[331] | 1 | /*
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| 2 | * Copyright 2011-2016 The OpenSSL Project Authors. All Rights Reserved.
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| 3 | *
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| 4 | * Licensed under the OpenSSL license (the "License"). You may not use
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| 5 | * this file except in compliance with the License. You can obtain a copy
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| 6 | * in the file LICENSE in the source distribution or at
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| 7 | * https://www.openssl.org/source/license.html
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| 8 | */
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| 9 |
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| 10 | #include <openssl/crypto.h>
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| 11 | #include "modes_lcl.h"
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| 12 | #include <string.h>
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| 13 |
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| 14 | /*
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| 15 | * First you setup M and L parameters and pass the key schedule. This is
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| 16 | * called once per session setup...
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| 17 | */
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| 18 | void CRYPTO_ccm128_init(CCM128_CONTEXT *ctx,
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| 19 | unsigned int M, unsigned int L, void *key,
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| 20 | block128_f block)
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| 21 | {
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| 22 | memset(ctx->nonce.c, 0, sizeof(ctx->nonce.c));
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| 23 | ctx->nonce.c[0] = ((u8)(L - 1) & 7) | (u8)(((M - 2) / 2) & 7) << 3;
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| 24 | ctx->blocks = 0;
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| 25 | ctx->block = block;
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| 26 | ctx->key = key;
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| 27 | }
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| 28 |
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| 29 | /* !!! Following interfaces are to be called *once* per packet !!! */
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| 30 |
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| 31 | /* Then you setup per-message nonce and pass the length of the message */
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| 32 | int CRYPTO_ccm128_setiv(CCM128_CONTEXT *ctx,
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| 33 | const unsigned char *nonce, size_t nlen, size_t mlen)
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| 34 | {
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| 35 | unsigned int L = ctx->nonce.c[0] & 7; /* the L parameter */
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| 36 |
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| 37 | if (nlen < (14 - L))
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| 38 | return -1; /* nonce is too short */
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| 39 |
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| 40 | if (sizeof(mlen) == 8 && L >= 3) {
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| 41 | ctx->nonce.c[8] = (u8)(mlen >> (56 % (sizeof(mlen) * 8)));
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| 42 | ctx->nonce.c[9] = (u8)(mlen >> (48 % (sizeof(mlen) * 8)));
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| 43 | ctx->nonce.c[10] = (u8)(mlen >> (40 % (sizeof(mlen) * 8)));
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| 44 | ctx->nonce.c[11] = (u8)(mlen >> (32 % (sizeof(mlen) * 8)));
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| 45 | } else
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| 46 | ctx->nonce.u[1] = 0;
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| 47 |
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| 48 | ctx->nonce.c[12] = (u8)(mlen >> 24);
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| 49 | ctx->nonce.c[13] = (u8)(mlen >> 16);
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| 50 | ctx->nonce.c[14] = (u8)(mlen >> 8);
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| 51 | ctx->nonce.c[15] = (u8)mlen;
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| 52 |
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| 53 | ctx->nonce.c[0] &= ~0x40; /* clear Adata flag */
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| 54 | memcpy(&ctx->nonce.c[1], nonce, 14 - L);
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| 55 |
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| 56 | return 0;
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| 57 | }
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| 58 |
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| 59 | /* Then you pass additional authentication data, this is optional */
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| 60 | void CRYPTO_ccm128_aad(CCM128_CONTEXT *ctx,
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| 61 | const unsigned char *aad, size_t alen)
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| 62 | {
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| 63 | unsigned int i;
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| 64 | block128_f block = ctx->block;
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| 65 |
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| 66 | if (alen == 0)
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| 67 | return;
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| 68 |
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| 69 | ctx->nonce.c[0] |= 0x40; /* set Adata flag */
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| 70 | (*block) (ctx->nonce.c, ctx->cmac.c, ctx->key), ctx->blocks++;
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| 71 |
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| 72 | if (alen < (0x10000 - 0x100)) {
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| 73 | ctx->cmac.c[0] ^= (u8)(alen >> 8);
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| 74 | ctx->cmac.c[1] ^= (u8)alen;
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| 75 | i = 2;
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| 76 | } else if (sizeof(alen) == 8
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| 77 | && alen >= (size_t)1 << (32 % (sizeof(alen) * 8))) {
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| 78 | ctx->cmac.c[0] ^= 0xFF;
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| 79 | ctx->cmac.c[1] ^= 0xFF;
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| 80 | ctx->cmac.c[2] ^= (u8)(alen >> (56 % (sizeof(alen) * 8)));
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| 81 | ctx->cmac.c[3] ^= (u8)(alen >> (48 % (sizeof(alen) * 8)));
