From 62721f4d5112733ff11d70fe4825fd2ee82b2dbf Mon Sep 17 00:00:00 2001
From: Sean Parkinson <sean@wolfssl.com>
Date: Thu, 19 Jun 2025 10:51:12 +1000
Subject: [PATCH] PPC32 SHA-256 ASM: small code implementation

Slower but smaller SHA-256 assembly code implementation enabled with:
WOLFSSL_PPC32_ASM_SMALL. (--enable-ppc32=small or
--enable-ppc32=inline,small)
---
 configure.ac                                  |   9 +-
 wolfcrypt/src/port/ppc32/ppc32-sha256-asm.S   | 716 ++++++++++++++++-
 wolfcrypt/src/port/ppc32/ppc32-sha256-asm_c.c | 733 +++++++++++++++++-
 3 files changed, 1455 insertions(+), 3 deletions(-)

diff --git a/configure.ac b/configure.ac
index 84e6bcbc6..259619912 100644
--- a/configure.ac
+++ b/configure.ac
@@ -3520,8 +3520,11 @@ then
       inline)
         ENABLED_PPC32_ASM_INLINE=yes
         ;;
+      small)
+        ENABLED_PPC32_ASM_SMALL=yes
+        ;;
       *)
-        AC_MSG_ERROR([Invalid RISC-V option [yes,inline]: $ENABLED_PPC32_ASM.])
+        AC_MSG_ERROR([Invalid RISC-V option [yes,inline,small]: $ENABLED_PPC32_ASM.])
         break
         ;;
       esac
@@ -3536,6 +3539,10 @@ if test "$ENABLED_PPC32_ASM_INLINE" = "yes"; then
 else
     AM_CCASFLAGS="$AM_CCASFLAGS -DWOLFSSL_PPC32_ASM"
 fi
+if test "$ENABLED_PPC32_ASM_SMALL" = "yes"; then
+    AM_CFLAGS="$AM_CFLAGS -DWOLFSSL_PPC32_ASM_SMALL"
+    AM_CCASFLAGS="$AM_CCASFLAGS -DWOLFSSL_PPC32_ASM_SMALL"
+fi
 
 # Xilinx hardened crypto
 AC_ARG_ENABLE([xilinx],
diff --git a/wolfcrypt/src/port/ppc32/ppc32-sha256-asm.S b/wolfcrypt/src/port/ppc32/ppc32-sha256-asm.S
index 4143c3281..bb20d8a84 100644
--- a/wolfcrypt/src/port/ppc32/ppc32-sha256-asm.S
+++ b/wolfcrypt/src/port/ppc32/ppc32-sha256-asm.S
@@ -166,6 +166,7 @@ L_SHA256_transform_len_begin:
 	lwz	29, 52(4)
 	lwz	30, 56(4)
 	lwz	31, 60(4)
+#ifndef WOLFSSL_PPC32_ASM_SMALL
 	li	7, 3
 	mtctr	7
 	# Start of 16 rounds
@@ -1228,6 +1229,720 @@ L_SHA256_transform_len_start:
 	and	0, 0, 7
 	xor	0, 0, 10
 	add	8, 8, 0
+	subi	6, 6, 0xc0
+#else
+	li	7, 4
+	mtctr	7
+	# Start of 16 rounds
+L_SHA256_transform_len_start:
+	# Round 0
+	rotlwi	0, 12, 26
+	rotlwi	7, 12, 21
+	xor	0, 0, 7
+	rotlwi	7, 12, 7
+	xor	0, 0, 7
+	add	15, 15, 0
+	xor	0, 13, 14
+	and	0, 0, 12
+	xor	0, 0, 14
+	add	15, 15, 0
+	lwz	0, 0(6)
+	add	15, 15, 16
+	add	15, 15, 0
+	add	11, 11, 15
+	rotlwi	0, 8, 30
+	rotlwi	7, 8, 19
+	xor	0, 0, 7
+	rotlwi	7, 8, 10
+	xor	0, 0, 7
+	add	15, 15, 0
+	xor	7, 8, 9
+	xor	0, 9, 10
+	and	0, 0, 7
+	xor	0, 0, 9
+	add	15, 15, 0
+	mfctr	7
+	cmpwi	0, 7, 1
+	beq	0, L_SHA256_transform_len_after_blk_0
+	# Calc new W[0]
+	rotlwi	0, 17, 25
+	rotlwi	7, 17, 14
+	xor	0, 0, 7
+	srwi	7, 17, 3
+	xor	0, 0, 7
+	add	16, 16, 0
+	rotlwi	0, 30, 15
+	rotlwi	7, 30, 13
+	xor	0, 0, 7
+	srwi	7, 30, 10
+	xor	0, 0, 7
+	add	16, 16, 0
+	add	16, 16, 25
+L_SHA256_transform_len_after_blk_0:
+	# Round 1
+	rotlwi	0, 11, 26
+	rotlwi	7, 11, 21
+	xor	0, 0, 7
+	rotlwi	7, 11, 7
+	xor	0, 0, 7
+	add	14, 14, 0
+	xor	0, 12, 13
+	and	0, 0, 11
+	xor	0, 0, 13
+	add	14, 14, 0
+	lwz	0, 4(6)
+	add	14, 14, 17
+	add	14, 14, 0
+	add	10, 10, 14
+	rotlwi	0, 15, 30
+	rotlwi	7, 15, 19
+	xor	0, 0, 7
+	rotlwi	7, 15, 10
+	xor	0, 0, 7
+	add	14, 14, 0
+	xor	7, 15, 8
+	xor	0, 8, 9
+	and	0, 0, 7
+	xor	0, 0, 8
+	add	14, 14, 0
+	mfctr	7
+	cmpwi	0, 7, 1
+	beq	0, L_SHA256_transform_len_after_blk_1
+	# Calc new W[1]
+	rotlwi	0, 18, 25
+	rotlwi	7, 18, 14
+	xor	0, 0, 7
+	srwi	7, 18, 3
+	xor	0, 0, 7
+	add	17, 17, 0
+	rotlwi	0, 31, 15
+	rotlwi	7, 31, 13
+	xor	0, 0, 7
+	srwi	7, 31, 10
+	xor	0, 0, 7
+	add	17, 17, 0
+	add	17, 17, 26
+L_SHA256_transform_len_after_blk_1:
+	# Round 2
+	rotlwi	0, 10, 26
+	rotlwi	7, 10, 21
+	xor	0, 0, 7
+	rotlwi	7, 10, 7
+	xor	0, 0, 7
+	add	13, 13, 0
+	xor	0, 11, 12
+	and	0, 0, 10
+	xor	0, 0, 12
+	add	13, 13, 0
+	lwz	0, 8(6)
+	add	13, 13, 18
+	add	13, 13, 0
+	add	9, 9, 13
+	rotlwi	0, 14, 30
+	rotlwi	7, 14, 19
+	xor	0, 0, 7
+	rotlwi	7, 14, 10
+	xor	0, 0, 7
+	add	13, 13, 0
+	xor	7, 14, 15
+	xor	0, 15, 8
+	and	0, 0, 7
+	xor	0, 0, 15
+	add	13, 13, 0
+	mfctr	7
+	cmpwi	0, 7, 1
+	beq	0, L_SHA256_transform_len_after_blk_2
+	# Calc new W[2]
+	rotlwi	0, 19, 25
+	rotlwi	7, 19, 14
+	xor	0, 0, 7
+	srwi	7, 19, 3
+	xor	0, 0, 7
+	add	18, 18, 0
+	rotlwi	0, 16, 15
+	rotlwi	7, 16, 13
+	xor	0, 0, 7
+	srwi	7, 16, 10
+	xor	0, 0, 7
+	add	18, 18, 0
+	add	18, 18, 27
+L_SHA256_transform_len_after_blk_2:
+	# Round 3
+	rotlwi	0, 9, 26
+	rotlwi	7, 9, 21
+	xor	0, 0, 7
+	rotlwi	7, 9, 7
+	xor	0, 0, 7
+	add	12, 12, 0
+	xor	0, 10, 11
+	and	0, 0, 9
+	xor	0, 0, 11
+	add	12, 12, 0
+	lwz	0, 12(6)
+	add	12, 12, 19
+	add	12, 12, 0
+	add	8, 8, 12
+	rotlwi	0, 13, 30
+	rotlwi	7, 13, 19
+	xor	0, 0, 7
+	rotlwi	7, 13, 10
+	xor	0, 0, 7
+	add	12, 12, 0
+	xor	7, 13, 14
+	xor	0, 14, 15
+	and	0, 0, 7
+	xor	0, 0, 14
+	add	12, 12, 0
+	mfctr	7
+	cmpwi	0, 7, 1
+	beq	0, L_SHA256_transform_len_after_blk_3
+	# Calc new W[3]
+	rotlwi	0, 20, 25
+	rotlwi	7, 20, 14
+	xor	0, 0, 7
+	srwi	7, 20, 3
+	xor	0, 0, 7
+	add	19, 19, 0
