void init_cipher(struct encryption_ctx *ctx, const unsigned char *iv, size_t iv_len, int is_cipher) {
ctx->status = STATUS_INIT;
if (ctx->cipher == CIPHER_OPENSSL) {
EVP_CIPHER_CTX_init(ctx->ctx);
EVP_CipherInit_ex(ctx->ctx, _cipher, NULL, NULL, NULL, is_cipher);
if (!EVP_CIPHER_CTX_set_key_length(ctx->ctx, _key_len)) {
cleanup_encryption(ctx);
return;
}
EVP_CIPHER_CTX_set_padding(ctx->ctx, 1);
unsigned char *true_key;
if (_method == ENCRYPTION_RC4_MD5) {
unsigned char key_iv[32];
memcpy(key_iv, _key, 16);
memcpy(key_iv + 16, iv, 16);
true_key = MD5(key_iv, 32, NULL);
} else {
true_key = _key;
}
EVP_CipherInit_ex(ctx->ctx, NULL, NULL, true_key, iv, is_cipher);
} else if (ctx->cipher == CIPHER_SODIUM) {
ctx->ic = 0;
ctx->bytes_remaining = 0;
}
ctx->iv_len = encryption_iv_len[_method];
}
void init_cipher(struct encryption_ctx *ctx, const unsigned char *iv, int iv_len, int is_cipher) {
ctx->status = STATUS_INIT;
if (_method != EncryptionTable) {
EVP_CIPHER_CTX_init(ctx->ctx);
EVP_CipherInit_ex(ctx->ctx, _cipher, NULL, NULL, NULL, is_cipher);
if (!EVP_CIPHER_CTX_set_key_length(ctx->ctx, _key_len)) {
cleanup_encryption(ctx);
// NSLog(@"Invalid key length");
// assert(0);
// TODO free memory and report error
return;
}
EVP_CIPHER_CTX_set_padding(ctx->ctx, 1);
EVP_CipherInit_ex(ctx->ctx, NULL, NULL, _key, iv, is_cipher);
}
}
