wbokslag has uploaded this change for review. ( https://gerrit.osmocom.org/c/osmo-tetra/+/41683?usp=email )
Change subject: Added TA61 to the TAA1 suite ......................................................................
Added TA61 to the TAA1 suite
Change-Id: I79e93d6863ab6c044a8e19bba85c7447095f5e11 --- M src/crypto/hurdle.c M src/crypto/hurdle.h M src/crypto/taa1.c M src/crypto/taa1.h 4 files changed, 149 insertions(+), 0 deletions(-)
git pull ssh://gerrit.osmocom.org:29418/osmo-tetra refs/changes/83/41683/1
diff --git a/src/crypto/hurdle.c b/src/crypto/hurdle.c index 58a1bb0..a7b1f8d 100644 --- a/src/crypto/hurdle.c +++ b/src/crypto/hurdle.c @@ -45,6 +45,24 @@ 0xF0, 0xE6, 0x3F, 0x14, 0xF1, 0xE2, 0xB1, 0x86, 0xB4, 0xF3, 0x74, 0xFA, 0x6A, 0xB2, 0x21, 0x6D, 0xEA, 0xB5, 0xE7, 0xE3, 0xC9, 0xD3, 0x8F, 0x03, 0x75, 0xE8, 0xD4, 0x42, 0xFD, 0x7E, 0xFF, 0x7F};
+const uint8_t g_abHurdleInvSbox[256] = { + 0x03, 0x02, 0x8D, 0xF7, 0x44, 0xA4, 0x79, 0xB9, 0xAE, 0x9E, 0xDE, 0x9B, 0x3E, 0xA9, 0x5E, 0x95, + 0xDB, 0x71, 0xC3, 0x5B, 0xE3, 0x3D, 0x4F, 0x65, 0x93, 0xDD, 0x56, 0x83, 0xA3, 0x80, 0x48, 0x29, + 0x6F, 0xEE, 0x3A, 0x52, 0x63, 0x55, 0x2F, 0x89, 0x73, 0xD3, 0x1C, 0x49, 0x25, 0x88, 0x30, 0x6D, + 0x4B, 0x8A, 0x6C, 0x2D, 0xA7, 0xC0, 0x43, 0x5D, 0x53, 0x21, 0xCC, 0xAA, 0xA8, 0x0F, 0x16, 0xE2, + 0x35, 0x5C, 0xFB, 0xD6, 0x91, 0x4D, 0xA5, 0x07, 0x33, 0x8B, 0x28, 0x1D, 0x15, 0x64, 0x46, 0x90, + 0x3B, 0x20, 0x6B, 0x8F, 0x82, 0x19, 0x26, 0x62, 0x10, 0xC2, 0xC8, 0x60, 0x94, 0x0D, 0x34, 0x42, + 0x27, 0x54, 0xCA, 0x58, 0xBA, 0x01, 0x14, 0x4E, 0x51, 0x8E, 0xEC, 0xB0, 0x23, 0xEF, 0x2C, 0x31, + 0x2B, 0xD2, 0x12, 0xDA, 0xEA, 0xF8, 0xD9, 0x7A, 0xD8, 0x74, 0x05, 0xB8, 0x87, 0xCE, 0xFD, 0xFF, + 0x18, 0x57, 0xA2, 0x1E, 0x7F, 0xCF, 0xE7, 0xB3, 0x4A, 0x32, 0x24, 0x2E, 0x50, 0x6A, 0xC7, 0xF6, + 0x1B, 0xDC, 0x47, 0x4C, 0x98, 0xBF, 0x0C, 0x5F, 0x08, 0xDF, 0xBE, 0x97, 0xAF, 0x0A, 0xC4, 0xA1, + 0x1F, 0x81, 0x9C, 0xC5, 0x37, 0xC1, 0x45, 0x06, 0xCD, 0x38, 0x0E, 0x3F, 0x9F, 0x0B, 0xBD, 0xB4, + 0x84, 0xE6, 0xED, 0x68, 0xE8, 0xF1, 0xBC, 0xAC, 0xC6, 0x67, 0x04, 0x78, 0x96, 0x99, 0xAD, 0xB5, + 0x11, 0x5A, 0xA6, 0x36, 0x66, 0xBB, 0xA0, 0x9D, 0xD1, 0xF4, 0x61, 0x59, 0x86, 0x7E, 0xAB, 0x39, + 0x2A, 0x72, 0xCB, 0xF5, 0xFA, 0x40, 0xD4, 0xD5, 0x13, 0x70, 0x75, 0x7B, 0x9A, 0x09, 0x1A, 0x92, + 0x17, 0x3C, 0xE5, 0xF3, 0x85, 0xB2, 0xE1, 0xF2, 0xF9, 0x77, 0xF0, 0xB7, 0x6E, 0x22, 0xB1, 0x69, + 0xE0, 0xE4, 0xB6, 0xE9, 0x00, 0x8C, 0xD0, 0xC9, 0x41, 0xD7, 0xEB, 0x76, 0x7C, 0xFC, 0x7D, 0xFE}; + #if __BYTE_ORDER == __LITTLE_ENDIAN static const uint32_t g_adwReorder[16] = { 0x00000000, 0x80000000, 0x00800000, 0x80800000, diff --git a/src/crypto/hurdle.h b/src/crypto/hurdle.h index bbd641c..123a5d3 100644 --- a/src/crypto/hurdle.h +++ b/src/crypto/hurdle.h @@ -16,5 +16,6 @@ void HURDLE_dec_cts(uint8_t abPlaintext[15], const uint8_t abCiphertext[15], uint8_t abKey[16]);
