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authorDavid S. Miller <davem@davemloft.net>2012-08-25 22:37:23 -0700
committerDavid S. Miller <davem@davemloft.net>2012-08-25 22:37:23 -0700
commitc5aac2df6577636ef526d87ec6d92796a190b27f (patch)
tree8dbd4f06b3aa08f776d173938adacb98fd79dac5 /arch/sparc/crypto/des_glue.c
parent442a7c40b1dac78588abfe8ed4c97e4bb8b36e73 (diff)
downloadlinux-c5aac2df6577636ef526d87ec6d92796a190b27f.tar.gz
sparc64: Add DES driver making use of the new des opcodes.
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'arch/sparc/crypto/des_glue.c')
-rw-r--r--arch/sparc/crypto/des_glue.c525
1 files changed, 525 insertions, 0 deletions
diff --git a/arch/sparc/crypto/des_glue.c b/arch/sparc/crypto/des_glue.c
new file mode 100644
index 000000000000..5ec0309e48c0
--- /dev/null
+++ b/arch/sparc/crypto/des_glue.c
@@ -0,0 +1,525 @@
+/* Glue code for DES 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 <crypto/des.h>
+
+#include <asm/fpumacro.h>
+#include <asm/pstate.h>
+#include <asm/elf.h>
+
+struct des_sparc64_ctx {
+ u64 encrypt_expkey[DES_EXPKEY_WORDS / 2];
+ u64 decrypt_expkey[DES_EXPKEY_WORDS / 2];
+};
+
+struct des3_ede_sparc64_ctx {
+ u64 encrypt_expkey[DES3_EDE_EXPKEY_WORDS / 2];
+ u64 decrypt_expkey[DES3_EDE_EXPKEY_WORDS / 2];
+};
+
+static void encrypt_to_decrypt(u64 *d, const u64 *e)
+{
+ const u64 *s = e + (DES_EXPKEY_WORDS / 2) - 1;
+ int i;
+
+ for (i = 0; i < DES_EXPKEY_WORDS / 2; i++)
+ *d++ = *s--;
+}
+
+extern void des_sparc64_key_expand(const u32 *input_key, u64 *key);
+
+static int des_set_key(struct crypto_tfm *tfm, const u8 *key,
+ unsigned int keylen)
+{
+ struct des_sparc64_ctx *dctx = crypto_tfm_ctx(tfm);
+ u32 *flags = &tfm->crt_flags;
+ u32 tmp[DES_EXPKEY_WORDS];
+ int ret;
+
+ /* Even though we have special instructions for key expansion,
+ * we call des_ekey() so that we don't have to write our own
+ * weak key detection code.
+ */
+ ret = des_ekey(tmp, key);
+ if (unlikely(ret == 0) && (*flags & CRYPTO_TFM_REQ_WEAK_KEY)) {
+ *flags |= CRYPTO_TFM_RES_WEAK_KEY;
+ return -EINVAL;
+ }
+
+ des_sparc64_key_expand((const u32 *) key, &dctx->encrypt_expkey[0]);
+ encrypt_to_decrypt(&dctx->decrypt_expkey[0], &dctx->encrypt_expkey[0]);
+
+ return 0;
+}
+
+extern void des_sparc64_crypt(const u64 *key, const u64 *input,
+ u64 *output);
+
+static void des_encrypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src)
+{
+ struct des_sparc64_ctx *ctx = crypto_tfm_ctx(tfm);
+ const u64 *K = ctx->encrypt_expkey;
+
+ des_sparc64_crypt(K, (const u64 *) src, (u64 *) dst);
+}
+
+static void des_decrypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src)
+{
+ struct des_sparc64_ctx *ctx = crypto_tfm_ctx(tfm);
+ const u64 *K = ctx->decrypt_expkey;
+
+ des_sparc64_crypt(K, (const u64 *) src, (u64 *) dst);
+}
+
+extern void des_sparc64_load_keys(const u64 *key);
+
+extern void des_sparc64_ecb_crypt(const u64 *input, u64 *output,
