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49 lines
1.3 KiB
49 lines
1.3 KiB
#include <cstring>
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#include "md5.h"
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namespace md5 {
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MD5& MD5::Update(const void *data, uint64_t len) {
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if (buffer_size_ != 0) {
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if (buffer_size_ + len < 64) { // buffer not filled
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std::memcpy(buffer_ + buffer_size_, data, len);
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buffer_size_ += len;
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return *this; // save into buffer and return
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}
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auto size = 64 - buffer_size_;
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std::memcpy(buffer_ + buffer_size_, data, size);
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UpdateImpl(buffer_, 64); // fill and update with buffer
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data = static_cast<const char*>(data) + size;
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buffer_size_ = 0;
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len -= size;
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} // buffer is empty for now
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data = UpdateImpl(data, len);
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len &= 0b111111; // len -> [0, 64)
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if (len != 0) {
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std::memcpy(buffer_, data, len); // save remain data into buffer
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buffer_size_ = len;
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}
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return *this;
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}
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static constexpr char HexTable[] = {
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'0','1','2','3','4','5','6','7',
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'8','9','a','b','c','d','e','f',
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};
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std::string MD5::Digest() const {
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std::string result {};
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result.resize(32);
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auto *src = reinterpret_cast<const uint8_t *>(&ctx_);
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for (int i = 0; i < 32; ++src) {
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result[i++] = HexTable[*src >> 4];
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result[i++] = HexTable[*src & 0b1111];
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}
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return result;
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}
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} // namespace md5
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