#include "tomcrypt.h"

Include dependency graph for aes.c:

Macros
#define	Te0(x) TE0[x]

#define	Te1(x) TE1[x]

#define	Te2(x) TE2[x]

#define	Te3(x) TE3[x]

#define	Td0(x) TD0[x]

#define	Td1(x) TD1[x]

#define	Td2(x) TD2[x]

#define	Td3(x) TD3[x]

Functions
static ulong32	setup_mix (ulong32 temp)

int	aes_setup (const unsigned char key, int keylen, int rounds, aes_key skey)

void	aes_ecb_encrypt (const unsigned char pt, unsigned char ct, aes_key *skey)

void	aes_ecb_decrypt (const unsigned char ct, unsigned char pt, aes_key *skey)

Variables
static const ulong32	TE0 [256]

static const ulong32	TD0 [256]

static const ulong32	Td4 [256]

static const ulong32	TE1 [256]

static const ulong32	TE2 [256]

static const ulong32	TE3 [256]

static const ulong32	Te4_0 []

static const ulong32	Te4_1 []

static const ulong32	Te4_2 []

static const ulong32	Te4_3 []

static const ulong32	TD1 [256]

static const ulong32	TD2 [256]

static const ulong32	TD3 [256]

static const ulong32	Tks0 []

static const ulong32	Tks1 []

static const ulong32	Tks2 []

static const ulong32	Tks3 []

static const ulong32	rcon []

Macro Definition Documentation

◆ Td0

#define Td0 ( x ) TD0[x]

Definition at line 239 of file aes.c.

◆ Td1

#define Td1 ( x ) TD1[x]

Definition at line 240 of file aes.c.

◆ Td2

#define Td2 ( x ) TD2[x]

Definition at line 241 of file aes.c.

◆ Td3

#define Td3 ( x ) TD3[x]

Definition at line 242 of file aes.c.

◆ Te0

#define Te0 ( x ) TE0[x]

Definition at line 234 of file aes.c.

◆ Te1

#define Te1 ( x ) TE1[x]

Definition at line 235 of file aes.c.

◆ Te2

#define Te2 ( x ) TE2[x]

Definition at line 236 of file aes.c.

◆ Te3

#define Te3 ( x ) TE3[x]

Definition at line 237 of file aes.c.

Function Documentation

◆ aes_ecb_decrypt()

void aes_ecb_decrypt	(	const unsigned char *	ct,
		unsigned char *	pt,
		aes_key *	skey
	)

Definition at line 1165 of file aes.c.

{
    ulong32 s0, s1, s2, s3, t0, t1, t2, t3, *rk;
    int Nr, r;
 
    Nr = skey->Nr;
    rk = skey->dK;
 
    LOAD32H(s0, ct      ); s0 ^= rk[0];
    LOAD32H(s1, ct  +  4); s1 ^= rk[1];
    LOAD32H(s2, ct  +  8); s2 ^= rk[2];
    LOAD32H(s3, ct  + 12); s3 ^= rk[3];
 
    r = Nr >> 1;
    for (;;) {
 
        t0 =
            Td0(byte(s0, 3)) ^
            Td1(byte(s3, 2)) ^
            Td2(byte(s2, 1)) ^
            Td3(byte(s1, 0)) ^
            rk[4];
        t1 =
            Td0(byte(s1, 3)) ^
            Td1(byte(s0, 2)) ^
            Td2(byte(s3, 1)) ^
            Td3(byte(s2, 0)) ^
            rk[5];
        t2 =
            Td0(byte(s2, 3)) ^
            Td1(byte(s1, 2)) ^
            Td2(byte(s0, 1)) ^
            Td3(byte(s3, 0)) ^
            rk[6];
        t3 =
            Td0(byte(s3, 3)) ^
            Td1(byte(s2, 2)) ^
            Td2(byte(s1, 1)) ^
            Td3(byte(s0, 0)) ^
            rk[7];
 