+	rotlwi	0, 17, 15
+	rotlwi	7, 17, 13
+	xor	0, 0, 7
+	srwi	7, 17, 10
+	xor	0, 0, 7
+	add	19, 19, 0
+	add	19, 19, 28
+L_SHA256_transform_len_after_blk_3:
+	# Round 4
+	rotlwi	0, 8, 26
+	rotlwi	7, 8, 21
+	xor	0, 0, 7
+	rotlwi	7, 8, 7
+	xor	0, 0, 7
+	add	11, 11, 0
+	xor	0, 9, 10
+	and	0, 0, 8
+	xor	0, 0, 10
+	add	11, 11, 0
+	lwz	0, 16(6)
+	add	11, 11, 20
+	add	11, 11, 0
+	add	15, 15, 11
+	rotlwi	0, 12, 30
+	rotlwi	7, 12, 19
+	xor	0, 0, 7
+	rotlwi	7, 12, 10
+	xor	0, 0, 7
+	add	11, 11, 0
+	xor	7, 12, 13
+	xor	0, 13, 14
+	and	0, 0, 7
+	xor	0, 0, 13
+	add	11, 11, 0
+	mfctr	7
+	cmpwi	0, 7, 1
+	beq	0, L_SHA256_transform_len_after_blk_4
+	# Calc new W[4]
+	rotlwi	0, 21, 25
+	rotlwi	7, 21, 14
+	xor	0, 0, 7
+	srwi	7, 21, 3
+	xor	0, 0, 7
+	add	20, 20, 0
+	rotlwi	0, 18, 15
+	rotlwi	7, 18, 13
+	xor	0, 0, 7
+	srwi	7, 18, 10
+	xor	0, 0, 7
+	add	20, 20, 0
+	add	20, 20, 29
+L_SHA256_transform_len_after_blk_4:
+	# Round 5
+	rotlwi	0, 15, 26
+	rotlwi	7, 15, 21
+	xor	0, 0, 7
+	rotlwi	7, 15, 7
+	xor	0, 0, 7
+	add	10, 10, 0
+	xor	0, 8, 9
+	and	0, 0, 15
+	xor	0, 0, 9
+	add	10, 10, 0
+	lwz	0, 20(6)
+	add	10, 10, 21
+	add	10, 10, 0
+	add	14, 14, 10
+	rotlwi	0, 11, 30
+	rotlwi	7, 11, 19
+	xor	0, 0, 7
+	rotlwi	7, 11, 10
+	xor	0, 0, 7
+	add	10, 10, 0
+	xor	7, 11, 12
+	xor	0, 12, 13
+	and	0, 0, 7
+	xor	0, 0, 12
+	add	10, 10, 0
+	mfctr	7
+	cmpwi	0, 7, 1
+	beq	0, L_SHA256_transform_len_after_blk_5
+	# Calc new W[5]
+	rotlwi	0, 22, 25
+	rotlwi	7, 22, 14
+	xor	0, 0, 7
+	srwi	7, 22, 3
+	xor	0, 0, 7
+	add	21, 21, 0
+	rotlwi	0, 19, 15
+	rotlwi	7, 19, 13
+	xor	0, 0, 7
+	srwi	7, 19, 10
+	xor	0, 0, 7
+	add	21, 21, 0
+	add	21, 21, 30
+L_SHA256_transform_len_after_blk_5:
+	# Round 6
+	rotlwi	0, 14, 26
+	rotlwi	7, 14, 21
+	xor	0, 0, 7
+	rotlwi	7, 14, 7
+	xor	0, 0, 7
+	add	9, 9, 0
+	xor	0, 15, 8
+	and	0, 0, 14
+	xor	0, 0, 8
+	add	9, 9, 0
+	lwz	0, 24(6)
+	add	9, 9, 22
+	add	9, 9, 0
+	add	13, 13, 9
+	rotlwi	0, 10, 30
+	rotlwi	7, 10, 19
+	xor	0, 0, 7
+	rotlwi	7, 10, 10
+	xor	0, 0, 7
+	add	9, 9, 0
+	xor	7, 10, 11
+	xor	0, 11, 12
+	and	0, 0, 7
+	xor	0, 0, 11
+	add	9, 9, 0
+	mfctr	7
+	cmpwi	0, 7, 1
+	beq	0, L_SHA256_transform_len_after_blk_6
+	# Calc new W[6]
+	rotlwi	0, 23, 25
+	rotlwi	7, 23, 14
+	xor	0, 0, 7
+	srwi	7, 23, 3
+	xor	0, 0, 7
+	add	22, 22, 0
+	rotlwi	0, 20, 15
+	rotlwi	7, 20, 13
+	xor	0, 0, 7
+	srwi	7, 20, 10
+	xor	0, 0, 7
+	add	22, 22, 0
+	add	22, 22, 31
+L_SHA256_transform_len_after_blk_6:
+	# Round 7
+	rotlwi	0, 13, 26
+	rotlwi	7, 13, 21
+	xor	0, 0, 7
+	rotlwi	7, 13, 7
+	xor	0, 0, 7
+	add	8, 8, 0
+	xor	0, 14, 15
+	and	0, 0, 13
+	xor	0, 0, 15
+	add	8, 8, 0
+	lwz	0, 28(6)
+	add	8, 8, 23
+	add	8, 8, 0
+	add	12, 12, 8
+	rotlwi	0, 9, 30
+	rotlwi	7, 9, 19
+	xor	0, 0, 7
+	rotlwi	7, 9, 10
+	xor	0, 0, 7
+	add	8, 8, 0
+	xor	7, 9, 10
+	xor	0, 10, 11
+	and	0, 0, 7
+	xor	0, 0, 10
+	add	8, 8, 0
+	mfctr	7
+	cmpwi	0, 7, 1
+	beq	0, L_SHA256_transform_len_after_blk_7
+	# Calc new W[7]
+	rotlwi	0, 24, 25
+	rotlwi	7, 24, 14
+	xor	0, 0, 7
+	srwi	7, 24, 3
+	xor	0, 0, 7
+	add	23, 23, 0
+	rotlwi	0, 21, 15
+	rotlwi	7, 21, 13
+	xor	0, 0, 7
+	srwi	7, 21, 10
+	xor	0, 0, 7
+	add	23, 23, 0
+	add	23, 23, 16
+L_SHA256_transform_len_after_blk_7:
+	# Round 8
+	rotlwi	0, 12, 26
+	rotlwi	7, 12, 21
+	xor	0, 0, 7
+	rotlwi	7, 12, 7
+	xor	0, 0, 7
+	add	15, 15, 0
+	xor	0, 13, 14
+	and	0, 0, 12
+	xor	0, 0, 14
+	add	15, 15, 0
+	lwz	0, 32(6)
+	add	15, 15, 24
+	add	15, 15, 0
+	add	11, 11, 15
+	rotlwi	0, 8, 30
+	rotlwi	7, 8, 19
+	xor	0, 0, 7
+	rotlwi	7, 8, 10
+	xor	0, 0, 7
+	add	15, 15, 0
+	xor	7, 8, 9
+	xor	0, 9, 10
+	and	0, 0, 7
+	xor	0, 0, 9
+	add	15, 15, 0
+	mfctr	7
+	cmpwi	0, 7, 1
+	beq	0, L_SHA256_transform_len_after_blk_8
+	# Calc new W[8]
+	rotlwi	0, 25, 25
+	rotlwi	7, 25, 14
+	xor	0, 0, 7
+	srwi	7, 25, 3
+	xor	0, 0, 7
+	add	24, 24, 0
+	rotlwi	0, 22, 15
+	rotlwi	7, 22, 13
+	xor	0, 0, 7
+	srwi	7, 22, 10
+	xor	0, 0, 7
+	add	24, 24, 0
+	add	24, 24, 17
+L_SHA256_transform_len_after_blk_8:
+	# Round 9
+	rotlwi	0, 11, 26
+	rotlwi	7, 11, 21
+	xor	0, 0, 7
+	rotlwi	7, 11, 7
+	xor	0, 0, 7
+	add	14, 14, 0
+	xor	0, 12, 13
+	and	0, 0, 11
+	xor	0, 0, 13
+	add	14, 14, 0
+	lwz	0, 36(6)
+	add	14, 14, 25
+	add	14, 14, 0
+	add	10, 10, 14
+	rotlwi	0, 15, 30
+	rotlwi	7, 15, 19
+	xor	0, 0, 7
+	rotlwi	7, 15, 10
+	xor	0, 0, 7
+	add	14, 14, 0
+	xor	7, 15, 8
+	xor	0, 8, 9
+	and	0, 0, 7
+	xor	0, 0, 8
+	add	14, 14, 0
+	mfctr	7
+	cmpwi	0, 7, 1
+	beq	0, L_SHA256_transform_len_after_blk_9
+	# Calc new W[9]
+	rotlwi	0, 26, 25
+	rotlwi	7, 26, 14
+	xor	0, 0, 7
+	srwi	7, 26, 3
+	xor	0, 0, 7
+	add	25, 25, 0
+	rotlwi	0, 23, 15
+	rotlwi	7, 23, 13
+	xor	0, 0, 7
+	srwi	7, 23, 10
+	xor	0, 0, 7
+	add	25, 25, 0
+	add	25, 25, 18
+L_SHA256_transform_len_after_blk_9:
+	# Round 10
+	rotlwi	0, 10, 26
+	rotlwi	7, 10, 21
+	xor	0, 0, 7
+	rotlwi	7, 10, 7
+	xor	0, 0, 7
+	add	13, 13, 0
+	xor	0, 11, 12
+	and	0, 0, 10
+	xor	0, 0, 12
+	add	13, 13, 0
+	lwz	0, 40(6)
+	add	13, 13, 26
+	add	13, 13, 0
+	add	9, 9, 13
+	rotlwi	0, 14, 30
+	rotlwi	7, 14, 19
+	xor	0, 0, 7
