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crypto: inside-secure - Minor code cleanup and optimizations 

Some minor cleanup changing e.g. "if (!x) A else B" to "if (x) B else A",
merging some back-to-back if's with the same condition, collapsing some
back-to-back assignments to the same variable and replacing some weird
assignments with proper symbolics.

Signed-off-by: Pascal van Leeuwen <pvanleeuwen@verimatrix.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Pascal van Leeuwen 2019-08-30 09:43:01 +02:00 committed by Herbert Xu
parent 493e289ca8
commit d2d9e6fd6d
1 changed files with 49 additions and 41 deletions
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90
drivers/crypto/inside-secure/safexcel_cipher.c
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@ -126,9 +126,6 @@ static void safexcel_aead_token(struct safexcel_cipher_ctx *ctx, u8 *iv,
safexcel_cipher_token(ctx, iv, cdesc);
if (direction == SAFEXCEL_DECRYPT)
cryptlen -= digestsize;
if (direction == SAFEXCEL_ENCRYPT) {
/* align end of instruction sequence to end of token */
token = (struct safexcel_token *)(cdesc->control_data.token +
@ -141,6 +138,8 @@ static void safexcel_aead_token(struct safexcel_cipher_ctx *ctx, u8 *iv,
token[2].instructions = EIP197_TOKEN_INS_TYPE_OUTPUT |
EIP197_TOKEN_INS_INSERT_HASH_DIGEST;
} else {
cryptlen -= digestsize;
/* align end of instruction sequence to end of token */
token = (struct safexcel_token *)(cdesc->control_data.token +
EIP197_MAX_TOKENS - 4);
@ -159,13 +158,7 @@ static void safexcel_aead_token(struct safexcel_cipher_ctx *ctx, u8 *iv,
token[3].instructions = EIP197_TOKEN_INS_TYPE_OUTPUT;
}
if (unlikely(!cryptlen)) {
token[1].opcode = EIP197_TOKEN_OPCODE_DIRECTION;
token[1].packet_length = assoclen;
token[1].stat = EIP197_TOKEN_STAT_LAST_HASH;
token[1].instructions = EIP197_TOKEN_INS_LAST |
EIP197_TOKEN_INS_TYPE_HASH;
} else {
if (likely(cryptlen)) {
if (likely(assoclen)) {
token[0].opcode = EIP197_TOKEN_OPCODE_DIRECTION;
token[0].packet_length = assoclen;
@ -179,6 +172,12 @@ static void safexcel_aead_token(struct safexcel_cipher_ctx *ctx, u8 *iv,
EIP197_TOKEN_INS_TYPE_CRYPTO |
EIP197_TOKEN_INS_TYPE_HASH |
EIP197_TOKEN_INS_TYPE_OUTPUT;
} else {
token[1].opcode = EIP197_TOKEN_OPCODE_DIRECTION;
token[1].packet_length = assoclen;
token[1].stat = EIP197_TOKEN_STAT_LAST_HASH;
token[1].instructions = EIP197_TOKEN_INS_LAST |
EIP197_TOKEN_INS_TYPE_HASH;
}
}
@ -325,45 +324,60 @@ static int safexcel_context_control(struct safexcel_cipher_ctx *ctx,
struct safexcel_command_desc *cdesc)
{
struct safexcel_crypto_priv *priv = ctx->priv;
int ctrl_size;
int ctrl_size = ctx->key_len / sizeof(u32);
cdesc->control_data.control1 = ctx->mode;
if (ctx->aead) {
if (sreq->direction == SAFEXCEL_ENCRYPT)
cdesc->control_data.control0 |= CONTEXT_CONTROL_TYPE_ENCRYPT_HASH_OUT;
else
cdesc->control_data.control0 |= CONTEXT_CONTROL_TYPE_HASH_DECRYPT_IN;
} else {
cdesc->control_data.control0 |= CONTEXT_CONTROL_TYPE_CRYPTO_OUT;
/* Take in account the ipad+opad digests */
ctrl_size += ctx->state_sz / sizeof(u32) * 2;
/* The decryption control type is a combination of the
* encryption type and CONTEXT_CONTROL_TYPE_NULL_IN, for all
* types.
