diff options
| -rw-r--r-- | lib/lib5.c | 14 | ||||
| -rw-r--r-- | lib/lib5.h | 1 | ||||
| -rw-r--r-- | set5/task37.c | 37 |
3 files changed, 52 insertions, 0 deletions
@@ -265,6 +265,20 @@ void srp_compute_uH(struct srp_context *srpc) BN_bin2bn(uH, 20, srpc->u); } +void srp_client_s_0_prepare_k(struct srp_context *srpc) +{ + SHA1Context sha1; + BIGNUM *S = BN_new(); + BN_zero(S); + + char *s_str = malloc(BN_num_bytes(S)); + BN_bn2bin(S, s_str); + SHA1Reset(&sha1); + SHA1Input(&sha1, s_str, BN_num_bytes(S)); + SHA1Result(&sha1); + memcpy(srpc->client_K, &(sha1.Message_Digest), 20); +} + void srp_client_prepare_k(struct srp_context *srpc, char *password) { SHA1Context sha1; @@ -116,4 +116,5 @@ void srp_compute_uH(struct srp_context *srpc); void srp_client_prepare_k(struct srp_context *srpc, char *password); void srp_server_prepare_k(struct srp_context *srpc); void srp_context_init(struct srp_context *s); +void srp_client_s_0_prepare_k(struct srp_context *srpc); #endif diff --git a/set5/task37.c b/set5/task37.c new file mode 100644 index 0000000..ccfc66f --- /dev/null +++ b/set5/task37.c @@ -0,0 +1,37 @@ +#include "../lib/lib.h" +#include "../lib/lib2.h" +#include "../lib/lib3.h" +#include "../lib/lib4.h" +#include "../lib/lib5.h" +#include <time.h> + +int main() +{ + struct srp_context srpc; + char *email = "test@example.com"; + char *password = "adfasdkfjh"; + char sK[41]; + char cK[41]; + out = BIO_new(BIO_s_file()); + BIO_set_fp(out, stdout, BIO_NOCLOSE); + + ctx = BN_CTX_new(); + + srp_context_init(&srpc); + srp_server_init(email, password, &srpc); + srp_client_send1(email, &srpc); + /** setting A to zero or kN yields to a zero S whatever the password is + * So we can set S also to 0 to get the same session key as the server + **/ + BN_zero(srpc.A); + BN_copy(srpc.A, srpc.N); + srp_server_send1(&srpc); + srp_compute_uH(&srpc); + srp_client_s_0_prepare_k(&srpc); + srp_server_prepare_k(&srpc); + // set client session key also to 0 + hex_binary_to_string(srpc.client_K, cK, 20); + hex_binary_to_string(srpc.server_K, sK, 20); + printf("cK: %s\n", cK); + printf("sK: %s\n", sK); +} |