arm64/crypto: AES in CCM mode using ARMv8 Crypto Extensions
This patch adds support for the AES-CCM encryption algorithm for CPUs that have support for the AES part of the ARM v8 Crypto Extensions. Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> Acked-by: Herbert Xu <herbert@gondor.apana.org.au>hifive-unleashed-5.1
Ard Biesheuvel
parent
317f2f750d
commit
a3fd82105b
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@ -29,4 +29,11 @@ config CRYPTO_AES_ARM64_CE
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select CRYPTO_ALGAPI
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select CRYPTO_AES
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config CRYPTO_AES_ARM64_CE_CCM
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tristate "AES in CCM mode using ARMv8 Crypto Extensions"
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depends on ARM64 && KERNEL_MODE_NEON
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select CRYPTO_ALGAPI
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select CRYPTO_AES
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select CRYPTO_AEAD
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endif
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@ -19,3 +19,6 @@ ghash-ce-y := ghash-ce-glue.o ghash-ce-core.o
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obj-$(CONFIG_CRYPTO_AES_ARM64_CE) += aes-ce-cipher.o
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CFLAGS_aes-ce-cipher.o += -march=armv8-a+crypto
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obj-$(CONFIG_CRYPTO_AES_ARM64_CE_CCM) += aes-ce-ccm.o
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aes-ce-ccm-y := aes-ce-ccm-glue.o aes-ce-ccm-core.o
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@ -0,0 +1,222 @@
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/*
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* aesce-ccm-core.S - AES-CCM transform for ARMv8 with Crypto Extensions
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*
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* Copyright (C) 2013 - 2014 Linaro Ltd <ard.biesheuvel@linaro.org>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/linkage.h>
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.text
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.arch armv8-a+crypto
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/*
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* void ce_aes_ccm_auth_data(u8 mac[], u8 const in[], u32 abytes,
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* u32 *macp, u8 const rk[], u32 rounds);
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*/
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ENTRY(ce_aes_ccm_auth_data)
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ldr w8, [x3] /* leftover from prev round? */
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ld1 {v0.2d}, [x0] /* load mac */
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cbz w8, 1f
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sub w8, w8, #16
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eor v1.16b, v1.16b, v1.16b
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0: ldrb w7, [x1], #1 /* get 1 byte of input */
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subs w2, w2, #1
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add w8, w8, #1
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ins v1.b[0], w7
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ext v1.16b, v1.16b, v1.16b, #1 /* rotate in the input bytes */
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beq 8f /* out of input? */
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cbnz w8, 0b
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eor v0.16b, v0.16b, v1.16b
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1: ld1 {v3.2d}, [x4] /* load first round key */
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prfm pldl1strm, [x1]
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cmp w5, #12 /* which key size? */
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add x6, x4, #16
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sub w7, w5, #2 /* modified # of rounds */
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bmi 2f
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bne 5f
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mov v5.16b, v3.16b
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b 4f
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2: mov v4.16b, v3.16b
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ld1 {v5.2d}, [x6], #16 /* load 2nd round key */
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3: aese v0.16b, v4.16b
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aesmc v0.16b, v0.16b
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4: ld1 {v3.2d}, [x6], #16 /* load next round key */
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aese v0.16b, v5.16b
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aesmc v0.16b, v0.16b
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5: ld1 {v4.2d}, [x6], #16 /* load next round key */
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subs w7, w7, #3
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aese v0.16b, v3.16b
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aesmc v0.16b, v0.16b
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ld1 {v5.2d}, [x6], #16 /* load next round key */
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bpl 3b
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aese v0.16b, v4.16b
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subs w2, w2, #16 /* last data? */
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eor v0.16b, v0.16b, v5.16b /* final round */
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bmi 6f
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ld1 {v1.16b}, [x1], #16 /* load next input block */
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eor v0.16b, v0.16b, v1.16b /* xor with mac */
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bne 1b
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6: st1 {v0.2d}, [x0] /* store mac */
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beq 10f
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adds w2, w2, #16
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beq 10f
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mov w8, w2
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7: ldrb w7, [x1], #1
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umov w6, v0.b[0]
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eor w6, w6, w7
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strb w6, [x0], #1
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subs w2, w2, #1
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beq 10f
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ext v0.16b, v0.16b, v0.16b, #1 /* rotate out the mac bytes */
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b 7b
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8: mov w7, w8
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add w8, w8, #16
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9: ext v1.16b, v1.16b, v1.16b, #1
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adds w7, w7, #1
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bne 9b
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eor v0.16b, v0.16b, v1.16b
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st1 {v0.2d}, [x0]
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10: str w8, [x3]
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ret
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ENDPROC(ce_aes_ccm_auth_data)
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/*
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* void ce_aes_ccm_final(u8 mac[], u8 const ctr[], u8 const rk[],