        rk += 8;
        if (--r == 0) {
            break;
        }
 
 
        s0 =
            Td0(byte(t0, 3)) ^
            Td1(byte(t3, 2)) ^
            Td2(byte(t2, 1)) ^
            Td3(byte(t1, 0)) ^
            rk[0];
        s1 =
            Td0(byte(t1, 3)) ^
            Td1(byte(t0, 2)) ^
            Td2(byte(t3, 1)) ^
            Td3(byte(t2, 0)) ^
            rk[1];
        s2 =
            Td0(byte(t2, 3)) ^
            Td1(byte(t1, 2)) ^
            Td2(byte(t0, 1)) ^
            Td3(byte(t3, 0)) ^
            rk[2];
        s3 =
            Td0(byte(t3, 3)) ^
            Td1(byte(t2, 2)) ^
            Td2(byte(t1, 1)) ^
            Td3(byte(t0, 0)) ^
            rk[3];
    }
 
    s0 =
        (Td4[byte(t0, 3)] & 0xff000000) ^
        (Td4[byte(t3, 2)] & 0x00ff0000) ^
        (Td4[byte(t2, 1)] & 0x0000ff00) ^
        (Td4[byte(t1, 0)] & 0x000000ff) ^
        rk[0];
    STORE32H(s0, pt);
    s1 =
        (Td4[byte(t1, 3)] & 0xff000000) ^
        (Td4[byte(t0, 2)] & 0x00ff0000) ^
        (Td4[byte(t3, 1)] & 0x0000ff00) ^
        (Td4[byte(t2, 0)] & 0x000000ff) ^
        rk[1];
    STORE32H(s1, pt+4);
    s2 =
        (Td4[byte(t2, 3)] & 0xff000000) ^
        (Td4[byte(t1, 2)] & 0x00ff0000) ^
        (Td4[byte(t0, 1)] & 0x0000ff00) ^
        (Td4[byte(t3, 0)] & 0x000000ff) ^
        rk[2];
    STORE32H(s2, pt+8);
    s3 =
        (Td4[byte(t3, 3)] & 0xff000000) ^
        (Td4[byte(t2, 2)] & 0x00ff0000) ^
        (Td4[byte(t1, 1)] & 0x0000ff00) ^
        (Td4[byte(t0, 0)] & 0x000000ff) ^
        rk[3];
    STORE32H(s3, pt+12);
}

Referenced by encrypt_block_impl(), and KsecDecryptMemoryAes().

◆ aes_ecb_encrypt()

void aes_ecb_encrypt	(	const unsigned char *	pt,
		unsigned char *	ct,
		aes_key *	skey
	)

Definition at line 1064 of file aes.c.

{
    ulong32 s0, s1, s2, s3, t0, t1, t2, t3, *rk;
    int Nr, r;
 
    Nr = skey->Nr;
    rk = skey->eK;
 
    LOAD32H(s0, pt      ); s0 ^= rk[0];
    LOAD32H(s1, pt  +  4); s1 ^= rk[1];
    LOAD32H(s2, pt  +  8); s2 ^= rk[2];
    LOAD32H(s3, pt  + 12); s3 ^= rk[3];
 
    r = Nr >> 1;
    for (;;) {
        t0 =
            Te0(byte(s0, 3)) ^
            Te1(byte(s1, 2)) ^
            Te2(byte(s2, 1)) ^
            Te3(byte(s3, 0)) ^
            rk[4];
        t1 =
            Te0(byte(s1, 3)) ^
            Te1(byte(s2, 2)) ^
            Te2(byte(s3, 1)) ^
            Te3(byte(s0, 0)) ^
            rk[5];
        t2 =
            Te0(byte(s2, 3)) ^
            Te1(byte(s3, 2)) ^
            Te2(byte(s0, 1)) ^
            Te3(byte(s1, 0)) ^
            rk[6];
        t3 =
            Te0(byte(s3, 3)) ^
            Te1(byte(s0, 2)) ^
            Te2(byte(s1, 1)) ^
            Te3(byte(s2, 0)) ^
            rk[7];
 
