ofb128.c

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/*

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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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#include <openssl/crypto.h>

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#include "modes_lcl.h"

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#include <string.h>

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/*

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* The input and output encrypted as though 128bit ofb mode is being used.

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* The extra state information to record how much of the 128bit block we have

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* used is contained in *num;

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*/

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void CRYPTO_ofb128_encrypt(const unsigned char *in, unsigned char *out,

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size_t len, const void *key,

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unsigned char ivec[16], int *num, block128_f block)

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{

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unsigned int n;

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size_t l = 0;

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n = *num;

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#if !defined(OPENSSL_SMALL_FOOTPRINT)

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if (16 % sizeof(size_t) == 0) { /* always true actually */

16 % sizeof(size_t) == 0	Description
TRUE	evaluated 20114 times by 1 test Evaluated by: libcrypto.so.1.1
FALSE	never evaluated

0-20114

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do {

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while (n && len) {

n	Description
TRUE	evaluated 69406 times by 1 test Evaluated by: libcrypto.so.1.1
FALSE	evaluated 19816 times by 1 test Evaluated by: libcrypto.so.1.1

len	Description
TRUE	evaluated 69108 times by 1 test Evaluated by: libcrypto.so.1.1
FALSE	evaluated 298 times by 1 test Evaluated by: libcrypto.so.1.1

298-69406

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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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}

executed 69108 times by 1 test: end of block

Executed by:

libcrypto.so.1.1

69108

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# if defined(STRICT_ALIGNMENT)

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if (((size_t)in | (size_t)out | (size_t)ivec) % sizeof(size_t) !=

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0)

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break;

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# endif

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while (len >= 16) {

len >= 16	Description
TRUE	evaluated 391304 times by 1 test Evaluated by: libcrypto.so.1.1
FALSE	evaluated 20114 times by 1 test Evaluated by: libcrypto.so.1.1

20114-391304

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(*block) (ivec, ivec, key);

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for (; n < 16; n += sizeof(size_t))

n < 16	Description
TRUE	evaluated 782608 times by 1 test Evaluated by: libcrypto.so.1.1
FALSE	evaluated 391304 times by 1 test Evaluated by: libcrypto.so.1.1

391304-782608

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*(size_t *)(out + n) =

executed 782608 times by 1 test: *(size_t *)(out + n) = *(size_t *)(in + n) ^ *(size_t *)(ivec + n);

Executed by:

libcrypto.so.1.1

782608

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*(size_t *)(in + n) ^ *(size_t *)(ivec + n);

executed 782608 times by 1 test: *(size_t *)(out + n) = *(size_t *)(in + n) ^ *(size_t *)(ivec + n);

Executed by:

libcrypto.so.1.1

782608

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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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}

executed 391304 times by 1 test: end of block

Executed by:

libcrypto.so.1.1

391304

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if (len) {

len	Description
TRUE	evaluated 8406 times by 1 test Evaluated by: libcrypto.so.1.1
FALSE	evaluated 11708 times by 1 test Evaluated by: libcrypto.so.1.1

8406-11708

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(*block) (ivec, ivec, key);

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while (len--) {

len--	Description
TRUE	evaluated 65192 times by 1 test Evaluated by: libcrypto.so.1.1
FALSE	evaluated 8406 times by 1 test Evaluated by: libcrypto.so.1.1

8406-65192

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out[n] = in[n] ^ ivec[n];

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++n;

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}

executed 65192 times by 1 test: end of block

Executed by:

libcrypto.so.1.1

65192

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}

executed 8406 times by 1 test: end of block

Executed by:

libcrypto.so.1.1

8406

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*num = n;

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return;

executed 20114 times by 1 test: return;

Executed by:

libcrypto.so.1.1

20114

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} while (0);

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}

never executed: end of block

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/* the rest would be commonly eliminated by x86* compiler */

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#endif

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while (l < len) {

l < len	Description
TRUE	never evaluated
FALSE	never evaluated

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if (n == 0) {

n == 0	Description
TRUE	never evaluated
FALSE	never evaluated

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(*block) (ivec, ivec, key);

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}

never executed: end of block

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out[l] = in[l] ^ ivec[n];

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++l;

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n = (n + 1) % 16;

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}

never executed: end of block

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*num = n;

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}

never executed: end of block

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