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* u32 rounds);
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*/
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ENTRY(ce_aes_ccm_final)
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ld1 {v3.2d}, [x2], #16 /* load first round key */
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ld1 {v0.2d}, [x0] /* load mac */
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cmp w3, #12 /* which key size? */
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sub w3, w3, #2 /* modified # of rounds */
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ld1 {v1.2d}, [x1] /* load 1st ctriv */
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bmi 0f
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bne 3f
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mov v5.16b, v3.16b
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b 2f
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0: mov v4.16b, v3.16b
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1: ld1 {v5.2d}, [x2], #16 /* load next round key */
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aese v0.16b, v4.16b
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aese v1.16b, v4.16b
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aesmc v0.16b, v0.16b
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aesmc v1.16b, v1.16b
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2: ld1 {v3.2d}, [x2], #16 /* load next round key */
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aese v0.16b, v5.16b
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aese v1.16b, v5.16b
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aesmc v0.16b, v0.16b
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aesmc v1.16b, v1.16b
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3: ld1 {v4.2d}, [x2], #16 /* load next round key */
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subs w3, w3, #3
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aese v0.16b, v3.16b
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aese v1.16b, v3.16b
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aesmc v0.16b, v0.16b
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aesmc v1.16b, v1.16b
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bpl 1b
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aese v0.16b, v4.16b
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aese v1.16b, v4.16b
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/* final round key cancels out */
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eor v0.16b, v0.16b, v1.16b /* en-/decrypt the mac */
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st1 {v0.2d}, [x0] /* store result */
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ret
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ENDPROC(ce_aes_ccm_final)
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.macro aes_ccm_do_crypt,enc
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ldr x8, [x6, #8] /* load lower ctr */
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ld1 {v0.2d}, [x5] /* load mac */
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rev x8, x8 /* keep swabbed ctr in reg */
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0: /* outer loop */
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ld1 {v1.1d}, [x6] /* load upper ctr */
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prfm pldl1strm, [x1]
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add x8, x8, #1
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rev x9, x8
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cmp w4, #12 /* which key size? */
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sub w7, w4, #2 /* get modified # of rounds */
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ins v1.d[1], x9 /* no carry in lower ctr */
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ld1 {v3.2d}, [x3] /* load first round key */
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add x10, x3, #16
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bmi 1f
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bne 4f
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mov v5.16b, v3.16b
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b 3f
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1: mov v4.16b, v3.16b
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ld1 {v5.2d}, [x10], #16 /* load 2nd round key */
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2: /* inner loop: 3 rounds, 2x interleaved */
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aese v0.16b, v4.16b
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aese v1.16b, v4.16b
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aesmc v0.16b, v0.16b
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aesmc v1.16b, v1.16b
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3: ld1 {v3.2d}, [x10], #16 /* load next round key */
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aese v0.16b, v5.16b
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aese v1.16b, v5.16b
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aesmc v0.16b, v0.16b
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aesmc v1.16b, v1.16b
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4: ld1 {v4.2d}, [x10], #16 /* load next round key */
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subs w7, w7, #3
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aese v0.16b, v3.16b
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aese v1.16b, v3.16b
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aesmc v0.16b, v0.16b
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aesmc v1.16b, v1.16b
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ld1 {v5.2d}, [x10], #16 /* load next round key */
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bpl 2b
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aese v0.16b, v4.16b
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aese v1.16b, v4.16b
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subs w2, w2, #16
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bmi 6f /* partial block? */
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ld1 {v2.16b}, [x1], #16 /* load next input block */
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.if \enc == 1
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eor v2.16b, v2.16b, v5.16b /* final round enc+mac */
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eor v1.16b, v1.16b, v2.16b /* xor with crypted ctr */
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.else
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eor v2.16b, v2.16b, v1.16b /* xor with crypted ctr */
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eor v1.16b, v2.16b, v5.16b /* final round enc */
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.endif
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eor v0.16b, v0.16b, v2.16b /* xor mac with pt ^ rk[last] */
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st1 {v1.16b}, [x0], #16 /* write output block */
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bne 0b
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rev x8, x8
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st1 {v0.2d}, [x5] /* store mac */
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str x8, [x6, #8] /* store lsb end of ctr (BE) */
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5: ret
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6: eor v0.16b, v0.16b, v5.16b /* final round mac */
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eor v1.16b, v1.16b, v5.16b /* final round enc */
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st1 {v0.2d}, [x5] /* store mac */
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add w2, w2, #16 /* process partial tail block */
