sparc64: Add CAMELLIA driver making use of the new camellia opcodes.

Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 318 insertions, 0 deletions

diff --git a/arch/sparc/crypto/camellia_glue.c b/arch/sparc/crypto/camellia_glue.c
new file mode 100644
index 000000000000..c258cc550a6b
--- /dev/null
+++ b/arch/sparc/crypto/camellia_glue.c
@@ -0,0 +1,318 @@
+/* Glue code for CAMELLIA encryption optimized for sparc64 crypto opcodes.
+ *
+ * Copyright (C) 2012 David S. Miller <davem@davemloft.net>
+ */
+
+#include <linux/crypto.h>
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/mm.h>
+#include <linux/types.h>
+#include <crypto/algapi.h>
+
+#include <asm/fpumacro.h>
+#include <asm/pstate.h>
+#include <asm/elf.h>
+
+#define CAMELLIA_MIN_KEY_SIZE        16
+#define CAMELLIA_MAX_KEY_SIZE        32
+#define CAMELLIA_BLOCK_SIZE          16
+#define CAMELLIA_TABLE_BYTE_LEN     272
+
+struct camellia_sparc64_ctx {
+        u64 encrypt_key[CAMELLIA_TABLE_BYTE_LEN / sizeof(u64)];
+        u64 decrypt_key[CAMELLIA_TABLE_BYTE_LEN / sizeof(u64)];
+        int key_len;
+};
+
+extern void camellia_sparc64_key_expand(const u32 *in_key, u64 *encrypt_key,
+                                        unsigned int key_len, u64 *decrypt_key);
+
+static int camellia_set_key(struct crypto_tfm *tfm, const u8 *_in_key,
+                            unsigned int key_len)
+{
+        struct camellia_sparc64_ctx *ctx = crypto_tfm_ctx(tfm);
+        const u32 *in_key = (const u32 *) _in_key;
+        u32 *flags = &tfm->crt_flags;
+
+        if (key_len != 16 && key_len != 24 && key_len != 32) {
+                *flags |= CRYPTO_TFM_RES_BAD_KEY_LEN;
+                return -EINVAL;
+        }
+
+        ctx->key_len = key_len;
+
+        camellia_sparc64_key_expand(in_key, &ctx->encrypt_key[0],
+                                    key_len, &ctx->decrypt_key[0]);
+        return 0;
+}
+
+extern void camellia_sparc64_crypt(const u64 *key, const u32 *input,
+                                   u32 *output, unsigned int key_len);
+
+static void camellia_encrypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src)
+{
+        struct camellia_sparc64_ctx *ctx = crypto_tfm_ctx(tfm);
+
+        camellia_sparc64_crypt(&ctx->encrypt_key[0],
+                               (const u32 *) src,
+                               (u32 *) dst, ctx->key_len);
+}
+
+static void camellia_decrypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src)
+{
+        struct camellia_sparc64_ctx *ctx = crypto_tfm_ctx(tfm);
+
+        camellia_sparc64_crypt(&ctx->decrypt_key[0],
+                               (const u32 *) src,
+                               (u32 *) dst, ctx->key_len);
+}
+
+extern void camellia_sparc64_load_keys(const u64 *key, unsigned int key_len);
+
+typedef void ecb_crypt_op(const u64 *input, u64 *output, unsigned int len,
+                          const u64 *key);
+
+extern ecb_crypt_op camellia_sparc64_ecb_crypt_3_grand_rounds;
+extern ecb_crypt_op camellia_sparc64_ecb_crypt_4_grand_rounds;
+
+#define CAMELLIA_BLOCK_MASK     (~(CAMELLIA_BLOCK_SIZE - 1))
+
+static int __ecb_crypt(struct blkcipher_desc *desc,
+                       struct scatterlist *dst, struct scatterlist *src,
+                       unsigned int nbytes, bool encrypt)
+{
+        struct camellia_sparc64_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
+        struct blkcipher_walk walk;
+        ecb_crypt_op *op;
+        const u64 *key;
+        int err;
+
+        op = camellia_sparc64_ecb_crypt_3_grand_rounds;
+        if (ctx->key_len != 16)
+                op = camellia_sparc64_ecb_crypt_4_grand_rounds;
+
+        blkcipher_walk_init(&walk, dst, src, nbytes);
+        err = blkcipher_walk_virt(desc, &walk);
+
+        if (encrypt)
+                key = &ctx->encrypt_key[0];
+        else
+                key = &ctx->decrypt_key[0];
+        camellia_sparc64_load_keys(key, ctx->key_len);
+        while ((nbytes = walk.nbytes)) {
+                unsigned int block_len = nbytes & CAMELLIA_BLOCK_MASK;