+ unsigned int len);
+
+#define DES_BLOCK_MASK (~(DES_BLOCK_SIZE - 1))
+
+static int __ecb_crypt(struct blkcipher_desc *desc,
+ struct scatterlist *dst, struct scatterlist *src,
+ unsigned int nbytes, bool encrypt)
+{
+ struct des_sparc64_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
+ struct blkcipher_walk walk;
+ int err;
+
+ blkcipher_walk_init(&walk, dst, src, nbytes);
+ err = blkcipher_walk_virt(desc, &walk);
+
+ if (encrypt)
+ des_sparc64_load_keys(&ctx->encrypt_expkey[0]);
+ else
+ des_sparc64_load_keys(&ctx->decrypt_expkey[0]);
+ while ((nbytes = walk.nbytes)) {
+ unsigned int block_len = nbytes & DES_BLOCK_MASK;
+
+ if (likely(block_len)) {
+ des_sparc64_ecb_crypt((const u64 *)walk.src.virt.addr,
+ (u64 *) walk.dst.virt.addr,
+ block_len);
+ }
+ nbytes &= DES_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);
+}
+
+extern void des_sparc64_cbc_encrypt(const u64 *input, u64 *output,
+ unsigned int len, u64 *iv);
+
+static int cbc_encrypt(struct blkcipher_desc *desc,
+ struct scatterlist *dst, struct scatterlist *src,
+ unsigned int nbytes)
+{
+ struct des_sparc64_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
+ struct blkcipher_walk walk;
+ int err;
+
+ blkcipher_walk_init(&walk, dst, src, nbytes);
+ err = blkcipher_walk_virt(desc, &walk);
+
+ des_sparc64_load_keys(&ctx->encrypt_expkey[0]);
+ while ((nbytes = walk.nbytes)) {
+ unsigned int block_len = nbytes & DES_BLOCK_MASK;
+
+ if (likely(block_len)) {
+ des_sparc64_cbc_encrypt((const u64 *)walk.src.virt.addr,
+ (u64 *) walk.dst.virt.addr,
+ block_len, (u64 *) walk.iv);
+ }
+ nbytes &= DES_BLOCK_SIZE - 1;
+ err = blkcipher_walk_done(desc, &walk, nbytes);
+ }
+ fprs_write(0);
+ return err;
+}
+
+extern void des_sparc64_cbc_decrypt(const u64 *input, u64 *output,
+ unsigned int len, u64 *iv);
+
+static int cbc_decrypt(struct blkcipher_desc *desc,
+ struct scatterlist *dst, struct scatterlist *src,
+ unsigned int nbytes)
+{
+ struct des_sparc64_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
+ struct blkcipher_walk walk;
+ int err;
+
+ blkcipher_walk_init(&walk, dst, src, nbytes);
+ err = blkcipher_walk_virt(desc, &walk);
+
+ des_sparc64_load_keys(&ctx->decrypt_expkey[0]);
+ while ((nbytes = walk.nbytes)) {
+ unsigned int block_len = nbytes & DES_BLOCK_MASK;
+
+ if (likely(block_len)) {
+ des_sparc64_cbc_decrypt((const u64 *)walk.src.virt.addr,
+ (u64 *) walk.dst.virt.addr,
+ block_len, (u64 *) walk.iv);
+ }
+ nbytes &= DES_BLOCK_SIZE - 1;
+ err = blkcipher_walk_done(desc, &walk, nbytes);
+ }
+ fprs_write(0);
+ return err;
+}
+
+static int des3_ede_set_key(struct crypto_tfm *tfm, const u8 *key,
+ unsigned int keylen)
+{
+ struct des3_ede_sparc64_ctx *dctx = crypto_tfm_ctx(tfm);
+ const u32 *K = (const u32 *)key;
+ u32 *flags = &tfm->crt_flags;
+ u64 k1[DES_EXPKEY_WORDS / 2];
+ u64 k2[DES_EXPKEY_WORDS / 2];
+ u64 k3[DES_EXPKEY_WORDS / 2];
+
+ if (unlikely(!((K[0] ^ K[2]) | (K[1] ^ K[3])) ||
