| /* |
| * aesce-ccm-core.S - AES-CCM transform for ARMv8 with Crypto Extensions |
| * |
| * Copyright (C) 2013 - 2017 Linaro Ltd <ard.biesheuvel@linaro.org> |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License version 2 as |
| * published by the Free Software Foundation. |
| */ |
| |
| #include <linux/linkage.h> |
| #include <asm/assembler.h> |
| |
| .text |
| .arch armv8-a+crypto |
| |
| /* |
| * void ce_aes_ccm_auth_data(u8 mac[], u8 const in[], u32 abytes, |
| * u32 *macp, u8 const rk[], u32 rounds); |
| */ |
| ENTRY(ce_aes_ccm_auth_data) |
| ldr w8, [x3] /* leftover from prev round? */ |
| ld1 {v0.16b}, [x0] /* load mac */ |
| cbz w8, 1f |
| sub w8, w8, #16 |
| eor v1.16b, v1.16b, v1.16b |
| 0: ldrb w7, [x1], #1 /* get 1 byte of input */ |
| subs w2, w2, #1 |
| add w8, w8, #1 |
| ins v1.b[0], w7 |
| ext v1.16b, v1.16b, v1.16b, #1 /* rotate in the input bytes */ |
| beq 8f /* out of input? */ |
| cbnz w8, 0b |
| eor v0.16b, v0.16b, v1.16b |
| 1: ld1 {v3.4s}, [x4] /* load first round key */ |
| prfm pldl1strm, [x1] |
| cmp w5, #12 /* which key size? */ |
| add x6, x4, #16 |
| sub w7, w5, #2 /* modified # of rounds */ |
| bmi 2f |
| bne 5f |
| mov v5.16b, v3.16b |
| b 4f |
| 2: mov v4.16b, v3.16b |
| ld1 {v5.4s}, [x6], #16 /* load 2nd round key */ |
| 3: aese v0.16b, v4.16b |
| aesmc v0.16b, v0.16b |
| 4: ld1 {v3.4s}, [x6], #16 /* load next round key */ |
| aese v0.16b, v5.16b |
| aesmc v0.16b, v0.16b |
| 5: ld1 {v4.4s}, [x6], #16 /* load next round key */ |
| subs w7, w7, #3 |
| aese v0.16b, v3.16b |
| aesmc v0.16b, v0.16b |
| ld1 {v5.4s}, [x6], #16 /* load next round key */ |
| bpl 3b |
| aese v0.16b, v4.16b |
| subs w2, w2, #16 /* last data? */ |
| eor v0.16b, v0.16b, v5.16b /* final round */ |
| bmi 6f |
| ld1 {v1.16b}, [x1], #16 /* load next input block */ |
| eor v0.16b, v0.16b, v1.16b /* xor with mac */ |
| bne 1b |
| 6: st1 {v0.16b}, [x0] /* store mac */ |
| beq 10f |
| adds w2, w2, #16 |
| beq 10f |
| mov w8, w2 |
| 7: ldrb w7, [x1], #1 |
| umov w6, v0.b[0] |
| eor w6, w6, w7 |
| strb w6, [x0], #1 |
| subs w2, w2, #1 |
| beq 10f |
| ext v0.16b, v0.16b, v0.16b, #1 /* rotate out the mac bytes */ |
| b 7b |
| 8: cbz w8, 91f |
| mov w7, w8 |
| add w8, w8, #16 |
| 9: ext v1.16b, v1.16b, v1.16b, #1 |
| adds w7, w7, #1 |
| bne 9b |
| 91: eor v0.16b, v0.16b, v1.16b |
| st1 {v0.16b}, [x0] |
| 10: str w8, [x3] |
| ret |
| ENDPROC(ce_aes_ccm_auth_data) |
| |
| /* |
| * void ce_aes_ccm_final(u8 mac[], u8 const ctr[], u8 const rk[], |
| * u32 rounds); |
| */ |
| ENTRY(ce_aes_ccm_final) |
| ld1 {v3.4s}, [x2], #16 /* load first round key */ |
| ld1 {v0.16b}, [x0] /* load mac */ |
| cmp w3, #12 /* which key size? */ |
| sub w3, w3, #2 /* modified # of rounds */ |
| ld1 {v1.16b}, [x1] /* load 1st ctriv */ |
| bmi 0f |
| bne 3f |
| mov v5.16b, v3.16b |
| b 2f |
| 0: mov v4.16b, v3.16b |
| 1: ld1 {v5.4s}, [x2], #16 /* load next round key */ |
| aese v0.16b, v4.16b |
| aesmc v0.16b, v0.16b |
| aese v1.16b, v4.16b |
| aesmc v1.16b, v1.16b |
| 2: ld1 {v3.4s}, [x2], #16 /* load next round key */ |
| aese v0.16b, v5.16b |
| aesmc v0.16b, v0.16b |
| aese v1.16b, v5.16b |
| aesmc v1.16b, v1.16b |
| 3: ld1 {v4.4s}, [x2], #16 /* load next round key */ |
| subs w3, w3, #3 |
| aese v0.16b, v3.16b |
| aesmc v0.16b, v0.16b |
| aese v1.16b, v3.16b |
