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crypto: inside-secure - Minor optimization recognizing CTR is always AES

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Moved counter mode handling code in front as it doesn't depend on the
rest of the code to be executed, it can just do its thing and exit.

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 09:42:29 +02:00 committed by Herbert Xu
parent aa88f331c8
commit 493e289ca8
1 changed files with 14 additions and 11 deletions
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25
drivers/crypto/inside-secure/safexcel_cipher.c
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@ -65,6 +65,19 @@ static void safexcel_cipher_token(struct safexcel_cipher_ctx *ctx, u8 *iv,
{
u32 block_sz = 0;
if (ctx->mode == CONTEXT_CONTROL_CRYPTO_MODE_CTR_LOAD) {
cdesc->control_data.options |= EIP197_OPTION_4_TOKEN_IV_CMD;
/* 32 bit nonce */
cdesc->control_data.token[0] = ctx->nonce;
/* 64 bit IV part */
memcpy(&cdesc->control_data.token[1], iv, 8);
/* 32 bit counter, start at 1 (big endian!) */
cdesc->control_data.token[3] = cpu_to_be32(1);
return;
}
if (ctx->mode != CONTEXT_CONTROL_CRYPTO_MODE_ECB) {
switch (ctx->alg) {
case SAFEXCEL_DES:
@ -80,17 +93,7 @@ static void safexcel_cipher_token(struct safexcel_cipher_ctx *ctx, u8 *iv,
cdesc->control_data.options |= EIP197_OPTION_4_TOKEN_IV_CMD;
break;
}
if (ctx->mode == CONTEXT_CONTROL_CRYPTO_MODE_CTR_LOAD) {
/* 32 bit nonce */
cdesc->control_data.token[0] = ctx->nonce;
/* 64 bit IV part */
memcpy(&cdesc->control_data.token[1], iv, 8);
/* 32 bit counter, start at 1 (big endian!) */
cdesc->control_data.token[3] = cpu_to_be32(1);
} else {
memcpy(cdesc->control_data.token, iv, block_sz);
}
memcpy(cdesc->control_data.token, iv, block_sz);
}
}