/* This Source Code Form is subject to the terms of the Mozilla Public * License, v. 2.0. If a copy of the MPL was not distributed with this * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ #ifdef FREEBL_NO_DEPEND #include "stubs.h" #endif #include "prinit.h" #include "prenv.h" #include "prerr.h" #include "secerr.h" #include "prtypes.h" #include "blapi.h" #include "rijndael.h" #include "cts.h" #include "ctr.h" #include "gcm.h" #include "mpi.h" #if !defined(IS_LITTLE_ENDIAN) && !defined(NSS_X86_OR_X64) // not test yet on big endian platform of arm #undef USE_HW_AES #endif #ifdef USE_HW_AES #ifdef NSS_X86_OR_X64 #include "intel-aes.h" #else #include "aes-armv8.h" #endif #endif /* USE_HW_AES */ #ifdef INTEL_GCM #include "intel-gcm.h" #endif /* INTEL_GCM */ /* Forward declarations */ void rijndael_native_key_expansion(AESContext *cx, const unsigned char *key, unsigned int Nk); void rijndael_native_encryptBlock(AESContext *cx, unsigned char *output, const unsigned char *input); void rijndael_native_decryptBlock(AESContext *cx, unsigned char *output, const unsigned char *input); void native_xorBlock(unsigned char *out, const unsigned char *a, const unsigned char *b); /* Stub definitions for the above rijndael_native_* functions, which * shouldn't be used unless NSS_X86_OR_X64 is defined */ #ifndef NSS_X86_OR_X64 void rijndael_native_key_expansion(AESContext *cx, const unsigned char *key, unsigned int Nk) { PORT_SetError(SEC_ERROR_LIBRARY_FAILURE); PORT_Assert(0); } void rijndael_native_encryptBlock(AESContext *cx, unsigned char *output, const unsigned char *input) { PORT_SetError(SEC_ERROR_LIBRARY_FAILURE); PORT_Assert(0); } void rijndael_native_decryptBlock(AESContext *cx, unsigned char *output, const unsigned char *input) { PORT_SetError(SEC_ERROR_LIBRARY_FAILURE); PORT_Assert(0); } void native_xorBlock(unsigned char *out, const unsigned char *a, const unsigned char *b) { PORT_SetError(SEC_ERROR_LIBRARY_FAILURE); PORT_Assert(0); } #endif /* NSS_X86_OR_X64 */ /* * There are currently three ways to build this code, varying in performance * and code size. * * RIJNDAEL_INCLUDE_TABLES Include all tables from rijndael32.tab * RIJNDAEL_GENERATE_VALUES Do not store tables, generate the table * values "on-the-fly", using gfm * RIJNDAEL_GENERATE_VALUES_MACRO Same as above, but use macros * * The default is RIJNDAEL_INCLUDE_TABLES. */ /* * When building RIJNDAEL_INCLUDE_TABLES, includes S**-1, Rcon, T[0..4], * T**-1[0..4], IMXC[0..4] * When building anything else, includes S, S**-1, Rcon */ #include "rijndael32.tab" #if defined(RIJNDAEL_INCLUDE_TABLES) /* * RIJNDAEL_INCLUDE_TABLES */ #define T0(i) _T0[i] #define T1(i) _T1[i] #define T2(i) _T2[i] #define T3(i) _T3[i] #define TInv0(i) _TInv0[i] #define TInv1(i) _TInv1[i] #define TInv2(i) _TInv2[i] #define TInv3(i) _TInv3[i] #define IMXC0(b) _IMXC0[b] #define IMXC1(b) _IMXC1[b] #define IMXC2(b) _IMXC2[b] #define IMXC3(b) _IMXC3[b] /* The S-box can be recovered from the T-tables */ #ifdef IS_LITTLE_ENDIAN #define SBOX(b) ((PRUint8)_T3[b]) #else #define SBOX(b) ((PRUint8)_T1[b]) #endif #define SINV(b) (_SInv[b]) #else /* not RIJNDAEL_INCLUDE_TABLES */ /* * Code for generating T-table values. */ #ifdef IS_LITTLE_ENDIAN #define WORD4(b0, b1, b2, b3) \ ((((PRUint32)b3) << 24) | \ (((PRUint32)b2) << 16) | \ (((PRUint32)b1) << 8) | \ ((PRUint32)b0)) #else #define WORD4(b0, b1, b2, b3) \ ((((PRUint32)b0) << 24) | \ (((PRUint32)b1) << 16) | \ (((PRUint32)b2) << 8) | \ ((PRUint32)b3)) #endif /* * Define the S and S**-1 tables (both have been stored) */ #define SBOX(b) (_S[b]) #define SINV(b) (_SInv[b]) /* * The function xtime, used for Galois field multiplication */ #define XTIME(a) \ ((a & 0x80) ? ((a << 1) ^ 0x1b) : (a << 1)) /* Choose GFM method (macros or function) */ #if defined(RIJNDAEL_GENERATE_VALUES_MACRO) /* * Galois field GF(2**8) multipliers, in macro form */ #define GFM01(a) \ (a) /* a * 01 = a, the identity */ #define GFM02(a) \ (XTIME(a) & 