ECC: blind private key after use in signing #7416
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SparkiDev
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dgarske
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May 13, 2024
| @@ -297,6 +297,48 @@ ECC Curve Sizes: | |||
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| #endif | |||
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| #ifdef WOLFSSL_ECC_BLIND_K | |||
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Please document WOLFSSL_BLIND_PRIVATE_KEY and WOLFSSL_ECC_BLIND_K at the top of ecc.c.
| void sp_xor_ct(const sp_int* a, const sp_int* b, int len, sp_int* r) | ||
| { | ||
| if ((a != NULL) && (b != NULL) && (r != NULL)) { | ||
| unsigned int i; |
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Is unsigned int the right type here? Should it be sp_digit or sp_int_digit?
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'i' is only used as an index.
It shouldn't be sp_int_digit.
| @@ -601,7 +612,17 @@ struct ecc_key { | |||
| #endif | |||
| }; | |||
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| #define wc_ecc_key_get_priv(key) ((key)->k) | |||
| #ifndef WOLFSSL_ECC_BLIND_K | |||
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Please add WOLFSSL_LOCAL or WOLFSSL_API to these....
$./configure CFLAGS="-DWOLFSSL_ECC_BLIND_K -DWOLFSSL_BLIND_PRIVATE_KEY" && make
...
/usr/bin/ld: wolfcrypt/test/test.o: in function `ecc_def_curve_test':
test.c:(.text+0x1ae8): undefined reference to `ecc_get_k'
/usr/bin/ld: test.c:(.text+0x1af4): undefined reference to `ecc_get_k'
/usr/bin/ld: test.c:(.text+0x1b00): undefined reference to `ecc_get_k'
collect2: error: ld returned 1 exit status
make[2]: *** [Makefile:6196: wolfcrypt/test/testwolfcrypt] Error 1
make[2]: *** Waiting for unfinished jobs....
make[2]: Leaving directory '/home/davidgarske/GitHub/wolfssl'
make[1]: *** [Makefile:8391: check-recursive] Error 1
make[1]: Leaving directory '/home/davidgarske/GitHub/wolfssl'
make: *** [Makefile:8860: check] Error 2
Use a mask to blind the private key after use so that stored private key is always changing.
When WOLFSSL_BLIND_PRIVATE_KEY is defined, blind the private key DER encoding so that stored private key data is always changing.
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retest this please |
dgarske
approved these changes
May 14, 2024
jefferyq2
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Jun 9, 2024
ECC: blind private key after use in signing
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Description
Use a mask to blind the private key after use so that stored private key is always changing.
Fixes zd#17783
Testing
./configure '--disable-shared' 'CFLAGS=-DWOLFSSL_ECC_BLIND_K'
Checklist