*/
if (sreq->direction == SAFEXCEL_DECRYPT)
cdesc->control_data.control0 |= CONTEXT_CONTROL_TYPE_NULL_IN;
if (sreq->direction == SAFEXCEL_ENCRYPT)
cdesc->control_data.control0 =
CONTEXT_CONTROL_TYPE_ENCRYPT_HASH_OUT |
CONTEXT_CONTROL_DIGEST_HMAC |
CONTEXT_CONTROL_KEY_EN |
ctx->hash_alg |
CONTEXT_CONTROL_SIZE(ctrl_size);
else
cdesc->control_data.control0 =
CONTEXT_CONTROL_TYPE_HASH_DECRYPT_IN |
CONTEXT_CONTROL_DIGEST_HMAC |
CONTEXT_CONTROL_KEY_EN |
ctx->hash_alg |
CONTEXT_CONTROL_SIZE(ctrl_size);
} else {
if (sreq->direction == SAFEXCEL_ENCRYPT)
cdesc->control_data.control0 =
CONTEXT_CONTROL_TYPE_CRYPTO_OUT |
CONTEXT_CONTROL_KEY_EN |
CONTEXT_CONTROL_SIZE(ctrl_size);
else
cdesc->control_data.control0 =
CONTEXT_CONTROL_TYPE_CRYPTO_IN |
CONTEXT_CONTROL_KEY_EN |
CONTEXT_CONTROL_SIZE(ctrl_size);
}
cdesc->control_data.control0 |= CONTEXT_CONTROL_KEY_EN;
cdesc->control_data.control1 |= ctx->mode;
if (ctx->aead)
cdesc->control_data.control0 |= CONTEXT_CONTROL_DIGEST_HMAC |
ctx->hash_alg;
if (ctx->alg == SAFEXCEL_DES) {
cdesc->control_data.control0 |= CONTEXT_CONTROL_CRYPTO_ALG_DES;
cdesc->control_data.control0 |=
CONTEXT_CONTROL_CRYPTO_ALG_DES;
} else if (ctx->alg == SAFEXCEL_3DES) {
cdesc->control_data.control0 |= CONTEXT_CONTROL_CRYPTO_ALG_3DES;
cdesc->control_data.control0 |=
CONTEXT_CONTROL_CRYPTO_ALG_3DES;
} else if (ctx->alg == SAFEXCEL_AES) {
switch (ctx->key_len >> ctx->xts) {
case AES_KEYSIZE_128:
cdesc->control_data.control0 |= CONTEXT_CONTROL_CRYPTO_ALG_AES128;
cdesc->control_data.control0 |=
CONTEXT_CONTROL_CRYPTO_ALG_AES128;
break;
case AES_KEYSIZE_192:
cdesc->control_data.control0 |= CONTEXT_CONTROL_CRYPTO_ALG_AES192;
cdesc->control_data.control0 |=
CONTEXT_CONTROL_CRYPTO_ALG_AES192;
break;
case AES_KEYSIZE_256:
cdesc->control_data.control0 |= CONTEXT_CONTROL_CRYPTO_ALG_AES256;
cdesc->control_data.control0 |=
CONTEXT_CONTROL_CRYPTO_ALG_AES256;
break;
default:
dev_err(priv->dev, "aes keysize not supported: %u\n",
@ -372,12 +386,6 @@ static int safexcel_context_control(struct safexcel_cipher_ctx *ctx,
}
}
ctrl_size = ctx->key_len / sizeof(u32);
if (ctx->aead)
/* Take in account the ipad+opad digests */
ctrl_size += ctx->state_sz / sizeof(u32) * 2;
cdesc->control_data.control0 |= CONTEXT_CONTROL_SIZE(ctrl_size);
return 0;
}