+ !((K[2] ^ K[4]) | (K[3] ^ K[5]))) &&
+ (*flags & CRYPTO_TFM_REQ_WEAK_KEY)) {
+ *flags |= CRYPTO_TFM_RES_WEAK_KEY;
+ return -EINVAL;
+ }
+
+ des_sparc64_key_expand((const u32 *)key, k1);
+ key += DES_KEY_SIZE;
+ des_sparc64_key_expand((const u32 *)key, k2);
+ key += DES_KEY_SIZE;
+ des_sparc64_key_expand((const u32 *)key, k3);
+
+ memcpy(&dctx->encrypt_expkey[0], &k1[0], sizeof(k1));
+ encrypt_to_decrypt(&dctx->encrypt_expkey[DES_EXPKEY_WORDS / 2], &k2[0]);
+ memcpy(&dctx->encrypt_expkey[(DES_EXPKEY_WORDS / 2) * 2],
+ &k3[0], sizeof(k3));
+
+ encrypt_to_decrypt(&dctx->decrypt_expkey[0], &k3[0]);
+ memcpy(&dctx->decrypt_expkey[DES_EXPKEY_WORDS / 2],
+ &k2[0], sizeof(k2));
+ encrypt_to_decrypt(&dctx->decrypt_expkey[(DES_EXPKEY_WORDS / 2) * 2],
+ &k1[0]);
+
+ return 0;
+}
+
+extern void des3_ede_sparc64_crypt(const u64 *key, const u64 *input,
+ u64 *output);
+
+static void des3_ede_encrypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src)
+{
+ struct des3_ede_sparc64_ctx *ctx = crypto_tfm_ctx(tfm);
+ const u64 *K = ctx->encrypt_expkey;
+
+ des3_ede_sparc64_crypt(K, (const u64 *) src, (u64 *) dst);
+}
+
+static void des3_ede_decrypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src)
+{
+ struct des3_ede_sparc64_ctx *ctx = crypto_tfm_ctx(tfm);
+ const u64 *K = ctx->decrypt_expkey;
+
+ des3_ede_sparc64_crypt(K, (const u64 *) src, (u64 *) dst);
+}
+
+extern void des3_ede_sparc64_load_keys(const u64 *key);
+
+extern void des3_ede_sparc64_ecb_crypt(const u64 *expkey, const u64 *input,
+ u64 *output, unsigned int len);
+
+static int __ecb3_crypt(struct blkcipher_desc *desc,
+ struct scatterlist *dst, struct scatterlist *src,
+ unsigned int nbytes, bool encrypt)
+{
+ struct des3_ede_sparc64_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
+ struct blkcipher_walk walk;
+ const u64 *K;
+ int err;
+
+ blkcipher_walk_init(&walk, dst, src, nbytes);
+ err = blkcipher_walk_virt(desc, &walk);
+
+ if (encrypt)
+ K = &ctx->encrypt_expkey[0];
+ else
+ K = &ctx->decrypt_expkey[0];
+ des3_ede_sparc64_load_keys(K);
+ while ((nbytes = walk.nbytes)) {
+ unsigned int block_len = nbytes & DES_BLOCK_MASK;
+
+ if (likely(block_len)) {
+ const u64 *src64 = (const u64 *)walk.src.virt.addr;
+ des3_ede_sparc64_ecb_crypt(K, src64,
+ (u64 *) walk.dst.virt.addr,
+ block_len);
+ }
+ nbytes &= DES_BLOCK_SIZE - 1;
+ err = blkcipher_walk_done(desc, &walk, nbytes);
+ }
+ fprs_write(0);
+ return err;
+}
+
+static int ecb3_encrypt(struct blkcipher_desc *desc,
+ struct scatterlist *dst, struct scatterlist *src,
+ unsigned int nbytes)
+{
+ return __ecb3_crypt(desc, dst, src, nbytes, true);
+}
+
+static int ecb3_decrypt(struct blkcipher_desc *desc,
+ struct scatterlist *dst, struct scatterlist *src,
+ unsigned int nbytes)
+{
+ return __ecb3_crypt(desc, dst, src, nbytes, false);
+}
+
+extern void des3_ede_sparc64_cbc_encrypt(const u64 *expkey, const u64 *input,
+ u64 *output, unsigned int len,
+ u64 *iv);
+
