void ECRYPT_decrypt_packet(
ECRYPT_ctx* ctx,
const u8* iv,
const u8* ciphertext,
u8* plaintext,
u32 msglen)
{
ECRYPT_ivsetup(ctx, iv);
ECRYPT_decrypt_bytes(ctx, ciphertext, plaintext, msglen);
}
void ECRYPT_process_bytes(
int action, /* 0 = encrypt; 1 = decrypt; */
ECRYPT_ctx* ctx,
const u8* input,
u8* output,
u32 msglen) /* Message length in bytes. */
{
if (action == 0)
ECRYPT_encrypt_bytes(ctx, input, output, msglen);
else
ECRYPT_decrypt_bytes(ctx, input, output, msglen);
}
int main(int argc, char **argv) {
char *input, *output;
unsigned char *input_data;
struct stat in_st;
int input_fd, output_fd;
int i;
unsigned char tmp[64];
ECRYPT_ctx ctx;
if (argc != 3) {
fprintf(stderr, "usage: %s input output\n", argv[0]);
exit(EXIT_FAILURE);
}
input = argv[1]; output = argv[2];
init_ctx(&ctx);
if (stat(input, &in_st) == -1) {
perror("stat");
exit(EXIT_FAILURE);
}
input_fd = open(input, O_RDONLY);
if (input_fd == -1) {
perror("open");
exit(EXIT_FAILURE);
}
output_fd = creat(output, S_IRWXU);
if (output_fd == -1) {
perror("open");
exit(EXIT_FAILURE);
}
input_data = mmap(NULL, in_st.st_size, PROT_READ, MAP_SHARED, input_fd, 0);
if (input_data == (void *) -1) {
perror("mmap");
exit(EXIT_FAILURE);
}
ECRYPT_init();
for (i = 0; i < (in_st.st_size / 64); i++) {
ECRYPT_decrypt_bytes(&ctx, input_data + 64 * i, tmp, 64);
write(output_fd, tmp, 64);
}
close(output_fd);
munmap(input_data, in_st.st_size);
close(input_fd);
exit(EXIT_SUCCESS);
}
void ECRYPT_process_packet(
int action,
ECRYPT_ctx* ctx,
const u8* iv,
const u8* input,
u8* output,
u32 msglen)
{
ECRYPT_ivsetup(ctx, iv);
#ifdef ECRYPT_HAS_SINGLE_BYTE_FUNCTION
ECRYPT_process_bytes(action, ctx, input, output, msglen);
#else
if (action == 0)
ECRYPT_encrypt_bytes(ctx, input, output, msglen);
else
ECRYPT_decrypt_bytes(ctx, input, output, msglen);
#endif
}
