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+/*
+ * Key handling functions for PPC AES implementation
+ *
+ * Copyright (c) 2015 Markus Stockhausen <stockhausen@collogia.de>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the Free
+ * Software Foundation; either version 2 of the License, or (at your option)
+ * any later version.
+ *
+ */
+
+#include <asm/ppc_asm.h>
+
+#ifdef __BIG_ENDIAN__
+#define LOAD_KEY(d, s, off) \
+ lwz d,off(s);
+#else
+#define LOAD_KEY(d, s, off) \
+ li r0,off; \
+ lwbrx d,s,r0;
+#endif
+
+#define INITIALIZE_KEY \
+ stwu r1,-32(r1); /* create stack frame */ \
+ stw r14,8(r1); /* save registers */ \
+ stw r15,12(r1); \
+ stw r16,16(r1);
+
+#define FINALIZE_KEY \
+ lwz r14,8(r1); /* restore registers */ \
+ lwz r15,12(r1); \
+ lwz r16,16(r1); \
+ xor r5,r5,r5; /* clear sensitive data */ \
+ xor r6,r6,r6; \
+ xor r7,r7,r7; \
+ xor r8,r8,r8; \
+ xor r9,r9,r9; \
+ xor r10,r10,r10; \
+ xor r11,r11,r11; \
+ xor r12,r12,r12; \
+ addi r1,r1,32; /* cleanup stack */
+
+#define LS_BOX(r, t1, t2) \
+ lis t2,PPC_AES_4K_ENCTAB@h; \
+ ori t2,t2,PPC_AES_4K_ENCTAB@l; \
+ rlwimi t2,r,4,20,27; \
+ lbz t1,8(t2); \
+ rlwimi r,t1,0,24,31; \
+ rlwimi t2,r,28,20,27; \
+ lbz t1,8(t2); \
+ rlwimi r,t1,8,16,23; \
+ rlwimi t2,r,20,20,27; \
+ lbz t1,8(t2); \
+ rlwimi r,t1,16,8,15; \
+ rlwimi t2,r,12,20,27; \
+ lbz t1,8(t2); \
+ rlwimi r,t1,24,0,7;
+
+#define GF8_MUL(out, in, t1, t2) \
+ lis t1,0x8080; /* multiplication in GF8 */ \
+ ori t1,t1,0x8080; \
+ and t1,t1,in; \
+ srwi t1,t1,7; \
+ mulli t1,t1,0x1b; \
+ lis t2,0x7f7f; \
+ ori t2,t2,0x7f7f; \
+ and t2,t2,in; \
+ slwi t2,t2,1; \
+ xor out,t1,t2;
+
+/*
+ * ppc_expand_key_128(u32 *key_enc, const u8 *key)
+ *
+ * Expand 128 bit key into 176 bytes encryption key. It consists of
+ * key itself plus 10 rounds with 16 bytes each
+ *
+ */
+_GLOBAL(ppc_expand_key_128)
+ INITIALIZE_KEY
+ LOAD_KEY(r5,r4,0)
+ LOAD_KEY(r6,r4,4)
+ LOAD_KEY(r7,r4,8)
+ LOAD_KEY(r8,r4,12)
+ stw r5,0(r3) /* key[0..3] = input data */
+ stw r6,4(r3)
+ stw r7,8(r3)
+ stw r8,12(r3)
+ li r16,10 /* 10 expansion rounds */
+ lis r0,0x0100 /* RCO(1) */
+ppc_expand_128_loop:
+ addi r3,r3,16
+ mr r14,r8 /* apply LS_BOX to 4th temp */
+ rotlwi r14,r14,8
+ LS_BOX(r14, r15, r4)
+ xor r14,r14,r0
+ xor r5,r5,r14 /* xor next 4 keys */
+ xor r6,r6,r5
+ xor r7,r7,r6
+ xor r8,r8,r7
+ stw r5,0(r3) /* store next 4 keys */
+ stw r6,4(r3)
+ stw r7,8(r3)
+ stw r8,12(r3)
+ GF8_MUL(r0, r0, r4, r14) /* multiply RCO by 2 in GF */
+ subi r16,r16,1
+ cmpwi r16,0
+ bt eq,ppc_expand_128_end
+ b ppc_expand_128_loop
+ppc_expand_128_end:
+ FINALIZE_KEY
+ blr
+
+/*