+static int cbc3_encrypt(struct blkcipher_desc *desc,
+ struct scatterlist *dst, struct scatterlist *src,
+ unsigned int nbytes)
+{
+ struct des3_ede_sparc64_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
+ struct blkcipher_walk walk;
+ const u64 *K;
+ int err;
+
+ blkcipher_walk_init(&walk, dst, src, nbytes);
+ err = blkcipher_walk_virt(desc, &walk);
+
+ K = &ctx->encrypt_expkey[0];
+ des3_ede_sparc64_load_keys(K);
+ while ((nbytes = walk.nbytes)) {
+ unsigned int block_len = nbytes & DES_BLOCK_MASK;
+
+ if (likely(block_len)) {
+ const u64 *src64 = (const u64 *)walk.src.virt.addr;
+ des3_ede_sparc64_cbc_encrypt(K, src64,
+ (u64 *) walk.dst.virt.addr,
+ block_len,
+ (u64 *) walk.iv);
+ }
+ nbytes &= DES_BLOCK_SIZE - 1;
+ err = blkcipher_walk_done(desc, &walk, nbytes);
+ }
+ fprs_write(0);
+ return err;
+}
+
+extern void des3_ede_sparc64_cbc_decrypt(const u64 *expkey, const u64 *input,
+ u64 *output, unsigned int len,
+ u64 *iv);
+
+static int cbc3_decrypt(struct blkcipher_desc *desc,
+ struct scatterlist *dst, struct scatterlist *src,
+ unsigned int nbytes)
+{
+ struct des3_ede_sparc64_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
+ struct blkcipher_walk walk;
+ const u64 *K;
+ int err;
+
+ blkcipher_walk_init(&walk, dst, src, nbytes);
+ err = blkcipher_walk_virt(desc, &walk);
+
+ K = &ctx->decrypt_expkey[0];
+ des3_ede_sparc64_load_keys(K);
+ while ((nbytes = walk.nbytes)) {
+ unsigned int block_len = nbytes & DES_BLOCK_MASK;
+
+ if (likely(block_len)) {
+ const u64 *src64 = (const u64 *)walk.src.virt.addr;
+ des3_ede_sparc64_cbc_decrypt(K, src64,
+ (u64 *) walk.dst.virt.addr,
+ block_len,
+ (u64 *) walk.iv);
+ }
+ nbytes &= DES_BLOCK_SIZE - 1;
+ err = blkcipher_walk_done(desc, &walk, nbytes);
+ }
+ fprs_write(0);
+ return err;
+}
+
+static struct crypto_alg algs[] = { {
+ .cra_name = "des",
+ .cra_driver_name = "des-sparc64",
+ .cra_priority = 150,
+ .cra_flags = CRYPTO_ALG_TYPE_CIPHER,
+ .cra_blocksize = DES_BLOCK_SIZE,
+ .cra_ctxsize = sizeof(struct des_sparc64_ctx),
+ .cra_alignmask = 7,
+ .cra_module = THIS_MODULE,
+ .cra_u = {
+ .cipher = {
+ .cia_min_keysize = DES_KEY_SIZE,
+ .cia_max_keysize = DES_KEY_SIZE,
+ .cia_setkey = des_set_key,
+ .cia_encrypt = des_encrypt,
+ .cia_decrypt = des_decrypt
+ }
+ }
+}, {
+ .cra_name = "ecb(des)",
+ .cra_driver_name = "ecb-des-sparc64",
+ .cra_priority = 150,
+ .cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER,
+ .cra_blocksize = DES_BLOCK_SIZE,
+ .cra_ctxsize = sizeof(struct des_sparc64_ctx),
+ .cra_alignmask = 7,
+ .cra_type = &crypto_blkcipher_type,
+ .cra_module = THIS_MODULE,
+ .cra_u = {
+ .blkcipher = {
+ .min_keysize = DES_KEY_SIZE,
+ .max_keysize = DES_KEY_SIZE,
+ .setkey = des_set_key,
+ .encrypt = ecb_encrypt,
+ .decrypt = ecb_decrypt,
+ },
+ },
+}, {
+ .cra_name = "cbc(des)",
+ .cra_driver_name = "cbc-des-sparc64",
+ .cra_priority = 150,
+ .cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER,
