diff options
Diffstat (limited to 'crypto/src/math/raw/Nat.cs')
| -rw-r--r-- | crypto/src/math/raw/Nat.cs | 27 |
1 files changed, 27 insertions, 0 deletions
diff --git a/crypto/src/math/raw/Nat.cs b/crypto/src/math/raw/Nat.cs index 0f53b1a8b..80ea6d7ce 100644 --- a/crypto/src/math/raw/Nat.cs +++ b/crypto/src/math/raw/Nat.cs @@ -6,6 +6,7 @@ using System.Runtime.InteropServices; #endif using Org.BouncyCastle.Crypto.Utilities; +using Org.BouncyCastle.Utilities; namespace Org.BouncyCastle.Math.Raw { @@ -954,6 +955,32 @@ namespace Org.BouncyCastle.Math.Raw } #endif +#if NETCOREAPP2_1_OR_GREATER || NETSTANDARD2_1_OR_GREATER + public static int GetBitLength(int len, ReadOnlySpan<uint> x) +#else + public static int GetBitLength(int len, uint[] x) +#endif + { + for (int i = len - 1; i >= 0; --i) + { + uint x_i = x[i]; + if (x_i != 0) + return i * 32 + 32 - Integers.NumberOfLeadingZeros((int)x_i); + } + return 0; + } + + public static int GetBitLength(int len, uint[] x, int xOff) + { + for (int i = len - 1; i >= 0; --i) + { + uint x_i = x[xOff + i]; + if (x_i != 0) + return i * 32 + 32 - Integers.NumberOfLeadingZeros((int)x_i); + } + return 0; + } + public static int GetLengthForBits(int bits) { if (bits < 1) |