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EC key pair import: check the buffer size

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When importing a private elliptic curve key, require the input to have
exactly the right size. RFC 5915 requires the right size (you aren't
allowed to omit leading zeros). A different buffer size likely means
that something is wrong, e.g. a mismatch between the declared key type
and the actual data.
This commit is contained in:
Gilles Peskine 2019-05-13 14:21:57 +02:00
parent 536e20571a
commit 2c86ebc2f8
2 changed files with 7 additions and 0 deletions
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3
library/psa_crypto.c
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@ -621,6 +621,9 @@ static psa_status_t psa_import_ec_private_key( psa_ecc_curve_t curve,
mbedtls_ecp_keypair *ecp = NULL;
mbedtls_ecp_group_id grp_id = mbedtls_ecc_group_of_psa( curve );
if( PSA_BITS_TO_BYTES( PSA_ECC_CURVE_BITS( curve ) ) != data_length )
return( PSA_ERROR_INVALID_ARGUMENT );
*p_ecp = NULL;
ecp = mbedtls_calloc( 1, sizeof( mbedtls_ecp_keypair ) );
if( ecp == NULL )

4
tests/suites/test_suite_psa_crypto.data
View file

@ -278,6 +278,10 @@ PSA import EC keypair: DER format
depends_on:MBEDTLS_PK_PARSE_C:MBEDTLS_ECP_C:MBEDTLS_ECP_DP_SECP256R1_ENABLED
import:"3077020101042049c9a8c18c4b885638c431cf1df1c994131609b580d4fd43a0cab17db2f13eeea00a06082a8648ce3d030107a144034200047772656f814b399279d5e1f1781fac6f099a3c5ca1b0e35351834b08b65e0b572590cdaf8f769361bcf34acfc11e5e074e8426bdde04be6e653945449617de45":PSA_KEY_TYPE_ECC_KEYPAIR(PSA_ECC_CURVE_SECP256R1):PSA_ERROR_INVALID_ARGUMENT
PSA import EC keypair: too short
depends_on:MBEDTLS_PK_PARSE_C:MBEDTLS_ECP_C:MBEDTLS_ECP_DP_SECP256R1_ENABLED
import:"0123456789abcdef0123456789abcdef":PSA_KEY_TYPE_ECC_KEYPAIR(PSA_ECC_CURVE_SECP256R1):PSA_ERROR_INVALID_ARGUMENT
PSA import EC keypair: public key
depends_on:MBEDTLS_PK_PARSE_C:MBEDTLS_ECP_C:MBEDTLS_ECP_DP_SECP256R1_ENABLED
import:"04dea5e45d0ea37fc566232a508f4ad20ea13d47e4bf5fa4d54a57a0ba012042087097496efc583fed8b24a5b9be9a51de063f5a00a8b698a16fd7f29b5485f320":PSA_KEY_TYPE_ECC_KEYPAIR(PSA_ECC_CURVE_SECP256R1):PSA_ERROR_INVALID_ARGUMENT