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Minor readability improvement

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Polish the beginning of mbedtls_rsa_rsaes_pkcs1_v15_decrypt a little,
to prepare for some behavior changes.
This commit is contained in:
Gilles Peskine 2018-10-02 22:43:06 +02:00
parent 5bcbd4e7f4
commit f7a8814b72
1 changed files with 7 additions and 8 deletions
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15
library/rsa.c
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@ -964,18 +964,20 @@ int mbedtls_rsa_rsaes_pkcs1_v15_decrypt( mbedtls_rsa_context *ctx,
int mode, size_t *olen, int mode, size_t *olen,
const unsigned char *input, const unsigned char *input,
unsigned char *output, unsigned char *output,
size_t output_max_len) size_t output_max_len )
{ {
int ret; int ret;
size_t ilen, pad_count = 0, i; size_t ilen = ctx->len;
unsigned char *p, bad, pad_done = 0; size_t pad_count = 0;
size_t i;
unsigned bad = 0;
unsigned char pad_done = 0;
unsigned char buf[MBEDTLS_MPI_MAX_SIZE]; unsigned char buf[MBEDTLS_MPI_MAX_SIZE];
unsigned char *p = buf;
if( mode == MBEDTLS_RSA_PRIVATE && ctx->padding != MBEDTLS_RSA_PKCS_V15 ) if( mode == MBEDTLS_RSA_PRIVATE && ctx->padding != MBEDTLS_RSA_PKCS_V15 )
return( MBEDTLS_ERR_RSA_BAD_INPUT_DATA ); return( MBEDTLS_ERR_RSA_BAD_INPUT_DATA );
ilen = ctx->len;
if( ilen < 16 || ilen > sizeof( buf ) ) if( ilen < 16 || ilen > sizeof( buf ) )
return( MBEDTLS_ERR_RSA_BAD_INPUT_DATA ); return( MBEDTLS_ERR_RSA_BAD_INPUT_DATA );
@ -986,9 +988,6 @@ int mbedtls_rsa_rsaes_pkcs1_v15_decrypt( mbedtls_rsa_context *ctx,
if( ret != 0 ) if( ret != 0 )
goto cleanup; goto cleanup;
p = buf;
bad = 0;
/* /*
* Check and get padding len in "constant-time" * Check and get padding len in "constant-time"
*/ */