+	rotlwi	7, 14, 10
+	xor	0, 0, 7
+	add	13, 13, 0
+	xor	7, 14, 15
+	xor	0, 15, 8
+	and	0, 0, 7
+	xor	0, 0, 15
+	add	13, 13, 0
+	mfctr	7
+	cmpwi	0, 7, 1
+	beq	0, L_SHA256_transform_len_after_blk_10
+	# Calc new W[10]
+	rotlwi	0, 27, 25
+	rotlwi	7, 27, 14
+	xor	0, 0, 7
+	srwi	7, 27, 3
+	xor	0, 0, 7
+	add	26, 26, 0
+	rotlwi	0, 24, 15
+	rotlwi	7, 24, 13
+	xor	0, 0, 7
+	srwi	7, 24, 10
+	xor	0, 0, 7
+	add	26, 26, 0
+	add	26, 26, 19
+L_SHA256_transform_len_after_blk_10:
+	# Round 11
+	rotlwi	0, 9, 26
+	rotlwi	7, 9, 21
+	xor	0, 0, 7
+	rotlwi	7, 9, 7
+	xor	0, 0, 7
+	add	12, 12, 0
+	xor	0, 10, 11
+	and	0, 0, 9
+	xor	0, 0, 11
+	add	12, 12, 0
+	lwz	0, 44(6)
+	add	12, 12, 27
+	add	12, 12, 0
+	add	8, 8, 12
+	rotlwi	0, 13, 30
+	rotlwi	7, 13, 19
+	xor	0, 0, 7
+	rotlwi	7, 13, 10
+	xor	0, 0, 7
+	add	12, 12, 0
+	xor	7, 13, 14
+	xor	0, 14, 15
+	and	0, 0, 7
+	xor	0, 0, 14
+	add	12, 12, 0
+	mfctr	7
+	cmpwi	0, 7, 1
+	beq	0, L_SHA256_transform_len_after_blk_11
+	# Calc new W[11]
+	rotlwi	0, 28, 25
+	rotlwi	7, 28, 14
+	xor	0, 0, 7
+	srwi	7, 28, 3
+	xor	0, 0, 7
+	add	27, 27, 0
+	rotlwi	0, 25, 15
+	rotlwi	7, 25, 13
+	xor	0, 0, 7
+	srwi	7, 25, 10
+	xor	0, 0, 7
+	add	27, 27, 0
+	add	27, 27, 20
+L_SHA256_transform_len_after_blk_11:
+	# Round 12
+	rotlwi	0, 8, 26
+	rotlwi	7, 8, 21
+	xor	0, 0, 7
+	rotlwi	7, 8, 7
+	xor	0, 0, 7
+	add	11, 11, 0
+	xor	0, 9, 10
+	and	0, 0, 8
+	xor	0, 0, 10
+	add	11, 11, 0
+	lwz	0, 48(6)
+	add	11, 11, 28
+	add	11, 11, 0
+	add	15, 15, 11
+	rotlwi	0, 12, 30
+	rotlwi	7, 12, 19
+	xor	0, 0, 7
+	rotlwi	7, 12, 10
+	xor	0, 0, 7
+	add	11, 11, 0
+	xor	7, 12, 13
+	xor	0, 13, 14
+	and	0, 0, 7
+	xor	0, 0, 13
+	add	11, 11, 0
+	mfctr	7
+	cmpwi	0, 7, 1
+	beq	0, L_SHA256_transform_len_after_blk_12
+	# Calc new W[12]
+	rotlwi	0, 29, 25
+	rotlwi	7, 29, 14
+	xor	0, 0, 7
+	srwi	7, 29, 3
+	xor	0, 0, 7
+	add	28, 28, 0
+	rotlwi	0, 26, 15
+	rotlwi	7, 26, 13
+	xor	0, 0, 7
+	srwi	7, 26, 10
+	xor	0, 0, 7
+	add	28, 28, 0
+	add	28, 28, 21
+L_SHA256_transform_len_after_blk_12:
+	# Round 13
+	rotlwi	0, 15, 26
+	rotlwi	7, 15, 21
+	xor	0, 0, 7
+	rotlwi	7, 15, 7
+	xor	0, 0, 7
+	add	10, 10, 0
+	xor	0, 8, 9
+	and	0, 0, 15
+	xor	0, 0, 9
+	add	10, 10, 0
+	lwz	0, 52(6)
+	add	10, 10, 29
+	add	10, 10, 0
+	add	14, 14, 10
+	rotlwi	0, 11, 30
+	rotlwi	7, 11, 19
+	xor	0, 0, 7
+	rotlwi	7, 11, 10
+	xor	0, 0, 7
+	add	10, 10, 0
+	xor	7, 11, 12
+	xor	0, 12, 13
+	and	0, 0, 7
+	xor	0, 0, 12
+	add	10, 10, 0
+	mfctr	7
+	cmpwi	0, 7, 1
+	beq	0, L_SHA256_transform_len_after_blk_13
+	# Calc new W[13]
+	rotlwi	0, 30, 25
+	rotlwi	7, 30, 14
+	xor	0, 0, 7
+	srwi	7, 30, 3
+	xor	0, 0, 7
+	add	29, 29, 0
+	rotlwi	0, 27, 15
+	rotlwi	7, 27, 13
+	xor	0, 0, 7
+	srwi	7, 27, 10
+	xor	0, 0, 7
+	add	29, 29, 0
+	add	29, 29, 22
+L_SHA256_transform_len_after_blk_13:
+	# Round 14
+	rotlwi	0, 14, 26
+	rotlwi	7, 14, 21
+	xor	0, 0, 7
+	rotlwi	7, 14, 7
+	xor	0, 0, 7
+	add	9, 9, 0
+	xor	0, 15, 8
+	and	0, 0, 14
+	xor	0, 0, 8
+	add	9, 9, 0
+	lwz	0, 56(6)
+	add	9, 9, 30
+	add	9, 9, 0
+	add	13, 13, 9
+	rotlwi	0, 10, 30
+	rotlwi	7, 10, 19
+	xor	0, 0, 7
+	rotlwi	7, 10, 10
+	xor	0, 0, 7
+	add	9, 9, 0
+	xor	7, 10, 11
+	xor	0, 11, 12
+	and	0, 0, 7
+	xor	0, 0, 11
+	add	9, 9, 0
+	mfctr	7
+	cmpwi	0, 7, 1
+	beq	0, L_SHA256_transform_len_after_blk_14
+	# Calc new W[14]
+	rotlwi	0, 31, 25
+	rotlwi	7, 31, 14
+	xor	0, 0, 7
+	srwi	7, 31, 3
+	xor	0, 0, 7
+	add	30, 30, 0
+	rotlwi	0, 28, 15
+	rotlwi	7, 28, 13
+	xor	0, 0, 7
+	srwi	7, 28, 10
+	xor	0, 0, 7
+	add	30, 30, 0
+	add	30, 30, 23
+L_SHA256_transform_len_after_blk_14:
+	# Round 15
+	rotlwi	0, 13, 26
+	rotlwi	7, 13, 21
+	xor	0, 0, 7
+	rotlwi	7, 13, 7
+	xor	0, 0, 7
+	add	8, 8, 0
+	xor	0, 14, 15
+	and	0, 0, 13
+	xor	0, 0, 15
+	add	8, 8, 0
+	lwz	0, 60(6)
+	add	8, 8, 31
+	add	8, 8, 0
+	add	12, 12, 8
+	rotlwi	0, 9, 30
+	rotlwi	7, 9, 19
+	xor	0, 0, 7
+	rotlwi	7, 9, 10
+	xor	0, 0, 7
+	add	8, 8, 0
+	xor	7, 9, 10
+	xor	0, 10, 11
+	and	0, 0, 7
+	xor	0, 0, 10
+	add	8, 8, 0
+	mfctr	7
+	cmpwi	0, 7, 1
+	beq	0, L_SHA256_transform_len_after_blk_15
+	# Calc new W[15]
+	rotlwi	0, 16, 25
+	rotlwi	7, 16, 14
+	xor	0, 0, 7
+	srwi	7, 16, 3
+	xor	0, 0, 7
+	add	31, 31, 0
+	rotlwi	0, 29, 15
+	rotlwi	7, 29, 13
+	xor	0, 0, 7
+	srwi	7, 29, 10
+	xor	0, 0, 7
+	add	31, 31, 0
+	add	31, 31, 24
+L_SHA256_transform_len_after_blk_15:
+	addi	6, 6, 0x40
+	bdnz	L_SHA256_transform_len_start
+	subi	6, 6, 0x100
+#endif /* WOLFSSL_PPC32_ASM_SMALL */
 	# Add in digest from start
 	lwz	0, 0(1)
 	lwz	7, 4(1)
@@ -1253,7 +1968,6 @@ L_SHA256_transform_len_start:
 	stw	13, 20(1)
 	stw	14, 24(1)
 	stw	15, 28(1)
-	subi	6, 6, 0xc0
 	mtctr	5
 	addi	4, 4, 0x40
 	subi	5, 5, 1
diff --git a/wolfcrypt/src/port/ppc32/ppc32-sha256-asm_c.c b/wolfcrypt/src/port/ppc32/ppc32-sha256-asm_c.c
index 3500a750c..23a7858a4 100644
--- a/wolfcrypt/src/port/ppc32/ppc32-sha256-asm_c.c
+++ b/wolfcrypt/src/port/ppc32/ppc32-sha256-asm_c.c
@@ -130,6 +130,7 @@ void Transform_Sha256_Len(wc_Sha256* sha256, const byte* data, word32 len)
         "lwz     29, 52(%[data])\n\t"
