diff options
Diffstat (limited to 'library/sha512.c')
| -rw-r--r-- | library/sha512.c | 72 |
1 files changed, 45 insertions, 27 deletions
diff --git a/library/sha512.c b/library/sha512.c index e881198..06a628a 100644 --- a/library/sha512.c +++ b/library/sha512.c @@ -232,8 +232,11 @@ int mbedtls_internal_sha512_process( mbedtls_sha512_context *ctx, const unsigned char data[128] ) { int i; - uint64_t temp1, temp2, W[80]; - uint64_t A[8]; + struct + { + uint64_t temp1, temp2, W[80]; + uint64_t A[8]; + } local; SHA512_VALIDATE_RET( ctx != NULL ); SHA512_VALIDATE_RET( (const unsigned char *)data != NULL ); @@ -250,64 +253,79 @@ int mbedtls_internal_sha512_process( mbedtls_sha512_context *ctx, #define F0(x,y,z) (((x) & (y)) | ((z) & ((x) | (y)))) #define F1(x,y,z) ((z) ^ ((x) & ((y) ^ (z)))) -#define P(a,b,c,d,e,f,g,h,x,K) \ - do \ - { \ - temp1 = (h) + S3(e) + F1((e),(f),(g)) + (K) + (x); \ - temp2 = S2(a) + F0((a),(b),(c)); \ - (d) += temp1; (h) = temp1 + temp2; \ +#define P(a,b,c,d,e,f,g,h,x,K) \ + do \ + { \ + local.temp1 = (h) + S3(e) + F1((e),(f),(g)) + (K) + (x); \ + local.temp2 = S2(a) + F0((a),(b),(c)); \ + (d) += local.temp1; (h) = local.temp1 + local.temp2; \ } while( 0 ) for( i = 0; i < 8; i++ ) - A[i] = ctx->state[i]; + local.A[i] = ctx->state[i]; #if defined(MBEDTLS_SHA512_SMALLER) for( i = 0; i < 80; i++ ) { if( i < 16 ) { - GET_UINT64_BE( W[i], data, i << 3 ); + GET_UINT64_BE( local.W[i], data, i << 3 ); } else { - W[i] = S1(W[i - 2]) + W[i - 7] + - S0(W[i - 15]) + W[i - 16]; + local.W[i] = S1(local.W[i - 2]) + local.W[i - 7] + + S0(local.W[i - 15]) + local.W[i - 16]; } - P( A[0], A[1], A[2], A[3], A[4], A[5], A[6], A[7], W[i], K[i] ); + P( local.A[0], local.A[1], local.A[2], local.A[3], local.A[4], + local.A[5], local.A[6], local.A[7], local.W[i], K[i] ); - temp1 = A[7]; A[7] = A[6]; A[6] = A[5]; A[5] = A[4]; A[4] = A[3]; - A[3] = A[2]; A[2] = A[1]; A[1] = A[0]; A[0] = temp1; + local.temp1 = local.A[7]; local.A[7] = local.A[6]; + local.A[6] = local.A[5]; local.A[5] = local.A[4]; + local.A[4] = local.A[3]; local.A[3] = local.A[2]; + local.A[2] = local.A[1]; local.A[1] = local.A[0]; + local.A[0] = local.temp1; } #else /* MBEDTLS_SHA512_SMALLER */ for( i = 0; i < 16; i++ ) { - GET_UINT64_BE( W[i], data, i << 3 ); + GET_UINT64_BE( local.W[i], data, i << 3 ); } for( ; i < 80; i++ ) { - W[i] = S1(W[i - 2]) + W[i - 7] + - S0(W[i - 15]) + W[i - 16]; + local.W[i] = S1(local.W[i - 2]) + local.W[i - 7] + + S0(local.W[i - 15]) + local.W[i - 16]; } i = 0; do { - P( A[0], A[1], A[2], A[3], A[4], A[5], A[6], A[7], W[i], K[i] ); i++; - P( A[7], A[0], A[1], A[2], A[3], A[4], A[5], A[6], W[i], K[i] ); i++; - P( A[6], A[7], A[0], A[1], A[2], A[3], A[4], A[5], W[i], K[i] ); i++; - P( A[5], A[6], A[7], A[0], A[1], A[2], A[3], A[4], W[i], K[i] ); i++; - P( A[4], A[5], A[6], A[7], A[0], A[1], A[2], A[3], W[i], K[i] ); i++; - P( A[3], A[4], A[5], A[6], A[7], A[0], A[1], A[2], W[i], K[i] ); i++; - P( A[2], A[3], A[4], A[5], A[6], A[7], A[0], A[1], W[i], K[i] ); i++; - P( A[1], A[2], A[3], A[4], A[5], A[6], A[7], A[0], W[i], K[i] ); i++; + P( local.A[0], local.A[1], local.A[2], local.A[3], local.A[4], + local.A[5], local.A[6], local.A[7], local.W[i], K[i] ); i++; + P( local.A[7], local.A[0], local.A[1], local.A[2], local.A[3], + local.A[4], local.A[5], local.A[6], local.W[i], K[i] ); i++; + P( local.A[6], local.A[7], local.A[0], local.A[1], local.A[2], + local.A[3], local.A[4], local.A[5], local.W[i], K[i] ); i++; + P( local.A[5], local.A[6], local.A[7], local.A[0], local.A[1], + local.A[2], local.A[3], local.A[4], local.W[i], K[i] ); i++; + P( local.A[4], local.A[5], local.A[6], local.A[7], local.A[0], + local.A[1], local.A[2], local.A[3], local.W[i], K[i] ); i++; + P( local.A[3], local.A[4], local.A[5], local.A[6], local.A[7], + local.A[0], local.A[1], local.A[2], local.W[i], K[i] ); i++; + P( local.A[2], local.A[3], local.A[4], local.A[5], local.A[6], + local.A[7], local.A[0], local.A[1], local.W[i], K[i] ); i++; + P( local.A[1], local.A[2], local.A[3], local.A[4], local.A[5], + local.A[6], local.A[7], local.A[0], local.W[i], K[i] ); i++; } while( i < 80 ); #endif /* MBEDTLS_SHA512_SMALLER */ for( i = 0; i < 8; i++ ) - ctx->state[i] += A[i]; + ctx->state[i] += local.A[i]; + + /* Zeroise buffers and variables to clear sensitive data from memory. */ + mbedtls_platform_zeroize( &local, sizeof( local ) ); return( 0 ); } |