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Implement SHA512_NO_SHA384 in sha512 module

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Saves 140 bytes on sha512.o, measured with:

arm-none-eabi-gcc -Wall -Wextra -Iinclude -Os -mcpu=cortex-m0plus -mthumb -c library/sha512.c && arm-none-eabi-size sha512.o

arm-none-eabi-gcc (GNU Tools for Arm Embedded Processors 7-2018-q2-update) 7.3.1 20180622 (release) [ARM/embedded-7-branch revision 261907]

Todo:
- fix selftest
- fix dependencies in test suites
- implement in MD layer
This commit is contained in:
Manuel Pégourié-Gonnard 2019-07-17 15:16:14 +02:00
parent ad6cb11461
commit 3df4e60561
2 changed files with 10 additions and 0 deletions
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2
include/mbedtls/sha512.h
View file

@ -59,8 +59,10 @@ typedef struct mbedtls_sha512_context
uint64_t total[2]; /*!< The number of Bytes processed. */
uint64_t state[8]; /*!< The intermediate digest state. */
unsigned char buffer[128]; /*!< The data block being processed. */
#if !defined(MBEDTLS_SHA512_NO_SHA384)
int is384; /*!< Determines which function to use:
0: Use SHA-512, or 1: Use SHA-384. */
#endif
}
mbedtls_sha512_context;

8
library/sha512.c
View file

@ -151,6 +151,9 @@ int mbedtls_sha512_starts_ret( mbedtls_sha512_context *ctx, int is384 )
}
else
{
#if defined(MBEDTLS_SHA512_NO_SHA384)
return( MBEDTLS_ERR_SHA512_BAD_INPUT_DATA );
#else
/* SHA-384 */
ctx->state[0] = UL64(0xCBBB9D5DC1059ED8);
ctx->state[1] = UL64(0x629A292A367CD507);
@ -160,9 +163,12 @@ int mbedtls_sha512_starts_ret( mbedtls_sha512_context *ctx, int is384 )
ctx->state[5] = UL64(0x8EB44A8768581511);
ctx->state[6] = UL64(0xDB0C2E0D64F98FA7);
ctx->state[7] = UL64(0x47B5481DBEFA4FA4);
#endif /* MBEDTLS_SHA512_NO_SHA384 */
}
#if !defined(MBEDTLS_SHA512_NO_SHA384)
ctx->is384 = is384;
#endif
return( 0 );
}
@ -437,7 +443,9 @@ int mbedtls_sha512_finish_ret( mbedtls_sha512_context *ctx,
sha512_put_uint64_be( ctx->state[4], output, 32 );
sha512_put_uint64_be( ctx->state[5], output, 40 );
#if !defined(MBEDTLS_SHA512_NO_SHA384)
if( ctx->is384 == 0 )
#endif
{
sha512_put_uint64_be( ctx->state[6], output, 48 );
sha512_put_uint64_be( ctx->state[7], output, 56 );