         "lwz     30, 56(%[data])\n\t"
         "lwz     31, 60(%[data])\n\t"
+#ifndef WOLFSSL_PPC32_ASM_SMALL
         "li      7, 3\n\t"
         "mtctr   7\n\t"
         /* Start of 16 rounds */
@@ -1193,6 +1194,737 @@ void Transform_Sha256_Len(wc_Sha256* sha256, const byte* data, word32 len)
         "and     0, 0, 7\n\t"
         "xor     0, 0, 10\n\t"
         "add     8, 8, 0\n\t"
+        "subi    6, 6, 0xc0\n\t"
+#else
+        "li      7, 4\n\t"
+        "mtctr   7\n\t"
+        /* Start of 16 rounds */
+        "\n"
+    "L_SHA256_transform_len_start_%=: \n\t"
+        /* Round 0 */
+        "rotlwi  0, 12, 26\n\t"
+        "rotlwi  7, 12, 21\n\t"
+        "xor     0, 0, 7\n\t"
+        "rotlwi  7, 12, 7\n\t"
+        "xor     0, 0, 7\n\t"
+        "add     15, 15, 0\n\t"
+        "xor     0, 13, 14\n\t"
+        "and     0, 0, 12\n\t"
+        "xor     0, 0, 14\n\t"
+        "add     15, 15, 0\n\t"
+        "lwz     0, 0(6)\n\t"
+        "add     15, 15, 16\n\t"
+        "add     15, 15, 0\n\t"
+        "add     11, 11, 15\n\t"
+        "rotlwi  0, 8, 30\n\t"
+        "rotlwi  7, 8, 19\n\t"
+        "xor     0, 0, 7\n\t"
+        "rotlwi  7, 8, 10\n\t"
+        "xor     0, 0, 7\n\t"
+        "add     15, 15, 0\n\t"
+        "xor     7, 8, 9\n\t"
+        "xor     0, 9, 10\n\t"
+        "and     0, 0, 7\n\t"
+        "xor     0, 0, 9\n\t"
+        "add     15, 15, 0\n\t"
+        "mfctr   7\n\t"
+        "cmpwi   0, 7, 1\n\t"
+        "beq     0, L_SHA256_transform_len_after_blk_0_%=\n\t"
+        /* Calc new W[0] */
+        "rotlwi  0, 17, 25\n\t"
+        "rotlwi  7, 17, 14\n\t"
+        "xor     0, 0, 7\n\t"
+        "srwi    7, 17, 3\n\t"
+        "xor     0, 0, 7\n\t"
+        "add     16, 16, 0\n\t"
+        "rotlwi  0, 30, 15\n\t"
+        "rotlwi  7, 30, 13\n\t"
+        "xor     0, 0, 7\n\t"
+        "srwi    7, 30, 10\n\t"
+        "xor     0, 0, 7\n\t"
+        "add     16, 16, 0\n\t"
+        "add     16, 16, 25\n\t"
+        "\n"
+    "L_SHA256_transform_len_after_blk_0_%=: \n\t"
+        /* Round 1 */
+        "rotlwi  0, 11, 26\n\t"
+        "rotlwi  7, 11, 21\n\t"
+        "xor     0, 0, 7\n\t"
+        "rotlwi  7, 11, 7\n\t"
+        "xor     0, 0, 7\n\t"
+        "add     14, 14, 0\n\t"
+        "xor     0, 12, 13\n\t"
+        "and     0, 0, 11\n\t"
+        "xor     0, 0, 13\n\t"
+        "add     14, 14, 0\n\t"
+        "lwz     0, 4(6)\n\t"
+        "add     14, 14, 17\n\t"
+        "add     14, 14, 0\n\t"
+        "add     10, 10, 14\n\t"
+        "rotlwi  0, 15, 30\n\t"
+        "rotlwi  7, 15, 19\n\t"
+        "xor     0, 0, 7\n\t"
+        "rotlwi  7, 15, 10\n\t"
+        "xor     0, 0, 7\n\t"
+        "add     14, 14, 0\n\t"
+        "xor     7, 15, 8\n\t"
+        "xor     0, 8, 9\n\t"
+        "and     0, 0, 7\n\t"
+        "xor     0, 0, 8\n\t"
+        "add     14, 14, 0\n\t"
+        "mfctr   7\n\t"
+        "cmpwi   0, 7, 1\n\t"
+        "beq     0, L_SHA256_transform_len_after_blk_1_%=\n\t"
+        /* Calc new W[1] */
+        "rotlwi  0, 18, 25\n\t"
+        "rotlwi  7, 18, 14\n\t"
+        "xor     0, 0, 7\n\t"
+        "srwi    7, 18, 3\n\t"
+        "xor     0, 0, 7\n\t"
+        "add     17, 17, 0\n\t"
+        "rotlwi  0, 31, 15\n\t"
+        "rotlwi  7, 31, 13\n\t"
+        "xor     0, 0, 7\n\t"
+        "srwi    7, 31, 10\n\t"
+        "xor     0, 0, 7\n\t"
+        "add     17, 17, 0\n\t"
+        "add     17, 17, 26\n\t"
+        "\n"
+    "L_SHA256_transform_len_after_blk_1_%=: \n\t"
+        /* Round 2 */
+        "rotlwi  0, 10, 26\n\t"
+        "rotlwi  7, 10, 21\n\t"
+        "xor     0, 0, 7\n\t"
+        "rotlwi  7, 10, 7\n\t"
+        "xor     0, 0, 7\n\t"
+        "add     13, 13, 0\n\t"
+        "xor     0, 11, 12\n\t"
+        "and     0, 0, 10\n\t"
+        "xor     0, 0, 12\n\t"
+        "add     13, 13, 0\n\t"
+        "lwz     0, 8(6)\n\t"
+        "add     13, 13, 18\n\t"
+        "add     13, 13, 0\n\t"
+        "add     9, 9, 13\n\t"
+        "rotlwi  0, 14, 30\n\t"
+        "rotlwi  7, 14, 19\n\t"
+        "xor     0, 0, 7\n\t"
+        "rotlwi  7, 14, 10\n\t"
+        "xor     0, 0, 7\n\t"
+        "add     13, 13, 0\n\t"
+        "xor     7, 14, 15\n\t"
+        "xor     0, 15, 8\n\t"
+        "and     0, 0, 7\n\t"
+        "xor     0, 0, 15\n\t"
+        "add     13, 13, 0\n\t"
+        "mfctr   7\n\t"
+        "cmpwi   0, 7, 1\n\t"
+        "beq     0, L_SHA256_transform_len_after_blk_2_%=\n\t"
+        /* Calc new W[2] */
+        "rotlwi  0, 19, 25\n\t"
+        "rotlwi  7, 19, 14\n\t"
+        "xor     0, 0, 7\n\t"
+        "srwi    7, 19, 3\n\t"
+        "xor     0, 0, 7\n\t"
+        "add     18, 18, 0\n\t"
+        "rotlwi  0, 16, 15\n\t"
+        "rotlwi  7, 16, 13\n\t"
+        "xor     0, 0, 7\n\t"
+        "srwi    7, 16, 10\n\t"
+        "xor     0, 0, 7\n\t"
+        "add     18, 18, 0\n\t"
+        "add     18, 18, 27\n\t"
+        "\n"