        rk += 8;
        if (--r == 0) {
            break;
        }
 
        s0 =
            Te0(byte(t0, 3)) ^
            Te1(byte(t1, 2)) ^
            Te2(byte(t2, 1)) ^
            Te3(byte(t3, 0)) ^
            rk[0];
        s1 =
            Te0(byte(t1, 3)) ^
            Te1(byte(t2, 2)) ^
            Te2(byte(t3, 1)) ^
            Te3(byte(t0, 0)) ^
            rk[1];
        s2 =
            Te0(byte(t2, 3)) ^
            Te1(byte(t3, 2)) ^
            Te2(byte(t0, 1)) ^
            Te3(byte(t1, 0)) ^
            rk[2];
        s3 =
            Te0(byte(t3, 3)) ^
            Te1(byte(t0, 2)) ^
            Te2(byte(t1, 1)) ^
            Te3(byte(t2, 0)) ^
            rk[3];
    }
 
    s0 =
        (Te4_3[byte(t0, 3)]) ^
        (Te4_2[byte(t1, 2)]) ^
        (Te4_1[byte(t2, 1)]) ^
        (Te4_0[byte(t3, 0)]) ^
        rk[0];
    STORE32H(s0, ct);
    s1 =
        (Te4_3[byte(t1, 3)]) ^
        (Te4_2[byte(t2, 2)]) ^
        (Te4_1[byte(t3, 1)]) ^
        (Te4_0[byte(t0, 0)]) ^
        rk[1];
    STORE32H(s1, ct+4);
    s2 =
        (Te4_3[byte(t2, 3)]) ^
        (Te4_2[byte(t3, 2)]) ^
        (Te4_1[byte(t0, 1)]) ^
        (Te4_0[byte(t1, 0)]) ^
        rk[2];
    STORE32H(s2, ct+8);
    s3 =
        (Te4_3[byte(t3, 3)]) ^
        (Te4_2[byte(t0, 2)]) ^
        (Te4_1[byte(t1, 1)]) ^
        (Te4_0[byte(t2, 0)]) ^
        rk[3];
    STORE32H(s3, ct+12);
}

Referenced by encrypt_block_impl(), and KsecEncryptMemoryAes().

◆ aes_setup()

int aes_setup	(	const unsigned char *	key,
		int	keylen,
		int	rounds,
		aes_key *	skey
	)

Definition at line 937 of file aes.c.

{
    int i, j;
    ulong32 temp, *rk;
    ulong32 *rrk;
 
    if (keylen != 16 && keylen != 24 && keylen != 32) {
       return CRYPT_INVALID_KEYSIZE;
    }
 
    if (rounds != 0 && rounds != (10 + ((keylen/8)-2)*2)) {
       return CRYPT_INVALID_ROUNDS;
    }
 
    skey->Nr = 10 + ((keylen/8)-2)*2;
 
