From e4d007e14f71259a673185ebaa316c92fcf53862 Mon Sep 17 00:00:00 2001 From: Denis Kenzior Date: Mon, 5 Jul 2021 18:29:31 -0500 Subject: [PATCH] unit: Add test for SAE Hash to Curve derivation --- unit/test-sae.c | 241 ++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 241 insertions(+) diff --git a/unit/test-sae.c b/unit/test-sae.c index 678c2526..e6fd2d7d 100644 --- a/unit/test-sae.c +++ b/unit/test-sae.c @@ -34,6 +34,7 @@ #include "src/mpdu.h" #include "src/sae.h" #include "src/auth-proto.h" +#include "src/crypto.h" struct test_handshake_state { struct handshake_state super; @@ -627,6 +628,244 @@ static void test_end_to_end(const void *arg) l_free(td2); } +static enum l_checksum_type ecc_hash_from_prime_len(size_t prime_len) +{ + if (prime_len <= 256 / 8) + return L_CHECKSUM_SHA256; + + if (prime_len <= 384 / 8) + return L_CHECKSUM_SHA384; + + return L_CHECKSUM_SHA512; +} + +static void test_pt_pwe(const void *data) +{ + static const char *ssid = "byteme"; + static const char *identifier = "psk4internet"; + static const char *password = "mekmitasdigoat"; + static const uint8_t mac1[] = { 0x00, 0x09, 0x5b, 0x66, 0xec, 0x1e }; + static const uint8_t mac2[] = { 0x00, 0x0b, 0x6b, 0xd9, 0x02, 0x46 }; + static const uint8_t prk[] = { + 0x3b, 0xd5, 0x3f, 0xe9, 0x22, 0x3d, 0xc0, 0x28, + 0x0f, 0xbf, 0xce, 0x17, 0xd7, 0xa3, 0x56, 0x40, + 0x64, 0xe2, 0x0f, 0x48, 0xc6, 0xec, 0x72, 0x24, + 0x6c, 0xe3, 0x67, 0xb5, 0x56, 0x9a, 0x22, 0xaf, + }; + static const uint8_t okm1[] = { + 0xa5, 0x04, 0x44, 0x69, 0xab, 0x16, 0xf2, 0x5b, + 0x6a, 0xbf, 0x1e, 0x0e, 0x37, 0xa3, 0x6b, 0x56, + 0xf5, 0x0b, 0xe7, 0x33, 0x69, 0x05, 0x3d, 0xf8, + 0xdb, 0x87, 0x98, 0x9a, 0x6b, 0x66, 0xfd, 0x1a, + 0x49, 0x1f, 0x1c, 0xda, 0xcb, 0xd0, 0x79, 0x31, + 0x62, 0x0f, 0x83, 0x00, 0x8f, 0xfc, 0x0e, 0xcc, + }; + static const uint8_t u1_data[] = { + 0xdc, 0x94, 0x1b, 0xc3, 0xc6, 0xa2, 0xb4, 0x94, + 0x8b, 0x6c, 0x61, 0xd5, 0x55, 0x90, 0xec, 0xb1, + 0xf0, 0xc5, 0x1c, 0x4b, 0x1b, 0xeb, 0xaf, 0xf6, + 0x77, 0xe5, 0x93, 0x69, 0x8d, 0x5a, 0x53, 0xc6, + }; + static const uint8_t okm2[] = { + 0x9b, 0x4e, 0x0d, 0x5b, 0x18, 0x79, 0xf2, 0x53, + 0xc5, 0x31, 0x96, 0x15, 0x09, 0x9b, 0x05, 0xae, + 0xc5, 0xb0, 0x6f, 0xa5, 0xe7, 0x88, 0xbc, 0xfd, + 0x1e, 0x9e, 0xa6, 0x0d, 0x33, 0x43, 0x69, 0x27, + 0x19, 0x08, 0x14, 0xc3, 0x22, 0xa6, 0x25, 0x85, + 0xc9, 0x3c, 0x57, 0x7b, 0xba, 0xa3, 0xd3, 0x07, + }; + static const uint8_t u2_data[] = { + 0x1b, 0x83, 0x75, 0xa5, 0x18, 0xbc, 0x21, 0x39, + 0x6a, 0xd6, 0xa6, 0x5e, 0x55, 0x97, 0xe0, 0xbf, + 0x80, 0xd7, 0x93, 0xb6, 0xd6, 0x6e, 0x25, 0x34, + 0xa6, 0xe7, 0xdf, 0xe3, 0xee, 0x22, 0x61, 0x6f, + }; + static const uint8_t p1x_data[] = { + 0xa0, 0x7c, 0x26, 0x07, 0x64, 0xa1, 0x34, 0x45, + 0xff, 0x8c, 0xd9, 0x7c, 0x5a, 0xcc, 0x64, 0x4e, + 0x71, 0x19, 0xbd, 0xe5, 0x1b, 0xad, 0x42, 0x58, + 0x3e, 0xed, 0x6f, 0x41, 0x09, 0x63, 0x9e, 0x6b, + }; + static const uint8_t p1y_data[] = { + 0x3b, 0xdc, 0x8d, 0xf0, 0xd3, 0x23, 0x37, 0x93, + 0x6c, 0x74, 0xdf, 0x60, 0x49, 0x33, 0xa4, 0x54, + 