+    "L_SHA256_transform_len_after_blk_2_%=: \n\t"
+        /* Round 3 */
+        "rotlwi  0, 9, 26\n\t"
+        "rotlwi  7, 9, 21\n\t"
+        "xor     0, 0, 7\n\t"
+        "rotlwi  7, 9, 7\n\t"
+        "xor     0, 0, 7\n\t"
+        "add     12, 12, 0\n\t"
+        "xor     0, 10, 11\n\t"
+        "and     0, 0, 9\n\t"
+        "xor     0, 0, 11\n\t"
+        "add     12, 12, 0\n\t"
+        "lwz     0, 12(6)\n\t"
+        "add     12, 12, 19\n\t"
+        "add     12, 12, 0\n\t"
+        "add     8, 8, 12\n\t"
+        "rotlwi  0, 13, 30\n\t"
+        "rotlwi  7, 13, 19\n\t"
+        "xor     0, 0, 7\n\t"
+        "rotlwi  7, 13, 10\n\t"
+        "xor     0, 0, 7\n\t"
+        "add     12, 12, 0\n\t"
+        "xor     7, 13, 14\n\t"
+        "xor     0, 14, 15\n\t"
+        "and     0, 0, 7\n\t"
+        "xor     0, 0, 14\n\t"
+        "add     12, 12, 0\n\t"
+        "mfctr   7\n\t"
+        "cmpwi   0, 7, 1\n\t"
+        "beq     0, L_SHA256_transform_len_after_blk_3_%=\n\t"
+        /* Calc new W[3] */
+        "rotlwi  0, 20, 25\n\t"
+        "rotlwi  7, 20, 14\n\t"
+        "xor     0, 0, 7\n\t"
+        "srwi    7, 20, 3\n\t"
+        "xor     0, 0, 7\n\t"
+        "add     19, 19, 0\n\t"
+        "rotlwi  0, 17, 15\n\t"
+        "rotlwi  7, 17, 13\n\t"
+        "xor     0, 0, 7\n\t"
+        "srwi    7, 17, 10\n\t"
+        "xor     0, 0, 7\n\t"
+        "add     19, 19, 0\n\t"
+        "add     19, 19, 28\n\t"
+        "\n"
+    "L_SHA256_transform_len_after_blk_3_%=: \n\t"
+        /* Round 4 */
+        "rotlwi  0, 8, 26\n\t"
+        "rotlwi  7, 8, 21\n\t"
+        "xor     0, 0, 7\n\t"
+        "rotlwi  7, 8, 7\n\t"
+        "xor     0, 0, 7\n\t"
+        "add     11, 11, 0\n\t"
+        "xor     0, 9, 10\n\t"
+        "and     0, 0, 8\n\t"
+        "xor     0, 0, 10\n\t"
+        "add     11, 11, 0\n\t"
+        "lwz     0, 16(6)\n\t"
+        "add     11, 11, 20\n\t"
+        "add     11, 11, 0\n\t"
+        "add     15, 15, 11\n\t"
+        "rotlwi  0, 12, 30\n\t"
+        "rotlwi  7, 12, 19\n\t"
+        "xor     0, 0, 7\n\t"
+        "rotlwi  7, 12, 10\n\t"
+        "xor     0, 0, 7\n\t"
+        "add     11, 11, 0\n\t"
+        "xor     7, 12, 13\n\t"
+        "xor     0, 13, 14\n\t"
+        "and     0, 0, 7\n\t"
+        "xor     0, 0, 13\n\t"
+        "add     11, 11, 0\n\t"
+        "mfctr   7\n\t"
+        "cmpwi   0, 7, 1\n\t"
+        "beq     0, L_SHA256_transform_len_after_blk_4_%=\n\t"
+        /* Calc new W[4] */
+        "rotlwi  0, 21, 25\n\t"
+        "rotlwi  7, 21, 14\n\t"
+        "xor     0, 0, 7\n\t"
+        "srwi    7, 21, 3\n\t"
+        "xor     0, 0, 7\n\t"
+        "add     20, 20, 0\n\t"
+        "rotlwi  0, 18, 15\n\t"
+        "rotlwi  7, 18, 13\n\t"
+        "xor     0, 0, 7\n\t"
+        "srwi    7, 18, 10\n\t"
+        "xor     0, 0, 7\n\t"
+        "add     20, 20, 0\n\t"
+        "add     20, 20, 29\n\t"
+        "\n"
+    "L_SHA256_transform_len_after_blk_4_%=: \n\t"
+        /* Round 5 */
+        "rotlwi  0, 15, 26\n\t"
+        "rotlwi  7, 15, 21\n\t"
+        "xor     0, 0, 7\n\t"
+        "rotlwi  7, 15, 7\n\t"
+        "xor     0, 0, 7\n\t"
+        "add     10, 10, 0\n\t"
+        "xor     0, 8, 9\n\t"
+        "and     0, 0, 15\n\t"
+        "xor     0, 0, 9\n\t"
+        "add     10, 10, 0\n\t"
+        "lwz     0, 20(6)\n\t"
+        "add     10, 10, 21\n\t"
+        "add     10, 10, 0\n\t"
+        "add     14, 14, 10\n\t"
+        "rotlwi  0, 11, 30\n\t"
+        "rotlwi  7, 11, 19\n\t"
+        "xor     0, 0, 7\n\t"
+        "rotlwi  7, 11, 10\n\t"
+        "xor     0, 0, 7\n\t"
+        "add     10, 10, 0\n\t"
+        "xor     7, 11, 12\n\t"
+        "xor     0, 12, 13\n\t"
+        "and     0, 0, 7\n\t"
+        "xor     0, 0, 12\n\t"
+        "add     10, 10, 0\n\t"
+        "mfctr   7\n\t"
+        "cmpwi   0, 7, 1\n\t"
+        "beq     0, L_SHA256_transform_len_after_blk_5_%=\n\t"
+        /* Calc new W[5] */
+        "rotlwi  0, 22, 25\n\t"
+        "rotlwi  7, 22, 14\n\t"
+        "xor     0, 0, 7\n\t"
+        "srwi    7, 22, 3\n\t"
+        "xor     0, 0, 7\n\t"
+        "add     21, 21, 0\n\t"
+        "rotlwi  0, 19, 15\n\t"
+        "rotlwi  7, 19, 13\n\t"
+        "xor     0, 0, 7\n\t"
+        "srwi    7, 19, 10\n\t"
+        "xor     0, 0, 7\n\t"
+        "add     21, 21, 0\n\t"
+        "add     21, 21, 30\n\t"
+        "\n"
+    "L_SHA256_transform_len_after_blk_5_%=: \n\t"
+        /* Round 6 */
+        "rotlwi  0, 14, 26\n\t"
+        "rotlwi  7, 14, 21\n\t"
+        "xor     0, 0, 7\n\t"
+        "rotlwi  7, 14, 7\n\t"
+        "xor     0, 0, 7\n\t"
+        "add     9, 9, 0\n\t"
+        "xor     0, 15, 8\n\t"
+        "and     0, 0, 14\n\t"
+        "xor     0, 0, 8\n\t"
+        "add     9, 9, 0\n\t"
+        "lwz     0, 24(6)\n\t"
+        "add     9, 9, 22\n\t"
+        "add     9, 9, 0\n\t"
+        "add     13, 13, 9\n\t"