+ * ppc_expand_key_192(u32 *key_enc, const u8 *key)
+ *
+ * Expand 192 bit key into 208 bytes encryption key. It consists of key
+ * itself plus 12 rounds with 16 bytes each
+ *
+ */
+_GLOBAL(ppc_expand_key_192)
+ INITIALIZE_KEY
+ LOAD_KEY(r5,r4,0)
+ LOAD_KEY(r6,r4,4)
+ LOAD_KEY(r7,r4,8)
+ LOAD_KEY(r8,r4,12)
+ LOAD_KEY(r9,r4,16)
+ LOAD_KEY(r10,r4,20)
+ stw r5,0(r3)
+ stw r6,4(r3)
+ stw r7,8(r3)
+ stw r8,12(r3)
+ stw r9,16(r3)
+ stw r10,20(r3)
+ li r16,8 /* 8 expansion rounds */
+ lis r0,0x0100 /* RCO(1) */
+ppc_expand_192_loop:
+ addi r3,r3,24
+ mr r14,r10 /* apply LS_BOX to 6th temp */
+ rotlwi r14,r14,8
+ LS_BOX(r14, r15, r4)
+ xor r14,r14,r0
+ xor r5,r5,r14 /* xor next 6 keys */
+ xor r6,r6,r5
+ xor r7,r7,r6
+ xor r8,r8,r7
+ xor r9,r9,r8
+ xor r10,r10,r9
+ stw r5,0(r3)
+ stw r6,4(r3)
+ stw r7,8(r3)
+ stw r8,12(r3)
+ subi r16,r16,1
+ cmpwi r16,0 /* last round early kick out */
+ bt eq,ppc_expand_192_end
+ stw r9,16(r3)
+ stw r10,20(r3)
+ GF8_MUL(r0, r0, r4, r14) /* multiply RCO GF8 */
+ b ppc_expand_192_loop
+ppc_expand_192_end:
+ FINALIZE_KEY
+ blr
+
+/*
+ * ppc_expand_key_256(u32 *key_enc, const u8 *key)
+ *
+ * Expand 256 bit key into 240 bytes encryption key. It consists of key
+ * itself plus 14 rounds with 16 bytes each
+ *
+ */
+_GLOBAL(ppc_expand_key_256)
+ INITIALIZE_KEY
+ LOAD_KEY(r5,r4,0)
+ LOAD_KEY(r6,r4,4)
+ LOAD_KEY(r7,r4,8)
+ LOAD_KEY(r8,r4,12)
+ LOAD_KEY(r9,r4,16)
+ LOAD_KEY(r10,r4,20)
+ LOAD_KEY(r11,r4,24)
+ LOAD_KEY(r12,r4,28)
+ stw r5,0(r3)
+ stw r6,4(r3)
+ stw r7,8(r3)
+ stw r8,12(r3)
+ stw r9,16(r3)
+ stw r10,20(r3)
+ stw r11,24(r3)
+ stw r12,28(r3)
+ li r16,7 /* 7 expansion rounds */
+ lis r0,0x0100 /* RCO(1) */
+ppc_expand_256_loop:
+ addi r3,r3,32
+ mr r14,r12 /* apply LS_BOX to 8th temp */
+ rotlwi r14,r14,8
+ LS_BOX(r14, r15, r4)
+ xor r14,r14,r0
+ xor r5,r5,r14 /* xor 4 keys */
+ xor r6,r6,r5
+ xor r7,r7,r6
+ xor r8,r8,r7
+ mr r14,r8
+ LS_BOX(r14, r15, r4) /* apply LS_BOX to 4th temp */
+ xor r9,r9,r14 /* xor 4 keys */
+ xor r10,r10,r9
+ xor r11,r11,r10
+ xor r12,r12,r11
+ stw r5,0(r3)
+ stw r6,4(r3)
+ stw r7,8(r3)
+ stw r8,12(r3)
+ subi r16,r16,1
+ cmpwi r16,0 /* last round early kick out */
+ bt eq,ppc_expand_256_end
+ stw r9,16(r3)
+ stw r10,20(r3)
+ stw r11,24(r3)
+ stw r12,28(r3)
+ GF8_MUL(r0, r0, r4, r14)
+ b ppc_expand_256_loop
+ppc_expand_256_end:
+ FINALIZE_KEY
+ blr
+
+/*
+ * ppc_generate_decrypt_key: derive decryption key from encryption key
+ * number of bytes to handle are calculated from length of key (16/24/32)
+ *
+ */
+_GLOBAL(ppc_generate_decrypt_key)
+ addi r6,r5,24
+ slwi r6,r6,2
+ lwzx r7,r4,r6 /* first/last 4 words are same */
+ stw r7,0(r3)
+ lwz r7,0(r4)
