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initial, somewhat draft implementation (native only so far, plus KAT-…
…based test)
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| Original file line number | Diff line number | Diff line change |
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| # Copyright (C) 2019 SCARV project <[email protected]> | ||
| # | ||
| # Use of this source code is restricted per the MIT license, a copy of which | ||
| # can be found at https://opensource.org/licenses/MIT (or should be included | ||
| # as LICENSE.txt within the associated archive or repository). | ||
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| ID = block/sm4 | ||
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| PATHS = ${REPO_HOME}/src/libscarv/${ID} | ||
| PATHS += ${REPO_HOME}/src/libscarv/${ID}/${ARCH} | ||
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| HEADERS = $(foreach PATH,${PATHS},$(wildcard ${PATH}/*.h)) | ||
| SOURCES = $(foreach PATH,${PATHS},$(wildcard ${PATH}/*.c)) | ||
| SOURCES += $(foreach PATH,${PATHS},$(wildcard ${PATH}/*.S)) | ||
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| $(eval $(call build,${ID},${PATHS},${HEADERS},${SOURCES})) | ||
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| /* Copyright (C) 2019 SCARV project <[email protected]> | ||
| * | ||
| * Use of this source code is restricted per the MIT license, a copy of which | ||
| * can be found at https://opensource.org/licenses/MIT (or should be included | ||
| * as LICENSE.txt within the associated archive or repository). | ||
| */ | ||
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| #include <scarv/block/sm4/sm4_dec.h> | ||
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| #if ( !LIBSCARV_CONF_SM4_DEC_EXP_STEP_EXTERN ) | ||
| uint32_t sm4_dec_exp_step( uint32_t* r, const uint32_t* k, uint32_t ck ) { | ||
| uint32_t t_0 = k[ 0 ]; | ||
| uint32_t t_1 = k[ 1 ]; | ||
| uint32_t t_2 = k[ 2 ]; | ||
| uint32_t t_3 = k[ 3 ]; | ||
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| uint32_t t_4 = t_0 ^ t_1 ^ t_2 ^ ck; | ||
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| t_4 = ( ( uint32_t )( SM4_SBOX[ ( t_4 >> 0 ) & 0xFF ] ) << 0 ) | | ||
| ( ( uint32_t )( SM4_SBOX[ ( t_4 >> 8 ) & 0xFF ] ) << 8 ) | | ||
| ( ( uint32_t )( SM4_SBOX[ ( t_4 >> 16 ) & 0xFF ] ) << 16 ) | | ||
| ( ( uint32_t )( SM4_SBOX[ ( t_4 >> 24 ) & 0xFF ] ) << 24 ) ; | ||
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| t_4 ^= U32_RTL( t_4, 13 ) ^ | ||
| U32_RTL( t_4, 23 ) ; | ||
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| t_4 ^= t_3; | ||
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| r[ 0 ] = t_4; | ||
| r[ 1 ] = t_0; | ||
| r[ 2 ] = t_1; | ||
| r[ 3 ] = t_2; | ||
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| return t_3; | ||
| } | ||
| #endif | ||
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| #if ( LIBSCARV_CONF_SM4_KEY_PRECOMP ) | ||
| void sm4_dec_exp( uint32_t* r, const uint8_t* k ) { | ||
| uint32_t t[ 4 ]; | ||
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| U8_TO_U32_BE( t[ 0 ], k, 0 ); | ||
| U8_TO_U32_BE( t[ 1 ], k, 4 ); | ||
| U8_TO_U32_BE( t[ 2 ], k, 8 ); | ||
| U8_TO_U32_BE( t[ 3 ], k, 12 ); | ||
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| #if ( LIBSCARV_CONF_SM4_KEY_EVOLVE_FWD ) | ||
| t[ 0 ] ^= SM4_FK[ 0 ]; | ||
| t[ 1 ] ^= SM4_FK[ 1 ]; | ||
| t[ 2 ] ^= SM4_FK[ 2 ]; | ||
| t[ 3 ] ^= SM4_FK[ 3 ]; | ||
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| for( int i = 0; i < 32; i++ ) { | ||
| r[ i ] = sm4_enc_exp_step( t, t, SM4_CK[ i ] ); | ||
| } | ||
| #endif | ||
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| #if ( LIBSCARV_CONF_SM4_KEY_EVOLVE_REV ) | ||
| for( int i = 0; i < 32; i++ ) { | ||
| r[ 32 - i - 1 ] = sm4_dec_exp_step( t, t, SM4_CK[ 32 - i - 1 ] ); | ||
