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Fix mbedtls dependency and decrypt using AES in ECB mode

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This commit is contained in:
Dimitri Lozeve 2020-06-05 17:34:29 +02:00
parent 91ca893d85
commit 02ca35a4ff
2 changed files with 16 additions and 2 deletions
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2
meson.build
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@ -7,7 +7,7 @@ incdir = include_directories('src')
cmake = import('cmake') cmake = import('cmake')
mbedtls_proj = cmake.subproject('mbedtls') mbedtls_proj = cmake.subproject('mbedtls')
mbedtls_dep = mbedtls_proj.dependency('mbedtls') mbedtls_dep = mbedtls_proj.dependency('mbedcrypto')
executable('ex01', ['src/ex01/main.c', 'src/utils.c'], dependencies: m_dep, include_directories: incdir) executable('ex01', ['src/ex01/main.c', 'src/utils.c'], dependencies: m_dep, include_directories: incdir)
executable('ex02', ['src/ex02/main.c', 'src/utils.c'], dependencies: m_dep, include_directories: incdir) executable('ex02', ['src/ex02/main.c', 'src/utils.c'], dependencies: m_dep, include_directories: incdir)

16
src/ex07/main.c
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@ -1,9 +1,9 @@
#include "mbedtls/aes.h"
#include "utils.h" #include "utils.h"
#include <ctype.h> #include <ctype.h>
#include <math.h> #include <math.h>
#include <stdio.h> #include <stdio.h>
#include <string.h> #include <string.h>
#include "mbedtls/aes.h"
#define BUF_SIZE 4096 #define BUF_SIZE 4096
@ -37,6 +37,20 @@ int main(int argc, char *argv[]) {
} }
mbedtls_aes_context aes; mbedtls_aes_context aes;
mbedtls_aes_init(&aes);
int err =
mbedtls_aes_setkey_dec(&aes, (const unsigned char *)key, strlen(key) * 8);
if (err) {
printf("Key should be 16, 24, or 32 bytes long\n");
return EXIT_FAILURE;
}
unsigned char output[BUF_SIZE] = {0};
err = mbedtls_aes_crypt_ecb(&aes, MBEDTLS_AES_DECRYPT, buf, output);
if (err) {
printf("Could not decode buffer\n");
return EXIT_FAILURE;
}
if (fclose(fp)) { if (fclose(fp)) {
printf("Error closing file %s\n", filename); printf("Error closing file %s\n", filename);