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| 82 | ctx->cmac.c[4] ^= (u8)(alen >> (40 % (sizeof(alen) * 8)));
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| 83 | ctx->cmac.c[5] ^= (u8)(alen >> (32 % (sizeof(alen) * 8)));
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| 84 | ctx->cmac.c[6] ^= (u8)(alen >> 24);
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| 85 | ctx->cmac.c[7] ^= (u8)(alen >> 16);
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| 86 | ctx->cmac.c[8] ^= (u8)(alen >> 8);
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| 87 | ctx->cmac.c[9] ^= (u8)alen;
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| 88 | i = 10;
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| 89 | } else {
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| 90 | ctx->cmac.c[0] ^= 0xFF;
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| 91 | ctx->cmac.c[1] ^= 0xFE;
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| 92 | ctx->cmac.c[2] ^= (u8)(alen >> 24);
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| 93 | ctx->cmac.c[3] ^= (u8)(alen >> 16);
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| 94 | ctx->cmac.c[4] ^= (u8)(alen >> 8);
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| 95 | ctx->cmac.c[5] ^= (u8)alen;
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| 96 | i = 6;
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| 97 | }
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| 98 |
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| 99 | do {
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| 100 | for (; i < 16 && alen; ++i, ++aad, --alen)
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| 101 | ctx->cmac.c[i] ^= *aad;
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| 102 | (*block) (ctx->cmac.c, ctx->cmac.c, ctx->key), ctx->blocks++;
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| 103 | i = 0;
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| 104 | } while (alen);
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| 105 | }
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| 106 |
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| 107 | /* Finally you encrypt or decrypt the message */
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| 108 |
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| 109 | /*
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| 110 | * counter part of nonce may not be larger than L*8 bits, L is not larger
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| 111 | * than 8, therefore 64-bit counter...
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| 112 | */
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| 113 | static void ctr64_inc(unsigned char *counter)
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| 114 | {
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| 115 | unsigned int n = 8;
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| 116 | u8 c;
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| 117 |
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| 118 | counter += 8;
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| 119 | do {
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| 120 | --n;
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| 121 | c = counter[n];
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| 122 | ++c;
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| 123 | counter[n] = c;
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| 124 | if (c)
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| 125 | return;
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| 126 | } while (n);
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| 127 | }
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| 128 |
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| 129 | int CRYPTO_ccm128_encrypt(CCM128_CONTEXT *ctx,
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| 130 | const unsigned char *inp, unsigned char *out,
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| 131 | size_t len)
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| 132 | {
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| 133 | size_t n;
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| 134 | unsigned int i, L;
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| 135 | unsigned char flags0 = ctx->nonce.c[0];
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| 136 | block128_f block = ctx->block;
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| 137 | void *key = ctx->key;
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| 138 | union {
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| 139 | u64 u[2];
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| 140 | u8 c[16];
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| 141 | } scratch;
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| 142 |
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| 143 | if (!(flags0 & 0x40))
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| 144 | (*block) (ctx->nonce.c, ctx->cmac.c, key), ctx->blocks++;
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| 145 |
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| 146 | ctx->nonce.c[0] = L = flags0 & 7;
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| 147 | for (n = 0, i = 15 - L; i < 15; ++i) {
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| 148 | n |= ctx->nonce.c[i];
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| 149 | ctx->nonce.c[i] = 0;
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| 150 | n <<= 8;
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| 151 | }
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| 152 | n |= ctx->nonce.c[15]; /* reconstructed length */
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| 153 | ctx->nonce.c[15] = 1;
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| 154 |
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| 155 | if (n != len)
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| 156 | return -1; /* length mismatch */
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| 157 |
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| 158 | ctx->blocks += ((len + 15) >> 3) | 1;
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| 159 | if (ctx->blocks > (U64(1) << 61))
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| 160 | return -2; /* too much data */
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| 161 |
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| 162 | while (len >= 16) {
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| 163 | #if defined(STRICT_ALIGNMENT)
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| 164 | union {
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| 165 | u64 u[2];
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| 166 | u8 c[16];
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| 167 | } temp;
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| 168 |
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| 169 | memcpy(temp.c, inp, 16);
