From fcca797d2adb83be198db8530f1fd4f6c60e81fe Mon Sep 17 00:00:00 2001 From: Pascal van Leeuwen Date: Fri, 13 Sep 2019 11:10:36 +0200 Subject: [PATCH] crypto: inside-secure - Add support for the ecb(sm4) skcipher This patch adds support for SM4 in ECB mode, i.e. skcipher ecb(sm4). changes since v1: - make SAFEXCEL_SM4 case entry explit, using the proper SM4_BLOCK_SIZE instead of "borrowing" the AES code which "coincidentally" works Signed-off-by: Pascal van Leeuwen Signed-off-by: Herbert Xu --- drivers/crypto/inside-secure/safexcel.c | 1 + drivers/crypto/inside-secure/safexcel.h | 2 + drivers/crypto/inside-secure/safexcel_cipher.c | 94 ++++++++++++++++++++++++++ 3 files changed, 97 insertions(+) diff --git a/drivers/crypto/inside-secure/safexcel.c b/drivers/crypto/inside-secure/safexcel.c index 87d431a..0ac3b45 100644 --- a/drivers/crypto/inside-secure/safexcel.c +++ b/drivers/crypto/inside-secure/safexcel.c @@ -1178,6 +1178,7 @@ static struct safexcel_alg_template *safexcel_algs[] = { &safexcel_alg_chachapoly_esp, &safexcel_alg_sm3, &safexcel_alg_hmac_sm3, + &safexcel_alg_ecb_sm4, }; static int safexcel_register_algorithms(struct safexcel_crypto_priv *priv) diff --git a/drivers/crypto/inside-secure/safexcel.h b/drivers/crypto/inside-secure/safexcel.h index 1b2d709..3a91cc2 100644 --- a/drivers/crypto/inside-secure/safexcel.h +++ b/drivers/crypto/inside-secure/safexcel.h @@ -359,6 +359,7 @@ struct safexcel_context_record { #define CONTEXT_CONTROL_CRYPTO_ALG_AES192 (0x6 << 17) #define CONTEXT_CONTROL_CRYPTO_ALG_AES256 (0x7 << 17) #define CONTEXT_CONTROL_CRYPTO_ALG_CHACHA20 (0x8 << 17) +#define CONTEXT_CONTROL_CRYPTO_ALG_SM4 (0xd << 17) #define CONTEXT_CONTROL_DIGEST_PRECOMPUTED (0x1 << 21) #define CONTEXT_CONTROL_DIGEST_XCM (0x2 << 21) #define CONTEXT_CONTROL_DIGEST_HMAC (0x3 << 21) @@ -878,5 +879,6 @@ extern struct safexcel_alg_template safexcel_alg_chachapoly; extern struct safexcel_alg_template safexcel_alg_chachapoly_esp; extern struct safexcel_alg_template safexcel_alg_sm3; extern struct safexcel_alg_template safexcel_alg_hmac_sm3; +extern struct safexcel_alg_template safexcel_alg_ecb_sm4; #endif diff --git a/drivers/crypto/inside-secure/safexcel_cipher.c b/drivers/crypto/inside-secure/safexcel_cipher.c index f1e6cae..4d74924 100644 --- a/drivers/crypto/inside-secure/safexcel_cipher.c +++ b/drivers/crypto/inside-secure/safexcel_cipher.c @@ -19,6 +19,7 @@ #include #include #include +#include #include #include #include @@ -36,6 +37,7 @@ enum safexcel_cipher_alg { SAFEXCEL_3DES, SAFEXCEL_AES, SAFEXCEL_CHACHA20, + SAFEXCEL_SM4, }; struct safexcel_cipher_ctx { @@ -139,6 +141,10 @@ static void safexcel_cipher_token(struct safexcel_cipher_ctx *ctx, u8 *iv, block_sz = DES3_EDE_BLOCK_SIZE; cdesc->control_data.options |= EIP197_OPTION_2_TOKEN_IV_CMD; break; + case SAFEXCEL_SM4: + block_sz = SM4_BLOCK_SIZE; + cdesc->control_data.options |= EIP197_OPTION_4_TOKEN_IV_CMD; + break; case SAFEXCEL_AES: block_sz = AES_BLOCK_SIZE; cdesc->control_data.options |= EIP197_OPTION_4_TOKEN_IV_CMD; @@ -526,6 +532,9 @@ static int safexcel_context_control(struct safexcel_cipher_ctx *ctx, } else if (ctx->alg == SAFEXCEL_CHACHA20) { cdesc->control_data.control0 |= CONTEXT_CONTROL_CRYPTO_ALG_CHACHA20; + } else if (ctx->alg == SAFEXCEL_SM4) { + cdesc->control_data.control0 |= + CONTEXT_CONTROL_CRYPTO_ALG_SM4; } return 0; @@ -2613,3 +2622,88 @@ struct safexcel_alg_template safexcel_alg_chachapoly_esp = { }, }, }; + +static int safexcel_skcipher_sm4_setkey(struct crypto_skcipher *ctfm, + const u8 *key, unsigned int len) +{ + struct crypto_tfm *tfm = crypto_skcipher_tfm(ctfm); + struct safexcel_cipher_ctx *ctx = crypto_tfm_ctx(tfm); + struct safexcel_crypto_priv *priv = ctx->priv; + int i; + + if (len != SM4_KEY_SIZE) { + crypto_skcipher_set_flags(ctfm, CRYPTO_TFM_RES_BAD_KEY_LEN); + return -EINVAL; + } + + if (priv->flags & EIP197_TRC_CACHE && ctx->base.ctxr_dma) { + for (i = 0; i < SM4_KEY_SIZE / sizeof(u32); i++) { + if (ctx->key[i] != + get_unaligned_le32(key + i * sizeof(u32))) { + ctx->base.needs_inv = true; + break; + } + } + } + + for (i = 0; i < SM4_KEY_SIZE / sizeof(u32); i++) + ctx->key[i] = get_unaligned_le32(key + i * sizeof(u32)); + ctx->key_len = SM4_KEY_SIZE; + + return 0; +} + +static int safexcel_sm4_blk_encrypt(struct skcipher_request *req) +{ + /* Workaround for HW bug: EIP96 4.3 does not report blocksize error */ + if (req->cryptlen & (SM4_BLOCK_SIZE - 1)) + return -EINVAL; + else + return safexcel_queue_req(&req->base, skcipher_request_ctx(req), + SAFEXCEL_ENCRYPT); +} + +static int safexcel_sm4_blk_decrypt(struct skcipher_request *req) +{ + /* Workaround for HW bug: EIP96 4.3 does not report blocksize error */ + if (req->cryptlen & (SM4_BLOCK_SIZE - 1)) + return -EINVAL; + else + return safexcel_queue_req(&req->base, skcipher_request_ctx(req), + SAFEXCEL_DECRYPT); +} + +static int safexcel_skcipher_sm4_ecb_cra_init(struct crypto_tfm *tfm) +{ + struct safexcel_cipher_ctx *ctx = crypto_tfm_ctx(tfm); + + safexcel_skcipher_cra_init(tfm); + ctx->alg = SAFEXCEL_SM4; + ctx->mode = CONTEXT_CONTROL_CRYPTO_MODE_ECB; + return 0; +} + +struct safexcel_alg_template safexcel_alg_ecb_sm4 = { + .type = SAFEXCEL_ALG_TYPE_SKCIPHER, + .algo_mask = SAFEXCEL_ALG_SM4, + .alg.skcipher = { + .setkey = safexcel_skcipher_sm4_setkey, + .encrypt = safexcel_sm4_blk_encrypt, + .decrypt = safexcel_sm4_blk_decrypt, + .min_keysize = SM4_KEY_SIZE, + .max_keysize = SM4_KEY_SIZE, + .base = { + .cra_name = "ecb(sm4)", + .cra_driver_name = "safexcel-ecb-sm4", + .cra_priority = SAFEXCEL_CRA_PRIORITY, + .cra_flags = CRYPTO_ALG_ASYNC | + CRYPTO_ALG_KERN_DRIVER_ONLY, + .cra_blocksize = SM4_BLOCK_SIZE, + .cra_ctxsize = sizeof(struct safexcel_cipher_ctx), + .cra_alignmask = 0, + .cra_init = safexcel_skcipher_sm4_ecb_cra_init, + .cra_exit = safexcel_skcipher_cra_exit, + .cra_module = THIS_MODULE, + }, + }, +}; -- 2.7.4