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-rw-r--r--lib/crypto/src/crypto.erl71
1 files changed, 68 insertions, 3 deletions
diff --git a/lib/crypto/src/crypto.erl b/lib/crypto/src/crypto.erl
index f5c1cd2845..0a0ebc05c4 100644
--- a/lib/crypto/src/crypto.erl
+++ b/lib/crypto/src/crypto.erl
@@ -57,7 +57,11 @@
-export([dh_generate_key/1, dh_generate_key/2, dh_compute_key/3]).
-export([rand_bytes/1, rand_bytes/3, rand_uniform/2]).
-export([strong_rand_bytes/1, strong_rand_mpint/3]).
--export([mod_exp/3, mpint/1, erlint/1]).
+-export([mod_exp/3, mod_exp_prime/3, mpint/1, erlint/1]).
+-export([srp_value_B/5]).
+-export([srp3_value_u/1, srp6_value_u/3, srp6a_multiplier/2]).
+-export([srp_client_secret/7, srp_server_secret/5]).
+
%% -export([idea_cbc_encrypt/3, idea_cbc_decrypt/3]).
-export([aes_cbc_128_encrypt/3, aes_cbc_128_decrypt/3]).
-export([aes_cbc_256_encrypt/3, aes_cbc_256_decrypt/3]).
@@ -88,7 +92,7 @@
strong_rand_bytes,
strong_rand_mpint,
rand_uniform,
- mod_exp,
+ mod_exp, mod_exp_prime,
dss_verify,dss_sign,
rsa_verify,rsa_sign,
rsa_public_encrypt,rsa_private_decrypt,
@@ -109,6 +113,9 @@
hash, hash_init, hash_update, hash_final,
hmac, hmac_init, hmac_update, hmac_final, hmac_final_n, info,
rc2_cbc_encrypt, rc2_cbc_decrypt,
+ srp_value_B,
+ srp3_value_u, srp6_value_u, srp6a_multiplier,
+ srp_client_secret, srp_server_secret,
info_lib]).
-type rsa_digest_type() :: 'md5' | 'sha' | 'sha224' | 'sha256' | 'sha384' | 'sha512'.
@@ -783,7 +790,7 @@ rand_uniform_pos(_,_) ->
rand_uniform_nif(_From,_To) -> ?nif_stub.
%%
-%% mod_exp - utility for rsa generation
+%% mod_exp - utility for rsa generation and SRP
%%
mod_exp(Base, Exponent, Modulo)
when is_integer(Base), is_integer(Exponent), is_integer(Modulo) ->
@@ -792,6 +799,11 @@ mod_exp(Base, Exponent, Modulo)
mod_exp(Base, Exponent, Modulo) ->
mod_exp_nif(mpint_to_bin(Base),mpint_to_bin(Exponent),mpint_to_bin(Modulo), 4).
+-spec mod_exp_prime(binary(), binary(), binary()) -> binary().
+mod_exp_prime(Base, Exponent, Prime) ->
+ case mod_exp_nif(Base, Exponent, Prime, 0) of
+ <<0>> -> error;
+ R -> R
end.
@@ -1062,10 +1074,63 @@ dh_compute_key(OthersPublicKey, MyPrivateKey, DHParameters) ->
dh_compute_key_nif(_OthersPublicKey, _MyPrivateKey, _DHParameters) -> ?nif_stub.
+
+-spec srp_value_B(binary(), integer(), binary(), binary(), binary()) -> binary().
+srp_value_B(Multiplier, Verifier, Generator, Exponent, Prime) ->
+ srp_value_B_nif(srp_multiplier(Multiplier), Verifier, Generator, Exponent, Prime).
+
+srp_value_B_nif(_Multiplier, _Verifier, _Generator, _Exponent, _Prime) -> ?nif_stub.
+
+-spec srp_client_secret(binary(), binary(), binary(), integer()|binary(), binary(), binary(), binary()) -> binary().
+srp_client_secret(A, U, B, Multiplier, Generator, Exponent, Prime) ->
+ srp_client_secret_nif(A, U, B, srp_multiplier(Multiplier), Generator, Exponent, Prime).
+
+srp_client_secret_nif(_A, _U, _B, _Multiplier, _Generator, _Exponent, _Prime) -> ?nif_stub.
+
+-spec srp_server_secret(binary(), binary(), binary(), binary(), binary()) -> binary().
+srp_server_secret(_Verifier, _B, _U, _A, _Prime) -> ?nif_stub.
+
+-spec srp6a_multiplier(binary(), binary()) -> binary().
+srp6a_multiplier(Generator, Prime) ->
+ %% k = SHA1(N | PAD(g))
+ C0 = sha_init(),
+ C1 = sha_update(C0, Prime),
+ C2 = sha_update(C1, srp_pad_to(erlang:byte_size(Prime), Generator)),
+ sha_final(C2).
+
+-spec srp3_value_u(binary()) -> binary().
+srp3_value_u(B) ->
+ %% The parameter u is a 32-bit unsigned integer which takes its value
+ %% from the first 32 bits of the SHA1 hash of B, MSB first.
+ <<U:32/bits, _/binary>> = sha(B),
+ U.
+
+-spec srp6_value_u(binary(), binary(), binary()) -> binary().
+srp6_value_u(A, B, Prime) ->
+ %% SHA1(PAD(A) | PAD(B))
+ PadLength = erlang:byte_size(Prime),
+ C0 = sha_init(),
+ C1 = sha_update(C0, srp_pad_to(PadLength, A)),
+ C2 = sha_update(C1, srp_pad_to(PadLength, B)),
+ sha_final(C2).
+
%%
%% LOCAL FUNCTIONS
%%
+srp_pad_length(Width, Length) ->
+ (Width - Length rem Width) rem Width.
+
+srp_pad_to(Width, Binary) ->
+ case srp_pad_length(Width, size(Binary)) of
+ 0 -> Binary;
+ N -> << 0:(N*8), Binary/binary>>
+ end.
+
+srp_multiplier(Multiplier) when is_binary(Multiplier) ->
+ Multiplier;
+srp_multiplier(Multiplier) when is_integer(Multiplier) ->
+ int_to_bin_pos(Multiplier).
%% large integer in a binary with 32bit length
%% MP representaion (SSH2)