0xff) /* a * 02 = xtime(a) */ #define GFM04(a) \ (GFM02(GFM02(a))) /* a * 04 = xtime**2(a) */ #define GFM08(a) \ (GFM02(GFM04(a))) /* a * 08 = xtime**3(a) */ #define GFM03(a) \ (GFM01(a) ^ GFM02(a)) /* a * 03 = a * (01 + 02) */ #define GFM09(a) \ (GFM01(a) ^ GFM08(a)) /* a * 09 = a * (01 + 08) */ #define GFM0B(a) \ (GFM01(a) ^ GFM02(a) ^ GFM08(a)) /* a * 0B = a * (01 + 02 + 08) */ #define GFM0D(a) \ (GFM01(a) ^ GFM04(a) ^ GFM08(a)) /* a * 0D = a * (01 + 04 + 08) */ #define GFM0E(a) \ (GFM02(a) ^ GFM04(a) ^ GFM08(a)) /* a * 0E = a * (02 + 04 + 08) */ #else /* RIJNDAEL_GENERATE_VALUES */ /* GF_MULTIPLY * * multiply two bytes represented in GF(2**8), mod (x**4 + 1) */ PRUint8 gfm(PRUint8 a, PRUint8 b) { PRUint8 res = 0; while (b > 0) { res = (b & 0x01) ? res ^ a : res; a = XTIME(a); b >>= 1; } return res; } #define GFM01(a) \ (a) /* a * 01 = a, the identity */ #define GFM02(a) \ (XTIME(a) & 0xff) /* a * 02 = xtime(a) */ #define GFM03(a) \ (gfm(a, 0x03)) /* a * 03 */ #define GFM09(a) \ (gfm(a, 0x09)) /* a * 09 */ #define GFM0B(a) \ (gfm(a, 0x0B)) /* a * 0B */ #define GFM0D(a) \ (gfm(a, 0x0D)) /* a * 0D */ #define GFM0E(a) \ (gfm(a, 0x0E)) /* a * 0E */ #endif /* choosing GFM function */ /* * The T-tables */ #define G_T0(i) \ (WORD4(GFM02(SBOX(i)), GFM01(SBOX(i)), GFM01(SBOX(i)), GFM03(SBOX(i)))) #define G_T1(i) \ (WORD4(GFM03(SBOX(i)), GFM02(SBOX(i)), GFM01(SBOX(i)), GFM01(SBOX(i)))) #define G_T2(i) \ (WORD4(GFM01(SBOX(i)), GFM03(SBOX(i)), GFM02(SBOX(i)), GFM01(SBOX(i)))) #define G_T3(i) \ (WORD4(GFM01(SBOX(i)), GFM01(SBOX(i)), GFM03(SBOX(i)), GFM02(SBOX(i)))) /* * The inverse T-tables */ #define G_TInv0(i) \ (WORD4(GFM0E(SINV(i)), GFM09(SINV(i)), GFM0D(SINV(i)), GFM0B(SINV(i)))) #define G_TInv1(i) \ (WORD4(GFM0B(SINV(i)), GFM0E(SINV(i)), GFM09(SINV(i)), GFM0D(SINV(i)))) #define G_TInv2(i) \ (WORD4(GFM0D(SINV(i)), GFM0B(SINV(i)), GFM0E(SINV(i)), GFM09(SINV(i)))) #define G_TInv3(i) \ (WORD4(GFM09(SINV(i)), GFM0D(SINV(i)), GFM0B(SINV(i)), GFM0E(SINV(i)))) /* * The inverse mix column tables */ #define G_IMXC0(i) \ (WORD4(GFM0E(i), GFM09(i), GFM0D(i), GFM0B(i))) #define G_IMXC1(i) \ (WORD4(GFM0B(i), GFM0E(i), GFM09(i), GFM0D(i))) #define G_IMXC2(i) \ (WORD4(GFM0D(i), GFM0B(i), GFM0E(i), GFM09(i))) #define G_IMXC3(i) \ (WORD4(GFM09(i), GFM0D(i), GFM0B(i), GFM0E(i))) /* Now choose the T-table indexing method */ #if defined(RIJNDAEL_GENERATE_VALUES) /* generate values for the tables with a function*/ static PRUint32 gen_TInvXi(PRUint8 tx, PRUint8 i) { PRUint8 si01, si02, si03, si04, si08, si09, si0B, si0D, si0E; si01 = SINV(i); si02 = XTIME(si01); si04 = XTIME(si02); si08 = XTIME(si04); si03 = si02 ^ si01; si09 = si08 ^ si01; si0B = si08 ^ si03; si0D = si09 ^ si04; si0E = si08 ^ si04 ^ si02; switch (tx) { case 0: return WORD4(si0E, si09, si0D, si0B); case 1: return WORD4(si0B, si0E, si09, si0D); case 2: return WORD4(si0D, si0B, si0E, si09); case 3: return WORD4(si09, si0D, si0B, si0E); } return -1; } #define T0(i) G_T0(i) #define T1(i) G_T1(i) #define T2(i) G_T2(i) #define T3(i) G_T3(i) #define TInv0(i) gen_TInvXi(0, i) #define TInv1(i) gen_TInvXi(1, i) #define TInv2(i) gen_TInvXi(2, i) #define TInv3(i) gen_TInvXi(3, i) #define IMXC0(b) G_IMXC0(b) #define IMXC1(b) G_IMXC1(b) #define IMXC2(b) G_IMXC2(b) #define IMXC3(b) G_IMXC3(b) #else /* RIJNDAEL_GENERATE_VALUES_MACRO */ /* generate values for the tables with macros */ #define T0(i) G_T0(i) #define T1(i) G_T1(i) #define T2(i) G_T2(i) #define T3(i) G_T3(i) #define TInv0(i) G_TInv0(i) #define TInv1(i) G_TInv1(i) #define TInv2(i) G_TInv2(i) #define TInv3(i) G_TInv3(i) #define IMXC0(b) G_IMXC0(b) #define IMXC1(b) G_IMXC1(b) #define IMXC2(b) G_IMXC2(b) #define IMXC3(b) G_IMXC3(b) #endif /* choose T-table indexing method */ #endif /* not RIJNDAEL_INCLUDE_TABLES */ /************************************************************************** * * Stuff related to the Rijndael key schedule * *************************************************************************/ #define SUBBYTE(w) \ ((((PRUint32)SBOX((w >> 24) & 0xff)) << 24) | \ (((PRUint32)SBOX((w >> 16) & 0xff)) << 16) | \ (((PRUint32)SBOX((w >> 8) & 0xff)) << 8) | \ (((PRUint32)SBOX((w)&0xff)))) #ifdef IS_LITTLE_ENDIAN #define ROTBYTE(b) \ ((b >> 8) | (b << 24)) #else #define ROTBYTE(b) \ ((b << 8) | (b >> 24)) #endif /* rijndael_key_expansion7 * * Generate the expanded key from the key input by the user. * XXX * Nk == 7 (224 key bits) is a weird case. Since Nk > 6, an added SubByte * transformation is done periodically. The period is every 4 bytes, and * since 7%4 != 0 this happens at different times for each key word (unlike * Nk == 8 where it happens twice in every key word, in the same positions). * For now, I'm implementing this case "dumbly", w/o any unrolling. */ static void rijndael_key_expansion7(AESContext *cx, const unsigned char *key, unsigned int Nk) { unsigned int i; PRUint32 *W; PRUint32 *pW; PRUint32 tmp; W = cx->k.expandedKey; /* 1. the first Nk words contain the cipher key */ memcpy(W, key, Nk * 4); i = Nk; /* 2. loop until full expanded key is obtained */ pW = W + i - 1; for (; i < cx->Nb * (cx->Nr + 1); ++i) { tmp = *pW++; if (i % Nk == 0) tmp = SUBBYTE(ROTBYTE(tmp)) ^ Rcon[i / Nk - 1]; else if (i % Nk == 4) tmp = SUBBYTE(tmp); *pW = W[i - Nk] ^ tmp; } } /* rijndael_key_expansion * * Generate the expanded key from the key input by the user. */ static void rijndael_key_expansion(AESContext *cx, const unsigned char *key, unsigned int Nk) { unsigned int i; PRUint32 *W; PRUint32 *pW; PRUint32 tmp; unsigned int round_key_words = cx->Nb * (cx->Nr + 1); if (Nk == 7) { rijndael_key_expansion7(cx, key, Nk); return; } W = cx->k.expandedKey; /* The first Nk words contain the input cipher key */ memcpy(W, key, Nk * 4); i = Nk; pW = W + i - 1; /* Loop over all sets of Nk words, except the last */ while (i < round_key_words - Nk) { tmp = *pW++; tmp = SUBBYTE(ROTBYTE(tmp)) ^ Rcon[i / Nk - 1]; *pW = W[i++ - Nk] ^ tmp; tmp = *pW++; *pW = W[i++ - Nk] ^ tmp; tmp = *pW++; *pW = W[i++ - Nk] ^ tmp; tmp = *pW++; *pW = W[i++ - Nk] ^ tmp; if (Nk == 4) continue; switch (Nk) { case 8: tmp = *pW++; tmp = SUBBYTE(tmp); *pW = W[i++ - Nk] ^ tmp; case 7: tmp = *pW++; *pW = W[i++ - Nk] ^ tmp; case 6: tmp = *pW++; *pW = W[i++ - Nk] ^ tmp; case 5: tmp = *pW++; *pW = W[i++ - Nk] ^ tmp; } } /* Generate the last word */ tmp = *pW++; tmp = SUBBYTE(ROTBYTE(tmp)) ^ Rcon[i / Nk - 1]; *pW = W[i++ - Nk] ^ tmp; /* There may be overflow here, if Nk % (Nb * (Nr + 1)) > 0. However, * since the above loop generated all but the last Nk key words, there * is no more need for the SubByte transformation. */ if (Nk < 8) { for (; i < round_key_words; ++i) { tmp = *pW++; *pW = W[i - Nk] ^ tmp; } } else { /* except in the case when Nk == 8. Then one more SubByte may have * to be performed, at i % Nk == 4. */ for (; i < round_key_words; ++i) { tmp = *pW++; if (i % Nk == 4) tmp = SUBBYTE(tmp); *pW = W[i - Nk] ^ tmp; } } } /* rijndael_invkey_expansion * * Generate the expanded key for the inverse cipher from the key input by * the user. */ static void rijndael_invkey_expansion(AESContext *cx, const unsigned char *key, unsigned int Nk) { unsigned int r; PRUint32 *roundkeyw; PRUint8 *b; int Nb = cx->Nb; /* begins like usual key expansion ... */ rijndael_key_expansion(cx, key, Nk); /* ... but has the additional step of InvMixColumn, * excepting the first and last round keys. */ roundkeyw = cx->k.expandedKey + cx->Nb; for (r = 1; r < cx->Nr; ++r) { /* each key word, roundkeyw, represents a column in the key * matrix. Each column is multiplied by the InvMixColumn matrix. * [ 0E 0B 0D 09 ] [ b0 ] * [ 09 0E 0B 0D ] * [ b1 ] * [ 0D 09 0E 0B ] [ b2 ] * [ 0B 0D 09 0E ] [ b3 ] */ b = (PRUint8 *)roundkeyw; *roundkeyw++ = IMXC0(b[0]) ^ IMXC1(b[1]) ^ IMXC2(b[2]) ^ IMXC3(b[3]); b = (PRUint8 *)roundkeyw; *roundkeyw++ = IMXC0(b[0]) ^ IMXC1(b[1]) ^ IMXC2(b[2]) ^ IMXC3(b[3]); b = (PRUint8 *)roundkeyw; *roundkeyw++ = IMXC0(b[0]) ^ IMXC1(b[1]) ^ IMXC2(b[2]) ^ IMXC3(b[3]); b = (PRUint8 *)roundkeyw; *roundkeyw++ = IMXC0(b[0]) ^ IMXC1(b[1]) ^ IMXC2(b[2]) ^ IMXC3(b[3]); if (Nb <= 4) continue; switch (Nb) { case 8: b = (PRUint8 *)roundkeyw; *roundkeyw++ = IMXC0(b[0]) ^ IMXC1(b[1]) ^ IMXC2(b[2]) ^ IMXC3(b[3]); case 7: b = (PRUint8 *)roundkeyw; *roundkeyw++ = IMXC0(b[0]) ^ IMXC1(b[1]) ^ IMXC2(b[2]) ^ IMXC3(b[3]); case 6: b = (PRUint8 *)roundkeyw; *roundkeyw++ = IMXC0(b[0]) ^ IMXC1(b[1]) ^ IMXC2(b[2]) ^ IMXC3(b[3]); case 5: b = (PRUint8 *)roundkeyw; *roundkeyw++ = IMXC0(b[0]) ^ IMXC1(b[1]) ^ IMXC2(b[2]) ^ IMXC3(b[3]); } } } /************************************************************************** * * Stuff related to Rijndael encryption/decryption. * *************************************************************************/ #ifdef IS_LITTLE_ENDIAN #define BYTE0WORD(w) ((w)&0x000000ff) #define BYTE1WORD(w) ((w)&0x0000ff00) #define BYTE2WORD(w) ((w)&0x00ff0000) #define BYTE3WORD(w) ((w)&0xff000000) #else #define BYTE0WORD(w) ((w)&0xff000000) #define BYTE1WORD(w) ((w)&0x00ff0000) #define BYTE2WORD(w) ((w)&0x0000ff00) #define BYTE3WORD(w) ((w)&0x000000ff) #endif typedef union { PRUint32 w[4]; PRUint8 b[16]; } rijndael_state; #define COLUMN_0(state) state.w[0] #define COLUMN_1(state) state.w[1] #define COLUMN_2(state) state.w[2] #define COLUMN_3(state) state.w[3] #define STATE_BYTE(i) state.b[i] // out = a ^ b inline static void xorBlock(unsigned char *out, const unsigned char *a, const unsigned char *b) { for (unsigned int j = 0; j < AES_BLOCK_SIZE; ++j) { (out)[j] = (a)[j] ^ (b)[j]; } } static void NO_SANITIZE_ALIGNMENT rijndael_encryptBlock128(AESContext *cx, unsigned char *output, const unsigned char *input) { unsigned int r; PRUint32 *roundkeyw; rijndael_state state; PRUint32 C0, C1, C2, C3; #if defined(NSS_X86_OR_X64) #define pIn input #define pOut output #else unsigned char *pIn, *pOut; PRUint32 inBuf[4], outBuf[4]; if ((ptrdiff_t)input & 0x3) { memcpy(inBuf, input, sizeof inBuf); pIn = (unsigned char *)inBuf; } else { pIn = (unsigned char *)input; } if ((ptrdiff_t)output & 0x3) { pOut = (unsigned char *)outBuf; } else { pOut = (unsigned char *)output; } #endif roundkeyw = cx->k.expandedKey; /* Step 1: Add Round Key 0 to initial state */ COLUMN_0(state) = *((PRUint32 *)(pIn)) ^ *roundkeyw++; COLUMN_1(state) = *((PRUint32 *)(pIn + 4)) ^ *roundkeyw++; COLUMN_2(state) = *((PRUint32 *)(pIn + 8)) ^ *roundkeyw++; COLUMN_3(state) = *((PRUint32 *)(pIn + 12)) ^ *roundkeyw++; /* Step 2: Loop over rounds [1..NR-1] */ for (r = 1; r < cx->Nr; ++r) { /* Do ShiftRow, ByteSub, and MixColumn all at once */ C0 = T0(STATE_BYTE(0)) ^ T1(STATE_BYTE(5)) ^ T2(STATE_BYTE(10)) ^ T3(STATE_BYTE(15)); C1 = T0(STATE_BYTE(4)) ^ T1(STATE_BYTE(9)) ^ T2(STATE_BYTE(14)) ^ T3(STATE_BYTE(3)); C2 = T0(STATE_BYTE(8)) ^ T1(STATE_BYTE(13)) ^ T2(STATE_BYTE(2)) ^ T3(STATE_BYTE(7)); C3 = T0(STATE_BYTE(12)) ^ T1(STATE_BYTE(1)) ^ T2(STATE_BYTE(6)) ^ T3(STATE_BYTE(11)); /* Round key addition */ COLUMN_0(state) = C0 ^ *roundkeyw++; COLUMN_1(state) = C1 ^ *roundkeyw++; COLUMN_2(state) = C2 ^ *roundkeyw++; COLUMN_3(state) = C3 ^ *roundkeyw++; } /* Step 3: Do the last round */ /* Final round does not employ MixColumn */ C0 = ((BYTE0WORD(T2(STATE_BYTE(0)))) | (BYTE1WORD(T3(STATE_BYTE(5)))) | (BYTE2WORD(T0(STATE_BYTE(10)))) | (BYTE3WORD(T1(STATE_BYTE(15))))) ^ *roundkeyw++; C1 = ((BYTE0WORD(T2(STATE_BYTE(4)))) | (BYTE1WORD(T3(STATE_BYTE(9)))) | (BYTE2WORD(T0(STATE_BYTE(14)))) | (BYTE3WORD(T1(STATE_BYTE(3))))) ^ *roundkeyw++; C2 = ((BYTE0WORD(T2(STATE_BYTE(8)))) | (BYTE1WORD(T3(STATE_BYTE(13)))) | (BYTE2WORD(T0(STATE_BYTE(2)))) | (BYTE3WORD(T1(STATE_BYTE(7))))) ^ *roundkeyw++; C3 = ((BYTE0WORD(T2(STATE_BYTE(12)))) | (BYTE1WORD(T3(STATE_BYTE(1)))) | (BYTE2WORD(T0(STATE_BYTE(6)))) | (BYTE3WORD(T1(STATE_BYTE(11))))) ^ *roundkeyw++; *((PRUint32 *)pOut) = C0; *((PRUint32 *)(pOut + 4)) = C1; *((PRUint32 *)(pOut + 8)) = C2; *((PRUint32 *)(pOut + 12)) = C3; #if defined(NSS_X86_OR_X64) #undef