diff options
Diffstat (limited to 'crypto/src/math/ec/rfc8032/ScalarUtilities.cs')
| -rw-r--r-- | crypto/src/math/ec/rfc8032/ScalarUtilities.cs | 216 |
1 files changed, 166 insertions, 50 deletions
diff --git a/crypto/src/math/ec/rfc8032/ScalarUtilities.cs b/crypto/src/math/ec/rfc8032/ScalarUtilities.cs index c70a4f2e8..41d7f2696 100644 --- a/crypto/src/math/ec/rfc8032/ScalarUtilities.cs +++ b/crypto/src/math/ec/rfc8032/ScalarUtilities.cs @@ -12,62 +12,120 @@ namespace Org.BouncyCastle.Math.EC.Rfc8032 { #if NETCOREAPP2_1_OR_GREATER || NETSTANDARD2_1_OR_GREATER [MethodImpl(MethodImplOptions.AggressiveInlining)] - internal static void AddShifted_NP(int last, int s, Span<uint> Nu, ReadOnlySpan<uint> Nv, Span<uint> _p) + internal static void AddShifted_NP(int last, int s, Span<uint> Nu, ReadOnlySpan<uint> Nv, Span<uint> p, Span<uint> t) #else - internal static void AddShifted_NP(int last, int s, uint[] Nu, uint[] Nv, uint[] _p) + internal static void AddShifted_NP(int last, int s, uint[] Nu, uint[] Nv, uint[] p, uint[] t) #endif { - int sWords = s >> 5, sBits = s & 31; - - ulong cc__p = 0UL; + ulong cc_p = 0UL; ulong cc_Nu = 0UL; - if (sBits == 0) + if (s == 0) { - for (int i = sWords; i <= last; ++i) + for (int i = 0; i <= last; ++i) { + uint p_i = p[i]; + cc_Nu += Nu[i]; - cc_Nu += _p[i - sWords]; + cc_Nu += p_i; - cc__p += _p[i]; - cc__p += Nv[i - sWords]; - _p[i] = (uint)cc__p; cc__p >>= 32; + cc_p += p_i; + cc_p += Nv[i]; + p_i = (uint)cc_p; cc_p >>= 32; + p[i] = p_i; - cc_Nu += _p[i - sWords]; + cc_Nu += p_i; Nu[i] = (uint)cc_Nu; cc_Nu >>= 32; } } - else + else if (s < 32) { uint prev_p = 0U; uint prev_q = 0U; uint prev_v = 0U; - for (int i = sWords; i <= last; ++i) + for (int i = 0; i <= last; ++i) { - uint next_p = _p[i - sWords]; - uint p_s = (next_p << sBits) | (prev_p >> -sBits); - prev_p = next_p; + uint p_i = p[i]; + uint p_s = (p_i << s) | (prev_p >> -s); + prev_p = p_i; cc_Nu += Nu[i]; cc_Nu += p_s; - uint next_v = Nv[i - sWords]; - uint v_s = (next_v << sBits) | (prev_v >> -sBits); + uint next_v = Nv[i]; + uint v_s = (next_v << s) | (prev_v >> -s); prev_v = next_v; - cc__p += _p[i]; - cc__p += v_s; - _p[i] = (uint)cc__p; cc__p >>= 32; + cc_p += p_i; + cc_p += v_s; + p_i = (uint)cc_p; cc_p >>= 32; + p[i] = p_i; - uint next_q = _p[i - sWords]; - uint q_s = (next_q << sBits) | (prev_q >> -sBits); - prev_q = next_q; + uint q_s = (p_i << s) | (prev_q >> -s); + prev_q = p_i; cc_Nu += q_s; Nu[i] = (uint)cc_Nu; cc_Nu >>= 32; } } + else + { + // Copy the low limbs of the original p +#if NETCOREAPP2_1_OR_GREATER || NETSTANDARD2_1_OR_GREATER + t[..last].CopyFrom(p); +#else + Array.Copy(p, 0, t, 0, last); +#endif + + int sWords = s >> 5, sBits = s & 31; + if (sBits == 0) + { + for (int i = sWords; i <= last; ++i) + { + cc_Nu += Nu[i]; + cc_Nu += t[i - sWords]; + + cc_p += p[i]; + cc_p += Nv[i - sWords]; + p[i] = (uint)cc_p; cc_p >>= 32; + + cc_Nu += p[i - sWords]; + Nu[i] = (uint)cc_Nu; cc_Nu >>= 32; + } + } + else + { + uint prev_t = 0U; + uint prev_q = 0U; + uint prev_v = 0U; + + for (int i = sWords; i <= last; ++i) + { + uint next_t = t[i - sWords]; + uint t_s = (next_t << sBits) | (prev_t >> -sBits); + prev_t = next_t; + + cc_Nu += Nu[i]; + cc_Nu += t_s; + + uint next_v = Nv[i - sWords]; + uint v_s = (next_v << sBits) | (prev_v >> -sBits); + prev_v = next_v; + + cc_p += p[i]; + cc_p += v_s; + p[i] = (uint)cc_p; cc_p >>= 32; + + uint