0x14, 0x22, 0x51, 0xc5, 0x3c, 0x57, 0x6c, 0x03, + 0x51, 0xb2, 0x8d, 0xea, 0xf9, 0x42, 0x8d, 0x7e, + }; + static const uint8_t p2x_data[] = { + 0x72, 0xcd, 0x2a, 0x96, 0x7a, 0x83, 0x7f, 0xea, + 0x50, 0x51, 0xf0, 0x13, 0x3d, 0xb4, 0x62, 0x27, + 0x77, 0x5b, 0xa0, 0x9f, 0x7b, 0x6d, 0xfb, 0x99, + 0xae, 0x7a, 0x8e, 0xf2, 0x2c, 0x7d, 0x34, 0xa0, + }; + static const uint8_t p2y_data[] = { + 0x86, 0x43, 0x90, 0xd7, 0x97, 0xd3, 0x52, 0xb3, + 0x68, 0xd3, 0x11, 0xaf, 0x51, 0x5b, 0xde, 0x11, + 0x6f, 0xe5, 0x44, 0x59, 0xfe, 0xc8, 0x67, 0xee, + 0x18, 0xa8, 0xa1, 0x61, 0x9c, 0xa3, 0xff, 0x59, + }; + static const uint8_t ptx_data[] = { + 0xb6, 0xe3, 0x8c, 0x98, 0x75, 0x0c, 0x68, 0x4b, + 0x5d, 0x17, 0xc3, 0xd8, 0xc9, 0xa4, 0x10, 0x0b, + 0x39, 0x93, 0x12, 0x79, 0x18, 0x7c, 0xa6, 0xcc, + 0xed, 0x5f, 0x37, 0xef, 0x46, 0xdd, 0xfa, 0x97, + }; + static const uint8_t pty_data[] = { + 0x56, 0x87, 0xe9, 0x72, 0xe5, 0x0f, 0x73, 0xe3, + 0x89, 0x88, 0x61, 0xe7, 0xed, 0xad, 0x21, 0xbe, + 0xa7, 0xd5, 0xf6, 0x22, 0xdf, 0x88, 0x24, 0x3b, + 0xb8, 0x04, 0x92, 0x0a, 0xe8, 0xe6, 0x47, 0xfa, + }; + static const uint8_t val_data[] = { + 0xbb, 0x7f, 0x9c, 0xac, 0x5a, 0xa8, 0xb7, 0x2c, + 0x02, 0xb5, 0xda, 0xac, 0xc2, 0x77, 0x1a, 0xbe, + 0x74, 0xe7, 0x26, 0x04, 0x61, 0x22, 0x95, 0xec, + 0xa2, 0xce, 0x18, 0x36, 0x3a, 0xe9, 0xa9, 0x27, + }; + static const uint8_t pwex_data[] = { + 0xc9, 0x30, 0x49, 0xb9, 0xe6, 0x40, 0x00, 0xf8, + 0x48, 0x20, 0x16, 0x49, 0xe9, 0x99, 0xf2, 0xb5, + 0xc2, 0x2d, 0xea, 0x69, 0xb5, 0x63, 0x2c, 0x9d, + 0xf4, 0xd6, 0x33, 0xb8, 0xaa, 0x1f, 0x6c, 0x1e, + }; + static const uint8_t pwey_data[] = { + 0x73, 0x63, 0x4e, 0x94, 0xb5, 0x3d, 0x82, 0xe7, + 0x38, 0x3a, 0x8d, 0x25, 0x81, 0x99, 0xd9, 0xdc, + 0x1a, 0x5e, 0xe8, 0x26, 0x9d, 0x06, 0x03, 0x82, + 0xcc, 0xbf, 0x33, 0xe6, 0x14, 0xff, 0x59, 0xa0, + }; + + const struct l_ecc_curve *curve; + struct l_ecc_scalar *u1; + struct l_ecc_scalar *u2; + struct l_ecc_scalar *val; + struct l_ecc_point *p1; + struct l_ecc_point *p2; + struct l_ecc_point *pt; + struct l_ecc_point *pwe; + enum l_checksum_type hash; + size_t hash_len; + uint8_t pwd_seed[64]; /* SHA512 is the biggest possible right now */ + uint8_t pwd_value[128]; + size_t pwd_value_len; + uint8_t ubuf[64]; + uint64_t num[L_ECC_MAX_DIGITS]; + uint8_t zero[64] = { 0 }; + uint8_t val_buf[32]; + uint8_t sorted_macs[12]; + + curve = l_ecc_curve_get_ike_group(19); + assert(curve); + + hash = ecc_hash_from_prime_len(l_ecc_curve_get_scalar_bytes(curve)); + hash_len = l_checksum_digest_length(hash); + + assert(hash_len == 32); + + /* pwd-seed = HKDF-Extract(ssid, password [|| identifier]) */ + assert(hkdf_extract(hash, ssid, strlen(ssid), 2, pwd_seed, + password, strlen(password), + identifier, strlen(identifier))); + assert(!memcmp(pwd_seed, prk, sizeof(prk))); + + /* len = olen(p) + floor(olen(p)/2) */ + pwd_value_len = l_ecc_curve_get_scalar_bytes(curve); + pwd_value_len += pwd_value_len / 2; + + /* + * pwd-value = HKDF-Expand(pwd-seed, "SAE Hash to Element u1 P1", len) + */ + assert(hkdf_expand(hash, pwd_seed, hash_len, + "SAE Hash to Element u1 P1", + pwd_value, pwd_value_len)); + assert(!memcmp(pwd_value, okm1, sizeof(okm1))); + + u1 = l_ecc_scalar_new_modp(curve, pwd_value, pwd_value_len); + assert(u1); + + assert(l_ecc_scalar_get_data(u1, ubuf, sizeof(ubuf)) == + (ssize_t) sizeof(u1_data)); + assert(!memcmp(ubuf, u1_data, sizeof(u1_data))); + + /* + * pwd-value = HKDF-Expand(pwd-seed, "SAE Hash to Element u2 P2", len) + */ + assert(hkdf_expand(hash, pwd_seed, hash_len, + "SAE Hash to Element u2 P2", + pwd_value, pwd_value_len)); + assert(!memcmp(pwd_value, okm2, sizeof(okm2))); + + u2 = l_ecc_scalar_new_modp(curve, pwd_value, pwd_value_len); + assert(u2); + + assert(l_ecc_scalar_get_data(u2, ubuf, sizeof(ubuf)) == + (ssize_t) sizeof(u2_data)); + assert(!memcmp(ubuf, u2_data, sizeof(u2_data))); + + p1 = l_ecc_point_from_sswu(u1); + assert(p1); + + assert(l_ecc_point_get_x(p1, num, sizeof(num)) > 0); + assert(!memcmp(num, p1x_data, sizeof(p1x_data))); + + assert(l_ecc_point_get_y(p1, num, sizeof(num)) > 0); + assert(!memcmp(num, p1y_data, sizeof(p1y_data))); + + p2 = l_ecc_point_from_sswu(u2); + assert(p2); + + assert(l_ecc_point_get_x(p2, num, sizeof(num)) > 0); + assert(!memcmp(num, p2x_data, sizeof(p2x_data))); + + assert(l_ecc_point_get_y(p2, num, sizeof(num)) > 0); + assert(!memcmp(num, p2y_data, sizeof(p2y_data))); + + pt = l_ecc_point_new(curve); + assert(pt); + assert(l_ecc_point_add(pt, p1, p2)); + + assert(l_ecc_point_get_x(pt, num, sizeof(num)) > 0); + assert(!memcmp(num, ptx_data, sizeof(ptx_data))); + + assert(l_ecc_point_get_y(pt, num, sizeof(num)) > 0); + assert(!memcmp(num, pty_data, sizeof(pty_data))); + + l_ecc_point_free(p1); + l_ecc_point_free(p2); + l_ecc_scalar_free(u1); + l_ecc_scalar_free(u2); + + if (memcmp(mac1, mac2, 6) > 0) { + memcpy(sorted_macs, mac1, 6); + memcpy(sorted_macs + 6, mac2, 6); + } else { + memcpy(sorted_macs, mac2, 6); + memcpy(sorted_macs + 6, mac1, 6); + } + + assert(hkdf_extract(hash, zero, hash_len, 1, val_buf, + sorted_macs, sizeof(sorted_macs))); + val = l_ecc_scalar_new_reduced_1_to_n(curve, val_buf, sizeof(val_buf)); + assert(val); + assert(l_ecc_scalar_get_data(val, ubuf, sizeof(ubuf)) == + (ssize_t) sizeof(val_data)); + assert(!memcmp(ubuf, val_data, sizeof(val_data))); + + pwe = l_ecc_point_new(curve); + assert(pwe); + assert(l_ecc_point_multiply(pwe, val, pt)); + + assert(l_ecc_point_get_x(pwe, num, sizeof(num)) > 0); + assert(!memcmp(num, pwex_data, sizeof(pwex_data))); + + assert(l_ecc_point_get_y(pwe, num, sizeof(num)) > 0); + assert(!memcmp(num, pwey_data, sizeof(pwey_data))); + + l_ecc_point_free(pt); + l_ecc_scalar_free(val); + l_ecc_point_free(pwe); +} + int main(int argc, char *argv[]) { l_test_init(&argc, &argv); @@ -651,6 +890,8 @@ int main(int argc, char *argv[]) l_test_add("SAE confirm after accept", test_confirm_after_accept, NULL); l_test_add("SAE end-to-end", test_end_to_end, NULL); + l_test_add("SAE pt-pwe", test_pt_pwe, NULL); + done: return l_test_run(); }