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Refactored RSA to have random generator in every RSA operation

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Primarily so that rsa_private() receives an RNG for blinding purposes.
This commit is contained in:
Paul Bakker
2013-08-30 10:30:02 +02:00
parent ca174fef80
commit 548957dd49
11 changed files with 132 additions and 49 deletions
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57
library/rsa.c
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@ -257,12 +257,16 @@ cleanup:
* Do an RSA private key operation
*/
int rsa_private( rsa_context *ctx,
int (*f_rng)(void *, unsigned char *, size_t),
void *p_rng,
const unsigned char *input,
unsigned char *output )
{
int ret;
size_t olen;
mpi T, T1, T2;
((void) f_rng);
((void) p_rng);
mpi_init( &T ); mpi_init( &T1 ); mpi_init( &T2 );
@ -430,7 +434,7 @@ int rsa_rsaes_oaep_encrypt( rsa_context *ctx,
return( ( mode == RSA_PUBLIC )
? rsa_public( ctx, output, output )
: rsa_private( ctx, output, output ) );
: rsa_private( ctx, f_rng, p_rng, output, output ) );
}
#endif /* POLARSSL_PKCS1_V21 */
@ -492,7 +496,7 @@ int rsa_rsaes_pkcs1_v15_encrypt( rsa_context *ctx,
return( ( mode == RSA_PUBLIC )
? rsa_public( ctx, output, output )
: rsa_private( ctx, output, output ) );
: rsa_private( ctx, f_rng, p_rng, output, output ) );
}
/*
@ -527,7 +531,9 @@ int rsa_pkcs1_encrypt( rsa_context *ctx,
* Implementation of the PKCS#1 v2.1 RSAES-OAEP-DECRYPT function
*/
int rsa_rsaes_oaep_decrypt( rsa_context *ctx,
int mode,
int (*f_rng)(void *, unsigned char *, size_t),
void *p_rng,
int mode,
const unsigned char *label, size_t label_len,
size_t *olen,
const unsigned char *input,
@ -553,7 +559,7 @@ int rsa_rsaes_oaep_decrypt( rsa_context *ctx,
ret = ( mode == RSA_PUBLIC )
? rsa_public( ctx, input, buf )
: rsa_private( ctx, input, buf );
: rsa_private( ctx, f_rng, p_rng, input, buf );
if( ret != 0 )
return( ret );
@ -618,6 +624,8 @@ int rsa_rsaes_oaep_decrypt( rsa_context *ctx,
* Implementation of the PKCS#1 v2.1 RSAES-PKCS1-V1_5-DECRYPT function
*/
int rsa_rsaes_pkcs1_v15_decrypt( rsa_context *ctx,
int (*f_rng)(void *, unsigned char *, size_t),
void *p_rng,
int mode, size_t *olen,
const unsigned char *input,
unsigned char *output,
@ -639,7 +647,7 @@ int rsa_rsaes_pkcs1_v15_decrypt( rsa_context *ctx,
ret = ( mode == RSA_PUBLIC )
? rsa_public( ctx, input, buf )
: rsa_private( ctx, input, buf );
: rsa_private( ctx, f_rng, p_rng, input, buf );
if( ret != 0 )
return( ret );
@ -711,6 +719,8 @@ int rsa_rsaes_pkcs1_v15_decrypt( rsa_context *ctx,
* Do an RSA operation, then remove the message padding
*/
int rsa_pkcs1_decrypt( rsa_context *ctx,
int (*f_rng)(void *, unsigned char *, size_t),
void *p_rng,
int mode, size_t *olen,
const unsigned char *input,
unsigned char *output,
@ -719,13 +729,14 @@ int rsa_pkcs1_decrypt( rsa_context *ctx,
switch( ctx->padding )
{
case RSA_PKCS_V15:
return rsa_rsaes_pkcs1_v15_decrypt( ctx, mode, olen, input, output,
output_max_len );
return rsa_rsaes_pkcs1_v15_decrypt( ctx, f_rng, p_rng, mode, olen,
input, output, output_max_len );
#if defined(POLARSSL_PKCS1_V21)
case RSA_PKCS_V21:
return rsa_rsaes_oaep_decrypt( ctx, mode, NULL, 0, olen, input,
output, output_max_len );
return rsa_rsaes_oaep_decrypt( ctx, f_rng, p_rng, mode, NULL, 0,
olen, input, output,
output_max_len );
#endif
default:
@ -827,7 +838,7 @@ int rsa_rsassa_pss_sign( rsa_context *ctx,
return( ( mode == RSA_PUBLIC )
? rsa_public( ctx, sig, sig )
: rsa_private( ctx, sig, sig ) );