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7: ldrb w9, [x1], #1 /* get 1 byte of input */
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umov w6, v1.b[0] /* get top crypted ctr byte */
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umov w7, v0.b[0] /* get top mac byte */
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.if \enc == 1
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eor w7, w7, w9
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eor w9, w9, w6
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.else
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eor w9, w9, w6
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eor w7, w7, w9
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.endif
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strb w9, [x0], #1 /* store out byte */
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strb w7, [x5], #1 /* store mac byte */
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subs w2, w2, #1
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beq 5b
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ext v0.16b, v0.16b, v0.16b, #1 /* shift out mac byte */
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ext v1.16b, v1.16b, v1.16b, #1 /* shift out ctr byte */
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b 7b
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.endm
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/*
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* void ce_aes_ccm_encrypt(u8 out[], u8 const in[], u32 cbytes,
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* u8 const rk[], u32 rounds, u8 mac[],
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* u8 ctr[]);
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* void ce_aes_ccm_decrypt(u8 out[], u8 const in[], u32 cbytes,
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* u8 const rk[], u32 rounds, u8 mac[],
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* u8 ctr[]);
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*/
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ENTRY(ce_aes_ccm_encrypt)
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aes_ccm_do_crypt 1
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ENDPROC(ce_aes_ccm_encrypt)
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ENTRY(ce_aes_ccm_decrypt)
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aes_ccm_do_crypt 0
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ENDPROC(ce_aes_ccm_decrypt)
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@ -0,0 +1,297 @@
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/*
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* aes-ccm-glue.c - AES-CCM transform for ARMv8 with Crypto Extensions
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*
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* Copyright (C) 2013 - 2014 Linaro Ltd <ard.biesheuvel@linaro.org>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <asm/neon.h>
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#include <asm/unaligned.h>
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#include <crypto/aes.h>
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#include <crypto/algapi.h>
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#include <crypto/scatterwalk.h>
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#include <linux/crypto.h>
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#include <linux/module.h>
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static int num_rounds(struct crypto_aes_ctx *ctx)
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{
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/*
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* # of rounds specified by AES:
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* 128 bit key 10 rounds
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* 192 bit key 12 rounds
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* 256 bit key 14 rounds
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* => n byte key => 6 + (n/4) rounds
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*/
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return 6 + ctx->key_length / 4;
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}
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asmlinkage void ce_aes_ccm_auth_data(u8 mac[], u8 const in[], u32 abytes,
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u32 *macp, u32 const rk[], u32 rounds);
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asmlinkage void ce_aes_ccm_encrypt(u8 out[], u8 const in[], u32 cbytes,
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u32 const rk[], u32 rounds, u8 mac[],
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u8 ctr[]);
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asmlinkage void ce_aes_ccm_decrypt(u8 out[], u8 const in[], u32 cbytes,
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u32 const rk[], u32 rounds, u8 mac[],
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u8 ctr[]);
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asmlinkage void ce_aes_ccm_final(u8 mac[], u8 const ctr[], u32 const rk[],
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u32 rounds);
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static int ccm_setkey(struct crypto_aead *tfm, const u8 *in_key,
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unsigned int key_len)
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{
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struct crypto_aes_ctx *ctx = crypto_aead_ctx(tfm);
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int ret;
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ret = crypto_aes_expand_key(ctx, in_key, key_len);
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if (!ret)
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return 0;
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tfm->base.crt_flags |= CRYPTO_TFM_RES_BAD_KEY_LEN;
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return -EINVAL;
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}
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static int ccm_setauthsize(struct crypto_aead *tfm, unsigned int authsize)
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{
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if ((authsize & 1) || authsize < 4)
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return -EINVAL;
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return 0;
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}
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static int ccm_init_mac(struct aead_request *req, u8 maciv[], u32 msglen)
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{
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struct crypto_aead *aead = crypto_aead_reqtfm(req);
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__be32 *n = (__be32 *)&maciv[AES_BLOCK_SIZE - 8];
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u32 l = req->iv[0] + 1;
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/* verify that CCM dimension 'L' is set correctly in the IV */
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if (l < 2 || l > 8)
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return -EINVAL;
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/* verify that msglen can in fact be represented in L bytes */
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if (l < 4 && msglen >> (8 * l))
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return -EOVERFLOW;
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/*
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* Even if the CCM spec allows L values of up to 8, the Linux cryptoapi
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* uses a u32 type to represent msglen so the top 4 bytes are always 0.
