est31/csrp-gmp
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This commit is contained in:
Tom Cocagne 2010-10-01 15:11:00 -04:00
parent 7ec0c6c2ae
commit 5a52bcb31e
1 changed files with 32 additions and 32 deletions
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64
srp.c
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@ -271,15 +271,15 @@ void srp_gen_sv( const char * username,
const unsigned char ** bytes_v, int * len_v ) const unsigned char ** bytes_v, int * len_v )
{ {
BIGNUM * s = BN_new(); BIGNUM * s = BN_new();
BIGNUM * v = BN_new(); BIGNUM * v = BN_new();
BIGNUM * x = 0; BIGNUM * x = 0;
BN_CTX *ctx = BN_CTX_new(); BN_CTX *ctx = BN_CTX_new();
BN_rand(s, 32, -1, 0); BN_rand(s, 32, -1, 0);
x = calculate_x( s, username, password, len_password ); x = calculate_x( s, username, password, len_password );
BN_mod_exp(v, g, x, N, ctx); BN_mod_exp(v, g, x, N, ctx);
*len_s = BN_num_bytes(s); *len_s = BN_num_bytes(s);
*len_v = BN_num_bytes(v); *len_v = BN_num_bytes(v);
@ -327,37 +327,37 @@ struct SRPVerifier * srp_verifier_new( const char * username,
memcpy( (char*)ver->username, username, ulen ); memcpy( (char*)ver->username, username, ulen );
ver->authenticated = 0; ver->authenticated = 0;
/* SRP-6a safety check */ /* SRP-6a safety check */
BN_mod(tmp1, A, N, ctx); BN_mod(tmp1, A, N, ctx);
if ( !BN_is_zero(tmp1) ) if ( !BN_is_zero(tmp1) )
{ {
BN_rand(b, 256, -1, 0); BN_rand(b, 256, -1, 0);
/* B = kv + g^b */ /* B = kv + g^b */
BN_mul(tmp1, k, v, ctx); BN_mul(tmp1, k, v, ctx);
BN_mod_exp(tmp2, g, b, N, ctx); BN_mod_exp(tmp2, g, b, N, ctx);
BN_add(B, tmp1, tmp2); BN_add(B, tmp1, tmp2);
u = H_nn(A,B); u = H_nn(A,B);
/* S = (A *(v^u)) ^ b */ /* S = (A *(v^u)) ^ b */
BN_mod_exp(tmp1, v, u, N, ctx); BN_mod_exp(tmp1, v, u, N, ctx);
BN_mul(tmp2, A, tmp1, ctx); BN_mul(tmp2, A, tmp1, ctx);
BN_mod_exp(S, tmp2, b, N, ctx); BN_mod_exp(S, tmp2, b, N, ctx);
hash_num(S, ver->session_key); hash_num(S, ver->session_key);
calculate_M( ver->M, username, s, A, B, ver->session_key ); calculate_M( ver->M, username, s, A, B, ver->session_key );
calculate_H_AMK( ver->H_AMK, A, ver->M, ver->session_key ); calculate_H_AMK( ver->H_AMK, A, ver->M, ver->session_key );
*len_B = BN_num_bytes(B); *len_B = BN_num_bytes(B);
*bytes_B = malloc( *len_B ); *bytes_B = malloc( *len_B );
BN_bn2bin( B, (unsigned char *) *bytes_B ); BN_bn2bin( B, (unsigned char *) *bytes_B );
ver->bytes_B = *bytes_B; ver->bytes_B = *bytes_B;
} }
else else
{ {
*len_B = 0; *len_B = 0;
@ -441,7 +441,7 @@ struct SRPUser * srp_user_new( const char * username,
memcpy((char *)usr->password, bytes_password, len_password); memcpy((char *)usr->password, bytes_password, len_password);
usr->bytes_A = 0; usr->bytes_A = 0;
return usr; return usr;
} }
@ -490,9 +490,9 @@ void srp_user_start_authentication( struct SRPUser * usr, const char ** usernam
BN_CTX *ctx = BN_CTX_new(); BN_CTX *ctx = BN_CTX_new();
BN_rand(usr->a, 256, -1, 0); BN_rand(usr->a, 256, -1, 0);
BN_mod_exp(usr->A, g, usr->a, N, ctx); BN_mod_exp(usr->A, g, usr->a, N, ctx);
BN_CTX_free(ctx); BN_CTX_free(ctx);
*len_A = BN_num_bytes(usr->A); *len_A = BN_num_bytes(usr->A);