enc(desc, dst, src, nbytes); + blkcipher_walk_init(&walk, dst, src, nbytes); return ecb_aes_crypt(desc, sctx->enc, sctx->key, &walk); } @@ -199,10 +333,37 @@ static int ecb_aes_decrypt(struct blkcipher_desc *desc, struct s390_aes_ctx *sctx = crypto_blkcipher_ctx(desc->tfm); struct blkcipher_walk walk; + if (unlikely(need_fallback(sctx->key_len))) + return fallback_blk_dec(desc, dst, src, nbytes); + blkcipher_walk_init(&walk, dst, src, nbytes); return ecb_aes_crypt(desc, sctx->dec, sctx->key, &walk); } +static int fallback_init_blk(struct crypto_tfm *tfm) +{ + const char *name = tfm->__crt_alg->cra_name; + struct s390_aes_ctx *sctx = crypto_tfm_ctx(tfm); + + sctx->fallback.blk = crypto_alloc_blkcipher(name, 0, + CRYPTO_ALG_ASYNC | CRYPTO_ALG_NEED_FALLBACK); + + if (IS_ERR(sctx->fallback.blk)) { + printk(KERN_ERR "Error allocating fallback algo %s\n", name); + return PTR_ERR(sctx->fallback.blk); + } + + return 0; +} + +static void fallback_exit_blk(struct crypto_tfm *tfm) +{ + struct s390_aes_ctx *sctx = crypto_tfm_ctx(tfm); + + crypto_free_blkcipher(sctx->fallback.blk); + sctx->fallback.blk = NULL; +} + static struct crypto_alg ecb_aes_alg = { .cra_name = "ecb(aes)", .cra_driver_name = "ecb-aes-s390", @@ -214,6 +375,8 @@ static struct crypto_alg ecb_aes_alg = { .cra_type = &crypto_blkcipher_type, .cra_module = THIS_MODULE, .cra_list = LIST_HEAD_INIT(ecb_aes_alg.cra_list), + .cra_init = fallback_init_blk, + .cra_exit = fallback_exit_blk, .cra_u = { .blkcipher = { .min_keysize = AES_MIN_KEY_SIZE, @@ -229,6 +392,13 @@ static int cbc_aes_set_key(struct crypto_tfm *tfm, const u8 *in_key, unsigned int key_len) { struct s390_aes_ctx *sctx = crypto_tfm_ctx(tfm); + int ret; + + ret = need_fallback(key_len); + if (ret > 0) { + sctx->key_len = key_len; + return setkey_fallback_blk(tfm, in_key, key_len); + } switch (key_len) { case 16: @@ -283,6 +453,9 @@ static int cbc_aes_encrypt(struct blkcipher_desc *desc, struct s390_aes_ctx *sctx = crypto_blkcipher_ctx(desc->tfm); struct blkcipher_walk walk; + if (unlikely(need_fallback(sctx->key_len))) + return fallback_blk_enc(desc, dst, src, nbytes); + blkcipher_walk_init(&walk, dst, src, nbytes); return cbc_aes_crypt(desc, sctx->enc, sctx->iv, &walk); } @@ -294,6 +467,9 @@ static int cbc_aes_decrypt(struct blkcipher_desc *desc, struct s390_aes_ctx *sctx = crypto_blkcipher_ctx(desc->tfm); struct blkcipher_walk walk; + if (unlikely(need_fallback(sctx->key_len))) + return fallback_blk_dec(desc, dst, src, nbytes); + blkcipher_walk_init(&walk, dst, src, nbytes); return cbc_aes_crypt(desc, sctx->dec, sctx->iv, &walk); } @@ -309,6 +485,8 @@ static struct crypto_alg cbc_aes_alg = { .cra_type = &crypto_blkcipher_type, .cra_module = THIS_MODULE, .cra_list = LIST_HEAD_INIT(cbc_aes_alg.cra_list), + .cra_init = fallback_init_blk, + .cra_exit = fallback_exit_blk, .cra_u = { .blkcipher = { .min_keysize = AES_MIN_KEY_SIZE, @@ -321,7 +499,7 @@ static struct crypto_alg cbc_aes_alg = { } }; -static int __init aes_init(void) +static int __init aes_s390_init(void) { int ret; @@ -336,14 +514,10 @@ static int __init aes_init(void) return -EOPNOTSUPP; /* z9 109 and z9 BC/EC only support 128 bit key length */ - if (keylen_flag == AES_KEYLEN_128) { - aes_alg.cra_u.cipher.cia_max_keysize = AES_MIN_KEY_SIZE; - ecb_aes_alg.cra_u.blkcipher.max_keysize = AES_MIN_KEY_SIZE; - cbc_aes_alg.cra_u.blkcipher.max_keysize = AES_MIN_KEY_SIZE; + if (keylen_flag == AES_KEYLEN_128) printk(KERN_INFO - "aes_s390: hardware acceleration only available for" + "aes_s390: hardware acceleration only available for " "128 bit keys\n"); - } ret = crypto_register_alg(&aes_alg); if (ret) @@ -368,18 +542,17 @@ aes_err: goto out; } -static void __exit aes_fini(void) +static void __exit aes_s390_fini(void) { crypto_unregister_alg(&cbc_aes_alg); crypto_unregister_alg(&ecb_aes_alg); crypto_unregister_alg(&aes_alg); } -module_init(aes_init); -module_exit(aes_fini); +module_init(aes_s390_init); +module_exit(aes_s390_fini); MODULE_ALIAS("aes"); MODULE_DESCRIPTION("Rijndael (AES) Cipher Algorithm"); MODULE_LICENSE("GPL"); -