extern const uint8_t g_abHurdleSbox[256]; +extern const uint8_t g_abHurdleInvSbox[256];
#endif /* HAVE_HURDLE_H */ diff --git a/src/crypto/taa1.c b/src/crypto/taa1.c index 09e3a4b..71ff45d 100644 --- a/src/crypto/taa1.c +++ b/src/crypto/taa1.c @@ -127,6 +127,30 @@ lpBufferOut[9] = lpBuffer[13]; }
+void transform_identity(const uint8_t *lpInput, uint8_t *lpOutput) +{ + uint8_t abSboxIndexes[3]; + + abSboxIndexes[0] = ((lpInput[1] + lpInput[0]) << 1) - lpInput[2]; + abSboxIndexes[1] = ((lpInput[2] + lpInput[0]) << 1) - lpInput[1]; + abSboxIndexes[2] = ((lpInput[2] + lpInput[1]) << 1) - lpInput[0]; + + lpOutput[0] = g_abHurdleSbox[abSboxIndexes[0]]; + lpOutput[1] = g_abHurdleSbox[abSboxIndexes[1]]; + lpOutput[2] = g_abHurdleSbox[abSboxIndexes[2]]; +} + +void transform_identity_inverse(const uint8_t *lpInput, uint8_t *lpOutput) +{ + uint8_t x = g_abHurdleInvSbox[lpInput[0]]; + uint8_t y = g_abHurdleInvSbox[lpInput[1]]; + uint8_t z = g_abHurdleInvSbox[lpInput[2]]; + + lpOutput[0] = (114*x + 114*y - 57*z); + lpOutput[1] = (114*x - 57*y + 114*z); + lpOutput[2] = (-57*x + 114*y + 114*z); +} + void ta11_ta41(uint8_t *lpKeyK, uint8_t *lpChallengeRs, uint8_t *lpKsOut) { uint8_t abChallengeExpanded[16]; @@ -261,6 +285,103 @@ abUnsealed[10] & 0xe0; }
+void ta61_compute_c(const uint8_t *lpKey, uint8_t *lpIntermediateKeyOut) +{ + struct hurdle_ctx stCipher; + uint8_t abKeyExpanded[16]; + + transform_80_to_128(lpKey, abKeyExpanded); + + hurdle_set_key(abKeyExpanded, &stCipher); + + uint8_t abPlaintext[8]; + abPlaintext[0] = lpKey[0] ^ lpKey[2]; + abPlaintext[1] = lpKey[1] ^ lpKey[3]; + abPlaintext[2] = lpKey[2] ^ lpKey[4]; + abPlaintext[3] = lpKey[3] ^ lpKey[5]; + abPlaintext[4] = lpKey[4] ^ lpKey[6]; + abPlaintext[5] = lpKey[5] ^ lpKey[7]; + abPlaintext[6] = lpKey[6] ^ lpKey[8]; + abPlaintext[7] = lpKey[7] ^ lpKey[9]; + + HURDLE_encrypt( + lpIntermediateKeyOut, + abPlaintext, + &stCipher, + HURDLE_ENCRYPT + ); +} + +void ta61(const uint8_t *lpKey, const uint8_t *lpIdentity, uint8_t *lpEncIdentityOut) +{ + uint8_t abIntermediateKey[8]; + ta61_compute_c(lpKey, abIntermediateKey); + ta61_inner(abIntermediateKey, lpIdentity, lpEncIdentityOut); +} + +void ta61_inner(const uint8_t *lpIntermediateKey, const uint8_t *lpIdentity, uint8_t *lpEncIdentityOut) +{ + uint8_t abIdentity[3]; + abIdentity[0] = lpIdentity[0]; + abIdentity[1] = lpIdentity[1]; + abIdentity[2] = lpIdentity[2]; + + abIdentity[0] ^= lpIntermediateKey[0]; + abIdentity[1] ^= lpIntermediateKey[3]; + abIdentity[2] ^= lpIntermediateKey[6]; + + transform_identity(abIdentity, abIdentity); + + abIdentity[0] ^= lpIntermediateKey[1]; + abIdentity[1] ^= lpIntermediateKey[4]; + abIdentity[2] ^= lpIntermediateKey[7]; + + transform_identity(abIdentity, abIdentity); + + abIdentity[0] ^= lpIntermediateKey[2]; + abIdentity[1] ^= lpIntermediateKey[5]; + abIdentity[2] ^= lpIntermediateKey[0]; + + lpEncIdentityOut[0] = abIdentity[0]; + lpEncIdentityOut[1] = abIdentity[1]; + lpEncIdentityOut[2] = abIdentity[2]; +} + +void