+ .cra_blocksize = DES_BLOCK_SIZE,
+ .cra_ctxsize = sizeof(struct des_sparc64_ctx),
+ .cra_alignmask = 7,
+ .cra_type = &crypto_blkcipher_type,
+ .cra_module = THIS_MODULE,
+ .cra_u = {
+ .blkcipher = {
+ .min_keysize = DES_KEY_SIZE,
+ .max_keysize = DES_KEY_SIZE,
+ .setkey = des_set_key,
+ .encrypt = cbc_encrypt,
+ .decrypt = cbc_decrypt,
+ },
+ },
+}, {
+ .cra_name = "des3_ede",
+ .cra_driver_name = "des3_ede-sparc64",
+ .cra_priority = 150,
+ .cra_flags = CRYPTO_ALG_TYPE_CIPHER,
+ .cra_blocksize = DES3_EDE_BLOCK_SIZE,
+ .cra_ctxsize = sizeof(struct des3_ede_sparc64_ctx),
+ .cra_alignmask = 7,
+ .cra_module = THIS_MODULE,
+ .cra_u = {
+ .cipher = {
+ .cia_min_keysize = DES3_EDE_KEY_SIZE,
+ .cia_max_keysize = DES3_EDE_KEY_SIZE,
+ .cia_setkey = des3_ede_set_key,
+ .cia_encrypt = des3_ede_encrypt,
+ .cia_decrypt = des3_ede_decrypt
+ }
+ }
+}, {
+ .cra_name = "ecb(des3_ede)",
+ .cra_driver_name = "ecb-des3_ede-sparc64",
+ .cra_priority = 150,
+ .cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER,
+ .cra_blocksize = DES3_EDE_BLOCK_SIZE,
+ .cra_ctxsize = sizeof(struct des3_ede_sparc64_ctx),
+ .cra_alignmask = 7,
+ .cra_type = &crypto_blkcipher_type,
+ .cra_module = THIS_MODULE,
+ .cra_u = {
+ .blkcipher = {
+ .min_keysize = DES3_EDE_KEY_SIZE,
+ .max_keysize = DES3_EDE_KEY_SIZE,
+ .setkey = des3_ede_set_key,
+ .encrypt = ecb3_encrypt,
+ .decrypt = ecb3_decrypt,
+ },
+ },
+}, {
+ .cra_name = "cbc(des3_ede)",
+ .cra_driver_name = "cbc-des3_ede-sparc64",
+ .cra_priority = 150,
+ .cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER,
+ .cra_blocksize = DES3_EDE_BLOCK_SIZE,
+ .cra_ctxsize = sizeof(struct des3_ede_sparc64_ctx),
+ .cra_alignmask = 7,
+ .cra_type = &crypto_blkcipher_type,
+ .cra_module = THIS_MODULE,
+ .cra_u = {
+ .blkcipher = {
+ .min_keysize = DES3_EDE_KEY_SIZE,
+ .max_keysize = DES3_EDE_KEY_SIZE,
+ .setkey = des3_ede_set_key,
+ .encrypt = cbc3_encrypt,
+ .decrypt = cbc3_decrypt,
+ },
+ },
+} };
+
+static bool __init sparc64_has_des_opcode(void)
+{
+ unsigned long cfr;
+
+ if (!(sparc64_elf_hwcap & HWCAP_SPARC_CRYPTO))
+ return false;
+
+ __asm__ __volatile__("rd %%asr26, %0" : "=r" (cfr));
+ if (!(cfr & CFR_DES))
+ return false;
+
+ return true;
+}
+
+static int __init des_sparc64_mod_init(void)
+{
+ int i;
+
+ for (i = 0; i < ARRAY_SIZE(algs); i++)
+ INIT_LIST_HEAD(&algs[i].cra_list);
+
+ if (sparc64_has_des_opcode()) {
+ pr_info("Using sparc64 des opcodes optimized DES implementation\n");
+ return crypto_register_algs(algs, ARRAY_SIZE(algs));
+ }
+ pr_info("sparc64 des opcodes not available.\n");
+ return -ENODEV;
+}
+
+static void __exit des_sparc64_mod_fini(void)
+{
+ crypto_unregister_algs(algs, ARRAY_SIZE(algs));
+}
+
+module_init(des_sparc64_mod_init);
+module_exit(des_sparc64_mod_fini);
+
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("DES & Triple DES EDE Cipher Algorithms, sparc64 des opcode accelerated");
+
+MODULE_ALIAS("des");