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+/*
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+ * Copyright 2018 The OpenSSL Project Authors. All Rights Reserved.
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+ *
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+ * Licensed under the OpenSSL license (the "License"). You may not use
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+ * this file except in compliance with the License. You can obtain a copy
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+ * in the file LICENSE in the source distribution or at
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+ * https://www.openssl.org/source/license.html
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+ */
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+
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+#include <string.h>
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+#include <stdlib.h>
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+#include <openssl/crypto.h>
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+#include <openssl/cmac.h>
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+#include "modes_lcl.h"
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+
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+#ifndef OPENSSL_NO_SIV
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+
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+__owur static ossl_inline uint32_t rotl8(uint32_t x)
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+{
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+ return (x << 8) | (x >> 24);
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+}
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+
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+__owur static ossl_inline uint32_t rotr8(uint32_t x)
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+{
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+ return (x >> 8) | (x << 24);
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+}
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+
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+__owur static ossl_inline uint64_t byteswap8(uint64_t x)
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+{
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+ uint32_t high = (uint32_t)(x >> 32);
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+ uint32_t low = (uint32_t)x;
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+
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+ high = (rotl8(high) & 0x00ff00ff) | (rotr8(high) & 0xff00ff00);
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+ low = (rotl8(low) & 0x00ff00ff) | (rotr8(low) & 0xff00ff00);
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+ return ((uint64_t)low) << 32 | (uint64_t)high;
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+}
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+
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+__owur static ossl_inline uint64_t siv128_getword(SIV_BLOCK const *b, size_t i)
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+{
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+ const union {
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+ long one;
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+ char little;
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+ } is_endian = { 1 };
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+
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+ if (is_endian.little)
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+ return byteswap8(b->word[i]);
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+ return b->word[i];
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+}
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+
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+static ossl_inline void siv128_putword(SIV_BLOCK *b, size_t i, uint64_t x)
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+{
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+ const union {
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+ long one;
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+ char little;
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+ } is_endian = { 1 };
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+
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+ if (is_endian.little)
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+ b->word[i] = byteswap8(x);
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+ else
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+ b->word[i] = x;
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+}
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+
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+static ossl_inline void siv128_xorblock(SIV_BLOCK *x,
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+ SIV_BLOCK const *y)
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+{
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+ x->word[0] ^= y->word[0];
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+ x->word[1] ^= y->word[1];
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+}
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+
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+/*
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+ * Doubles |b|, which is 16 bytes representing an element
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+ * of GF(2**128) modulo the irreducible polynomial
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+ * x**128 + x**7 + x**2 + x + 1.
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+ * Assumes two's-complement arithmetic
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+ */
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+static ossl_inline void siv128_dbl(SIV_BLOCK *b)
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+{
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+ uint64_t high = siv128_getword(b, 0);
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+ uint64_t low = siv128_getword(b, 1);
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+ uint64_t high_carry = high & (((uint64_t)1) << 63);
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+ uint64_t low_carry = low & (((uint64_t)1) << 63);
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+ int64_t low_mask = -((int64_t)(high_carry >> 63)) & 0x87;
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+ uint64_t high_mask = low_carry >> 63;
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+
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+ high = (high << 1) | high_mask;
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+ low = (low << 1) ^ (uint64_t)low_mask;
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+ siv128_putword(b, 0, high);
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+ siv128_putword(b, 1, low);
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+}
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+
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+__owur static ossl_inline int siv128_do_s2v_p(SIV128_CONTEXT *ctx, SIV_BLOCK *out,
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+ unsigned char const* in, size_t len)
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+{
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+ SIV_BLOCK t;
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+ size_t out_len = sizeof(out->byte);
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+
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+ if (!CMAC_CTX_copy(ctx->cmac_ctx, ctx->cmac_ctx_init))
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+ return 0;
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+
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+ if (len >= SIV_LEN) {
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+ if (!CMAC_Update(ctx->cmac_ctx, in, len - SIV_LEN))
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+ return 0;
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+ memcpy(&t, in + (len-SIV_LEN), SIV_LEN);
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+ siv128_xorblock(&t, &ctx->d);
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+ if (!CMAC_Update(ctx->cmac_ctx, t.byte, SIV_LEN))
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+ return 0;
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+ } else {
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+ memset(&t, 0, sizeof(t));
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+ memcpy(&t, in, len);
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+ t.byte[len] = 0x80;
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+ siv128_dbl(&ctx->d);
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+ siv128_xorblock(&t, &ctx->d);
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+ if (!CMAC_Update(ctx->cmac_ctx, t.byte, SIV_LEN))
