/* * The contents of this file are subject to the Mozilla Public * License Version 1.1 (the "License"); you may not use this file * except in compliance with the License. You may obtain a copy of * the License at http://www.mozilla.org/MPL/ * * Software distributed under the License is distributed on an "AS * IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or * implied. See the License for the specific language governing * rights and limitations under the License. * * The Original Code is the Netscape security libraries. * * The Initial Developer of the Original Code is Netscape * Communications Corporation. Portions created by Netscape are * Copyright (C) 1994-2000 Netscape Communications Corporation. All * Rights Reserved. * * Contributor(s): * * Alternatively, the contents of this file may be used under the * terms of the GNU General Public License Version 2 or later (the * "GPL"), in which case the provisions of the GPL are applicable * instead of those above. If you wish to allow use of your * version of this file only under the terms of the GPL and not to * allow others to use your version of this file under the MPL, * indicate your decision by deleting the provisions above and * replace them with the notice and other provisions required by * the GPL. If you do not delete the provisions above, a recipient * may use your version of this file under either the MPL or the * GPL. * * $Id$ */ #include "prinit.h" #include "prerr.h" #include "secerr.h" #include "prtypes.h" #include "blapi.h" #include "rijndael.h" /* * There are currently five ways to build this code, varying in performance * and code size. * * RIJNDAEL_INCLUDE_TABLES Include all tables from rijndael32.tab * RIJNDAEL_GENERATE_TABLES Generate tables on first * encryption/decryption, then store them; * use the function gfm * RIJNDAEL_GENERATE_TABLES_MACRO Same as above, but use macros to do * the generation * 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) \ (((b3) << 24) | ((b2) << 16) | ((b1) << 8) | (b0)) #else #define WORD4(b0, b1, b2, b3) \ (((b0) << 24) | ((b1) << 16) | ((b2) << 8) | (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_TABLES_MACRO) || \ 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_TABLES or 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) #elif defined(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) #else /* RIJNDAEL_GENERATE_TABLES or RIJNDAEL_GENERATE_TABLES_MACRO */ /* Generate T and T**-1 table values and store, then index */ /* The inverse mix column tables are still generated */ #define T0(i) rijndaelTables->T0[i] #define T1(i) rijndaelTables->T1[i] #define T2(i) rijndaelTables->T2[i] #define T3(i) rijndaelTables->T3[i] #define TInv0(i) rijndaelTables->TInv0[i] #define TInv1(i) rijndaelTables->TInv1[i] #define TInv2(i) rijndaelTables->TInv2[i] #define TInv3(i) rijndaelTables->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 */ #if defined(RIJNDAEL_GENERATE_TABLES) || \ defined(RIJNDAEL_GENERATE_TABLES_MACRO) /* Code to generate and store the tables */ struct rijndael_tables_str { PRUint32 T0[256]; PRUint32 T1[256]; PRUint32 T2[256]; PRUint32 T3[256]; PRUint32 TInv0[256]; PRUint32 TInv1[256]; PRUint32 TInv2[256]; PRUint32 TInv3[256]; }; static struct rijndael_tables_str *rijndaelTables = NULL; static PRCallOnceType coRTInit = { 0, 0, 0 }; static PRStatus init_rijndael_tables(void) { PRUint32 i; PRUint8 si01, si02, si03, si04, si08, si09, si0B, si0D, si0E; struct rijndael_tables_str *rts; rts = (struct rijndael_tables_str *) PORT_Alloc(sizeof(struct rijndael_tables_str)); if (!rts) return PR_FAILURE; for (i=0; i<256; i++) { /* The forward values */ si01 = SBOX(i); si02 = XTIME(si01); si03 = si02 ^ si01; rts->T0[i] = WORD4(si02, si01, si01, si03); rts->T1[i] = WORD4(si03, si02, si01, si01); rts->T2[i] = WORD4(si01, si03, si02, si01); rts->T3[i] = WORD4(si01, si01, si03, si02); /* The inverse values */ 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; rts->TInv0[i] = WORD4(si0E, si09, si0D, si0B); rts->TInv1[i] = WORD4(si0B, si0E, si09, si0D); rts->TInv2[i] = WORD4(si0D, si0B, si0E, si09); rts->TInv3[i] = WORD4(si09, si0D, si0B, si0E); } /* wait until all the values are in to set */ rijndaelTables = rts; return PR_SUCCESS; } #endif /* code to generate tables */ /************************************************************************** * * Stuff related to the Rijndael key schedule * *************************************************************************/ #define SUBBYTE(w) \ ((SBOX((w >> 24) & 0xff) << 24) | \ (SBOX((w >> 16) & 0xff) << 16) | \ (SBOX((w >> 8) & 0xff) << 8) | \ (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 SECStatus rijndael_key_expansion7(AESContext *cx, unsigned char *key, unsigned int Nk) { unsigned int i; PRUint32 *W; PRUint32 *pW; PRUint32 tmp; W = cx->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; } return SECSuccess; } /* rijndael_key_expansion * * Generate the expanded key from the key input by the user. */ static SECStatus rijndael_key_expansion(AESContext *cx, 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) return rijndael_key_expansion7(cx, key, Nk); W = cx->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; } } return SECSuccess; } /* rijndael_invkey_expansion * * Generate the expanded key for the inverse cipher from the key input by * the user. */ static SECStatus rijndael_invkey_expansion(AESContext *cx, unsigned char *key, unsigned int Nk) { unsigned int r; PRUint32 *roundkeyw; PRUint8 *b; int Nb = cx->Nb; /* begins like usual key expansion ... */ if (rijndael_key_expansion(cx, key, Nk) != SECSuccess) return SECFailure; /* ... but has the additional step of InvMixColumn, * excepting the first and last round keys. */ roundkeyw = cx->expandedKey + cx->Nb; for (r=1; rNr; ++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]); } } return SECSuccess; } /************************************************************************** * * Stuff related to Rijndael encryption/decryption, optimized for * a 128-bit blocksize. * *************************************************************************/ #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] static SECStatus 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(_X86_) #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->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; rNr; ++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(_X86_) #undef pIn #undef pOut #else if ((ptrdiff_t)output & 0x3) { memcpy(output, outBuf, sizeof outBuf); } #endif return SECSuccess; } static SECStatus 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(_X86_) #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->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(_X86_) #undef pIn #undef pOut #else if ((ptrdiff_t)output & 0x3) { memcpy(output, outBuf, sizeof outBuf); } #endif return SECSuccess; } /************************************************************************** * * Stuff related to general Rijndael encryption/decryption, for blocksizes * greater than 128 bits. * * XXX This code is currently untested! So far, AES specs have only been * released for 128 bit blocksizes. This will be tested, but for now * only the code above has been tested using