    /* setup the forward key */
    i                 = 0;
    rk                = skey->eK;
    LOAD32H(rk[0], key     );
    LOAD32H(rk[1], key +  4);
    LOAD32H(rk[2], key +  8);
    LOAD32H(rk[3], key + 12);
    if (keylen == 16) {
        j = 44;
        for (;;) {
            temp  = rk[3];
            rk[4] = rk[0] ^ setup_mix(temp) ^ rcon[i];
            rk[5] = rk[1] ^ rk[4];
            rk[6] = rk[2] ^ rk[5];
            rk[7] = rk[3] ^ rk[6];
            if (++i == 10) {
               break;
            }
            rk += 4;
        }
    } else if (keylen == 24) {
        j = 52;
        LOAD32H(rk[4], key + 16);
        LOAD32H(rk[5], key + 20);
        for (;;) {
            temp = rk[5];
            rk[ 6] = rk[ 0] ^ setup_mix(temp) ^ rcon[i];
            rk[ 7] = rk[ 1] ^ rk[ 6];
            rk[ 8] = rk[ 2] ^ rk[ 7];
            rk[ 9] = rk[ 3] ^ rk[ 8];
            if (++i == 8) {
                break;
            }
            rk[10] = rk[ 4] ^ rk[ 9];
            rk[11] = rk[ 5] ^ rk[10];
            rk += 6;
        }
    } else if (keylen == 32) {
        j = 60;
        LOAD32H(rk[4], key + 16);
        LOAD32H(rk[5], key + 20);
        LOAD32H(rk[6], key + 24);
        LOAD32H(rk[7], key + 28);
        for (;;) {
            temp = rk[7];
            rk[ 8] = rk[ 0] ^ setup_mix(temp) ^ rcon[i];
            rk[ 9] = rk[ 1] ^ rk[ 8];
            rk[10] = rk[ 2] ^ rk[ 9];
            rk[11] = rk[ 3] ^ rk[10];
            if (++i == 7) {
                break;
            }
            temp = rk[11];
            rk[12] = rk[ 4] ^ setup_mix(ROR(temp, 8));
            rk[13] = rk[ 5] ^ rk[12];
            rk[14] = rk[ 6] ^ rk[13];
            rk[15] = rk[ 7] ^ rk[14];
            rk += 8;
        }
    } else {
       j = 4;
    }
 
    rk   = skey->dK;
    rrk  = skey->eK + j - 4;
 
    *rk++ = *rrk++;
    *rk++ = *rrk++;
    *rk++ = *rrk++;
    *rk   = *rrk;
    rk -= 3; rrk -= 3;
 
    for (i = 1; i < skey->Nr; i++) {
        rrk -= 4;
        rk  += 4;
        temp = rrk[0];
        rk[0] =
            Tks0[byte(temp, 3)] ^
            Tks1[byte(temp, 2)] ^
            Tks2[byte(temp, 1)] ^
            Tks3[byte(temp, 0)];
        temp = rrk[1];
        rk[1] =
            Tks0[byte(temp, 3)] ^
            Tks1[byte(temp, 2)] ^
            Tks2[byte(temp, 1)] ^
            Tks3[byte(temp, 0)];
        temp = rrk[2];
        rk[2] =
            Tks0[byte(temp, 3)] ^
            Tks1[byte(temp, 2)] ^
            Tks2[byte(temp, 1)] ^
            Tks3[byte(temp, 0)];
        temp = rrk[3];
        rk[3] =
            Tks0[byte(temp, 3)] ^
            Tks1[byte(temp, 2)] ^
            Tks2[byte(temp, 1)] ^
            Tks3[byte(temp, 0)];
    }
 
    rrk -= 4;
    rk  += 4;
    *rk++ = *rrk++;
    *rk++ = *rrk++;
    *rk++ = *rrk++;
    *rk   = *rrk;
 
    return CRYPT_OK;
}

Referenced by KsecGetAesKey(), KsecInitializeEncryptionSupport(), and setup_key_impl().

◆ setup_mix()

static ulong32 setup_mix ( ulong32 temp )

static

Definition at line 929 of file aes.c.

{
   return (Te4_3[byte(temp, 2)]) ^
          (Te4_2[byte(temp, 1)]) ^
          (Te4_1[byte(temp, 0)]) ^
          (Te4_0[byte(temp, 3)]);
}

Referenced by aes_setup().

Variable Documentation

◆ rcon

const ulong32 rcon[]

static

Initial value:

= {
    0x01000000UL, 0x02000000UL, 0x04000000UL, 0x08000000UL,
    0x10000000UL, 0x20000000UL, 0x40000000UL, 0x80000000UL,
    0x1B000000UL, 0x36000000UL
}

Definition at line 923 of file aes.c.

Referenced by aes_setup(), and rijndaelKeySched().