59 lines
1.3 KiB
C
59 lines
1.3 KiB
C
#include "aes256.h"
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AES_EXPORT void ige256_encrypt(uint8_t* in, uint32_t length, uint8_t* key, uint8_t* iv, uint8_t* out) {
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uint32_t expandedKey[EXPANDED_KEY_SIZE];
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uint32_t i, j;
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uint8_t* iv1;
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uint8_t* iv2;
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uint8_t* block;
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iv1 = &iv[0];
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iv2 = &iv[16];
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aes256_set_encryption_key(key, expandedKey);
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for (i = 0; i < length; i += AES_BLOCK_SIZE) {
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block = &out[i];
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for (j = 0; j < AES_BLOCK_SIZE; ++j)
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block[j] = in[i + j] ^ iv1[j];
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aes256_encrypt(block, block, expandedKey);
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for (j = 0; j < AES_BLOCK_SIZE; ++j)
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block[j] ^= iv2[j];
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iv1 = block;
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iv2 = &in[i];
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}
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}
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AES_EXPORT void ige256_decrypt(uint8_t* in, uint32_t length, uint8_t* key, uint8_t* iv, uint8_t* out) {
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uint32_t expandedKey[EXPANDED_KEY_SIZE];
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uint32_t i, j;
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uint8_t* iv1;
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uint8_t* iv2;
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uint8_t* block;
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iv1 = &iv[16];
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iv2 = &iv[0];
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aes256_set_decryption_key(key, expandedKey);
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for (i = 0; i < length; i += AES_BLOCK_SIZE) {
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block = &out[i];
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for (j = 0; j < AES_BLOCK_SIZE; ++j)
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block[j] = in[i + j] ^ iv1[j];
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aes256_decrypt(block, block, expandedKey);
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for (j = 0; j < AES_BLOCK_SIZE; ++j)
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block[j] ^= iv2[j];
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iv1 = block;
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iv2 = &in[i];
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}
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}
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