known values. * *************************************************************************/ #define COLUMN(array, j) *((PRUint32 *)(array + j)) SECStatus rijndael_encryptBlock(AESContext *cx, unsigned char *output, const unsigned char *input) { return SECFailure; #ifdef rijndael_large_blocks_fixed unsigned int j, r, Nb; unsigned int c2=0, c3=0; PRUint32 *roundkeyw; PRUint8 clone[RIJNDAEL_MAX_STATE_SIZE]; Nb = cx->Nb; roundkeyw = cx->expandedKey; /* Step 1: Add Round Key 0 to initial state */ for (j=0; j<4*Nb; j+=4) { COLUMN(clone, j) = COLUMN(input, j) ^ *roundkeyw++; } /* Step 2: Loop over rounds [1..NR-1] */ for (r=1; rNr; ++r) { for (j=0; jNb; roundkeyw = cx->expandedKey + cx->Nb * cx->Nr + 3; /* reverse key addition */ for (j=4*Nb; j>=0; j-=4) { COLUMN(clone, j) = COLUMN(input, j) ^ *roundkeyw--; } /* Loop over rounds in reverse [NR..1] */ for (r=cx->Nr; r>1; --r) { /* Invert the (InvByteSub*InvMixColumn)(InvShiftRow(state)) */ for (j=0; j=0; j-=4) { COLUMN(clone, j) = COLUMN(output, j) ^ *roundkeyw--; } } /* inverse sub */ for (j=0; j<4*Nb; ++j) { output[j] = SINV(clone[j]); } /* final key addition */ for (j=4*Nb; j>=0; j-=4) { COLUMN(output, j) ^= *roundkeyw--; } return SECSuccess; #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, int blocksize) { SECStatus rv; AESBlockFunc *encryptor; encryptor = (blocksize == RIJNDAEL_MIN_BLOCKSIZE) ? &rijndael_encryptBlock128 : &rijndael_encryptBlock; while (inputLen > 0) { rv = (*encryptor)(cx, output, input); if (rv != SECSuccess) return rv; output += blocksize; input += blocksize; inputLen -= blocksize; } return SECSuccess; } static SECStatus rijndael_encryptCBC(AESContext *cx, unsigned char *output, unsigned int *outputLen, unsigned int maxOutputLen, const unsigned char *input, unsigned int inputLen, int blocksize) { int j; SECStatus rv; AESBlockFunc *encryptor; unsigned char *lastblock; unsigned char inblock[RIJNDAEL_MAX_STATE_SIZE * 8]; if (!inputLen) return SECSuccess; lastblock = cx->iv; encryptor = (blocksize == RIJNDAEL_MIN_BLOCKSIZE) ? &rijndael_encryptBlock128 : &rijndael_encryptBlock; while (inputLen > 0) { /* XOR with the last block (IV if first block) */ for (j=0; jiv, lastblock, blocksize); return SECSuccess; } static SECStatus rijndael_decryptECB(AESContext *cx, unsigned char *output, unsigned int *outputLen, unsigned int maxOutputLen, const unsigned char *input, unsigned int inputLen, int blocksize) { SECStatus rv; AESBlockFunc *decryptor; decryptor = (blocksize == RIJNDAEL_MIN_BLOCKSIZE) ? &rijndael_decryptBlock128 : &rijndael_decryptBlock; while (inputLen > 0) { rv = (*decryptor)(cx, output, input); if (rv != SECSuccess) return rv; output += blocksize; input += blocksize; inputLen -= blocksize; } return SECSuccess; } static SECStatus rijndael_decryptCBC(AESContext *cx, unsigned char *output, unsigned int *outputLen, unsigned int maxOutputLen, const unsigned char *input, unsigned int inputLen, int blocksize) { SECStatus rv; AESBlockFunc *decryptor; const unsigned char *in; unsigned char *out; int j; unsigned char newIV[RIJNDAEL_MAX_BLOCKSIZE]; if (!inputLen) return SECSuccess; PORT_Assert(output - input >= 0 || input - output >= (int)inputLen ); decryptor = (blocksize == RIJNDAEL_MIN_BLOCKSIZE) ? &rijndael_decryptBlock128 : &rijndael_decryptBlock; in = input + (inputLen - blocksize); memcpy(newIV, in, blocksize); out = output + (inputLen - blocksize); while (inputLen > blocksize) { rv = (*decryptor)(cx, out, in); if (rv != SECSuccess) return rv; for (j=0; jiv[j]; } memcpy(cx->iv, newIV, blocksize); return SECSuccess; } /************************************************************************ * * BLAPI Interface functions * * The following functions implement the encryption routines defined in * BLAPI for the AES cipher, Rijndael. * ***********************************************************************/ /* AES_CreateContext * * create a new context for Rijndael operations */ AESContext * AES_CreateContext(unsigned char *key, unsigned char *iv, int mode, int encrypt, unsigned int keysize, unsigned int blocksize) { AESContext *cx; unsigned int Nk; /* According to Rijndael AES Proposal, section 12.1, block and key * lengths between 128 and 256 bits are supported, as long as the * length in bytes is divisible by 4. */ if (key == NULL || keysize < RIJNDAEL_MIN_BLOCKSIZE || keysize > RIJNDAEL_MAX_BLOCKSIZE || keysize % 4 != 0 || blocksize < RIJNDAEL_MIN_BLOCKSIZE || blocksize > RIJNDAEL_MAX_BLOCKSIZE || blocksize % 4 != 0) { PORT_SetError(SEC_ERROR_INVALID_ARGS); return NULL; } if (mode != NSS_AES && mode != NSS_AES_CBC) { PORT_SetError(SEC_ERROR_INVALID_ARGS); return NULL; } if (mode == NSS_AES_CBC && iv == NULL) { PORT_SetError(SEC_ERROR_INVALID_ARGS); return NULL; } cx = PORT_ZNew(AESContext); if (!cx) { PORT_SetError(SEC_ERROR_NO_MEMORY); return NULL; } /* Nb = (block size in bits) / 32 */ cx->Nb = blocksize / 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, blocksize); cx->worker = (encrypt) ? &rijndael_encryptCBC : &rijndael_decryptCBC; } else { cx->worker = (encrypt) ? &rijndael_encryptECB : &rijndael_decryptECB; } /* Allocate memory for the expanded key */ cx->expandedKey = PORT_ZNewArray(PRUint32, cx->Nb * (cx->Nr + 1)); if (!cx->expandedKey) { PORT_SetError(SEC_ERROR_NO_MEMORY); goto cleanup; } /* Generate expanded key */ if (encrypt) { if (rijndael_key_expansion(cx, key, Nk) != SECSuccess) goto cleanup; } else { if (rijndael_invkey_expansion(cx, key, Nk) != SECSuccess) goto cleanup; } return cx; cleanup: if (cx->expandedKey) PORT_ZFree(cx->expandedKey, cx->Nb * (cx->Nr + 1)); PORT_ZFree(cx, sizeof *cx); return NULL; } /* * 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) { PORT_ZFree(cx->expandedKey, cx->Nb * (cx->Nr + 1)); memset(cx, 0, sizeof *cx); if (freeit) PORT_Free(cx); } /* * 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) { int blocksize; /* Check args */ if (cx == NULL || output == NULL || input == NULL) { PORT_SetError(SEC_ERROR_INVALID_ARGS); return SECFailure; } blocksize = 4 * cx->Nb; if (inputLen % blocksize != 0) { PORT_SetError(SEC_ERROR_INPUT_LEN); return SECFailure; } if (maxOutputLen < inputLen) { PORT_SetError(SEC_ERROR_OUTPUT_LEN); return SECFailure; } *outputLen = inputLen; #if defined(RIJNDAEL_GENERATE_TABLES) || \ defined(RIJNDAEL_GENERATE_TABLES_MACRO) if (rijndaelTables == NULL) { if (PR_CallOnce(&coRTInit, init_rijndael_tables) != PR_SUCCESS) { return PR_FAILURE; } } #endif return (*cx->worker)(cx, output, outputLen, maxOutputLen, input, inputLen, blocksize); } /* * 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) { int blocksize; /* Check args */ if (cx == NULL || output == NULL || input == NULL) { PORT_SetError(SEC_ERROR_INVALID_ARGS); return SECFailure; } blocksize = 4 * cx->Nb; if (inputLen % blocksize != 0) { PORT_SetError(SEC_ERROR_INPUT_LEN); return SECFailure; } if (maxOutputLen < inputLen) { PORT_SetError(SEC_ERROR_OUTPUT_LEN); return SECFailure; } *outputLen = inputLen; #if defined(RIJNDAEL_GENERATE_TABLES) || \ defined(RIJNDAEL_GENERATE_TABLES_MACRO) if (rijndaelTables == NULL) { if (PR_CallOnce(&coRTInit, init_rijndael_tables) != PR_SUCCESS) { return PR_FAILURE; } } #endif return (*cx->worker)(cx, output, outputLen, maxOutputLen, input, inputLen, blocksize); }