next_q = p[i - sWords]; + uint q_s = (next_q << sBits) | (prev_q >> -sBits); + prev_q = next_q; + + cc_Nu += q_s; + Nu[i] = (uint)cc_Nu; cc_Nu >>= 32; + } + } + } } #if NETCOREAPP2_1_OR_GREATER || NETSTANDARD2_1_OR_GREATER @@ -171,62 +229,120 @@ namespace Org.BouncyCastle.Math.EC.Rfc8032 #if NETCOREAPP2_1_OR_GREATER || NETSTANDARD2_1_OR_GREATER [MethodImpl(MethodImplOptions.AggressiveInlining)] - internal static void SubShifted_NP(int last, int s, Span<uint> Nu, ReadOnlySpan<uint> Nv, Span<uint> _p) + internal static void SubShifted_NP(int last, int s, Span<uint> Nu, ReadOnlySpan<uint> Nv, Span<uint> p, Span<uint> t) #else - internal static void SubShifted_NP(int last, int s, uint[] Nu, uint[] Nv, uint[] _p) + internal static void SubShifted_NP(int last, int s, uint[] Nu, uint[] Nv, uint[] p, uint[] t) #endif { - int sWords = s >> 5, sBits = s & 31; - - long cc__p = 0L; + long cc_p = 0L; long cc_Nu = 0L; - if (sBits == 0) + if (s == 0) { - for (int i = sWords; i <= last; ++i) + for (int i = 0; i <= last; ++i) { + uint p_i = p[i]; + cc_Nu += Nu[i]; - cc_Nu -= _p[i - sWords]; + cc_Nu -= p_i; - cc__p += _p[i]; - cc__p -= Nv[i - sWords]; - _p[i] = (uint)cc__p; cc__p >>= 32; + cc_p += p_i; + cc_p -= Nv[i]; + p_i = (uint)cc_p; cc_p >>= 32; + p[i] = p_i; - cc_Nu -= _p[i - sWords]; + cc_Nu -= p_i; Nu[i] = (uint)cc_Nu; cc_Nu >>= 32; } } - else + else if (s < 32) { uint prev_p = 0U; uint prev_q = 0U; uint prev_v = 0U; - for (int i = sWords; i <= last; ++i) + for (int i = 0; i <= last; ++i) { - uint next_p = _p[i - sWords]; - uint p_s = (next_p << sBits) | (prev_p >> -sBits); - prev_p = next_p; + uint p_i = p[i]; + uint p_s = (p_i << s) | (prev_p >> -s); + prev_p = p_i; cc_Nu += Nu[i]; cc_Nu -= p_s; - uint next_v = Nv[i - sWords]; - uint v_s = (next_v << sBits) | (prev_v >> -sBits); + uint next_v = Nv[i]; + uint v_s = (next_v << s) | (prev_v >> -s); prev_v = next_v; - cc__p += _p[i]; - cc__p -= v_s; - _p[i] = (uint)cc__p; cc__p >>= 32; + cc_p += p_i; + cc_p -= v_s; + p_i = (uint)cc_p; cc_p >>= 32; + p[i] = p_i; - uint next_q = _p[i - sWords]; - uint q_s = (next_q << sBits) | (prev_q >> -sBits); - prev_q = next_q; + uint q_s = (p_i << s) | (prev_q >> -s); + prev_q = p_i; cc_Nu -= q_s; Nu[i] = (uint)cc_Nu; cc_Nu >>= 32; } } + else + { + // Copy the low limbs of the original p +#if NETCOREAPP2_1_OR_GREATER || NETSTANDARD2_1_OR_GREATER + t[..last].CopyFrom(p); +#else + Array.Copy(p, 0, t, 0, last); +#endif + + int sWords = s >> 5, sBits = s & 31; + if (sBits == 0) + { + for (int i = sWords; i <= last; ++i) + { + cc_Nu += Nu[i]; + cc_Nu -= t[i - sWords]; + + cc_p += p[i]; + cc_p -= Nv[i - sWords]; + p[i] = (uint)cc_p; cc_p >>= 32; + + cc_Nu -= p[i - sWords]; + Nu[i] = (uint)cc_Nu; cc_Nu >>= 32; + } + } + else + { + uint prev_t = 0U; + uint prev_q = 0U; + uint prev_v = 0U; + + for (int i = sWords; i <= last; ++i) + { + uint next_t = t[i - sWords]; + uint t_s = (next_t << sBits) | (prev_t >> -sBits); + prev_t = next_t; + + cc_Nu += Nu[i]; + cc_Nu -= t_s; + + uint next_v = Nv[i - sWords]; + uint v_s = (next_v << sBits) | (prev_v >> -sBits); + prev_v = next_v; + + cc_p += p[i]; + cc_p -= v_s; + p[i] = (uint)cc_p; cc_p >>= 32; + + uint next_q = p[i - sWords]; + uint q_s = (next_q << sBits) | (prev_q >> -sBits); + prev_q = next_q; + + cc_Nu -= q_s; + Nu[i] = (uint)cc_Nu; cc_Nu >>= 32; + } + } + } } #if NETCOREAPP2_1_OR_GREATER || NETSTANDARD2_1_OR_GREATER |