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Fix bug in blech32

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This commit is contained in:
Steven Roose 2019-04-23 20:38:28 +01:00
parent 0de2b056d1
commit 64129703a8
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1 changed files with 2 additions and 2 deletions
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src/blech32.cpp
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@ -41,7 +41,7 @@ data Cat(data x, const data& y)
/** This function will compute what 6 5-bit values to XOR into the last 6 input values, in order to /** This function will compute what 6 5-bit values to XOR into the last 6 input values, in order to
* make the checksum 0. These 6 values are packed together in a single 30-bit integer. The higher * make the checksum 0. These 6 values are packed together in a single 30-bit integer. The higher
* bits correspond to earlier values. */ * bits correspond to earlier values. */
uint32_t PolyMod(const data& v) uint64_t PolyMod(const data& v)
{ {
// The input is interpreted as a list of coefficients of a polynomial over F = GF(32), with an // The input is interpreted as a list of coefficients of a polynomial over F = GF(32), with an
// implicit 1 in front. If the input is [v0,v1,v2,v3,v4], that polynomial is v(x) = // implicit 1 in front. If the input is [v0,v1,v2,v3,v4], that polynomial is v(x) =
@ -136,7 +136,7 @@ data CreateChecksum(const std::string& hrp, const data& values)
{ {
data enc = Cat(ExpandHRP(hrp), values); data enc = Cat(ExpandHRP(hrp), values);
enc.resize(enc.size() + 12); // ELEMENTS: Append 6->12 zeroes enc.resize(enc.size() + 12); // ELEMENTS: Append 6->12 zeroes
uint32_t mod = PolyMod(enc) ^ 1; // Determine what to XOR into those 6 zeroes. uint64_t mod = PolyMod(enc) ^ 1; // Determine what to XOR into those 6 zeroes.
data ret(12); // ELEMENTS: 6->12 data ret(12); // ELEMENTS: 6->12
for (size_t i = 0; i < 12; ++i) { // ELEMENTS: 6->12 for (size_t i = 0; i < 12; ++i) { // ELEMENTS: 6->12
// Convert the 5-bit groups in mod to checksum values. // Convert the 5-bit groups in mod to checksum values.