| } | ||
| #endif | ||
| } | ||
| #endif | ||
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| #if ( !LIBSCARV_CONF_SM4_DEC_EXTERN ) | ||
| void sm4_dec( uint8_t* r, uint8_t* c, uint8_t* k ) { | ||
| #if ( !LIBSCARV_CONF_SM4_KEY_PRECOMP ) | ||
| uint32_t rk[ 4 ]; | ||
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| U8_TO_U32_BE( rk[ 0 ], k, 0 ); | ||
| U8_TO_U32_BE( rk[ 1 ], k, 4 ); | ||
| U8_TO_U32_BE( rk[ 2 ], k, 8 ); | ||
| U8_TO_U32_BE( rk[ 3 ], k, 12 ); | ||
| #else | ||
| uint32_t* rk = ( uint32_t* )( k ); | ||
| #endif | ||
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| uint32_t t_0, t_1, t_2, t_3, t_4; | ||
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| U8_TO_U32_BE( t_0, c, 0 ); | ||
| U8_TO_U32_BE( t_1, c, 4 ); | ||
| U8_TO_U32_BE( t_2, c, 8 ); | ||
| U8_TO_U32_BE( t_3, c, 12 ); | ||
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| #if ( !LIBSCARV_CONF_SM4_KEY_PRECOMP ) && ( LIBSCARV_CONF_SM4_KEY_EVOLVE_FWD ) | ||
| rk[ 0 ] ^= SM4_FK[ 0 ]; | ||
| rk[ 1 ] ^= SM4_FK[ 1 ]; | ||
| rk[ 2 ] ^= SM4_FK[ 2 ]; | ||
| rk[ 3 ] ^= SM4_FK[ 3 ]; | ||
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| for( int i = 0; i < 32; i++ ) { | ||
| sm4_enc_exp_step( rk, rk, SM4_CK[ i ] ); | ||
| } | ||
| #endif | ||
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| for( int i = 0; i < 32; i++ ) { | ||
| t_4 = t_1 ^ t_2 ^ t_3; | ||
| #if ( !LIBSCARV_CONF_SM4_KEY_PRECOMP ) | ||
| t_4 ^= sm4_dec_exp_step( rk, rk, SM4_CK[ 32 - i - 1 ] ); | ||
| #else | ||
| t_4 ^= rk[ 32 - i - 1 ]; | ||
| #endif | ||
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| t_4 = ( ( uint32_t )( SM4_SBOX[ ( t_4 >> 0 ) & 0xFF ] ) << 0 ) | | ||
| ( ( uint32_t )( SM4_SBOX[ ( t_4 >> 8 ) & 0xFF ] ) << 8 ) | | ||
| ( ( uint32_t )( SM4_SBOX[ ( t_4 >> 16 ) & 0xFF ] ) << 16 ) | | ||
| ( ( uint32_t )( SM4_SBOX[ ( t_4 >> 24 ) & 0xFF ] ) << 24 ) ; | ||
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| t_4 ^= U32_RTL( t_4, 2 ) ^ | ||
| U32_RTL( t_4, 10 ) ^ | ||
| U32_RTL( t_4, 18 ) ^ | ||
| U32_RTL( t_4, 24 ) ; | ||
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| t_4 ^= t_0; | ||
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| t_0 = t_1; | ||
| t_1 = t_2; | ||
| t_2 = t_3; | ||
| t_3 = t_4; | ||
| } | ||
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| U32_TO_U8_BE( r, t_3, 0 ); | ||
| U32_TO_U8_BE( r, t_2, 4 ); | ||
| U32_TO_U8_BE( r, t_1, 8 ); | ||
| U32_TO_U8_BE( r, t_0, 12 ); | ||
| } | ||
| #endif |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,25 @@ | ||
| /* Copyright (C) 2019 SCARV project <[email protected]> | ||
| * | ||
| * Use of this source code is restricted per the MIT license, a copy of which | ||
| * can be found at https://opensource.org/licenses/MIT (or should be included | ||
| * as LICENSE.txt within the associated archive or repository). | ||
| */ | ||
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| #ifndef __LIBSCARV_SM4_DEC_H | ||
| #define __LIBSCARV_SM4_DEC_H | ||
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| #include <scarv/share/conf.h> | ||
| #include <scarv/share/util.h> | ||
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| #include <scarv/block/sm4/sm4_share.h> | ||
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| #include <scarv/block/sm4/sm4_enc.h> | ||
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| #if ( LIBSCARV_CONF_SM4_KEY_PRECOMP ) | ||
| extern void sm4_dec_exp( uint32_t* r, const uint8_t* k ); | ||
| #endif | ||
| extern uint32_t sm4_dec_exp_step( uint32_t* r, const uint32_t* k, uint32_t ck ); | ||
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| extern void sm4_dec( uint8_t* r, uint8_t* m, uint8_t* k ); | ||
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| #endif |
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