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Re: [PATCH v4 2/3] drivers: crypto: Add the Virtual Function driver for CPT

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  Re: [PATCH v4 2/3] drivers: crypto: Add the Virtual Function driver for CPT Stephan Müller <smueller@chronox.de> - 2017-01-11 12:20 +0100
    Re: [PATCH v4 2/3] drivers: crypto: Add the Virtual Function driver for CPT Stephan Müller <smueller@chronox.de> - 2017-01-11 13:40 +0100
      Re: [PATCH v4 2/3] drivers: crypto: Add the Virtual Function driver for CPT Stephan Müller <smueller@chronox.de> - 2017-01-12 12:30 +0100

#1556405 — Re: [PATCH v4 2/3] drivers: crypto: Add the Virtual Function driver for CPT

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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#1556449

Am Mittwoch, 11. Januar 2017, 16:58:17 CET schrieb George Cherian:

Hi George,

> I will add a seperate function for xts setkey and make changes as following.
> > ...
> > 
> >> +
> >> +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.
> 
> 		.ablkcipher = {
> 			.ivsize = AES_BLOCK_SIZE,
> 			.min_keysize = 2 * AES_MIN_KEY_SIZE,
> 			.max_keysize = 2 * AES_MAX_KEY_SIZE,
> 			.setkey = cvm_xts_setkey,
> 
> Hope this is fine?
> 
Sure, please do not forget to invoke xts_verify_key.

Ciao
Stephan

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#1557381

Am Donnerstag, 12. Januar 2017, 16:40:32 CET schrieb George Cherian:

Hi George,

> > 
> > Sure, please do not forget to invoke xts_verify_key.
> 
> Should I be using xts_check_key or xts_verify_key?

Both are identical except for the input parameter -- the one requires 
crypto_skcipher, the other crypto_tfm. Depending what pointer you have handy 
in your setkey function, you would use the most appropriate one.

Ciao
Stephan

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