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blob: base64 encoding and decoding 

and prefer sha1 checksums to be stored in base64 encoded format.
cute-signatures
Timo Teras 2009-07-15 14:48:57 +03:00
parent bfabf8f8d9
commit a7c5fda40a
2 changed files with 130 additions and 18 deletions
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2
src/apk_blob.h
View File

@ -92,11 +92,13 @@ static inline const int apk_checksum_compare(const struct apk_checksum *a,
void apk_blob_push_blob(apk_blob_t *to, apk_blob_t literal);
void apk_blob_push_uint(apk_blob_t *to, unsigned int value, int radix);
void apk_blob_push_csum(apk_blob_t *to, struct apk_checksum *csum);
void apk_blob_push_base64(apk_blob_t *to, apk_blob_t binary);
void apk_blob_push_hexdump(apk_blob_t *to, apk_blob_t binary);
void apk_blob_pull_char(apk_blob_t *b, int expected);
unsigned int apk_blob_pull_uint(apk_blob_t *b, int radix);
void apk_blob_pull_csum(apk_blob_t *b, struct apk_checksum *csum);
void apk_blob_pull_base64(apk_blob_t *b, apk_blob_t to);
void apk_blob_pull_hexdump(apk_blob_t *b, apk_blob_t to);
#endif

146
src/blob.c
View File

@ -186,14 +186,6 @@ void apk_blob_push_uint(apk_blob_t *to, unsigned int value, int radix)
apk_blob_push_blob(to, APK_BLOB_PTR_PTR(ptr+1, &buf[sizeof(buf)-1]));
}
static int checksum_char_to_id(char chr)
{
switch (chr) {
case '1': return APK_CHECKSUM_SHA1;
}
return APK_CHECKSUM_NONE;
}
void apk_blob_push_csum(apk_blob_t *to, struct apk_checksum *csum)
{
switch (csum->type) {
@ -201,8 +193,8 @@ void apk_blob_push_csum(apk_blob_t *to, struct apk_checksum *csum)
apk_blob_push_hexdump(to, APK_BLOB_CSUM(*csum));
break;
case APK_CHECKSUM_SHA1:
apk_blob_push_blob(to, APK_BLOB_STR("X1"));
apk_blob_push_hexdump(to, APK_BLOB_CSUM(*csum));
apk_blob_push_blob(to, APK_BLOB_STR("Q1"));
apk_blob_push_base64(to, APK_BLOB_CSUM(*csum));
break;
default:
*to = APK_BLOB_NULL;
@ -231,6 +223,42 @@ void apk_blob_push_hexdump(apk_blob_t *to, apk_blob_t binary)
to->len -= binary.len * 2;
}
static const char b64encode[] =
"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
static inline void push_b64_chunk(unsigned char *to, const unsigned char *from, int len)
{
to[0] = b64encode[from[0] >> 2];
to[1] = b64encode[((from[0] & 0x03) << 4) | ((from[1] & 0xf0) >> 4)];
to[2] = len < 2 ? '=' : b64encode[((from[1] & 0x0f) << 2) |
((from[2] & 0xc0) >> 6)];
to[3] = len < 3 ? '=' : b64encode[from[2] & 0x3f ];
}
void apk_blob_push_base64(apk_blob_t *to, apk_blob_t binary)
{
unsigned char *src = (unsigned char *) binary.ptr;
unsigned char *dst = (unsigned char *) to->ptr;
int i, needed;
if (unlikely(APK_BLOB_IS_NULL(*to)))
return;
needed = ((binary.len + 2) / 3) * 4;
if (unlikely(to->len < needed)) {
*to = APK_BLOB_NULL;
return;
}
for (i = 0; i < binary.len / 3; i++, src += 3, dst += 4)
push_b64_chunk(dst, src, 4);
i = binary.len % 3;