+        "rotlwi  0, 10, 30\n\t"
+        "rotlwi  7, 10, 19\n\t"
+        "xor     0, 0, 7\n\t"
+        "rotlwi  7, 10, 10\n\t"
+        "xor     0, 0, 7\n\t"
+        "add     9, 9, 0\n\t"
+        "xor     7, 10, 11\n\t"
+        "xor     0, 11, 12\n\t"
+        "and     0, 0, 7\n\t"
+        "xor     0, 0, 11\n\t"
+        "add     9, 9, 0\n\t"
+        "mfctr   7\n\t"
+        "cmpwi   0, 7, 1\n\t"
+        "beq     0, L_SHA256_transform_len_after_blk_6_%=\n\t"
+        /* Calc new W[6] */
+        "rotlwi  0, 23, 25\n\t"
+        "rotlwi  7, 23, 14\n\t"
+        "xor     0, 0, 7\n\t"
+        "srwi    7, 23, 3\n\t"
+        "xor     0, 0, 7\n\t"
+        "add     22, 22, 0\n\t"
+        "rotlwi  0, 20, 15\n\t"
+        "rotlwi  7, 20, 13\n\t"
+        "xor     0, 0, 7\n\t"
+        "srwi    7, 20, 10\n\t"
+        "xor     0, 0, 7\n\t"
+        "add     22, 22, 0\n\t"
+        "add     22, 22, 31\n\t"
+        "\n"
+    "L_SHA256_transform_len_after_blk_6_%=: \n\t"
+        /* Round 7 */
+        "rotlwi  0, 13, 26\n\t"
+        "rotlwi  7, 13, 21\n\t"
+        "xor     0, 0, 7\n\t"
+        "rotlwi  7, 13, 7\n\t"
+        "xor     0, 0, 7\n\t"
+        "add     8, 8, 0\n\t"
+        "xor     0, 14, 15\n\t"
+        "and     0, 0, 13\n\t"
+        "xor     0, 0, 15\n\t"
+        "add     8, 8, 0\n\t"
+        "lwz     0, 28(6)\n\t"
+        "add     8, 8, 23\n\t"
+        "add     8, 8, 0\n\t"
+        "add     12, 12, 8\n\t"
+        "rotlwi  0, 9, 30\n\t"
+        "rotlwi  7, 9, 19\n\t"
+        "xor     0, 0, 7\n\t"
+        "rotlwi  7, 9, 10\n\t"
+        "xor     0, 0, 7\n\t"
+        "add     8, 8, 0\n\t"
+        "xor     7, 9, 10\n\t"
+        "xor     0, 10, 11\n\t"
+        "and     0, 0, 7\n\t"
+        "xor     0, 0, 10\n\t"
+        "add     8, 8, 0\n\t"
+        "mfctr   7\n\t"
+        "cmpwi   0, 7, 1\n\t"
+        "beq     0, L_SHA256_transform_len_after_blk_7_%=\n\t"
+        /* Calc new W[7] */
+        "rotlwi  0, 24, 25\n\t"
+        "rotlwi  7, 24, 14\n\t"
+        "xor     0, 0, 7\n\t"
+        "srwi    7, 24, 3\n\t"
+        "xor     0, 0, 7\n\t"
+        "add     23, 23, 0\n\t"
+        "rotlwi  0, 21, 15\n\t"
+        "rotlwi  7, 21, 13\n\t"
+        "xor     0, 0, 7\n\t"
+        "srwi    7, 21, 10\n\t"
+        "xor     0, 0, 7\n\t"
+        "add     23, 23, 0\n\t"
+        "add     23, 23, 16\n\t"
+        "\n"
+    "L_SHA256_transform_len_after_blk_7_%=: \n\t"
+        /* Round 8 */
+        "rotlwi  0, 12, 26\n\t"
+        "rotlwi  7, 12, 21\n\t"
+        "xor     0, 0, 7\n\t"
+        "rotlwi  7, 12, 7\n\t"
+        "xor     0, 0, 7\n\t"
+        "add     15, 15, 0\n\t"
+        "xor     0, 13, 14\n\t"
+        "and     0, 0, 12\n\t"
+        "xor     0, 0, 14\n\t"
+        "add     15, 15, 0\n\t"
+        "lwz     0, 32(6)\n\t"
+        "add     15, 15, 24\n\t"
+        "add     15, 15, 0\n\t"
+        "add     11, 11, 15\n\t"
+        "rotlwi  0, 8, 30\n\t"
+        "rotlwi  7, 8, 19\n\t"
+        "xor     0, 0, 7\n\t"
+        "rotlwi  7, 8, 10\n\t"
+        "xor     0, 0, 7\n\t"
+        "add     15, 15, 0\n\t"
+        "xor     7, 8, 9\n\t"
+        "xor     0, 9, 10\n\t"
+        "and     0, 0, 7\n\t"
+        "xor     0, 0, 9\n\t"
+        "add     15, 15, 0\n\t"
+        "mfctr   7\n\t"
+        "cmpwi   0, 7, 1\n\t"
+        "beq     0, L_SHA256_transform_len_after_blk_8_%=\n\t"
+        /* Calc new W[8] */
+        "rotlwi  0, 25, 25\n\t"
+        "rotlwi  7, 25, 14\n\t"
+        "xor     0, 0, 7\n\t"
+        "srwi    7, 25, 3\n\t"
+        "xor     0, 0, 7\n\t"
+        "add     24, 24, 0\n\t"
+        "rotlwi  0, 22, 15\n\t"
+        "rotlwi  7, 22, 13\n\t"
+        "xor     0, 0, 7\n\t"
+        "srwi    7, 22, 10\n\t"
+        "xor     0, 0, 7\n\t"
+        "add     24, 24, 0\n\t"
+        "add     24, 24, 17\n\t"
+        "\n"
+    "L_SHA256_transform_len_after_blk_8_%=: \n\t"
+        /* Round 9 */
+        "rotlwi  0, 11, 26\n\t"
+        "rotlwi  7, 11, 21\n\t"
+        "xor     0, 0, 7\n\t"
+        "rotlwi  7, 11, 7\n\t"
+        "xor     0, 0, 7\n\t"
+        "add     14, 14, 0\n\t"
+        "xor     0, 12, 13\n\t"
+        "and     0, 0, 11\n\t"
+        "xor     0, 0, 13\n\t"
+        "add     14, 14, 0\n\t"
+        "lwz     0, 36(6)\n\t"
+        "add     14, 14, 25\n\t"
+        "add     14, 14, 0\n\t"
+        "add     10, 10, 14\n\t"
+        "rotlwi  0, 15, 30\n\t"
+        "rotlwi  7, 15, 19\n\t"
+        "xor     0, 0, 7\n\t"
+        "rotlwi  7, 15, 10\n\t"
+        "xor     0, 0, 7\n\t"
+        "add     14, 14, 0\n\t"
+        "xor     7, 15, 8\n\t"
+        "xor     0, 8, 9\n\t"
+        "and     0, 0, 7\n\t"
+        "xor     0, 0, 8\n\t"
+        "add     14, 14, 0\n\t"
+        "mfctr   7\n\t"
+        "cmpwi   0, 7, 1\n\t"
+        "beq     0, L_SHA256_transform_len_after_blk_9_%=\n\t"
+        /* Calc new W[9] */
+        "rotlwi  0, 26, 25\n\t"