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*/
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n[0] = 0;
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n[1] = cpu_to_be32(msglen);
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memcpy(maciv, req->iv, AES_BLOCK_SIZE - l);
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/*
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* Meaning of byte 0 according to CCM spec (RFC 3610/NIST 800-38C)
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* - bits 0..2 : max # of bytes required to represent msglen, minus 1
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* (already set by caller)
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* - bits 3..5 : size of auth tag (1 => 4 bytes, 2 => 6 bytes, etc)
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* - bit 6 : indicates presence of authenticate-only data
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*/
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maciv[0] |= (crypto_aead_authsize(aead) - 2) << 2;
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if (req->assoclen)
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maciv[0] |= 0x40;
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memset(&req->iv[AES_BLOCK_SIZE - l], 0, l);
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return 0;
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}
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static void ccm_calculate_auth_mac(struct aead_request *req, u8 mac[])
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{
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struct crypto_aead *aead = crypto_aead_reqtfm(req);
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struct crypto_aes_ctx *ctx = crypto_aead_ctx(aead);
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struct __packed { __be16 l; __be32 h; u16 len; } ltag;
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struct scatter_walk walk;
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u32 len = req->assoclen;
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u32 macp = 0;
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/* prepend the AAD with a length tag */
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if (len < 0xff00) {
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ltag.l = cpu_to_be16(len);
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ltag.len = 2;
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} else {
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ltag.l = cpu_to_be16(0xfffe);
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put_unaligned_be32(len, <ag.h);
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ltag.len = 6;
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}
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ce_aes_ccm_auth_data(mac, (u8 *)<ag, ltag.len, &macp, ctx->key_enc,
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num_rounds(ctx));
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scatterwalk_start(&walk, req->assoc);
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do {
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u32 n = scatterwalk_clamp(&walk, len);
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u8 *p;
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if (!n) {
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scatterwalk_start(&walk, sg_next(walk.sg));
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n = scatterwalk_clamp(&walk, len);
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}
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p = scatterwalk_map(&walk);
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ce_aes_ccm_auth_data(mac, p, n, &macp, ctx->key_enc,
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num_rounds(ctx));
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len -= n;
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scatterwalk_unmap(p);
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scatterwalk_advance(&walk, n);
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scatterwalk_done(&walk, 0, len);
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} while (len);
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}
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static int ccm_encrypt(struct aead_request *req)
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{
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struct crypto_aead *aead = crypto_aead_reqtfm(req);
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struct crypto_aes_ctx *ctx = crypto_aead_ctx(aead);
