diff options
Diffstat (limited to 'lib/crypto/src/crypto.erl')
| -rw-r--r-- | lib/crypto/src/crypto.erl | 79 |
1 files changed, 44 insertions, 35 deletions
diff --git a/lib/crypto/src/crypto.erl b/lib/crypto/src/crypto.erl index 1328a95e87..f5c1cd2845 100644 --- a/lib/crypto/src/crypto.erl +++ b/lib/crypto/src/crypto.erl @@ -787,17 +787,15 @@ rand_uniform_nif(_From,_To) -> ?nif_stub. %% mod_exp(Base, Exponent, Modulo) when is_integer(Base), is_integer(Exponent), is_integer(Modulo) -> - erlint(mod_exp(mpint(Base), mpint(Exponent), mpint(Modulo))); + bin_to_int(mod_exp_nif(int_to_bin(Base), int_to_bin(Exponent), int_to_bin(Modulo), 0)); mod_exp(Base, Exponent, Modulo) -> - case mod_exp_nif(Base,Exponent,Modulo) of - <<Len:32/integer, MSB, Rest/binary>> when MSB > 127 -> - <<(Len + 1):32/integer, 0, MSB, Rest/binary>>; - Whatever -> - Whatever + mod_exp_nif(mpint_to_bin(Base),mpint_to_bin(Exponent),mpint_to_bin(Modulo), 4). + end. -mod_exp_nif(_Base,_Exp,_Mod) -> ?nif_stub. + +mod_exp_nif(_Base,_Exp,_Mod,_bin_hdr) -> ?nif_stub. %% %% DSS, RSA - verify @@ -1071,43 +1069,54 @@ dh_compute_key_nif(_OthersPublicKey, _MyPrivateKey, _DHParameters) -> ?nif_stub. %% large integer in a binary with 32bit length %% MP representaion (SSH2) -mpint(X) when X < 0 -> - case X of - -1 -> - <<0,0,0,1,16#ff>>; - _ -> - mpint_neg(X,0,[]) - end; -mpint(X) -> - case X of - 0 -> - <<0,0,0,0>>; - _ -> - mpint_pos(X,0,[]) - end. +mpint(X) when X < 0 -> mpint_neg(X); +mpint(X) -> mpint_pos(X). -define(UINT32(X), X:32/unsigned-big-integer). -mpint_neg(-1,I,Ds=[MSB|_]) -> - if MSB band 16#80 =/= 16#80 -> - <<?UINT32((I+1)), (list_to_binary([255|Ds]))/binary>>; - true -> - (<<?UINT32(I), (list_to_binary(Ds))/binary>>) - end; -mpint_neg(X,I,Ds) -> - mpint_neg(X bsr 8,I+1,[(X band 255)|Ds]). + +mpint_neg(X) -> + Bin = int_to_bin_neg(X, []), + Sz = byte_size(Bin), + <<?UINT32(Sz), Bin/binary>>. -mpint_pos(0,I,Ds=[MSB|_]) -> +mpint_pos(X) -> + Bin = int_to_bin_pos(X, []), + <<MSB,_/binary>> = Bin, + Sz = byte_size(Bin), if MSB band 16#80 == 16#80 -> - <<?UINT32((I+1)), (list_to_binary([0|Ds]))/binary>>; + <<?UINT32((Sz+1)), 0, Bin/binary>>; true -> - (<<?UINT32(I), (list_to_binary(Ds))/binary>>) - end; -mpint_pos(X,I,Ds) -> - mpint_pos(X bsr 8,I+1,[(X band 255)|Ds]). + <<?UINT32(Sz), Bin/binary>> + end. + +int_to_bin(X) when X < 0 -> int_to_bin_neg(X, []); +int_to_bin(X) -> int_to_bin_pos(X, []). + +int_to_bin_pos(X) when X >= 0 -> + int_to_bin_pos(X, []). + +int_to_bin_pos(0,Ds=[_|_]) -> + list_to_binary(Ds); +int_to_bin_pos(X,Ds) -> + int_to_bin_pos(X bsr 8, [(X band 255)|Ds]). + +int_to_bin_neg(-1, Ds=[MSB|_]) when MSB >= 16#80 -> + list_to_binary(Ds); +int_to_bin_neg(X,Ds) -> + int_to_bin_neg(X bsr 8, [(X band 255)|Ds]). + + +bin_to_int(Bin) -> + Bits = bit_size(Bin), + <<Integer:Bits/integer>> = Bin, + Integer. %% int from integer in a binary with 32bit length erlint(<<MPIntSize:32/integer,MPIntValue/binary>>) -> Bits= MPIntSize * 8, <<Integer:Bits/integer>> = MPIntValue, Integer. + +mpint_to_bin(<<Len:32, Bin:Len/binary>>) -> + Bin. |