pIn #undef pOut #else if ((ptrdiff_t)output & 0x3) { memcpy(output, outBuf, sizeof outBuf); } #endif } static void NO_SANITIZE_ALIGNMENT rijndael_decryptBlock128(AESContext *cx, unsigned char *output, const unsigned char *input) { int r; PRUint32 *roundkeyw; rijndael_state state; PRUint32 C0, C1, C2, C3; #if defined(NSS_X86_OR_X64) #define pIn input #define pOut output #else unsigned char *pIn, *pOut; PRUint32 inBuf[4], outBuf[4]; if ((ptrdiff_t)input & 0x3) { memcpy(inBuf, input, sizeof inBuf); pIn = (unsigned char *)inBuf; } else { pIn = (unsigned char *)input; } if ((ptrdiff_t)output & 0x3) { pOut = (unsigned char *)outBuf; } else { pOut = (unsigned char *)output; } #endif roundkeyw = cx->k.expandedKey + cx->Nb * cx->Nr + 3; /* reverse the final key addition */ COLUMN_3(state) = *((PRUint32 *)(pIn + 12)) ^ *roundkeyw--; COLUMN_2(state) = *((PRUint32 *)(pIn + 8)) ^ *roundkeyw--; COLUMN_1(state) = *((PRUint32 *)(pIn + 4)) ^ *roundkeyw--; COLUMN_0(state) = *((PRUint32 *)(pIn)) ^ *roundkeyw--; /* Loop over rounds in reverse [NR..1] */ for (r = cx->Nr; r > 1; --r) { /* Invert the (InvByteSub*InvMixColumn)(InvShiftRow(state)) */ C0 = TInv0(STATE_BYTE(0)) ^ TInv1(STATE_BYTE(13)) ^ TInv2(STATE_BYTE(10)) ^ TInv3(STATE_BYTE(7)); C1 = TInv0(STATE_BYTE(4)) ^ TInv1(STATE_BYTE(1)) ^ TInv2(STATE_BYTE(14)) ^ TInv3(STATE_BYTE(11)); C2 = TInv0(STATE_BYTE(8)) ^ TInv1(STATE_BYTE(5)) ^ TInv2(STATE_BYTE(2)) ^ TInv3(STATE_BYTE(15)); C3 = TInv0(STATE_BYTE(12)) ^ TInv1(STATE_BYTE(9)) ^ TInv2(STATE_BYTE(6)) ^ TInv3(STATE_BYTE(3)); /* Invert the key addition step */ COLUMN_3(state) = C3 ^ *roundkeyw--; COLUMN_2(state) = C2 ^ *roundkeyw--; COLUMN_1(state) = C1 ^ *roundkeyw--; COLUMN_0(state) = C0 ^ *roundkeyw--; } /* inverse sub */ pOut[0] = SINV(STATE_BYTE(0)); pOut[1] = SINV(STATE_BYTE(13)); pOut[2] = SINV(STATE_BYTE(10)); pOut[3] = SINV(STATE_BYTE(7)); pOut[4] = SINV(STATE_BYTE(4)); pOut[5] = SINV(STATE_BYTE(1)); pOut[6] = SINV(STATE_BYTE(14)); pOut[7] = SINV(STATE_BYTE(11)); pOut[8] = SINV(STATE_BYTE(8)); pOut[9] = SINV(STATE_BYTE(5)); pOut[10] = SINV(STATE_BYTE(2)); pOut[11] = SINV(STATE_BYTE(15)); pOut[12] = SINV(STATE_BYTE(12)); pOut[13] = SINV(STATE_BYTE(9)); pOut[14] = SINV(STATE_BYTE(6)); pOut[15] = SINV(STATE_BYTE(3)); /* final key addition */ *((PRUint32 *)(pOut + 12)) ^= *roundkeyw--; *((PRUint32 *)(pOut + 8)) ^= *roundkeyw--; *((PRUint32 *)(pOut + 4)) ^= *roundkeyw--; *((PRUint32 *)pOut) ^= *roundkeyw--; #if defined(NSS_X86_OR_X64) #undef pIn #undef pOut #else if ((ptrdiff_t)output & 0x3) { memcpy(output, outBuf, sizeof outBuf); } #endif } /************************************************************************** * * Rijndael modes of operation (ECB and CBC) * *************************************************************************/ static SECStatus rijndael_encryptECB(AESContext *cx, unsigned char *output, unsigned int *outputLen, unsigned int maxOutputLen, const unsigned char *input, unsigned int inputLen) { PRBool aesni = aesni_support(); while (inputLen > 0) { if (aesni) { rijndael_native_encryptBlock(cx, output, input); } else { rijndael_encryptBlock128(cx, output, input); } output += AES_BLOCK_SIZE; input += AES_BLOCK_SIZE; inputLen -= AES_BLOCK_SIZE; } return SECSuccess; } static SECStatus rijndael_encryptCBC(AESContext *cx, unsigned char *output, unsigned int *outputLen, unsigned int maxOutputLen, const unsigned char *input, unsigned int inputLen) { unsigned char *lastblock = cx->iv; unsigned char inblock[AES_BLOCK_SIZE * 8]; PRBool aesni = aesni_support(); if (!inputLen) return SECSuccess; while (inputLen > 0) { if (aesni) { /* XOR with the last block (IV if first block) */ native_xorBlock(inblock, input, lastblock); /* encrypt */ rijndael_native_encryptBlock(cx, output, inblock); } else { xorBlock(inblock, input, lastblock); rijndael_encryptBlock128(cx, output, inblock); } /* move to the next block */ lastblock = output; output += AES_BLOCK_SIZE; input += AES_BLOCK_SIZE; inputLen -= AES_BLOCK_SIZE; } memcpy(cx->iv, lastblock, AES_BLOCK_SIZE); return SECSuccess; } static SECStatus rijndael_decryptECB(AESContext *cx, unsigned char *output, unsigned int *outputLen, unsigned int maxOutputLen, const unsigned char *input, unsigned int inputLen) { PRBool aesni = aesni_support(); while (inputLen > 0) { if (aesni) { rijndael_native_decryptBlock(cx, output, input); } else { rijndael_decryptBlock128(cx, output, input); } output += AES_BLOCK_SIZE; input += AES_BLOCK_SIZE; inputLen -= AES_BLOCK_SIZE; } return SECSuccess; } static SECStatus rijndael_decryptCBC(AESContext *cx, unsigned char *output, unsigned int *outputLen, unsigned int maxOutputLen, const unsigned char *input, unsigned int inputLen) { const unsigned char *in; unsigned char *out; unsigned char newIV[AES_BLOCK_SIZE]; PRBool aesni = aesni_support(); if (!inputLen) return SECSuccess; PORT_Assert(output - input >= 0 || input - output >= (int)inputLen); in = input + (inputLen - AES_BLOCK_SIZE); memcpy(newIV, in, AES_BLOCK_SIZE); out = output + (inputLen - AES_BLOCK_SIZE); while (inputLen > AES_BLOCK_SIZE) { if (aesni) { // Use hardware acceleration for normal AES parameters. rijndael_native_decryptBlock(cx, out, in); native_xorBlock(out, out, &in[-AES_BLOCK_SIZE]); } else { rijndael_decryptBlock128(cx, out, in); xorBlock(out, out, &in[-AES_BLOCK_SIZE]); } out -= AES_BLOCK_SIZE; in -= AES_BLOCK_SIZE; inputLen -= AES_BLOCK_SIZE; } if (in == input) { if (aesni) { rijndael_native_decryptBlock(cx, out, in); native_xorBlock(out, out, cx->iv); } else { rijndael_decryptBlock128(cx, out, in); xorBlock(out, out, cx->iv); } } memcpy(cx->iv, newIV, AES_BLOCK_SIZE); return SECSuccess; } /************************************************************************ * * BLAPI Interface functions * * The following functions implement the encryption routines defined in * BLAPI for the AES cipher, Rijndael. * ***********************************************************************/ AESContext * AES_AllocateContext(void) { return PORT_ZNewAligned(AESContext, 16, mem); } /* ** Initialize a new AES context suitable for AES encryption/decryption in ** the ECB or CBC mode. ** "mode" the mode of operation, which must be NSS_AES or NSS_AES_CBC */ static SECStatus aes_InitContext(AESContext *cx, const unsigned char *key, unsigned int keysize, const unsigned char *iv, int mode, unsigned int encrypt) { unsigned int Nk; PRBool use_hw_aes; /* According to AES, block lengths are 128 and key lengths are 128, 192, or * 256 bits. We support other key sizes as well [128, 256] as long as the * length in bytes is divisible by 4. */ if (key == NULL || keysize < AES_BLOCK_SIZE || keysize > 32 || keysize % 4 != 0) { PORT_SetError(SEC_ERROR_INVALID_ARGS); return SECFailure; } if (mode != NSS_AES && mode != NSS_AES_CBC) { PORT_SetError(SEC_ERROR_INVALID_ARGS); return SECFailure; } if (mode == NSS_AES_CBC && iv == NULL) { PORT_SetError(SEC_ERROR_INVALID_ARGS); return SECFailure; } if (!cx) { PORT_SetError(SEC_ERROR_INVALID_ARGS); return SECFailure; } #if defined(NSS_X86_OR_X64) || defined(USE_HW_AES) use_hw_aes = (aesni_support() || arm_aes_support()) && (keysize % 8) == 0; #else use_hw_aes = PR_FALSE; #endif /* Nb = (block size in bits) / 32 */ cx->Nb = AES_BLOCK_SIZE / 4; /* Nk = (key size in bits) / 32 */ Nk = keysize / 4; /* Obtain number of rounds from "table" */ cx->Nr = RIJNDAEL_NUM_ROUNDS(Nk, cx->Nb); /* copy in the iv, if neccessary */ if (mode == NSS_AES_CBC) { memcpy(cx->iv, iv, AES_BLOCK_SIZE); #ifdef USE_HW_AES if (use_hw_aes) { cx->worker = (freeblCipherFunc) native_aes_cbc_worker(encrypt, keysize); } else #endif { cx->worker = (freeblCipherFunc)(encrypt ? &rijndael_encryptCBC : &rijndael_decryptCBC); } } else { #ifdef USE_HW_AES if (use_hw_aes) { cx->worker = (freeblCipherFunc) native_aes_ecb_worker(encrypt, keysize); } else #endif { cx->worker = (freeblCipherFunc)(encrypt ? &rijndael_encryptECB : &rijndael_decryptECB); } } PORT_Assert((cx->Nb * (cx->Nr + 1)) <= RIJNDAEL_MAX_EXP_KEY_SIZE); if ((cx->Nb * (cx->Nr + 1)) > RIJNDAEL_MAX_EXP_KEY_SIZE) { PORT_SetError(SEC_ERROR_LIBRARY_FAILURE); return SECFailure; } #ifdef USE_HW_AES if (use_hw_aes) { native_aes_init(encrypt, keysize); } else #endif { /* Generate expanded key */ if (encrypt) { if (use_hw_aes && (cx->mode == NSS_AES_GCM || cx->mode == NSS_AES || cx->mode == NSS_AES_CTR)) { PORT_Assert(keysize == 16 || keysize == 24 || keysize == 32); /* Prepare hardware key for normal AES parameters. */ rijndael_native_key_expansion(cx, key, Nk); } else { rijndael_key_expansion(cx, key, Nk); } } else { rijndael_invkey_expansion(cx, key, Nk); } } cx->worker_cx = cx; cx->destroy = NULL; cx->isBlock = PR_TRUE; return SECSuccess; } SECStatus AES_InitContext(AESContext *cx, const unsigned char *key, unsigned int keysize, const unsigned char *iv, int mode, unsigned int encrypt, unsigned int blocksize) { int basemode = mode; PRBool baseencrypt = encrypt; SECStatus rv; if (blocksize != AES_BLOCK_SIZE) { PORT_SetError(SEC_ERROR_INVALID_ARGS); return SECFailure; } switch (mode) { case NSS_AES_CTS: basemode = NSS_AES_CBC; break; case NSS_AES_GCM: case NSS_AES_CTR: basemode = NSS_AES; baseencrypt = PR_TRUE; break; } /* Make sure enough is initialized so we can safely call Destroy. */ cx->worker_cx = NULL; cx->destroy = NULL; cx->mode = mode; rv = aes_InitContext(cx, key, keysize, iv, basemode, baseencrypt); if (rv != SECSuccess) { AES_DestroyContext(cx, PR_FALSE); return rv; } /* finally, set up any mode specific contexts */ cx->worker_aead = 0; switch (mode) { case NSS_AES_CTS: cx->worker_cx = CTS_CreateContext(cx, cx->worker, iv); cx->worker = (freeblCipherFunc)(encrypt ? CTS_EncryptUpdate : CTS_DecryptUpdate); cx->destroy = (freeblDestroyFunc)CTS_DestroyContext; cx->isBlock = PR_FALSE; break; case NSS_AES_GCM: #if defined(INTEL_GCM) && defined(USE_HW_AES) if (aesni_support() && (keysize % 8) == 0 && avx_support() && clmul_support()) { cx->worker_cx = intel_AES_GCM_CreateContext(cx, cx->worker, iv); cx->worker = (freeblCipherFunc)(encrypt ? intel_AES_GCM_EncryptUpdate : intel_AES_GCM_DecryptUpdate); cx->worker_aead = (freeblAeadFunc)(encrypt ? intel_AES_GCM_EncryptAEAD : intel_AES_GCM_DecryptAEAD); cx->destroy = (freeblDestroyFunc)intel_AES_GCM_DestroyContext; cx->isBlock = PR_FALSE; } else #endif { cx->worker_cx = GCM_CreateContext(cx, cx->worker, iv); cx->worker = (freeblCipherFunc)(encrypt ? GCM_EncryptUpdate : GCM_DecryptUpdate); cx->worker_aead = (freeblAeadFunc)(encrypt ? GCM_EncryptAEAD : GCM_DecryptAEAD); cx->destroy = (freeblDestroyFunc)GCM_DestroyContext; cx->isBlock = PR_FALSE; } break; case NSS_AES_CTR: cx->worker_cx = CTR_CreateContext(cx, cx->worker, iv); #if defined(USE_HW_AES) && defined(_MSC_VER) && defined(NSS_X86_OR_X64) if (aesni_support() && (keysize % 8) == 0) { cx->worker = (freeblCipherFunc)CTR_Update_HW_AES; } else #endif { cx->worker = (freeblCipherFunc)CTR_Update; } cx->destroy = (freeblDestroyFunc)CTR_DestroyContext; cx->isBlock = PR_FALSE; break; default: /* everything has already been set up by aes_InitContext, just * return */ return SECSuccess; } /* check to see if we succeeded in getting the worker context */ if (cx->worker_cx == NULL) { /* no, just destroy the existing context */ cx->destroy = NULL; /* paranoia, though you can see a dozen lines */ /* below that this isn't necessary */ AES_DestroyContext(cx, PR_FALSE); return SECFailure; } return SECSuccess; } /* AES_CreateContext * * create a new context for Rijndael operations */ AESContext * AES_CreateContext(const unsigned char *key, const unsigned char *iv, int mode, int encrypt, unsigned int keysize, unsigned int blocksize) { AESContext *cx = AES_AllocateContext(); if (cx) { SECStatus rv = AES_InitContext(cx, key, keysize, iv, mode, encrypt, blocksize); if (rv != SECSuccess) { AES_DestroyContext(cx, PR_TRUE); cx = NULL; } } return cx; } /* * AES_DestroyContext * * Zero an AES cipher context. If freeit is true, also