46 lines
1011 B
C
46 lines
1011 B
C
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// Copyright (c) 2008 The OpenSSL Project. All rights reserved.
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// SPDX-License-Identifier: Apache-2.0
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#include <openssl/type_check.h>
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#include <assert.h>
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#include <string.h>
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#include "internal.h"
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OPENSSL_STATIC_ASSERT(16 % sizeof(size_t) == 0,
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ofb_block_cannot_be_divided_into_size_t)
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void CRYPTO_ofb128_encrypt(const uint8_t *in, uint8_t *out, size_t len,
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const AES_KEY *key, uint8_t ivec[16], unsigned *num,
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block128_f block) {
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assert(key != NULL && ivec != NULL && num != NULL);
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assert(len == 0 || (in != NULL && out != NULL));
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unsigned n = *num;
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while (n && len) {
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*(out++) = *(in++) ^ ivec[n];
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--len;
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n = (n + 1) % 16;
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}
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while (len >= 16) {
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(*block)(ivec, ivec, key);
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CRYPTO_xor16(out, in, ivec);
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len -= 16;
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out += 16;
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in += 16;
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n = 0;
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}
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if (len) {
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(*block)(ivec, ivec, key);
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while (len--) {
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out[n] = in[n] ^ ivec[n];
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++n;
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}
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}
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*num = n;
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}
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