: rsa_private( ctx, f_rng, p_rng, sig, sig ) );
}
#endif /* POLARSSL_PKCS1_V21 */
@ -838,6 +849,8 @@ int rsa_rsassa_pss_sign( rsa_context *ctx,
* Do an RSA operation to sign the message digest
*/
int rsa_rsassa_pkcs1_v15_sign( rsa_context *ctx,
int (*f_rng)(void *, unsigned char *, size_t),
void *p_rng,
int mode,
md_type_t md_alg,
unsigned int hashlen,
@ -912,7 +925,7 @@ int rsa_rsassa_pkcs1_v15_sign( rsa_context *ctx,
return( ( mode == RSA_PUBLIC )
? rsa_public( ctx, sig, sig )
: rsa_private( ctx, sig, sig ) );
: rsa_private( ctx, f_rng, p_rng, sig, sig ) );
}
/*
@ -930,7 +943,7 @@ int rsa_pkcs1_sign( rsa_context *ctx,
switch( ctx->padding )
{
case RSA_PKCS_V15:
return rsa_rsassa_pkcs1_v15_sign( ctx, mode, md_alg,
return rsa_rsassa_pkcs1_v15_sign( ctx, f_rng, p_rng, mode, md_alg,
hashlen, hash, sig );
#if defined(POLARSSL_PKCS1_V21)
@ -949,6 +962,8 @@ int rsa_pkcs1_sign( rsa_context *ctx,
* Implementation of the PKCS#1 v2.1 RSASSA-PSS-VERIFY function
*/
int rsa_rsassa_pss_verify( rsa_context *ctx,
int (*f_rng)(void *, unsigned char *, size_t),
void *p_rng,
int mode,
md_type_t md_alg,
unsigned int hashlen,
@ -976,7 +991,7 @@ int rsa_rsassa_pss_verify( rsa_context *ctx,
ret = ( mode == RSA_PUBLIC )
? rsa_public( ctx, sig, buf )
: rsa_private( ctx, sig, buf );
: rsa_private( ctx, f_rng, p_rng, sig, buf );
if( ret != 0 )
return( ret );
@ -1059,6 +1074,8 @@ int rsa_rsassa_pss_verify( rsa_context *ctx,
* Implementation of the PKCS#1 v2.1 RSASSA-PKCS1-v1_5-VERIFY function
*/
int rsa_rsassa_pkcs1_v15_verify( rsa_context *ctx,
int (*f_rng)(void *, unsigned char *, size_t),
void *p_rng,
int mode,
md_type_t md_alg,
unsigned int hashlen,
@ -1083,7 +1100,7 @@ int rsa_rsassa_pkcs1_v15_verify( rsa_context *ctx,
ret = ( mode == RSA_PUBLIC )
? rsa_public( ctx, sig, buf )
: rsa_private( ctx, sig, buf );
: rsa_private( ctx, f_rng, p_rng, sig, buf );
if( ret != 0 )
return( ret );
@ -1173,6 +1190,8 @@ int rsa_rsassa_pkcs1_v15_verify( rsa_context *ctx,
* Do an RSA operation and check the message digest
*/
int rsa_pkcs1_verify( rsa_context *ctx,
int (*f_rng)(void *, unsigned char *, size_t),
void *p_rng,
int mode,
md_type_t md_alg,
unsigned int hashlen,
@ -1182,12 +1201,12 @@ int rsa_pkcs1_verify( rsa_context *ctx,
switch( ctx->padding )
{
case RSA_PKCS_V15:
return rsa_rsassa_pkcs1_v15_verify( ctx, mode, md_alg,
return rsa_rsassa_pkcs1_v15_verify( ctx, f_rng, p_rng, mode, md_alg,
hashlen, hash, sig );
#if defined(POLARSSL_PKCS1_V21)
case RSA_PKCS_V21:
return rsa_rsassa_pss_verify( ctx, mode, md_alg,
return rsa_rsassa_pss_verify( ctx, f_rng, p_rng, mode, md_alg,
hashlen, hash, sig );
#endif
@ -1355,7 +1374,7 @@ int rsa_self_test( int verbose )
memcpy( rsa_plaintext, RSA_PT, PT_LEN );
if( rsa_pkcs1_encrypt( &rsa, &myrand, NULL, RSA_PUBLIC, PT_LEN,
if( rsa_pkcs1_encrypt( &rsa, myrand, NULL, RSA_PUBLIC, PT_LEN,
rsa_plaintext, rsa_ciphertext ) != 0 )
{
if( verbose != 0 )
@ -1367,7 +1386,7 @@ int rsa_self_test( int verbose )
if( verbose != 0 )
printf( "passed\n PKCS#1 decryption : " );
if( rsa_pkcs1_decrypt( &rsa, RSA_PRIVATE, &len,
if( rsa_pkcs1_decrypt( &rsa, myrand, NULL, RSA_PRIVATE, &len,
rsa_ciphertext, rsa_decrypted,
sizeof(rsa_decrypted) ) != 0 )
{
@ -1403,7 +1422,7 @@ int rsa_self_test( int verbose )
if( verbose != 0 )
printf( "passed\n PKCS#1 sig. verify: " );
if( rsa_pkcs1_verify( &rsa, RSA_PUBLIC, POLARSSL_MD_SHA1, 0,
if( rsa_pkcs1_verify( &rsa, NULL, NULL, RSA_PUBLIC, POLARSSL_MD_SHA1, 0,
sha1sum, rsa_ciphertext ) != 0 )
{
if( verbose != 0 )