if (gcry_cipher_setkey(cipher, pwhash, sizeof(pwhash)) ||
gcry_cipher_setiv(cipher, iv, iv_size) ||
gcry_cipher_decrypt(cipher, b->data, b->len, /* in = */ NULL,
if (gcry_cipher_setkey(cipher, pwhash, sizeof(pwhash)) ||
gcry_cipher_setiv(cipher, iv, iv_size) ||
gcry_cipher_decrypt(cipher, b->data, b->len, /* in = */ NULL,