ta61_inv(uint8_t *lpKey, uint8_t *lpIdentity, uint8_t *lpDecIdentityOut) +{ + uint8_t abIntermediateKey[8]; + ta61_compute_c(lpKey, abIntermediateKey); + ta61_inner_inv(abIntermediateKey, lpIdentity, lpDecIdentityOut); +} + +void ta61_inner_inv(uint8_t *lpIntermediateKey, uint8_t *lpIdentity, uint8_t *lpDecIdentityOut) +{ + uint8_t abIdentity[3]; + abIdentity[0] = lpIdentity[0]; + abIdentity[1] = lpIdentity[1]; + abIdentity[2] = lpIdentity[2]; + + abIdentity[0] ^= lpIntermediateKey[2]; + abIdentity[1] ^= lpIntermediateKey[5]; + abIdentity[2] ^= lpIntermediateKey[0]; + + transform_identity_inverse(abIdentity, abIdentity); + + abIdentity[0] ^= lpIntermediateKey[1]; + abIdentity[1] ^= lpIntermediateKey[4]; + abIdentity[2] ^= lpIntermediateKey[7]; + + transform_identity_inverse(abIdentity, abIdentity); + + abIdentity[0] ^= lpIntermediateKey[0]; + abIdentity[1] ^= lpIntermediateKey[3]; + abIdentity[2] ^= lpIntermediateKey[6]; + + lpDecIdentityOut[0] = abIdentity[0]; + lpDecIdentityOut[1] = abIdentity[1]; + lpDecIdentityOut[2] = abIdentity[2]; +} + void ta71(uint8_t *lpGck, uint8_t *lpCck, uint8_t *lpMgckOut) { uint8_t abCiphertext[16]; diff --git a/src/crypto/taa1.h b/src/crypto/taa1.h index 4baff6e..84d287e 100644 --- a/src/crypto/taa1.h +++ b/src/crypto/taa1.h @@ -36,6 +36,8 @@ void ta32(uint8_t *lpSealedCck, uint8_t *lpCckId, uint8_t *lpDck, uint8_t *lpUnsealedCckOut, uint8_t *lpMfOut); void ta51(uint8_t *lpUnsealed, uint8_t *lpVn, uint8_t *lpKey, uint8_t *lpKeyN, uint8_t *lpSealedOut); void ta52(uint8_t *lpSealed, uint8_t *lpKey, uint8_t *lpVn, uint8_t *lpUnsealedOut, uint8_t *lpMfOut, uint8_t *lpKeyNOut); +void ta61(const uint8_t *lpKey, const uint8_t *lpIdentity, uint8_t *lpEncIdentityOut); +void ta61_inv(uint8_t *lpKey, uint8_t *lpIdentity, uint8_t *lpDecIdentityOut); void ta71(uint8_t *lpGck, uint8_t *lpCck, uint8_t *lpMgckOut); void ta81(uint8_t *lpUnsealedGck, uint8_t *lpGckVn, uint8_t *lpGckN, uint8_t *lpKey, uint8_t *lpSealedGckOut); void ta82(uint8_t *lpSealedGck, uint8_t *lpGckVn, uint8_t *lpKey, uint8_t *lpUnsealedGckOut, uint8_t *lpMfOut, uint8_t *lpGckNOut); @@ -43,6 +45,13 @@ void ta92(uint8_t *lpSealedGsko, uint8_t *lpGskoVn, uint8_t *lpKey, uint8_t *lpUnsealedGskoOut, uint8_t *lpMfOut);
/* + * TA61 internals + */ +void ta61_compute_c(const uint8_t *lpKey, uint8_t *lpIntermediateKeyOut); +void ta61_inner(const uint8_t *lpIntermediateKey, const uint8_t *lpIdentity, uint8_t *lpEncIdentityOut); +void ta61_inner_inv(uint8_t *lpIntermediateKey, uint8_t *lpIdentity, uint8_t *lpDecIdentityOut); + +/* * TBxx non-cryptographic primitives also used for authentication and key derivation */ void tb4(uint8_t *lpDck1, uint8_t *lpDck2, uint8_t *lpDckOut);