+
+                if (likely(block_len)) {
+                        const u64 *src64;
+                        u64 *dst64;
+
+                        src64 = (const u64 *)walk.src.virt.addr;
+                        dst64 = (u64 *) walk.dst.virt.addr;
+                        op(src64, dst64, block_len, key);
+                }
+                nbytes &= CAMELLIA_BLOCK_SIZE - 1;
+                err = blkcipher_walk_done(desc, &walk, nbytes);
+        }
+        fprs_write(0);
+        return err;
+}
+
+static int ecb_encrypt(struct blkcipher_desc *desc,
+                       struct scatterlist *dst, struct scatterlist *src,
+                       unsigned int nbytes)
+{
+        return __ecb_crypt(desc, dst, src, nbytes, true);
+}
+
+static int ecb_decrypt(struct blkcipher_desc *desc,
+                       struct scatterlist *dst, struct scatterlist *src,
+                       unsigned int nbytes)
+{
+        return __ecb_crypt(desc, dst, src, nbytes, false);
+}
+
+typedef void cbc_crypt_op(const u64 *input, u64 *output, unsigned int len,
+                          const u64 *key, u64 *iv);
+
+extern cbc_crypt_op camellia_sparc64_cbc_encrypt_3_grand_rounds;
+extern cbc_crypt_op camellia_sparc64_cbc_encrypt_4_grand_rounds;
+extern cbc_crypt_op camellia_sparc64_cbc_decrypt_3_grand_rounds;
+extern cbc_crypt_op camellia_sparc64_cbc_decrypt_4_grand_rounds;
+
+static int cbc_encrypt(struct blkcipher_desc *desc,
+                       struct scatterlist *dst, struct scatterlist *src,
+                       unsigned int nbytes)
+{
+        struct camellia_sparc64_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
+        struct blkcipher_walk walk;
+        cbc_crypt_op *op;
+        const u64 *key;
+        int err;
+
+        op = camellia_sparc64_cbc_encrypt_3_grand_rounds;
+        if (ctx->key_len != 16)
+                op = camellia_sparc64_cbc_encrypt_4_grand_rounds;
+
+        blkcipher_walk_init(&walk, dst, src, nbytes);
+        err = blkcipher_walk_virt(desc, &walk);
+
+        key = &ctx->encrypt_key[0];
+        camellia_sparc64_load_keys(key, ctx->key_len);
+        while ((nbytes = walk.nbytes)) {
+                unsigned int block_len = nbytes & CAMELLIA_BLOCK_MASK;
+
+                if (likely(block_len)) {
+                        const u64 *src64;
+                        u64 *dst64;
+
+                        src64 = (const u64 *)walk.src.virt.addr;
+                        dst64 = (u64 *) walk.dst.virt.addr;
+                        op(src64, dst64, block_len, key,
+                           (u64 *) walk.iv);
+                }
+                nbytes &= CAMELLIA_BLOCK_SIZE - 1;
+                err = blkcipher_walk_done(desc, &walk, nbytes);
+        }
+        fprs_write(0);
+        return err;
+}
+
+static int cbc_decrypt(struct blkcipher_desc *desc,
+                       struct scatterlist *dst, struct scatterlist *src,
+                       unsigned int nbytes)
+{
+        struct camellia_sparc64_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
+        struct blkcipher_walk walk;
+        cbc_crypt_op *op;
+        const u64 *key;
+        int err;
+
+        op = camellia_sparc64_cbc_decrypt_3_grand_rounds;
+        if (ctx->key_len != 16)
+                op = camellia_sparc64_cbc_decrypt_4_grand_rounds;
+
+        blkcipher_walk_init(&walk, dst, src, nbytes);
+        err = blkcipher_walk_virt(desc, &walk);
+
+        key = &ctx->decrypt_key[0];
+        camellia_sparc64_load_keys(key, ctx->key_len);
+        while ((nbytes = walk.nbytes)) {
+                unsigned int block_len = nbytes & CAMELLIA_BLOCK_MASK;
+
+                if (likely(block_len)) {
+                        const u64 *src64;
+                        u64 *dst64;
+
+                        src64 = (const u64 *)walk.src.virt.addr;
+                        dst64 = (u64 *) walk.dst.virt.addr;
+                        op(src64, dst64, block_len, key,
+                           (u64 *) walk.iv);
+                }