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| 170 | ctx->cmac.u[0] ^= temp.u[0];
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| 171 | ctx->cmac.u[1] ^= temp.u[1];
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| 172 | #else
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| 173 | ctx->cmac.u[0] ^= ((u64 *)inp)[0];
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| 174 | ctx->cmac.u[1] ^= ((u64 *)inp)[1];
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| 175 | #endif
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| 176 | (*block) (ctx->cmac.c, ctx->cmac.c, key);
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| 177 | (*block) (ctx->nonce.c, scratch.c, key);
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| 178 | ctr64_inc(ctx->nonce.c);
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| 179 | #if defined(STRICT_ALIGNMENT)
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| 180 | temp.u[0] ^= scratch.u[0];
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| 181 | temp.u[1] ^= scratch.u[1];
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| 182 | memcpy(out, temp.c, 16);
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| 183 | #else
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| 184 | ((u64 *)out)[0] = scratch.u[0] ^ ((u64 *)inp)[0];
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| 185 | ((u64 *)out)[1] = scratch.u[1] ^ ((u64 *)inp)[1];
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| 186 | #endif
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| 187 | inp += 16;
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| 188 | out += 16;
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| 189 | len -= 16;
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| 190 | }
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| 191 |
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| 192 | if (len) {
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| 193 | for (i = 0; i < len; ++i)
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| 194 | ctx->cmac.c[i] ^= inp[i];
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| 195 | (*block) (ctx->cmac.c, ctx->cmac.c, key);
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| 196 | (*block) (ctx->nonce.c, scratch.c, key);
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| 197 | for (i = 0; i < len; ++i)
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| 198 | out[i] = scratch.c[i] ^ inp[i];
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| 199 | }
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| 200 |
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| 201 | for (i = 15 - L; i < 16; ++i)
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| 202 | ctx->nonce.c[i] = 0;
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| 203 |
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| 204 | (*block) (ctx->nonce.c, scratch.c, key);
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| 205 | ctx->cmac.u[0] ^= scratch.u[0];
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| 206 | ctx->cmac.u[1] ^= scratch.u[1];
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| 207 |
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| 208 | ctx->nonce.c[0] = flags0;
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| 209 |
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| 210 | return 0;
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| 211 | }
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| 212 |
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| 213 | int CRYPTO_ccm128_decrypt(CCM128_CONTEXT *ctx,
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| 214 | const unsigned char *inp, unsigned char *out,
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| 215 | size_t len)
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| 216 | {
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| 217 | size_t n;
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| 218 | unsigned int i, L;
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| 219 | unsigned char flags0 = ctx->nonce.c[0];
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| 220 | block128_f block = ctx->block;
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| 221 | void *key = ctx->key;
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| 222 | union {
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| 223 | u64 u[2];
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| 224 | u8 c[16];
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| 225 | } scratch;
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| 226 |
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| 227 | if (!(flags0 & 0x40))
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| 228 | (*block) (ctx->nonce.c, ctx->cmac.c, key);
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| 229 |
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| 230 | ctx->nonce.c[0] = L = flags0 & 7;
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| 231 | for (n = 0, i = 15 - L; i < 15; ++i) {
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| 232 | n |= ctx->nonce.c[i];
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| 233 | ctx->nonce.c[i] = 0;
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| 234 | n <<= 8;
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| 235 | }
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| 236 | n |= ctx->nonce.c[15]; /* reconstructed length */
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| 237 | ctx->nonce.c[15] = 1;
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| 238 |
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| 239 | if (n != len)
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| 240 | return -1;
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| 241 |
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| 242 | while (len >= 16) {
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| 243 | #if defined(STRICT_ALIGNMENT)
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| 244 | union {
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| 245 | u64 u[2];
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| 246 | u8 c[16];
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| 247 | } temp;
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| 248 | #endif
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| 249 | (*block) (ctx->nonce.c, scratch.c, key);
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| 250 | ctr64_inc(ctx->nonce.c);
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| 251 | #if defined(STRICT_ALIGNMENT)
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| 252 | memcpy(temp.c, inp, 16);
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| 253 | ctx->cmac.u[0] ^= (scratch.u[0] ^= temp.u[0]);
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| 254 | ctx->cmac.u[1] ^= (scratch.u[1] ^= temp.u[1]);
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| 255 | memcpy(out, scratch.c, 16);
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| 256 | #else
