mirror of
https://github.com/phdlee/uvk5cec
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75 lines
1.9 KiB
C
75 lines
1.9 KiB
C
/* Copyright 2023 Dual Tachyon
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* https://github.com/DualTachyon
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include <stdbool.h>
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#include "bsp/dp32g030/aes.h"
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#include "driver/aes.h"
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static void AES_Setup_ENC_CBC(bool IsDecrypt, const void *pKey, const void *pIv)
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{
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const uint32_t *pK = (const uint32_t *)pKey;
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const uint32_t *pI = (const uint32_t *)pIv;
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(void)IsDecrypt; // unused
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AES_CR = (AES_CR & ~AES_CR_EN_MASK) | AES_CR_EN_BITS_DISABLE;
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AES_CR = AES_CR_CHMOD_BITS_CBC;
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AES_KEYR3 = pK[0];
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AES_KEYR2 = pK[1];
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AES_KEYR1 = pK[2];
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AES_KEYR0 = pK[3];
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AES_IVR3 = pI[0];
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AES_IVR2 = pI[1];
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AES_IVR1 = pI[2];
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AES_IVR0 = pI[3];
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AES_CR = (AES_CR & ~AES_CR_EN_MASK) | AES_CR_EN_BITS_ENABLE;
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}
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static void AES_Transform(const void *pIn, void *pOut)
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{
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const uint32_t *pI = (const uint32_t *)pIn;
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uint32_t *pO = (uint32_t *)pOut;
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AES_DINR = pI[0];
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AES_DINR = pI[1];
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AES_DINR = pI[2];
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AES_DINR = pI[3];
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while ((AES_SR & AES_SR_CCF_MASK) == AES_SR_CCF_BITS_NOT_COMPLETE) {
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}
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pO[0] = AES_DOUTR;
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pO[1] = AES_DOUTR;
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pO[2] = AES_DOUTR;
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pO[3] = AES_DOUTR;
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AES_CR |= AES_CR_CCFC_BITS_SET;
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}
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void AES_Encrypt(const void *pKey, const void *pIv, const void *pIn, void *pOut, uint8_t NumBlocks)
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{
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const uint8_t *pI = (const uint8_t *)pIn;
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uint8_t *pO = (uint8_t *)pOut;
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uint8_t i;
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AES_Setup_ENC_CBC(0, pKey, pIv);
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for (i = 0; i < NumBlocks; i++) {
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AES_Transform(pI + (i * 16), pO + (i * 16));
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}
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}
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