3  * Copyright (c) 2005-2019, Jouni Malinen <j@w1.fi>
19 	"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789-_";
26 static char * base64_gen_encode(const unsigned char *src, size_t len,  in base64_gen_encode()  argument
36 	olen = len * 4 / 3 + 4; /* 3-byte blocks to 4-byte */  in base64_gen_encode()
46 	end = src + len;  in base64_gen_encode()
47 	in = src;  in base64_gen_encode()
50 	while (end - in >= 3) {  in base64_gen_encode()
51 		*pos++ = table[(in[0] >> 2) & 0x3f];  in base64_gen_encode()
53 		*pos++ = table[(((in[1] & 0x0f) << 2) | (in[2] >> 6)) & 0x3f];  in base64_gen_encode()
54 		*pos++ = table[in[2] & 0x3f];  in base64_gen_encode()
63 	if (end - in) {  in base64_gen_encode()
64 		*pos++ = table[(in[0] >> 2) & 0x3f];  in base64_gen_encode()
65 		if (end - in == 1) {  in base64_gen_encode()
72 			*pos++ = table[((in[1] & 0x0f) << 2) & 0x3f];  in base64_gen_encode()
84 		*out_len = pos - out;  in base64_gen_encode()
89 static unsigned char * base64_gen_decode(const char *src, size_t len,  in base64_gen_decode()  argument
98 	for (i = 0; i < sizeof(base64_table) - 1; i++)  in base64_gen_decode()
104 		if (dtable[(unsigned char) src[i]] != 0x80)  in base64_gen_decode()
110 	extra_pad = (4 - count % 4) % 4;  in base64_gen_decode()
124 			val = src[i];  in base64_gen_decode()
134 			*pos++ = (block[0] << 2) | (block[1] >> 4);  in base64_gen_decode()
135 			*pos++ = (block[1] << 4) | (block[2] >> 2);  in base64_gen_decode()
136 			*pos++ = (block[2] << 6) | block[3];  in base64_gen_decode()
140 					pos--;  in base64_gen_decode()
141 				else if (pad == 2)  in base64_gen_decode()
142 					pos -= 2;  in base64_gen_decode()
153 	*out_len = pos - out;  in base64_gen_decode()
159  * base64_encode - Base64 encode
160  * @src: Data to be encoded
170 char * base64_encode(const void *src, size_t len, size_t *out_len)  in base64_encode()  argument
172 	return base64_gen_encode(src, len, out_len, base64_table,  in base64_encode()
177 char * base64_encode_no_lf(const void *src, size_t len, size_t *out_len)  in base64_encode_no_lf()  argument
179 	return base64_gen_encode(src, len, out_len, base64_table, BASE64_PAD);  in base64_encode_no_lf()
183 char * base64_url_encode(const void *src, size_t len, size_t *out_len)  in base64_url_encode()  argument
185 	return base64_gen_encode(src, len, out_len, base64_url_table, 0);  in base64_url_encode()
190  * base64_decode - Base64 decode
191  * @src: Data to be decoded
199 unsigned char * base64_decode(const char *src, size_t len, size_t *out_len)  in base64_decode()  argument
201 	return base64_gen_decode(src, len, out_len, base64_table);  in base64_decode()
205 unsigned char * base64_url_decode(const char *src, size_t len, size_t *out_len)  in base64_url_decode()  argument
207 	return base64_gen_decode(src, len, out_len, base64_url_table);  in base64_url_decode()