diff options
Diffstat (limited to 'crypto/src/math/ec/rfc7748/X448Field.cs')
| -rw-r--r-- | crypto/src/math/ec/rfc7748/X448Field.cs | 87 |
1 files changed, 87 insertions, 0 deletions
diff --git a/crypto/src/math/ec/rfc7748/X448Field.cs b/crypto/src/math/ec/rfc7748/X448Field.cs index 70273aea8..a91ea0d5b 100644 --- a/crypto/src/math/ec/rfc7748/X448Field.cs +++ b/crypto/src/math/ec/rfc7748/X448Field.cs @@ -173,6 +173,20 @@ namespace Org.BouncyCastle.Math.EC.Rfc7748 Decode56(x, xOff + 49, z, 14); } +#if NETCOREAPP2_1_OR_GREATER || NETSTANDARD2_1_OR_GREATER + public static void Decode(ReadOnlySpan<byte> x, Span<uint> z) + { + Decode56(x, z); + Decode56(x[7..], z[2..]); + Decode56(x[14..], z[4..]); + Decode56(x[21..], z[6..]); + Decode56(x[28..], z[8..]); + Decode56(x[35..], z[10..]); + Decode56(x[42..], z[12..]); + Decode56(x[49..], z[14..]); + } +#endif + private static void Decode224(uint[] x, int xOff, uint[] z, int zOff) { uint x0 = x[xOff + 0], x1 = x[xOff + 1], x2 = x[xOff + 2], x3 = x[xOff + 3]; @@ -196,6 +210,16 @@ namespace Org.BouncyCastle.Math.EC.Rfc7748 return n; } +#if NETCOREAPP2_1_OR_GREATER || NETSTANDARD2_1_OR_GREATER + private static uint Decode24(ReadOnlySpan<byte> bs) + { + uint n = bs[0]; + n |= (uint)bs[1] << 8; + n |= (uint)bs[2] << 16; + return n; + } +#endif + private static uint Decode32(byte[] bs, int off) { uint n = bs[off]; @@ -205,6 +229,17 @@ namespace Org.BouncyCastle.Math.EC.Rfc7748 return n; } +#if NETCOREAPP2_1_OR_GREATER || NETSTANDARD2_1_OR_GREATER + private static uint Decode32(ReadOnlySpan<byte> bs) + { + uint n = bs[0]; + n |= (uint)bs[1] << 8; + n |= (uint)bs[2] << 16; + n |= (uint)bs[3] << 24; + return n; + } +#endif + private static void Decode56(byte[] bs, int off, uint[] z, int zOff) { uint lo = Decode32(bs, off); @@ -213,6 +248,16 @@ namespace Org.BouncyCastle.Math.EC.Rfc7748 z[zOff + 1] = (lo >> 28) | (hi << 4); } +#if NETCOREAPP2_1_OR_GREATER || NETSTANDARD2_1_OR_GREATER + private static void Decode56(ReadOnlySpan<byte> bs, Span<uint> z) + { + uint lo = Decode32(bs); + uint hi = Decode24(bs[4..]); + z[0] = lo & M28; + z[1] = (lo >> 28) | (hi << 4); + } +#endif + public static void Encode(uint[] x, uint[] z, int zOff) { Encode224(x, 0, z, zOff); @@ -231,6 +276,20 @@ namespace Org.BouncyCastle.Math.EC.Rfc7748 Encode56(x, 14, z, zOff + 49); } +#if NETCOREAPP2_1_OR_GREATER || NETSTANDARD2_1_OR_GREATER + public static void Encode(ReadOnlySpan<uint> x, Span<byte> z) + { + Encode56(x, z); + Encode56(x[2..], z[7..]); + Encode56(x[4..], z[14..]); + Encode56(x[6..], z[21..]); + Encode56(x[8..], z[28..]); + Encode56(x[10..], z[35..]); + Encode56(x[12..], z[42..]); + Encode56(x[14..], z[49..]); + } +#endif + private static void Encode224(uint[] x, int xOff, uint[] z, int zOff) { uint x0 = x[xOff + 0], x1 = x[xOff + 1], x2 = x[xOff + 2], x3 = x[xOff + 3]; @@ -252,6 +311,15 @@ namespace Org.BouncyCastle.Math.EC.Rfc7748 bs[++off] = (byte)(n >> 16); } +#if NETCOREAPP2_1_OR_GREATER || NETSTANDARD2_1_OR_GREATER + private static void Encode24(uint n, Span<byte> bs) + { + bs[0] = (byte)(n ); + bs[1] = (byte)(n >> 8); + bs[2] = (byte)(n >> 16); + } +#endif + private static void Encode32(uint n, byte[] bs, int off) { bs[ off] = (byte)(n ); @@ -260,6 +328,16 @@ namespace Org.BouncyCastle.Math.EC.Rfc7748 bs[++off] = (byte)(n >> 24); } +#if NETCOREAPP2_1_OR_GREATER || NETSTANDARD2_1_OR_GREATER + private static void Encode32(uint n, Span<byte> bs) + { + bs[0] = (byte)(n ); + bs[1] = (byte)(n >> 8); + bs[2] = (byte)(n >> 16); + bs[3] = (byte)(n >> 24); + } +#endif + private static void Encode56(uint[] x, int xOff, byte[] bs, int off) { uint lo = x[xOff], hi = x[xOff + 1]; @@ -267,6 +345,15 @@ namespace Org.BouncyCastle.Math.EC.Rfc7748 Encode24(hi >> 4, bs, off + 4); } +#if NETCOREAPP2_1_OR_GREATER || NETSTANDARD2_1_OR_GREATER + private static void Encode56(ReadOnlySpan<uint> x, Span<byte> bs) + { + uint lo = x[0], hi = x[1]; + Encode32(lo | (hi << 28), bs); + Encode24(hi >> 4, bs[4..]); + } +#endif + public static void Inv(uint[] x, uint[] z) { //uint[] t = Create(); |