free the pointer * to the context. */ void AES_DestroyContext(AESContext *cx, PRBool freeit) { void *mem = cx->mem; if (cx->worker_cx && cx->destroy) { (*cx->destroy)(cx->worker_cx, PR_TRUE); cx->worker_cx = NULL; cx->destroy = NULL; } PORT_Memset(cx, 0, sizeof(AESContext)); if (freeit) { PORT_Free(mem); } else { /* if we are not freeing the context, restore mem, We may get called * again to actually free the context */ cx->mem = mem; } } /* * AES_Encrypt * * Encrypt an arbitrary-length buffer. The output buffer must already be * allocated to at least inputLen. */ SECStatus AES_Encrypt(AESContext *cx, unsigned char *output, unsigned int *outputLen, unsigned int maxOutputLen, const unsigned char *input, unsigned int inputLen) { /* Check args */ if (cx == NULL || output == NULL || (input == NULL && inputLen != 0)) { PORT_SetError(SEC_ERROR_INVALID_ARGS); return SECFailure; } if (cx->isBlock && (inputLen % AES_BLOCK_SIZE != 0)) { PORT_SetError(SEC_ERROR_INPUT_LEN); return SECFailure; } if (maxOutputLen < inputLen) { PORT_SetError(SEC_ERROR_OUTPUT_LEN); return SECFailure; } *outputLen = inputLen; #if UINT_MAX > MP_32BIT_MAX /* * we can guarentee that GSM won't overlfow if we limit the input to * 2^36 bytes. For simplicity, we are limiting it to 2^32 for now. * * We do it here to cover both hardware and software GCM operations. */ { PR_STATIC_ASSERT(sizeof(unsigned int) > 4); } if ((cx->mode == NSS_AES_GCM) && (inputLen > MP_32BIT_MAX)) { PORT_SetError(SEC_ERROR_OUTPUT_LEN); return SECFailure; } #else /* if we can't pass in a 32_bit number, then no such check needed */ { PR_STATIC_ASSERT(sizeof(unsigned int) <= 4); } #endif return (*cx->worker)(cx->worker_cx, output, outputLen, maxOutputLen, input, inputLen, AES_BLOCK_SIZE); } /* * AES_Decrypt * * Decrypt and arbitrary-length buffer. The output buffer must already be * allocated to at least inputLen. */ SECStatus AES_Decrypt(AESContext *cx, unsigned char *output, unsigned int *outputLen, unsigned int maxOutputLen, const unsigned char *input, unsigned int inputLen) { /* Check args */ if (cx == NULL || output == NULL || (input == NULL && inputLen != 0)) { PORT_SetError(SEC_ERROR_INVALID_ARGS); return SECFailure; } if (cx->isBlock && (inputLen % AES_BLOCK_SIZE != 0)) { PORT_SetError(SEC_ERROR_INPUT_LEN); return SECFailure; } if ((cx->mode != NSS_AES_GCM) && (maxOutputLen < inputLen)) { PORT_SetError(SEC_ERROR_OUTPUT_LEN); return SECFailure; } *outputLen = inputLen; return (*cx->worker)(cx->worker_cx, output, outputLen, maxOutputLen, input, inputLen, AES_BLOCK_SIZE); } /* * AES_Encrypt_AEAD * * Encrypt using GCM or CCM. include the nonce, extra data, and the tag */ SECStatus AES_AEAD(AESContext *cx, unsigned char *output, unsigned int *outputLen, unsigned int maxOutputLen, const unsigned char *input, unsigned int inputLen, void *params, unsigned int paramsLen, const unsigned char *aad, unsigned int aadLen) { /* Check args */ if (cx == NULL || output == NULL || (input == NULL && inputLen != 0) || (aad == NULL && aadLen != 0) || params == NULL) { PORT_SetError(SEC_ERROR_INVALID_ARGS); return SECFailure; } if (cx->worker_aead == NULL) { PORT_SetError(SEC_ERROR_NOT_INITIALIZED); return SECFailure; } if (maxOutputLen < inputLen) { PORT_SetError(SEC_ERROR_OUTPUT_LEN); return SECFailure; } *outputLen = inputLen; #if UINT_MAX > MP_32BIT_MAX /* * we can guarentee that GSM won't overlfow if we limit the input to * 2^36 bytes. For simplicity, we are limiting it to 2^32 for now. * * We do it here to cover both hardware and software GCM operations. */ { PR_STATIC_ASSERT(sizeof(unsigned int) > 4); } if (inputLen > MP_32BIT_MAX) { PORT_SetError(SEC_ERROR_OUTPUT_LEN); return SECFailure; } #else /* if we can't pass in a 32_bit number, then no such check needed */ { PR_STATIC_ASSERT(sizeof(unsigned int) <= 4); } #endif return (*cx->worker_aead)(cx->worker_cx, output, outputLen, maxOutputLen, input, inputLen, params, paramsLen, aad, aadLen, AES_BLOCK_SIZE); }