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+ return 0;
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+ }
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+ if (!CMAC_Final(ctx->cmac_ctx, out->byte, &out_len)
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+ || out_len != SIV_LEN)
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+ return 0;
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+ return 1;
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+}
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+
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+
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+__owur static ossl_inline int siv128_do_encrypt(EVP_CIPHER_CTX *ctx, unsigned char *out,
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+ unsigned char const *in, size_t len,
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+ SIV_BLOCK *icv)
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+{
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+ int out_len = (int)len;
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+
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+ if (!EVP_CipherInit_ex(ctx, NULL, NULL, NULL, icv->byte, 1))
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+ return 0;
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+ return EVP_EncryptUpdate(ctx, out, &out_len, in, out_len);
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+}
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+
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+/*
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+ * Create a new SIV128_CONTEXT
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+ */
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+SIV128_CONTEXT *CRYPTO_siv128_new(const unsigned char *key, int klen, EVP_CIPHER* cbc, EVP_CIPHER* ctr)
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+{
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+ SIV128_CONTEXT *ctx;
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+ int ret;
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+
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+ if ((ctx = OPENSSL_malloc(sizeof(*ctx))) != NULL) {
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+ ret = CRYPTO_siv128_init(ctx, key, klen, cbc, ctr);
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+ if (ret)
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+ return ctx;
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+ OPENSSL_free(ctx);
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+ }
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+
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+ return NULL;
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+}
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+
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+/*
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+ * Initialise an existing SIV128_CONTEXT
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+ */
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+int CRYPTO_siv128_init(SIV128_CONTEXT *ctx, const unsigned char *key, int klen,
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+ const EVP_CIPHER* cbc, const EVP_CIPHER* ctr)
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+{
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+ static const unsigned char zero[SIV_LEN] = { 0 };
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+ size_t out_len = SIV_LEN;
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+
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+ memset(&ctx->d, 0, sizeof(ctx->d));
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+ ctx->cipher_ctx = NULL;
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+ ctx->cmac_ctx = NULL;
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+ ctx->cmac_ctx_init = NULL;
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+
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+ if (key == NULL || cbc == NULL || ctr == NULL
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+ || (ctx->cipher_ctx = EVP_CIPHER_CTX_new()) == NULL
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+ || (ctx->cmac_ctx_init = CMAC_CTX_new()) == NULL
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+ || (ctx->cmac_ctx = CMAC_CTX_new()) == NULL
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+ || !CMAC_Init(ctx->cmac_ctx_init, key, klen, cbc, NULL)
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+ || !EVP_EncryptInit_ex(ctx->cipher_ctx, ctr, NULL, key + klen, NULL)
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+ || !CMAC_CTX_copy(ctx->cmac_ctx, ctx->cmac_ctx_init)
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+ || !CMAC_Update(ctx->cmac_ctx, zero, sizeof(zero))
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+ || !CMAC_Final(ctx->cmac_ctx, ctx->d.byte, &out_len)) {
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+ EVP_CIPHER_CTX_free(ctx->cipher_ctx);
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+ CMAC_CTX_free(ctx->cmac_ctx_init);
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+ CMAC_CTX_free(ctx->cmac_ctx);
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+ return 0;
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+ }
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+
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+ ctx->final_ret = -1;
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+ ctx->crypto_ok = 1;
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+
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+ return 1;
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+}
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+
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+/*
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+ * Copy an SIV128_CONTEXT object
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+ */
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+int CRYPTO_siv128_copy_ctx(SIV128_CONTEXT *dest, SIV128_CONTEXT *src)
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+{
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+ memcpy(&dest->d, &src->d, sizeof(src->d));
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+ if (!EVP_CIPHER_CTX_copy(dest->cipher_ctx, src->cipher_ctx))
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+ return 0;
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+ if (!CMAC_CTX_copy(dest->cmac_ctx_init, src->cmac_ctx_init))
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+ return 0;
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+ /* no need to copy cmac_ctx since it's temp storage */
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+ return 1;
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+}
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+
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+/*
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+ * Provide any AAD. This can be called multiple times.
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+ * Per RFC5297, the last piece of associated data
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+ * is the nonce, but it's not treated special
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+ */
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+int CRYPTO_siv128_aad(SIV128_CONTEXT *ctx, const unsigned char *aad,
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+ size_t len)
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+{
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+ SIV_BLOCK cmac_out;
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+ size_t out_len = SIV_LEN;
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+
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+ siv128_dbl(&ctx->d);
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+
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+ if (!CMAC_CTX_copy(ctx->cmac_ctx, ctx->cmac_ctx_init)
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+ || !CMAC_Update(ctx->cmac_ctx, aad, len)
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+ || !CMAC_Final(ctx->cmac_ctx, cmac_out.byte, &out_len)
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+ || out_len != SIV_LEN)
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+ return 0;
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+
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+ siv128_xorblock(&ctx->d, &cmac_out);
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+
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+ return 1;
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+
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+}
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+
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+/*
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+ * Provide any data to be encrypted. This can be called once.
