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SubjectRe: [PATCH v4 2/3] drivers: crypto: Add the Virtual Function driver for CPT
Date
Am Mittwoch, 11. Januar 2017, 10:56:50 CET schrieb George Cherian:

Hi George,

> +int cvm_enc_dec_setkey(struct crypto_ablkcipher *cipher, const u8 *key,
> + u32 keylen)
> +{
> + struct crypto_tfm *tfm = crypto_ablkcipher_tfm(cipher);
> + struct cvm_enc_ctx *ctx = crypto_tfm_ctx(tfm);
> +
> + if ((keylen == 16) || (keylen == 24) || (keylen == 32)) {
> + ctx->key_len = keylen;
> + memcpy(ctx->enc_key, key, keylen);
> + return 0;
> + }
> + crypto_ablkcipher_set_flags(cipher, CRYPTO_TFM_RES_BAD_KEY_LEN);
> +
> + return -EINVAL;
> +}

...
> +
> +struct crypto_alg algs[] = { {
> + .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC,
> + .cra_blocksize = AES_BLOCK_SIZE,
> + .cra_ctxsize = sizeof(struct cvm_enc_ctx),
> + .cra_alignmask = 7,
> + .cra_priority = 4001,
> + .cra_name = "xts(aes)",
> + .cra_driver_name = "cavium-xts-aes",
> + .cra_type = &crypto_ablkcipher_type,
> + .cra_u = {
> + .ablkcipher = {
> + .ivsize = AES_BLOCK_SIZE,
> + .min_keysize = AES_MIN_KEY_SIZE,
> + .max_keysize = AES_MAX_KEY_SIZE,
> + .setkey = cvm_enc_dec_setkey,

May I ask how the setkey for XTS is intended to work? The XTS keys are double
in size than "normal" keys.

> + .encrypt = cvm_aes_encrypt_xts,
> + .decrypt = cvm_aes_decrypt_xts,
> + },


Ciao
Stephan

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