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| 257 | ctx->cmac.u[0] ^= (((u64 *)out)[0] = scratch.u[0] ^ ((u64 *)inp)[0]);
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| 258 | ctx->cmac.u[1] ^= (((u64 *)out)[1] = scratch.u[1] ^ ((u64 *)inp)[1]);
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| 259 | #endif
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| 260 | (*block) (ctx->cmac.c, ctx->cmac.c, key);
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| 261 |
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| 262 | inp += 16;
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| 263 | out += 16;
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| 264 | len -= 16;
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| 265 | }
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| 266 |
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| 267 | if (len) {
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| 268 | (*block) (ctx->nonce.c, scratch.c, key);
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| 269 | for (i = 0; i < len; ++i)
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| 270 | ctx->cmac.c[i] ^= (out[i] = scratch.c[i] ^ inp[i]);
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| 271 | (*block) (ctx->cmac.c, ctx->cmac.c, key);
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| 272 | }
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| 273 |
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| 274 | for (i = 15 - L; i < 16; ++i)
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| 275 | ctx->nonce.c[i] = 0;
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| 276 |
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| 277 | (*block) (ctx->nonce.c, scratch.c, key);
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| 278 | ctx->cmac.u[0] ^= scratch.u[0];
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| 279 | ctx->cmac.u[1] ^= scratch.u[1];
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| 280 |
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| 281 | ctx->nonce.c[0] = flags0;
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| 282 |
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| 283 | return 0;
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| 284 | }
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| 285 |
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| 286 | static void ctr64_add(unsigned char *counter, size_t inc)
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| 287 | {
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| 288 | size_t n = 8, val = 0;
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| 289 |
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| 290 | counter += 8;
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| 291 | do {
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| 292 | --n;
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| 293 | val += counter[n] + (inc & 0xff);
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| 294 | counter[n] = (unsigned char)val;
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| 295 | val >>= 8; /* carry bit */
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| 296 | inc >>= 8;
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| 297 | } while (n && (inc || val));
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| 298 | }
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| 299 |
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| 300 | int CRYPTO_ccm128_encrypt_ccm64(CCM128_CONTEXT *ctx,
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| 301 | const unsigned char *inp, unsigned char *out,
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| 302 | size_t len, ccm128_f stream)
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| 303 | {
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| 304 | size_t n;
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| 305 | unsigned int i, L;
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| 306 | unsigned char flags0 = ctx->nonce.c[0];
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| 307 | block128_f block = ctx->block;
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| 308 | void *key = ctx->key;
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| 309 | union {
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| 310 | u64 u[2];
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| 311 | u8 c[16];
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| 312 | } scratch;
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| 313 |
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| 314 | if (!(flags0 & 0x40))
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| 315 | (*block) (ctx->nonce.c, ctx->cmac.c, key), ctx->blocks++;
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| 316 |
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| 317 | ctx->nonce.c[0] = L = flags0 & 7;
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| 318 | for (n = 0, i = 15 - L; i < 15; ++i) {
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| 319 | n |= ctx->nonce.c[i];
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| 320 | ctx->nonce.c[i] = 0;
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| 321 | n <<= 8;
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| 322 | }
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| 323 | n |= ctx->nonce.c[15]; /* reconstructed length */
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| 324 | ctx->nonce.c[15] = 1;
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| 325 |
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| 326 | if (n != len)
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| 327 | return -1; /* length mismatch */
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| 328 |
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| 329 | ctx->blocks += ((len + 15) >> 3) | 1;
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| 330 | if (ctx->blocks > (U64(1) << 61))
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| 331 | return -2; /* too much data */
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| 332 |
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| 333 | if ((n = len / 16)) {
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| 334 | (*stream) (inp, out, n, key, ctx->nonce.c, ctx->cmac.c);
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| 335 | n *= 16;
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| 336 | inp += n;
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| 337 | out += n;
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| 338 | len -= n;
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| 339 | if (len)
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| 340 | ctr64_add(ctx->nonce.c, n / 16);
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| 341 | }
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| 342 |
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| 343 | if (len) {
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| 344 | for (i = 0; i < len; ++i)
