93 lines
2 KiB
C++
93 lines
2 KiB
C++
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#include <node_api.h>
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#include <openssl/evp.h>
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#include <openssl/err.h>
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#include "ige256.h"
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#define THROW_OPENSSL_ERROR \
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napi_throw_error(env, NULL, ERR_error_string(ERR_get_error(), NULL)); \
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return;
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void ige256_encrypt(napi_env env, uint8_t* in, uint32_t length, uint8_t* key, uint8_t* iv, uint8_t* out) {
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EVP_CIPHER_CTX *ctx;
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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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int written;
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iv1 = &iv[0];
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iv2 = &iv[16];
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if (!(ctx = EVP_CIPHER_CTX_new())) {
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THROW_OPENSSL_ERROR
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}
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if (1 != EVP_EncryptInit_ex(ctx, EVP_aes_256_ecb(), NULL, key, NULL)) {
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THROW_OPENSSL_ERROR
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}
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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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if (1 != EVP_EncryptUpdate(ctx, block, &written, block, AES_BLOCK_SIZE)) {
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THROW_OPENSSL_ERROR
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}
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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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EVP_CIPHER_CTX_free(ctx);
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}
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void ige256_decrypt(napi_env env, uint8_t* in, uint32_t length, uint8_t* key, uint8_t* iv, uint8_t* out) {
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EVP_CIPHER_CTX *ctx;
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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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int written;
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iv1 = &iv[16];
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iv2 = &iv[0];
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if (!(ctx = EVP_CIPHER_CTX_new())) {
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THROW_OPENSSL_ERROR
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}
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if (1 != EVP_DecryptInit_ex(ctx, EVP_aes_256_ecb(), NULL, key, NULL)) {
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THROW_OPENSSL_ERROR
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}
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if (1 != EVP_CIPHER_CTX_set_padding(ctx, 0)) {
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THROW_OPENSSL_ERROR
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}
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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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if (1 != EVP_DecryptUpdate(ctx, block, &written, block, AES_BLOCK_SIZE)) {
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THROW_OPENSSL_ERROR
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}
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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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