if (i != 0)
push_b64_chunk(dst, src, i);
to->ptr += needed;
to->len -= needed;
}
void apk_blob_pull_char(apk_blob_t *b, int expected)
{
if (unlikely(APK_BLOB_IS_NULL(*b)))
@ -265,6 +293,8 @@ unsigned int apk_blob_pull_uint(apk_blob_t *b, int radix)
void apk_blob_pull_csum(apk_blob_t *b, struct apk_checksum *csum)
{
int encoding;
if (unlikely(APK_BLOB_IS_NULL(*b)))
return;
@ -273,17 +303,34 @@ void apk_blob_pull_csum(apk_blob_t *b, struct apk_checksum *csum)
return;
}
switch (b->ptr[0]) {
case 'X':
csum->type = checksum_char_to_id(b->ptr[1]);
b->ptr += 2;
b->len -= 2;
apk_blob_pull_hexdump(b, APK_BLOB_CSUM(*csum));
break;
default:
if (dx(b->ptr[0]) != -1) {
/* Assume MD5 for backwards compatibility */
csum->type = APK_CHECKSUM_MD5;
apk_blob_pull_hexdump(b, APK_BLOB_CSUM(*csum));
return;
}
encoding = b->ptr[0];
switch (b->ptr[1]) {
case '1':
csum->type = APK_CHECKSUM_SHA1;
break;
default:
*b = APK_BLOB_NULL;
return;
}
b->ptr += 2;
b->len -= 2;
switch (encoding) {
case 'X':
apk_blob_pull_hexdump(b, APK_BLOB_CSUM(*csum));
break;
case 'Q':
apk_blob_pull_base64(b, APK_BLOB_CSUM(*csum));
break;
default:
*b = APK_BLOB_NULL;
break;
}
}
@ -314,3 +361,66 @@ void apk_blob_pull_hexdump(apk_blob_t *b, apk_blob_t to)
err:
*b = APK_BLOB_NULL;
}
static unsigned char b64decode[] = {
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x3e, 0xff, 0xff, 0xff, 0x3f,
0x34, 0x35, 0x36, 0x37, 0x38, 0x39, 0x3a, 0x3b, 0x3c, 0x3d, 0xff, 0xff,
0xff, 0x00, 0xff, 0xff, 0xff, 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06,
0x07, 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f, 0x10, 0x11, 0x12,
0x13, 0x14, 0x15, 0x16, 0x17, 0x18, 0x19, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f, 0x20, 0x21, 0x22, 0x23, 0x24,
0x25, 0x26, 0x27, 0x28, 0x29, 0x2a, 0x2b, 0x2c, 0x2d, 0x2e, 0x2f, 0x30,
0x31, 0x32, 0x33, 0xff, 0xff, 0xff, 0xff, 0xff
};
static inline int pull_b64_chunk(unsigned char *to, const unsigned char *from, int len)
{
unsigned char tmp[4];
int i;
for (i = 0; i < 4; i++) {
if (unlikely(from[i] >= 0x80))
return -1;
tmp[i] = b64decode[from[i]];
if (unlikely(tmp[i] == 0xff))
return -1;
}
to[0] = (tmp[0] << 2 | tmp[1] >> 4);
if (len > 1)
to[1] = (tmp[1] << 4 | tmp[2] >> 2);
else if (unlikely(from[2] != '='))
return -1;
if (len > 2)
to[2] = (((tmp[2] << 6) & 0xc0) | tmp[3]);
else if (unlikely(from[3] != '='))
return -1;
return 0;
}
void apk_blob_pull_base64(apk_blob_t *b, apk_blob_t to)
{
unsigned char *src = (unsigned char *) b->ptr;
unsigned char *dst = (unsigned char *) to.ptr;
int i, needed;
if (unlikely(APK_BLOB_IS_NULL(*b)))
return;
needed = ((to.len + 2) / 3) * 4;
if (unlikely(b->len < needed)) {
*b = APK_BLOB_NULL;
return;
}
for (i = 0; i < to.len / 3; i++, src += 4, dst += 3)
pull_b64_chunk(dst, src, 4);
i = to.len % 3;
if (i != 0)
pull_b64_chunk(dst, src, i);
b->ptr += needed;
b->len -= needed;
}