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struct blkcipher_desc desc = { .info = req->iv };
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struct blkcipher_walk walk;
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u8 __aligned(8) mac[AES_BLOCK_SIZE];
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u8 buf[AES_BLOCK_SIZE];
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u32 len = req->cryptlen;
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int err;
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err = ccm_init_mac(req, mac, len);
|
||||
if (err)
|
||||
return err;
|
||||
|
||||
kernel_neon_begin_partial(6);
|
||||
|
||||
if (req->assoclen)
|
||||
ccm_calculate_auth_mac(req, mac);
|
||||
|
||||
/* preserve the original iv for the final round */
|
||||
memcpy(buf, req->iv, AES_BLOCK_SIZE);
|
||||
|
||||
blkcipher_walk_init(&walk, req->dst, req->src, len);
|
||||
err = blkcipher_aead_walk_virt_block(&desc, &walk, aead,
|
||||
AES_BLOCK_SIZE);
|
||||
|
||||
while (walk.nbytes) {
|
||||
u32 tail = walk.nbytes % AES_BLOCK_SIZE;
|
||||
|
||||
if (walk.nbytes == len)
|
||||
tail = 0;
|
||||
|
||||
ce_aes_ccm_encrypt(walk.dst.virt.addr, walk.src.virt.addr,
|
||||
walk.nbytes - tail, ctx->key_enc,
|
||||
num_rounds(ctx), mac, walk.iv);
|
||||
|
||||
len -= walk.nbytes - tail;
|
||||
err = blkcipher_walk_done(&desc, &walk, tail);
|
||||
}
|
||||
if (!err)
|
||||
ce_aes_ccm_final(mac, buf, ctx->key_enc, num_rounds(ctx));
|
||||
|
||||
kernel_neon_end();
|
||||
|
||||
if (err)
|
||||
return err;
|
||||
|
||||
/* copy authtag to end of dst */
|
||||
scatterwalk_map_and_copy(mac, req->dst, req->cryptlen,
|
||||
crypto_aead_authsize(aead), 1);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int ccm_decrypt(struct aead_request *req)
|
||||
{
|
||||
struct crypto_aead *aead = crypto_aead_reqtfm(req);
|
||||
struct crypto_aes_ctx *ctx = crypto_aead_ctx(aead);
|
||||
unsigned int authsize = crypto_aead_authsize(aead);
|
||||
struct blkcipher_desc desc = { .info = req->iv };
|
||||
struct blkcipher_walk walk;
|
||||
u8 __aligned(8) mac[AES_BLOCK_SIZE];
|
||||
u8 buf[AES_BLOCK_SIZE];
|
||||
u32 len = req->cryptlen - authsize;
|
||||
int err;
|
||||
|
||||
err = ccm_init_mac(req, mac, len);
|
||||
if (err)
|
||||
return err;
|
||||
|
||||
kernel_neon_begin_partial(6);
|
||||
|
||||
if (req->assoclen)
|
||||
ccm_calculate_auth_mac(req, mac);
|
||||
|
||||
/* preserve the original iv for the final round */
|
||||
memcpy(buf, req->iv, AES_BLOCK_SIZE);
|
||||
|
||||
blkcipher_walk_init(&walk, req->dst, req->src, len);
|
||||
err = blkcipher_aead_walk_virt_block(&desc, &walk, aead,
|
||||
AES_BLOCK_SIZE);
|
||||
|
||||
while (walk.nbytes) {
|
||||
u32 tail = walk.nbytes % AES_BLOCK_SIZE;
|
||||
|
||||
if (walk.nbytes == len)
|
||||
tail = 0;
|
||||
|
||||
ce_aes_ccm_decrypt(walk.dst.virt.addr, walk.src.virt.addr,
|
||||
walk.nbytes - tail, ctx->key_enc,
|
||||
num_rounds(ctx), mac, walk.iv);
|
||||
|
||||
len -= walk.nbytes - tail;
|
||||
err = blkcipher_walk_done(&desc, &walk, tail);
|
||||
}
|
||||
if (!err)
|
||||
ce_aes_ccm_final(mac, buf, ctx->key_enc, num_rounds(ctx));
|
||||
|
||||
kernel_neon_end();
|
||||
|
||||
if (err)
|
||||
return err;
|
||||
|
||||
/* compare calculated auth tag with the stored one */
|
||||
scatterwalk_map_and_copy(buf, req->src, req->cryptlen - authsize,
|
||||
authsize, 0);
|
||||
|
||||
if (memcmp(mac, buf, authsize))
|
||||
return -EBADMSG;
|
||||
return 0;
|
||||
}
|
||||
|
||||
static struct crypto_alg ccm_aes_alg = {
|
||||
.cra_name = "ccm(aes)",
|
||||
.cra_driver_name = "ccm-aes-ce",
|
||||
.cra_priority = 300,
|
||||
.cra_flags = CRYPTO_ALG_TYPE_AEAD,
|
||||
.cra_blocksize = 1,
|
||||
.cra_ctxsize = sizeof(struct crypto_aes_ctx),
|
||||
.cra_alignmask = 7,
|
||||
.cra_type = &crypto_aead_type,
|
||||
.cra_module = THIS_MODULE,
|
||||
.cra_aead = {
|
||||
.ivsize = AES_BLOCK_SIZE,
|
||||
.maxauthsize = AES_BLOCK_SIZE,
|
||||
.setkey = ccm_setkey,
|
||||
.setauthsize = ccm_setauthsize,
|
||||
.encrypt = ccm_encrypt,
|
||||
.decrypt = ccm_decrypt,
|
||||
}
|
||||
};
|
||||
|
||||
static int __init aes_mod_init(void)
|
||||
{
|
||||
if (!(elf_hwcap & HWCAP_AES))
|
||||
return -ENODEV;
|
||||
return crypto_register_alg(&ccm_aes_alg);
|
||||
}
|
||||
|
||||
static void __exit aes_mod_exit(void)
|
||||
{
|
||||
crypto_unregister_alg(&ccm_aes_alg);
|
||||
}
|
||||
|
||||
module_init(aes_mod_init);
|
||||
module_exit(aes_mod_exit);
|
||||
|
||||
MODULE_DESCRIPTION("Synchronous AES in CCM mode using ARMv8 Crypto Extensions");
|
||||
MODULE_AUTHOR("Ard Biesheuvel <ard.biesheuvel@linaro.org>");
|
||||
MODULE_LICENSE("GPL v2");
|
||||
MODULE_ALIAS("ccm(aes)");
|
||||
Loading…
Reference in New Issue