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| 345 | ctx->cmac.c[i] ^= inp[i];
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| 346 | (*block) (ctx->cmac.c, ctx->cmac.c, key);
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| 347 | (*block) (ctx->nonce.c, scratch.c, key);
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| 348 | for (i = 0; i < len; ++i)
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| 349 | out[i] = scratch.c[i] ^ inp[i];
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| 350 | }
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| 351 |
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| 352 | for (i = 15 - L; i < 16; ++i)
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| 353 | ctx->nonce.c[i] = 0;
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| 354 |
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| 355 | (*block) (ctx->nonce.c, scratch.c, key);
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| 356 | ctx->cmac.u[0] ^= scratch.u[0];
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| 357 | ctx->cmac.u[1] ^= scratch.u[1];
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| 358 |
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| 359 | ctx->nonce.c[0] = flags0;
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| 360 |
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| 361 | return 0;
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| 362 | }
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| 363 |
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| 364 | int CRYPTO_ccm128_decrypt_ccm64(CCM128_CONTEXT *ctx,
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| 365 | const unsigned char *inp, unsigned char *out,
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| 366 | size_t len, ccm128_f stream)
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| 367 | {
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| 368 | size_t n;
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| 369 | unsigned int i, L;
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| 370 | unsigned char flags0 = ctx->nonce.c[0];
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| 371 | block128_f block = ctx->block;
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| 372 | void *key = ctx->key;
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| 373 | union {
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| 374 | u64 u[2];
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| 375 | u8 c[16];
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| 376 | } scratch;
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| 377 |
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| 378 | if (!(flags0 & 0x40))
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| 379 | (*block) (ctx->nonce.c, ctx->cmac.c, key);
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| 380 |
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| 381 | ctx->nonce.c[0] = L = flags0 & 7;
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| 382 | for (n = 0, i = 15 - L; i < 15; ++i) {
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| 383 | n |= ctx->nonce.c[i];
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| 384 | ctx->nonce.c[i] = 0;
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| 385 | n <<= 8;
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| 386 | }
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| 387 | n |= ctx->nonce.c[15]; /* reconstructed length */
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| 388 | ctx->nonce.c[15] = 1;
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| 389 |
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| 390 | if (n != len)
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| 391 | return -1;
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| 392 |
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| 393 | if ((n = len / 16)) {
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| 394 | (*stream) (inp, out, n, key, ctx->nonce.c, ctx->cmac.c);
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| 395 | n *= 16;
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| 396 | inp += n;
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| 397 | out += n;
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| 398 | len -= n;
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| 399 | if (len)
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| 400 | ctr64_add(ctx->nonce.c, n / 16);
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| 401 | }
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| 402 |
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| 403 | if (len) {
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| 404 | (*block) (ctx->nonce.c, scratch.c, key);
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| 405 | for (i = 0; i < len; ++i)
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| 406 | ctx->cmac.c[i] ^= (out[i] = scratch.c[i] ^ inp[i]);
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| 407 | (*block) (ctx->cmac.c, ctx->cmac.c, key);
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| 408 | }
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| 409 |
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| 410 | for (i = 15 - L; i < 16; ++i)
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| 411 | ctx->nonce.c[i] = 0;
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| 412 |
|
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| 413 | (*block) (ctx->nonce.c, scratch.c, key);
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| 414 | ctx->cmac.u[0] ^= scratch.u[0];
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| 415 | ctx->cmac.u[1] ^= scratch.u[1];
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| 416 |
|
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| 417 | ctx->nonce.c[0] = flags0;
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| 418 |
|
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| 419 | return 0;
|
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| 420 | }
|
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| 421 |
|
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| 422 | size_t CRYPTO_ccm128_tag(CCM128_CONTEXT *ctx, unsigned char *tag, size_t len)
|
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| 423 | {
|
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| 424 | unsigned int M = (ctx->nonce.c[0] >> 3) & 7; /* the M parameter */
|
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| 425 |
|
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| 426 | M *= 2;
|
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| 427 | M += 2;
|
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| 428 | if (len < M)
|
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| 429 | return 0;
|
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| 430 | memcpy(tag, ctx->cmac.c, M);
|
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| 431 | return M;
|
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| 432 | }
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