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+ */
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+int CRYPTO_siv128_encrypt(SIV128_CONTEXT *ctx,
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+ const unsigned char *in, unsigned char *out,
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+ size_t len)
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+{
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+ SIV_BLOCK q;
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+
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+ /* can only do one crypto operation */
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+ if (ctx->crypto_ok == 0)
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+ return 0;
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+ ctx->crypto_ok--;
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+
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+ if (!siv128_do_s2v_p(ctx, &q, in, len))
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+ return 0;
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+
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+ memcpy(ctx->tag.byte, &q, SIV_LEN);
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+ q.byte[8] &= 0x7f;
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+ q.byte[12] &= 0x7f;
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+
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+ if (!siv128_do_encrypt(ctx->cipher_ctx, out, in, len, &q))
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+ return 0;
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+ ctx->final_ret = 0;
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+ return len;
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+}
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+
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+/*
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+ * Provide any data to be decrypted. This can be called once.
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+ */
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+int CRYPTO_siv128_decrypt(SIV128_CONTEXT *ctx,
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+ const unsigned char *in, unsigned char *out,
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+ size_t len)
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+{
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+ unsigned char* p;
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+ SIV_BLOCK t, q;
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+ int i;
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+
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+ /* can only do one crypto operation */
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+ if (ctx->crypto_ok == 0)
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+ return 0;
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+ ctx->crypto_ok--;
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+
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+ memcpy(&q, ctx->tag.byte, SIV_LEN);
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+ q.byte[8] &= 0x7f;
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+ q.byte[12] &= 0x7f;
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+
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+ if (!siv128_do_encrypt(ctx->cipher_ctx, out, in, len, &q)
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+ || !siv128_do_s2v_p(ctx, &t, out, len))
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+ return 0;
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+
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+ p = ctx->tag.byte;
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+ for (i = 0; i < SIV_LEN; i++)
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+ t.byte[i] ^= p[i];
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+
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+ if ((t.word[0] | t.word[1]) != 0) {
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+ OPENSSL_cleanse(out, len);
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+ return 0;
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+ }
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+ ctx->final_ret = 0;
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+ return len;
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+}
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+
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+/*
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+ * Return the already calculated final result.
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+ */
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+int CRYPTO_siv128_finish(SIV128_CONTEXT *ctx)
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+{
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+ return ctx->final_ret;
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+}
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+
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+/*
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+ * Set the tag
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+ */
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+int CRYPTO_siv128_set_tag(SIV128_CONTEXT *ctx, const unsigned char *tag, size_t len)
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+{
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+ if (len != SIV_LEN)
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+ return 0;
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+
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+ /* Copy the tag from the supplied buffer */
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+ memcpy(ctx->tag.byte, tag, len);
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+ return 1;
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+}
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+
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+/*
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+ * Retrieve the calculated tag
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+ */
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+int CRYPTO_siv128_get_tag(SIV128_CONTEXT *ctx, unsigned char *tag, size_t len)
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+{
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+ if (len != SIV_LEN)
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+ return 0;
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+
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+ /* Copy the tag into the supplied buffer */
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+ memcpy(tag, ctx->tag.byte, len);
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+ return 1;
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+}
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+
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+/*
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+ * Release all resources
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+ */
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+int CRYPTO_siv128_cleanup(SIV128_CONTEXT *ctx)
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+{
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+ if (ctx != NULL) {
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+ EVP_CIPHER_CTX_free(ctx->cipher_ctx);
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+ ctx->cipher_ctx = NULL;
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+ CMAC_CTX_free(ctx->cmac_ctx_init);
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+ ctx->cmac_ctx_init = NULL;
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+ CMAC_CTX_free(ctx->cmac_ctx);
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+ ctx->cmac_ctx = NULL;
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+ OPENSSL_cleanse(&ctx->d, sizeof(ctx->d));
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+ OPENSSL_cleanse(&ctx->tag, sizeof(ctx->tag));
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+ ctx->final_ret = -1;
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+ ctx->crypto_ok = 1;
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+ }
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+ return 1;
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+}
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+
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+int CRYPTO_siv128_speed(SIV128_CONTEXT *ctx, int arg)
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+{
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+ ctx->crypto_ok = (arg == 1) ? -1 : 1;
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+ return 1;
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+}
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+
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+#endif /* OPENSSL_NO_SIV */
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