+        "rotlwi  7, 26, 14\n\t"
+        "xor     0, 0, 7\n\t"
+        "srwi    7, 26, 3\n\t"
+        "xor     0, 0, 7\n\t"
+        "add     25, 25, 0\n\t"
+        "rotlwi  0, 23, 15\n\t"
+        "rotlwi  7, 23, 13\n\t"
+        "xor     0, 0, 7\n\t"
+        "srwi    7, 23, 10\n\t"
+        "xor     0, 0, 7\n\t"
+        "add     25, 25, 0\n\t"
+        "add     25, 25, 18\n\t"
+        "\n"
+    "L_SHA256_transform_len_after_blk_9_%=: \n\t"
+        /* Round 10 */
+        "rotlwi  0, 10, 26\n\t"
+        "rotlwi  7, 10, 21\n\t"
+        "xor     0, 0, 7\n\t"
+        "rotlwi  7, 10, 7\n\t"
+        "xor     0, 0, 7\n\t"
+        "add     13, 13, 0\n\t"
+        "xor     0, 11, 12\n\t"
+        "and     0, 0, 10\n\t"
+        "xor     0, 0, 12\n\t"
+        "add     13, 13, 0\n\t"
+        "lwz     0, 40(6)\n\t"
+        "add     13, 13, 26\n\t"
+        "add     13, 13, 0\n\t"
+        "add     9, 9, 13\n\t"
+        "rotlwi  0, 14, 30\n\t"
+        "rotlwi  7, 14, 19\n\t"
+        "xor     0, 0, 7\n\t"
+        "rotlwi  7, 14, 10\n\t"
+        "xor     0, 0, 7\n\t"
+        "add     13, 13, 0\n\t"
+        "xor     7, 14, 15\n\t"
+        "xor     0, 15, 8\n\t"
+        "and     0, 0, 7\n\t"
+        "xor     0, 0, 15\n\t"
+        "add     13, 13, 0\n\t"
+        "mfctr   7\n\t"
+        "cmpwi   0, 7, 1\n\t"
+        "beq     0, L_SHA256_transform_len_after_blk_10_%=\n\t"
+        /* Calc new W[10] */
+        "rotlwi  0, 27, 25\n\t"
+        "rotlwi  7, 27, 14\n\t"
+        "xor     0, 0, 7\n\t"
+        "srwi    7, 27, 3\n\t"
+        "xor     0, 0, 7\n\t"
+        "add     26, 26, 0\n\t"
+        "rotlwi  0, 24, 15\n\t"
+        "rotlwi  7, 24, 13\n\t"
+        "xor     0, 0, 7\n\t"
+        "srwi    7, 24, 10\n\t"
+        "xor     0, 0, 7\n\t"
+        "add     26, 26, 0\n\t"
+        "add     26, 26, 19\n\t"
+        "\n"
+    "L_SHA256_transform_len_after_blk_10_%=: \n\t"
+        /* Round 11 */
+        "rotlwi  0, 9, 26\n\t"
+        "rotlwi  7, 9, 21\n\t"
+        "xor     0, 0, 7\n\t"
+        "rotlwi  7, 9, 7\n\t"
+        "xor     0, 0, 7\n\t"
+        "add     12, 12, 0\n\t"
+        "xor     0, 10, 11\n\t"
+        "and     0, 0, 9\n\t"
+        "xor     0, 0, 11\n\t"
+        "add     12, 12, 0\n\t"
+        "lwz     0, 44(6)\n\t"
+        "add     12, 12, 27\n\t"
+        "add     12, 12, 0\n\t"
+        "add     8, 8, 12\n\t"
+        "rotlwi  0, 13, 30\n\t"
+        "rotlwi  7, 13, 19\n\t"
+        "xor     0, 0, 7\n\t"
+        "rotlwi  7, 13, 10\n\t"
+        "xor     0, 0, 7\n\t"
+        "add     12, 12, 0\n\t"
+        "xor     7, 13, 14\n\t"
+        "xor     0, 14, 15\n\t"
+        "and     0, 0, 7\n\t"
+        "xor     0, 0, 14\n\t"
+        "add     12, 12, 0\n\t"
+        "mfctr   7\n\t"
+        "cmpwi   0, 7, 1\n\t"
+        "beq     0, L_SHA256_transform_len_after_blk_11_%=\n\t"
+        /* Calc new W[11] */
+        "rotlwi  0, 28, 25\n\t"
+        "rotlwi  7, 28, 14\n\t"
+        "xor     0, 0, 7\n\t"
+        "srwi    7, 28, 3\n\t"
+        "xor     0, 0, 7\n\t"
+        "add     27, 27, 0\n\t"
+        "rotlwi  0, 25, 15\n\t"
+        "rotlwi  7, 25, 13\n\t"
+        "xor     0, 0, 7\n\t"
+        "srwi    7, 25, 10\n\t"
+        "xor     0, 0, 7\n\t"
+        "add     27, 27, 0\n\t"
+        "add     27, 27, 20\n\t"
+        "\n"
+    "L_SHA256_transform_len_after_blk_11_%=: \n\t"
+        /* Round 12 */
+        "rotlwi  0, 8, 26\n\t"
+        "rotlwi  7, 8, 21\n\t"
+        "xor     0, 0, 7\n\t"
+        "rotlwi  7, 8, 7\n\t"
+        "xor     0, 0, 7\n\t"
+        "add     11, 11, 0\n\t"
+        "xor     0, 9, 10\n\t"
+        "and     0, 0, 8\n\t"
+        "xor     0, 0, 10\n\t"
+        "add     11, 11, 0\n\t"
+        "lwz     0, 48(6)\n\t"
+        "add     11, 11, 28\n\t"
+        "add     11, 11, 0\n\t"
+        "add     15, 15, 11\n\t"
+        "rotlwi  0, 12, 30\n\t"
+        "rotlwi  7, 12, 19\n\t"
+        "xor     0, 0, 7\n\t"
+        "rotlwi  7, 12, 10\n\t"
+        "xor     0, 0, 7\n\t"
+        "add     11, 11, 0\n\t"
+        "xor     7, 12, 13\n\t"
+        "xor     0, 13, 14\n\t"
+        "and     0, 0, 7\n\t"
+        "xor     0, 0, 13\n\t"
+        "add     11, 11, 0\n\t"
+        "mfctr   7\n\t"
+        "cmpwi   0, 7, 1\n\t"
+        "beq     0, L_SHA256_transform_len_after_blk_12_%=\n\t"
+        /* Calc new W[12] */
+        "rotlwi  0, 29, 25\n\t"
+        "rotlwi  7, 29, 14\n\t"
+        "xor     0, 0, 7\n\t"
+        "srwi    7, 29, 3\n\t"
+        "xor     0, 0, 7\n\t"
+        "add     28, 28, 0\n\t"
+        "rotlwi  0, 26, 15\n\t"
+        "rotlwi  7, 26, 13\n\t"
+        "xor     0, 0, 7\n\t"
+        "srwi    7, 26, 10\n\t"
+        "xor     0, 0, 7\n\t"
+        "add     28, 28, 0\n\t"
+        "add     28, 28, 21\n\t"
+        "\n"
+    "L_SHA256_transform_len_after_blk_12_%=: \n\t"
+        /* Round 13 */
+        "rotlwi  0, 15, 26\n\t"
+        "rotlwi  7, 15, 21\n\t"
