Fix round_up

1. src/lib/codec/base64/base64.cpp:           :
(round_up<size_t>(input_length, 3) / 3) * 4;
2. src/lib/codec/base64/base64.cpp:           :
(round_up<size_t>(input_length, 4) * 3) / 4;
3. src/lib/filters/transform_filter.cpp:   return round_up(target_size,
update_granularity);
4. src/lib/math/bigint/bigint.cpp:
m_reg.resize(round_up<size_t>(size, 8));
5. src/lib/math/bigint/bigint.cpp:
m_reg.resize(round_up<size_t>((length / WORD_BYTES) + 1, 8));
6. src/lib/math/numbertheory/mp_numth.cpp:   BigInt z(BigInt::Positive,
round_up<size_t>(2*x_sw, 16));
7. src/lib/modes/cbc/cbc.cpp:   return round_up(input_length,
cipher().block_size());
8. src/lib/modes/ecb/ecb.cpp:   return round_up(input_length,
cipher().block_size());
9. src/lib/modes/xts/xts.cpp:   return round_up(input_length,
cipher().block_size());
10. src/lib/pbkdf/pbkdf2/pbkdf2.cpp:   const size_t blocks_needed =
round_up(out_len, prf_sz) / prf_sz;
11. src/lib/tls/tls_record.cpp:   const size_t buf_size = round_up(
12. src/lib/utils/rounding.h:inline T round_up(T n, T align_to)

1. Reason for change
2. Reason for change
3. first argument cannot be 0 (`target_size = 1024`)
4. Is a bug in the current implementation iff `size = 0`
5. first argument cannot be 0
6. round_up should return 0 if `x_sw = 0`
7. ?
8. ?
9. ?
10. first argument cannot be 0 (`if(out_len == 0) return 0;`)
11. first argument is unlikely to be 0 (`iv_size + msg_length + mac_size
+ (block_size ? 1 : 0)`)
12. Implementation

1 files changed, 3 insertions, 7 deletions

diff --git a/src/lib/codec/base64/base64.cpp b/src/lib/codec/base64/base64.cpp
index 1b1767aa1..a63d2b373 100644
--- a/src/lib/codec/base64/base64.cpp
+++ b/src/lib/codec/base64/base64.cpp
@@ -78,9 +78,7 @@ size_t base64_encode(char out[],
 std::string base64_encode(const byte input[],
                           size_t input_length)
    {
-   const size_t output_length = (input_length == 0)
-           ? 0
-           : (round_up<size_t>(input_length, 3) / 3) * 4;
+   const size_t output_length = (round_up(input_length, 3) / 3) * 4;
    std::string output(output_length, 0);
 
    size_t consumed = 0;
@@ -231,10 +229,8 @@ size_t base64_decode(byte output[],
 secure_vector<byte> base64_decode(const char input[],
                                  size_t input_length,
                                  bool ignore_ws)
-   { 
-   const size_t output_length = (input_length == 0)
-           ? 0
-           : (round_up<size_t>(input_length, 4) * 3) / 4;
+   {
+   const size_t output_length = (round_up(input_length, 4) * 3) / 4;
    secure_vector<byte> bin(output_length);
 
    size_t written = base64_decode(bin.data(),