diff options
Diffstat (limited to 'arm/aes.m4')
| -rw-r--r-- | arm/aes.m4 | 164 |
1 files changed, 164 insertions, 0 deletions
diff --git a/arm/aes.m4 b/arm/aes.m4 new file mode 100644 index 00000000..00d3c9a3 --- /dev/null +++ b/arm/aes.m4 @@ -0,0 +1,164 @@ +C Loads one word, and adds it to the subkey. Uses T0 +C AES_LOAD(SRC, KEY, REG) +define(<AES_LOAD>, < + ldrb $3, [$1], #+1 + ldrb T0, [$1], #+1 + orr $3, T0, lsl #8 + ldrb T0, [$1], #+1 + orr $3, T0, lsl #16 + ldrb T0, [$1], #+1 + orr $3, T0, lsl #24 + ldr T0, [$2], #+4 + eor $3, T0 +>) +C Stores one word. Destroys input. +C AES_STORE(DST, X) +define(<AES_STORE>, < + strb $2, [$1], #+1 + ror $2, $2, #8 + strb $2, [$1], #+1 + ror $2, $2, #8 + strb $2, [$1], #+1 + ror $2, $2, #8 + strb $2, [$1], #+1 +>) + +C 53 instr. +C It's tempting to use eor with rotation, but that's slower. +C AES_ENCRYPT_ROUND(x0,x1,x2,x3,w0,w1,w2,w3,key) +define(<AES_ENCRYPT_ROUND>, < + uxtb T0, $1 + ldr $5, [TABLE, T0, lsl #2] + uxtb T0, $2 + ldr $6, [TABLE, T0, lsl #2] + uxtb T0, $3 + ldr $7, [TABLE, T0, lsl #2] + uxtb T0, $4 + ldr $8, [TABLE, T0, lsl #2] + + uxtb T0, $2, ror #8 + add TABLE, TABLE, #1024 + ldr T0, [TABLE, T0, lsl #2] + eor $5, $5, T0 + uxtb T0, $3, ror #8 + ldr T0, [TABLE, T0, lsl #2] + eor $6, $6, T0 + uxtb T0, $4, ror #8 + ldr T0, [TABLE, T0, lsl #2] + eor $7, $7, T0 + uxtb T0, $1, ror #8 + ldr T0, [TABLE, T0, lsl #2] + eor $8, $8, T0 + + uxtb T0, $3, ror #16 + add TABLE, TABLE, #1024 + ldr T0, [TABLE, T0, lsl #2] + eor $5, $5, T0 + uxtb T0, $4, ror #16 + ldr T0, [TABLE, T0, lsl #2] + eor $6, $6, T0 + uxtb T0, $1, ror #16 + ldr T0, [TABLE, T0, lsl #2] + eor $7, $7, T0 + uxtb T0, $2, ror #16 + ldr T0, [TABLE, T0, lsl #2] + eor $8, $8, T0 + + uxtb T0, $4, ror #24 + add TABLE, TABLE, #1024 + ldr T0, [TABLE, T0, lsl #2] + eor $5, $5, T0 + uxtb T0, $1, ror #24 + ldr T0, [TABLE, T0, lsl #2] + eor $6, $6, T0 + uxtb T0, $2, ror #24 + ldr T0, [TABLE, T0, lsl #2] + eor $7, $7, T0 + uxtb T0, $3, ror #24 + ldr T0, [TABLE, T0, lsl #2] + + ldm $9!, {$1,$2,$3,$4} + eor $8, $8, T0 + sub TABLE, TABLE, #3072 + eor $5, $5, $1 + eor $6, $6, $2 + eor $7, $7, $3 + eor $8, $8, $4 +>) + +define(<AES_DECRYPT_ROUND>, < + uxtb T0, $1 + ldr $5, [TABLE, T0, lsl #2] + uxtb T0, $2 + ldr $6, [TABLE, T0, lsl #2] + uxtb T0, $3 + ldr $7, [TABLE, T0, lsl #2] + uxtb T0, $4 + ldr $8, [TABLE, T0, lsl #2] + + uxtb T0, $4, ror #8 + add TABLE, TABLE, #1024 + ldr T0, [TABLE, T0, lsl #2] + eor $5, $5, T0 + uxtb T0, $1, ror #8 + ldr T0, [TABLE, T0, lsl #2] + eor $6, $6, T0 + uxtb T0, $2, ror #8 + ldr T0, [TABLE, T0, lsl #2] + eor $7, $7, T0 + uxtb T0, $3, ror #8 + ldr T0, [TABLE, T0, lsl #2] + eor $8, $8, T0 + + uxtb T0, $3, ror #16 + add TABLE, TABLE, #1024 + ldr T0, [TABLE, T0, lsl #2] + eor $5, $5, T0 + uxtb T0, $4, ror #16 + ldr T0, [TABLE, T0, lsl #2] + eor $6, $6, T0 + uxtb T0, $1, ror #16 + ldr T0, [TABLE, T0, lsl #2] + eor $7, $7, T0 + uxtb T0, $2, ror #16 + ldr T0, [TABLE, T0, lsl #2] + eor $8, $8, T0 + + uxtb T0, $2, ror #24 + add TABLE, TABLE, #1024 + ldr T0, [TABLE, T0, lsl #2] + eor $5, $5, T0 + uxtb T0, $3, ror #24 + ldr T0, [TABLE, T0, lsl #2] + eor $6, $6, T0 + uxtb T0, $4, ror #24 + ldr T0, [TABLE, T0, lsl #2] + eor $7, $7, T0 + uxtb T0, $1, ror #24 + ldr T0, [TABLE, T0, lsl #2] + + ldm $9!, {$1,$2,$3,$4} + eor $8, $8, T0 + sub TABLE, TABLE, #3072 + eor $5, $5, $1 + eor $6, $6, $2 + eor $7, $7, $3 + eor $8, $8, $4 +>) + +C AES_FINAL_ROUND(a,b,c,d,key,res) +define(<AES_FINAL_ROUND>, < + uxtb T0, $1 + ldrb $6, [TABLE, T0] + uxtb T0, $2, ror #8 + ldrb T0, [TABLE, T0] + eor $6, $6, T0, lsl #8 + uxtb T0, $3, ror #16 + ldrb T0, [TABLE, T0] + eor $6, $6, T0, lsl #16 + uxtb T0, $4, ror #24 + ldrb T0, [TABLE, T0] + eor $6, $6, T0, lsl #24 + ldr T0, [$5], #+4 + eor $6, T0 +>) |