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/*
* Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
*
* Licensed under the Apache License, Version 2.0 (the "License").
* You may not use this file except in compliance with the License.
* A copy of the License is located at
*
* http://aws.amazon.com/apache2.0
*
* or in the "license" file accompanying this file. This file is distributed
* on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either
* express or implied. See the License for the specific language governing
* permissions and limitations under the License.
*/
#include <string.h>
#include "api/s2n.h"
#include "s2n_test.h"
#include "stuffer/s2n_stuffer.h"
#include "utils/s2n_random.h"
/* Generated with this python:
*
* b64 = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=";
*
* for i in range(0, 256):
* if chr(i) in b64:
* print str(b64.index(chr(i))) + ", ",
* else:
* print "255, ",
*
* if (i + 1) % 16 == 0:
* print
*
* Note that '=' maps to 64.
*/
static const uint8_t b64_inverse[256] = { 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 62, 255, 255, 255, 63, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 255, 255, 255, 64, 255, 255,
255, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 255, 255, 255,
255, 255, 255, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50,
51, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255 };
bool s2n_is_base64_char_alternate(unsigned char c)
{
return (b64_inverse[*((uint8_t *) (&c))] != 255);
}
int main(int argc, char **argv)
{
BEGIN_TEST();
/* s2n_is_base64_char */
for (uint8_t i = 0; i < 255; i++) {
EXPECT_EQUAL(s2n_is_base64_char(i), s2n_is_base64_char_alternate(i));
};
/* safety: s2n_stuffer_read/write_base64 */
{
struct s2n_stuffer a = { 0 };
struct s2n_stuffer b = { 0 };
EXPECT_SUCCESS(s2n_stuffer_write_base64(&a, &b));
EXPECT_SUCCESS(s2n_stuffer_read_base64(&a, &b));
}
/* known-value base64 read/write tests using byte strings of `0` */
struct {
uint8_t bytes;
const char *expected;
} test_cases[] = {
{
.bytes = 1,
.expected = "AA==",
},
{
.bytes = 2,
.expected = "AAA=",
},
{
.bytes = 3,
.expected = "AAAA",
},
{
.bytes = 4,
.expected = "AAAAAA==",
},
};
for (int i = 0; i < s2n_array_len(test_cases); i++) {
DEFER_CLEANUP(struct s2n_stuffer binary = { 0 }, s2n_stuffer_free);
DEFER_CLEANUP(struct s2n_stuffer base64 = { 0 }, s2n_stuffer_free);
DEFER_CLEANUP(struct s2n_stuffer mirror = { 0 }, s2n_stuffer_free);
uint32_t base64_groups = test_cases[i].bytes / 3;
if (test_cases[i].bytes % 3 != 0) {
base64_groups++;
}
EXPECT_SUCCESS(s2n_stuffer_alloc(&binary, test_cases[i].bytes));
/* +1 for null terminator */
EXPECT_SUCCESS(s2n_stuffer_alloc(&base64, base64_groups * 4 + 1));
EXPECT_SUCCESS(s2n_stuffer_alloc(&mirror, base64_groups * 3));
for (int b = 0; b < test_cases[i].bytes; b++) {
EXPECT_SUCCESS(s2n_stuffer_write_uint8(&binary, 0));
}
EXPECT_SUCCESS(s2n_stuffer_write_base64(&base64, &binary));
EXPECT_EQUAL(s2n_stuffer_data_available(&base64), strlen(test_cases[i].expected));
EXPECT_BYTEARRAY_EQUAL(base64.blob.data, test_cases[i].expected, strlen(test_cases[i].expected));
EXPECT_SUCCESS(s2n_stuffer_read_base64(&base64, &mirror));
EXPECT_EQUAL(s2n_stuffer_data_available(&mirror), test_cases[i].bytes);
EXPECT_BYTEARRAY_EQUAL(binary.blob.data, mirror.blob.data, test_cases[i].bytes);
};
char hello_world[] = "Hello world!";
uint8_t hello_world_base64[] = "SGVsbG8gd29ybGQhAA==";
struct s2n_stuffer stuffer = { 0 }, known_data = { 0 }, scratch = { 0 }, entropy = { 0 }, mirror = { 0 };
uint8_t pad[50];
struct s2n_blob r = { 0 };
EXPECT_SUCCESS(s2n_blob_init(&r, pad, sizeof(pad)));
/* Create a 100 byte stuffer */
EXPECT_SUCCESS(s2n_stuffer_alloc(&stuffer, 1000));
/* Write our known data */
EXPECT_SUCCESS(s2n_stuffer_alloc_ro_from_string(&known_data, hello_world));
EXPECT_SUCCESS(s2n_stuffer_write_base64(&stuffer, &known_data));
EXPECT_SUCCESS(s2n_stuffer_free(&known_data));
/* Check it against the known output */
EXPECT_EQUAL(memcmp(stuffer.blob.data, hello_world_base64, strlen((char *) hello_world)), 0);
/* Check that we can read it again */
EXPECT_SUCCESS(s2n_stuffer_alloc(&scratch, 50));
EXPECT_SUCCESS(s2n_stuffer_read_base64(&stuffer, &scratch));
EXPECT_SUCCESS(memcmp(scratch.blob.data, hello_world, strlen(hello_world)));
/* Now try with some randomly generated data. Make sure we try each boundary case,
* where size % 3 == 0, 1, 2
*/
EXPECT_SUCCESS(s2n_stuffer_alloc(&entropy, 50));
/* +1 to give space for the null terminator written by EVP_EncodeBlock */
EXPECT_SUCCESS(s2n_stuffer_alloc(&mirror, 50 + 1));
for (size_t i = entropy.blob.size; i > 0; i--) {
EXPECT_SUCCESS(s2n_stuffer_wipe(&stuffer));
EXPECT_SUCCESS(s2n_stuffer_wipe(&entropy));
EXPECT_SUCCESS(s2n_stuffer_wipe(&mirror));
/* Get i bytes of random data */
r.size = i;
EXPECT_OK(s2n_get_public_random_data(&r));
EXPECT_SUCCESS(s2n_stuffer_write_bytes(&entropy, pad, i));
/* Write i bytes it, base64 encoded */
/* Read it back, decoded */
EXPECT_SUCCESS(s2n_stuffer_write_base64(&stuffer, &entropy));
/* s2n_is_base64_char: should be true for all bytes in the stuffer */
while (s2n_stuffer_data_available(&stuffer) > 0) {
uint8_t byte = 0;
EXPECT_SUCCESS(s2n_stuffer_read_uint8(&stuffer, &byte));
EXPECT_TRUE(s2n_is_base64_char(byte));
}
EXPECT_SUCCESS(s2n_stuffer_reread(&stuffer));
/* Should be (i / 3) * 4 + a carry */
EXPECT_EQUAL((i / 3) * 4 + ((i % 3) ? 4 : 0), s2n_stuffer_data_available(&stuffer));
/* Read it back, decoded */
EXPECT_SUCCESS(s2n_stuffer_read_base64(&stuffer, &mirror));
/* Verify it's the same */
EXPECT_EQUAL(memcmp(mirror.blob.data, entropy.blob.data, i), 0);
}
EXPECT_SUCCESS(s2n_stuffer_free(&stuffer));
EXPECT_SUCCESS(s2n_stuffer_free(&scratch));
EXPECT_SUCCESS(s2n_stuffer_free(&mirror));
EXPECT_SUCCESS(s2n_stuffer_free(&entropy));
END_TEST();
}
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