+                nbytes &= CAMELLIA_BLOCK_SIZE - 1;
+                err = blkcipher_walk_done(desc, &walk, nbytes);
+        }
+        fprs_write(0);
+        return err;
+}
+
+static struct crypto_alg algs[] = { {
+        .cra_name               = "camellia",
+        .cra_driver_name        = "camellia-sparc64",
+        .cra_priority           = 150,
+        .cra_flags              = CRYPTO_ALG_TYPE_CIPHER,
+        .cra_blocksize          = CAMELLIA_BLOCK_SIZE,
+        .cra_ctxsize            = sizeof(struct camellia_sparc64_ctx),
+        .cra_alignmask          = 3,
+        .cra_module             = THIS_MODULE,
+        .cra_u  = {
+                .cipher = {
+                        .cia_min_keysize        = CAMELLIA_MIN_KEY_SIZE,
+                        .cia_max_keysize        = CAMELLIA_MAX_KEY_SIZE,
+                        .cia_setkey             = camellia_set_key,
+                        .cia_encrypt            = camellia_encrypt,
+                        .cia_decrypt            = camellia_decrypt
+                }
+        }
+}, {
+        .cra_name               = "ecb(camellia)",
+        .cra_driver_name        = "ecb-camellia-sparc64",
+        .cra_priority           = 150,
+        .cra_flags              = CRYPTO_ALG_TYPE_BLKCIPHER,
+        .cra_blocksize          = CAMELLIA_BLOCK_SIZE,
+        .cra_ctxsize            = sizeof(struct camellia_sparc64_ctx),
+        .cra_alignmask          = 7,
+        .cra_type               = &crypto_blkcipher_type,
+        .cra_module             = THIS_MODULE,
+        .cra_u = {
+                .blkcipher = {
+                        .min_keysize    = CAMELLIA_MIN_KEY_SIZE,
+                        .max_keysize    = CAMELLIA_MAX_KEY_SIZE,
+                        .setkey         = camellia_set_key,
+                        .encrypt        = ecb_encrypt,
+                        .decrypt        = ecb_decrypt,
+                },
+        },
+}, {
+        .cra_name               = "cbc(camellia)",
+        .cra_driver_name        = "cbc-camellia-sparc64",
+        .cra_priority           = 150,
+        .cra_flags              = CRYPTO_ALG_TYPE_BLKCIPHER,
+        .cra_blocksize          = CAMELLIA_BLOCK_SIZE,
+        .cra_ctxsize            = sizeof(struct camellia_sparc64_ctx),
+        .cra_alignmask          = 7,
+        .cra_type               = &crypto_blkcipher_type,
+        .cra_module             = THIS_MODULE,
+        .cra_u = {
+                .blkcipher = {
+                        .min_keysize    = CAMELLIA_MIN_KEY_SIZE,
+                        .max_keysize    = CAMELLIA_MAX_KEY_SIZE,
+                        .setkey         = camellia_set_key,
+                        .encrypt        = cbc_encrypt,
+                        .decrypt        = cbc_decrypt,
+                },
+        },
+}
+};
+
+static bool __init sparc64_has_camellia_opcode(void)
+{
+        unsigned long cfr;
+
+        if (!(sparc64_elf_hwcap & HWCAP_SPARC_CRYPTO))
+                return false;
+
+        __asm__ __volatile__("rd %%asr26, %0" : "=r" (cfr));
+        if (!(cfr & CFR_CAMELLIA))
+                return false;
+
+        return true;
+}
+
+static int __init camellia_sparc64_mod_init(void)
+{
+        int i;
+
+        for (i = 0; i < ARRAY_SIZE(algs); i++)
+                INIT_LIST_HEAD(&algs[i].cra_list);
+
+        if (sparc64_has_camellia_opcode()) {
+                pr_info("Using sparc64 camellia opcodes optimized CAMELLIA implementation\n");
+                return crypto_register_algs(algs, ARRAY_SIZE(algs));
+        }
+        pr_info("sparc64 camellia opcodes not available.\n");
+        return -ENODEV;
+}
+
+static void __exit camellia_sparc64_mod_fini(void)
+{
+        crypto_unregister_algs(algs, ARRAY_SIZE(algs));
+}
+
+module_init(camellia_sparc64_mod_init);
+module_exit(camellia_sparc64_mod_fini);
+
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("Camellia Cipher Algorithm, sparc64 camellia opcode accelerated");
+
+MODULE_ALIAS("aes");