+        "xor     0, 0, 7\n\t"
+        "rotlwi  7, 15, 7\n\t"
+        "xor     0, 0, 7\n\t"
+        "add     10, 10, 0\n\t"
+        "xor     0, 8, 9\n\t"
+        "and     0, 0, 15\n\t"
+        "xor     0, 0, 9\n\t"
+        "add     10, 10, 0\n\t"
+        "lwz     0, 52(6)\n\t"
+        "add     10, 10, 29\n\t"
+        "add     10, 10, 0\n\t"
+        "add     14, 14, 10\n\t"
+        "rotlwi  0, 11, 30\n\t"
+        "rotlwi  7, 11, 19\n\t"
+        "xor     0, 0, 7\n\t"
+        "rotlwi  7, 11, 10\n\t"
+        "xor     0, 0, 7\n\t"
+        "add     10, 10, 0\n\t"
+        "xor     7, 11, 12\n\t"
+        "xor     0, 12, 13\n\t"
+        "and     0, 0, 7\n\t"
+        "xor     0, 0, 12\n\t"
+        "add     10, 10, 0\n\t"
+        "mfctr   7\n\t"
+        "cmpwi   0, 7, 1\n\t"
+        "beq     0, L_SHA256_transform_len_after_blk_13_%=\n\t"
+        /* Calc new W[13] */
+        "rotlwi  0, 30, 25\n\t"
+        "rotlwi  7, 30, 14\n\t"
+        "xor     0, 0, 7\n\t"
+        "srwi    7, 30, 3\n\t"
+        "xor     0, 0, 7\n\t"
+        "add     29, 29, 0\n\t"
+        "rotlwi  0, 27, 15\n\t"
+        "rotlwi  7, 27, 13\n\t"
+        "xor     0, 0, 7\n\t"
+        "srwi    7, 27, 10\n\t"
+        "xor     0, 0, 7\n\t"
+        "add     29, 29, 0\n\t"
+        "add     29, 29, 22\n\t"
+        "\n"
+    "L_SHA256_transform_len_after_blk_13_%=: \n\t"
+        /* Round 14 */
+        "rotlwi  0, 14, 26\n\t"
+        "rotlwi  7, 14, 21\n\t"
+        "xor     0, 0, 7\n\t"
+        "rotlwi  7, 14, 7\n\t"
+        "xor     0, 0, 7\n\t"
+        "add     9, 9, 0\n\t"
+        "xor     0, 15, 8\n\t"
+        "and     0, 0, 14\n\t"
+        "xor     0, 0, 8\n\t"
+        "add     9, 9, 0\n\t"
+        "lwz     0, 56(6)\n\t"
+        "add     9, 9, 30\n\t"
+        "add     9, 9, 0\n\t"
+        "add     13, 13, 9\n\t"
+        "rotlwi  0, 10, 30\n\t"
+        "rotlwi  7, 10, 19\n\t"
+        "xor     0, 0, 7\n\t"
+        "rotlwi  7, 10, 10\n\t"
+        "xor     0, 0, 7\n\t"
+        "add     9, 9, 0\n\t"
+        "xor     7, 10, 11\n\t"
+        "xor     0, 11, 12\n\t"
+        "and     0, 0, 7\n\t"
+        "xor     0, 0, 11\n\t"
+        "add     9, 9, 0\n\t"
+        "mfctr   7\n\t"
+        "cmpwi   0, 7, 1\n\t"
+        "beq     0, L_SHA256_transform_len_after_blk_14_%=\n\t"
+        /* Calc new W[14] */
+        "rotlwi  0, 31, 25\n\t"
+        "rotlwi  7, 31, 14\n\t"
+        "xor     0, 0, 7\n\t"
+        "srwi    7, 31, 3\n\t"
+        "xor     0, 0, 7\n\t"
+        "add     30, 30, 0\n\t"
+        "rotlwi  0, 28, 15\n\t"
+        "rotlwi  7, 28, 13\n\t"
+        "xor     0, 0, 7\n\t"
+        "srwi    7, 28, 10\n\t"
+        "xor     0, 0, 7\n\t"
+        "add     30, 30, 0\n\t"
+        "add     30, 30, 23\n\t"
+        "\n"
+    "L_SHA256_transform_len_after_blk_14_%=: \n\t"
+        /* Round 15 */
+        "rotlwi  0, 13, 26\n\t"
+        "rotlwi  7, 13, 21\n\t"
+        "xor     0, 0, 7\n\t"
+        "rotlwi  7, 13, 7\n\t"
+        "xor     0, 0, 7\n\t"
+        "add     8, 8, 0\n\t"
+        "xor     0, 14, 15\n\t"
+        "and     0, 0, 13\n\t"
+        "xor     0, 0, 15\n\t"
+        "add     8, 8, 0\n\t"
+        "lwz     0, 60(6)\n\t"
+        "add     8, 8, 31\n\t"
+        "add     8, 8, 0\n\t"
+        "add     12, 12, 8\n\t"
+        "rotlwi  0, 9, 30\n\t"
+        "rotlwi  7, 9, 19\n\t"
+        "xor     0, 0, 7\n\t"
+        "rotlwi  7, 9, 10\n\t"
+        "xor     0, 0, 7\n\t"
+        "add     8, 8, 0\n\t"
+        "xor     7, 9, 10\n\t"
+        "xor     0, 10, 11\n\t"
+        "and     0, 0, 7\n\t"
+        "xor     0, 0, 10\n\t"
+        "add     8, 8, 0\n\t"
+        "mfctr   7\n\t"
+        "cmpwi   0, 7, 1\n\t"
+        "beq     0, L_SHA256_transform_len_after_blk_15_%=\n\t"
+        /* Calc new W[15] */
+        "rotlwi  0, 16, 25\n\t"
+        "rotlwi  7, 16, 14\n\t"
+        "xor     0, 0, 7\n\t"
+        "srwi    7, 16, 3\n\t"
+        "xor     0, 0, 7\n\t"
+        "add     31, 31, 0\n\t"
+        "rotlwi  0, 29, 15\n\t"
+        "rotlwi  7, 29, 13\n\t"
+        "xor     0, 0, 7\n\t"
+        "srwi    7, 29, 10\n\t"
+        "xor     0, 0, 7\n\t"
+        "add     31, 31, 0\n\t"
+        "add     31, 31, 24\n\t"
+        "\n"
+    "L_SHA256_transform_len_after_blk_15_%=: \n\t"
+        "addi    6, 6, 0x40\n\t"
+        "bdnz    L_SHA256_transform_len_start_%=\n\t"
+        "subi    6, 6, 0x100\n\t"
+#endif /* WOLFSSL_PPC32_ASM_SMALL */
         /* Add in digest from start */
         "lwz     0, 0(1)\n\t"
         "lwz     7, 4(1)\n\t"
@@ -1218,7 +1950,6 @@ void Transform_Sha256_Len(wc_Sha256* sha256, const byte* data, word32 len)
         "stw     13, 20(1)\n\t"
         "stw     14, 24(1)\n\t"
         "stw     15, 28(1)\n\t"
-        "subi    6, 6, 0xc0\n\t"
         "mtctr   %[len]\n\t"
         "addi    %[data], %[data], 0x40\n\t"
         "subi    %[len], %[len], 1\n\t"