base64_decode
key_len = base64_decode(secret, allocated_len, key->key, true, BASE64_STD);
declen = base64_decode(name, name_len,
declen = base64_decode(encsym, enclen, sym, false, BASE64_IMAP);
ret = base64_decode(iname->name, iname->len,
int base64_decode(const char *src, int len, u8 *dst, bool padding, enum base64_variant variant);
EXPORT_SYMBOL_GPL(base64_decode);
int decoded_len = base64_decode(src, strlen(src), buf, padding, variant);
int decoded_len = base64_decode(src, srclen, buf, padding, variant);
m = base64_decode(url_buf, n_url, back, false, BASE64_URLSAFE);
m = base64_decode(imap_buf, n_imap, back, false, BASE64_IMAP);
m = base64_decode(bad, strlen(bad), tmp, false, BASE64_URLSAFE);
m = base64_decode(bad, strlen(bad), tmp, false, BASE64_IMAP);
base64_decode(data, len, dst, true, variant);
int dec_len = base64_decode(enc, enc_len, decoded, true, variant);