diff options
Diffstat (limited to 'lib')
| -rw-r--r-- | lib/crypto/bld.sub | 1 | ||||
| -rw-r--r-- | lib/crypto/ctbig.myr | 52 |
2 files changed, 38 insertions, 15 deletions
diff --git a/lib/crypto/bld.sub b/lib/crypto/bld.sub index 1c58997..309ef7d 100644 --- a/lib/crypto/bld.sub +++ b/lib/crypto/bld.sub @@ -22,6 +22,7 @@ lib crypto = # utilities for subtle bits ct.myr + ctbig.myr clear.myr lib ../std:std diff --git a/lib/crypto/ctbig.myr b/lib/crypto/ctbig.myr index 59ff5f7..cf3f92d 100644 --- a/lib/crypto/ctbig.myr +++ b/lib/crypto/ctbig.myr @@ -9,6 +9,8 @@ pkg crypto = ;; generic mkctbign : (v : @a, nbit : std.size -> ctbig#) :: numeric,integral @a + + const ctzero : (nbit : std.size -> ctbig#) const mkctbigle : (v : byte[:], nbit : std.size -> ctbig#) //const mkctbigbe : (v : byte[:], nbit : std.size -> ctbig#) @@ -16,13 +18,13 @@ pkg crypto = const ctbigdup : (v : ctbig# -> ctbig#) const ctlike : (v : ctbig# -> ctbig#) const ct2big : (v : ctbig# -> std.bigint#) - const big2ct : (v : std.bigint#, ndig : std.size -> ctbig#) + const big2ct : (v : std.bigint#, nbit : std.size -> ctbig#) const ctadd : (r : ctbig#, a : ctbig#, b : ctbig# -> void) const ctsub : (r : ctbig#, a : ctbig#, b : ctbig# -> void) const ctmul : (r : ctbig#, a : ctbig#, b : ctbig# -> void) //const ctdivmod : (r : ctbig#, m : ctbig#, a : ctbig#, b : ctbig# -> void) - //const ctmodpow : (r : ctbig#, a : ctbig#, b : ctbig# -> void) + const ctmodpow : (r : ctbig#, a : ctbig#, b : ctbig# -> void) const ctiszero : (v : ctbig# -> bool) const cteq : (a : ctbig#, b : ctbig# -> bool) @@ -33,6 +35,7 @@ pkg crypto = const ctle : (a : ctbig#, b : ctbig# -> bool) ;; +const Bits = 32 const Base = 0x100000000ul generic mkctbign = {v : @a, nbit : std.size :: integral,numeric @a @@ -50,7 +53,14 @@ generic mkctbign = {v : @a, nbit : std.size :: integral,numeric @a if nbit > 32 a.dig[1] = (val >> 32 : uint32) ;; - -> a + -> clip(a) +} + +const ctzero = {nbit + -> std.mk([ + .nbit=nbit, + .dig=std.slalloc(ndig(nbit)), + ]) } const ct2big = {ct @@ -67,10 +77,10 @@ const big2ct = {ct, nbit l = std.min(n, ct.dig.len) v = std.slzalloc(n) std.slcp(v, ct.dig[:l]) - -> std.mk([ + -> clip(std.mk([ .nbit=nbit, .dig=v, - ]) + ])) } const mkctbigle = {v, nbit @@ -96,7 +106,7 @@ const mkctbigle = {v, nbit last |= (v[off] : uint32) << (8 *off) ;; a[o++] = last - -> std.mk([.nbit=nbit, .dig=a]) + -> clip(std.mk([.nbit=nbit, .dig=a])) } const ctlike = {v @@ -146,6 +156,7 @@ const ctsub = {r, a, b v = mux(borrow, v + Base, v) r.dig[i] = (v : uint32) ;; + clip(r) } const ctmul = {r, a, b @@ -176,17 +187,18 @@ const ctmul = {r, a, b std.slfree(a.dig) ;; r.dig = w[:a.dig.len] + clip(r) } -//const ctmodpow = {res, a, b -// /* find rinv, mprime */ -// -// /* convert to monty space */ -// -// /* do the modpow */ -// -// /* and come back */ -//} +const ctmodpow = {res, a, b + /* find rinv, mprime */ + + /* convert to monty space */ + + /* do the modpow */ + + /* and come back */ +} const ctiszero = {a var z, zz @@ -270,3 +282,13 @@ const checksz = {a, b std.assert(a.nbit == b.nbit, "mismatched bit sizes") std.assert(a.dig.len == b.dig.len, "mismatched backing sizes") } + +const clip = {v + var mask, edge + + + edge = v.nbit & (Bits - 1) + mask = (1 << edge) - 1 + v.dig[v.dig.len - 1] &= (mask : uint32) + -> v +} |