| aesmc v1.16b, v1.16b |
| bpl 1b |
| aese v0.16b, v4.16b |
| aese v1.16b, v4.16b |
| /* final round key cancels out */ |
| eor v0.16b, v0.16b, v1.16b /* en-/decrypt the mac */ |
| st1 {v0.16b}, [x0] /* store result */ |
| ret |
| ENDPROC(ce_aes_ccm_final) |
| |
| .macro aes_ccm_do_crypt,enc |
| ldr x8, [x6, #8] /* load lower ctr */ |
| ld1 {v0.16b}, [x5] /* load mac */ |
| CPU_LE( rev x8, x8 ) /* keep swabbed ctr in reg */ |
| 0: /* outer loop */ |
| ld1 {v1.8b}, [x6] /* load upper ctr */ |
| prfm pldl1strm, [x1] |
| add x8, x8, #1 |
| rev x9, x8 |
| cmp w4, #12 /* which key size? */ |
| sub w7, w4, #2 /* get modified # of rounds */ |
| ins v1.d[1], x9 /* no carry in lower ctr */ |
| ld1 {v3.4s}, [x3] /* load first round key */ |
| add x10, x3, #16 |
| bmi 1f |
| bne 4f |
| mov v5.16b, v3.16b |
| b 3f |
| 1: mov v4.16b, v3.16b |
| ld1 {v5.4s}, [x10], #16 /* load 2nd round key */ |
| 2: /* inner loop: 3 rounds, 2x interleaved */ |
| aese v0.16b, v4.16b |
| aesmc v0.16b, v0.16b |
| aese v1.16b, v4.16b |
| aesmc v1.16b, v1.16b |
| 3: ld1 {v3.4s}, [x10], #16 /* load next round key */ |
| aese v0.16b, v5.16b |
| aesmc v0.16b, v0.16b |
| aese v1.16b, v5.16b |
| aesmc v1.16b, v1.16b |
| 4: ld1 {v4.4s}, [x10], #16 /* load next round key */ |
| subs w7, w7, #3 |
| aese v0.16b, v3.16b |
| aesmc v0.16b, v0.16b |
| aese v1.16b, v3.16b |
| aesmc v1.16b, v1.16b |
| ld1 {v5.4s}, [x10], #16 /* load next round key */ |
| bpl 2b |
| aese v0.16b, v4.16b |
| aese v1.16b, v4.16b |
| subs w2, w2, #16 |
| bmi 6f /* partial block? */ |
| ld1 {v2.16b}, [x1], #16 /* load next input block */ |
| .if \enc == 1 |
| eor v2.16b, v2.16b, v5.16b /* final round enc+mac */ |
| eor v1.16b, v1.16b, v2.16b /* xor with crypted ctr */ |
| .else |
| eor v2.16b, v2.16b, v1.16b /* xor with crypted ctr */ |
| eor v1.16b, v2.16b, v5.16b /* final round enc */ |
| .endif |
| eor v0.16b, v0.16b, v2.16b /* xor mac with pt ^ rk[last] */ |
| st1 {v1.16b}, [x0], #16 /* write output block */ |
| bne 0b |
| CPU_LE( rev x8, x8 ) |
| st1 {v0.16b}, [x5] /* store mac */ |
| str x8, [x6, #8] /* store lsb end of ctr (BE) */ |
| 5: ret |
| |
| 6: eor v0.16b, v0.16b, v5.16b /* final round mac */ |
| eor v1.16b, v1.16b, v5.16b /* final round enc */ |
| st1 {v0.16b}, [x5] /* store mac */ |
| add w2, w2, #16 /* process partial tail block */ |
| 7: ldrb w9, [x1], #1 /* get 1 byte of input */ |
| umov w6, v1.b[0] /* get top crypted ctr byte */ |
| umov w7, v0.b[0] /* get top mac byte */ |
| .if \enc == 1 |
| eor w7, w7, w9 |
| eor w9, w9, w6 |
| .else |
| eor w9, w9, w6 |
| eor w7, w7, w9 |
| .endif |
| strb w9, [x0], #1 /* store out byte */ |
| strb w7, [x5], #1 /* store mac byte */ |
| subs w2, w2, #1 |
| beq 5b |
| ext v0.16b, v0.16b, v0.16b, #1 /* shift out mac byte */ |
| ext v1.16b, v1.16b, v1.16b, #1 /* shift out ctr byte */ |
| b 7b |
| .endm |
| |
| /* |
| * void ce_aes_ccm_encrypt(u8 out[], u8 const in[], u32 cbytes, |
| * u8 const rk[], u32 rounds, u8 mac[], |
| * u8 ctr[]); |
| * void ce_aes_ccm_decrypt(u8 out[], u8 const in[], u32 cbytes, |
| * u8 const rk[], u32 rounds, u8 mac[], |
| * u8 ctr[]); |
| */ |
| ENTRY(ce_aes_ccm_encrypt) |
| aes_ccm_do_crypt 1 |
| ENDPROC(ce_aes_ccm_encrypt) |
| |
| ENTRY(ce_aes_ccm_decrypt) |
| aes_ccm_do_crypt 0 |
| ENDPROC(ce_aes_ccm_decrypt) |
