base64: Add no-LF variant for encoding

base64_encode_no_lf() is otherwise identical to base64_encode(), but it
does not add line-feeds to split the output.

Signed-off-by: Jouni Malinen <jouni@codeaurora.org>

src/utils/base64.c

@@ -9,6 +9,7 @@
 #include "includes.h"
 #include <stdint.h>
 
+#include "utils/common.h"
 #include "os.h"
 #include "base64.h"
 
@@ -18,6 +19,10 @@ static const char base64_url_table[65] =
 	"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789-_";
 
 
+#define BASE64_PAD BIT(0)
+#define BASE64_LF BIT(1)
+
+
 static char * base64_gen_encode(const unsigned char *src, size_t len,
 				size_t *out_len, const char *table, int add_pad)
 {
@@ -29,7 +34,7 @@ static char * base64_gen_encode(const unsigned char *src, size_t len,
 	if (len >= SIZE_MAX / 4)
 		return NULL;
 	olen = len * 4 / 3 + 4; /* 3-byte blocks to 4-byte */
-	if (add_pad)
+	if (add_pad & BASE64_LF)
 		olen += olen / 72; /* line feeds */
 	olen++; /* nul termination */
 	if (olen < len)
@@ -49,7 +54,7 @@ static char * base64_gen_encode(const unsigned char *src, size_t len,
 		*pos++ = table[in[2] & 0x3f];
 		in += 3;
 		line_len += 4;
-		if (add_pad && line_len >= 72) {
+		if ((add_pad & BASE64_LF) && line_len >= 72) {
 			*pos++ = '\n';
 			line_len = 0;
 		}
@@ -59,19 +64,19 @@ static char * base64_gen_encode(const unsigned char *src, size_t len,
 		*pos++ = table[(in[0] >> 2) & 0x3f];
 		if (end - in == 1) {
 			*pos++ = table[((in[0] & 0x03) << 4) & 0x3f];
-			if (add_pad)
+			if (add_pad & BASE64_PAD)
 				*pos++ = '=';
 		} else {
 			*pos++ = table[(((in[0] & 0x03) << 4) |
 					(in[1] >> 4)) & 0x3f];
 			*pos++ = table[((in[1] & 0x0f) << 2) & 0x3f];
 		}
-		if (add_pad)
+		if (add_pad & BASE64_PAD)
 			*pos++ = '=';
 		line_len += 4;
 	}
 
-	if (add_pad && line_len)
+	if ((add_pad & BASE64_LF) && line_len)
 		*pos++ = '\n';
 
 	*pos = '\0';
@@ -164,7 +169,14 @@ static unsigned char * base64_gen_decode(const char *src, size_t len,
  */
 char * base64_encode(const void *src, size_t len, size_t *out_len)
 {
-	return base64_gen_encode(src, len, out_len, base64_table, 1);
+	return base64_gen_encode(src, len, out_len, base64_table,
+				 BASE64_PAD | BASE64_LF);
+}
+
+
+char * base64_encode_no_lf(const void *src, size_t len, size_t *out_len)
+{
+	return base64_gen_encode(src, len, out_len, base64_table, BASE64_PAD);
 }
 
 

src/utils/base64.h

@@ -10,6 +10,7 @@
 #define BASE64_H
 
 char * base64_encode(const void *src, size_t len, size_t *out_len);
+char * base64_encode_no_lf(const void *src, size_t len, size_t *out_len);
 unsigned char * base64_decode(const char *src, size_t len, size_t *out_len);
 char * base64_url_encode(const void *src, size_t len, size_t *out_len);
 unsigned char * base64_url_decode(const char *src, size_t len, size_t *out_len);