+ stwx r7,r3,r6
+ addi r6,r6,4
+ lwzx r7,r4,r6
+ stw r7,4(r3)
+ lwz r7,4(r4)
+ stwx r7,r3,r6
+ addi r6,r6,4
+ lwzx r7,r4,r6
+ stw r7,8(r3)
+ lwz r7,8(r4)
+ stwx r7,r3,r6
+ addi r6,r6,4
+ lwzx r7,r4,r6
+ stw r7,12(r3)
+ lwz r7,12(r4)
+ stwx r7,r3,r6
+ addi r3,r3,16
+ add r4,r4,r6
+ subi r4,r4,28
+ addi r5,r5,20
+ srwi r5,r5,2
+ppc_generate_decrypt_block:
+ li r6,4
+ mtctr r6
+ppc_generate_decrypt_word:
+ lwz r6,0(r4)
+ GF8_MUL(r7, r6, r0, r7)
+ GF8_MUL(r8, r7, r0, r8)
+ GF8_MUL(r9, r8, r0, r9)
+ xor r10,r9,r6
+ xor r11,r7,r8
+ xor r11,r11,r9
+ xor r12,r7,r10
+ rotrwi r12,r12,24
+ xor r11,r11,r12
+ xor r12,r8,r10
+ rotrwi r12,r12,16
+ xor r11,r11,r12
+ rotrwi r12,r10,8
+ xor r11,r11,r12
+ stw r11,0(r3)
+ addi r3,r3,4
+ addi r4,r4,4
+ bdnz ppc_generate_decrypt_word
+ subi r4,r4,32
+ subi r5,r5,1
+ cmpwi r5,0
+ bt gt,ppc_generate_decrypt_block
+ blr
[PATCH v1 4/7] AES for PPC/SPE - key handling Key generation for big endian core routines. Signed-off-by: Markus Stockhausen <stockhausen@collogia.de> **************************************************************************** Diese E-Mail enthält vertrauliche und/oder rechtlich geschützte Informationen. Wenn Sie nicht der richtige Adressat sind oder diese E-Mail irrtümlich erhalten haben, informieren Sie bitte sofort den Absender und vernichten Sie diese Mail. Das unerlaubte Kopieren sowie die unbefugte Weitergabe dieser Mail ist nicht gestattet. Über das Internet versandte E-Mails können unter fremden Namen erstellt oder manipuliert werden. Deshalb ist diese als E-Mail verschickte Nachricht keine rechtsverbindliche Willenserklärung. Collogia Unternehmensberatung AG Ubierring 11 D-50678 Köln Vorstand: Kadir Akin Dr. Michael Höhnerbach Vorsitzender des Aufsichtsrates: Hans Kristian Langva Registergericht: Amtsgericht Köln Registernummer: HRB 52 497 This e-mail may contain confidential and/or privileged information. If you are not the intended recipient (or have received this e-mail in error) please notify the sender immediately and destroy this e-mail. Any unauthorized copying, disclosure or distribution of the material in this e-mail is strictly forbidden. e-mails sent over the internet may have been written under a wrong name or been manipulated. That is why this message sent as an e-mail is not a legally binding declaration of intention. Collogia Unternehmensberatung AG Ubierring 11 D-50678 Köln executive board: Kadir Akin Dr. Michael Höhnerbach President of the supervisory board: Hans Kristian Langva Registry office: district court Cologne Register number: HRB 52 497 ****************************************************************************