Merge pull request #3425 from stevew817/montgomery-keys-clarification
Fix endianness handling of Curve25519 in PSA Crypto core
This commit is contained in:
commit
8f4f9a8daf
9 changed files with 145 additions and 28 deletions
9
ChangeLog.d/psa_curve25519_key_support.txt
Normal file
9
ChangeLog.d/psa_curve25519_key_support.txt
Normal file
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@ -0,0 +1,9 @@
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Features
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* The new function mbedtls_ecp_write_key() exports private ECC keys back to
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a byte buffer. It is the inverse of the existing mbedtls_ecp_read_key().
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Bugfix
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* Fix the endianness of Curve25519 keys imported/exported through the PSA
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APIs. psa_import_key and psa_export_key will now correctly expect/output
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Montgomery keys in little-endian as defined by RFC7748. Contributed by
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Steven Cooreman in #3425.
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@ -1149,6 +1149,26 @@ int mbedtls_ecp_gen_key( mbedtls_ecp_group_id grp_id, mbedtls_ecp_keypair *key,
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*/
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int mbedtls_ecp_read_key( mbedtls_ecp_group_id grp_id, mbedtls_ecp_keypair *key,
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const unsigned char *buf, size_t buflen );
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/**
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* \brief This function exports an elliptic curve private key.
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*
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* \param key The private key.
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* \param buf The output buffer for containing the binary representation
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* of the key. (Big endian integer for Weierstrass curves, byte
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* string for Montgomery curves.)
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* \param buflen The total length of the buffer in bytes.
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*
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* \return \c 0 on success.
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* \return #MBEDTLS_ERR_ECP_BUFFER_TOO_SMALL if the \p key
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representation is larger than the available space in \p buf.
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* \return #MBEDTLS_ERR_ECP_FEATURE_UNAVAILABLE if the operation for
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* the group is not implemented.
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* \return Another negative error code on different kinds of failure.
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*/
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int mbedtls_ecp_write_key( mbedtls_ecp_keypair *key,
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unsigned char *buf, size_t buflen );
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/**
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* \brief This function checks that the keypair objects
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* \p pub and \p prv have the same group and the
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@ -738,8 +738,9 @@ psa_status_t psa_import_key(const psa_key_attributes_t *attributes,
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* `PSA_ECC_FAMILY_CURVEXXX`), and in big-endian order for Weierstrass
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* curves (curve types `PSA_ECC_FAMILY_SECTXXX`, `PSA_ECC_FAMILY_SECPXXX`
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* and `PSA_ECC_FAMILY_BRAINPOOL_PXXX`).
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* This is the content of the `privateKey` field of the `ECPrivateKey`
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* format defined by RFC 5915.
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* For Weierstrass curves, this is the content of the `privateKey` field of
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* the `ECPrivateKey` format defined by RFC 5915. For Montgomery curves,
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* the format is defined by RFC 7748, and output is masked according to §5.
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* - For Diffie-Hellman key exchange key pairs (key types for which
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* #PSA_KEY_TYPE_IS_DH_KEY_PAIR is true), the
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* format is the representation of the private key `x` as a big-endian byte
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@ -3224,6 +3224,45 @@ cleanup:
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return( ret );
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}
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/*
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* Write a private key.
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*/
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int mbedtls_ecp_write_key( mbedtls_ecp_keypair *key,
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unsigned char *buf, size_t buflen )
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{
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int ret = MBEDTLS_ERR_ECP_FEATURE_UNAVAILABLE;
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ECP_VALIDATE_RET( key != NULL );
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ECP_VALIDATE_RET( buf != NULL );
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#if defined(ECP_MONTGOMERY)
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if( mbedtls_ecp_get_type( &key->grp ) == MBEDTLS_ECP_TYPE_MONTGOMERY )
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{
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if( key->grp.id == MBEDTLS_ECP_DP_CURVE25519 )
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{
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if( buflen < ECP_CURVE25519_KEY_SIZE )
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return MBEDTLS_ERR_ECP_BUFFER_TOO_SMALL;
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MBEDTLS_MPI_CHK( mbedtls_mpi_write_binary_le( &key->d, buf, buflen ) );
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}
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else
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ret = MBEDTLS_ERR_ECP_FEATURE_UNAVAILABLE;
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}
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#endif
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#if defined(ECP_SHORTWEIERSTRASS)
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if( mbedtls_ecp_get_type( &key->grp ) == MBEDTLS_ECP_TYPE_SHORT_WEIERSTRASS )
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{
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MBEDTLS_MPI_CHK( mbedtls_mpi_write_binary( &key->d, buf, buflen ) );
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}
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#endif
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cleanup:
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return( ret );
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}
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/*
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* Check a public-private key pair
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*/
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@ -164,7 +164,7 @@ static int pk_write_ec_private( unsigned char **p, unsigned char *start,
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size_t byte_length = ( ec->grp.pbits + 7 ) / 8;
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unsigned char tmp[MBEDTLS_ECP_MAX_BYTES];
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ret = mbedtls_mpi_write_binary( &ec->d, tmp, byte_length );
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ret = mbedtls_ecp_write_key( ec, tmp, byte_length );
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if( ret != 0 )
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goto exit;
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ret = mbedtls_asn1_write_octet_string( p, start, tmp, byte_length );
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@ -667,16 +667,12 @@ static psa_status_t psa_import_ec_private_key( psa_ecc_family_t curve,
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if( status != PSA_SUCCESS )
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goto exit;
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/* Load the secret value. */
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/* Load and validate the secret key */
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status = mbedtls_to_psa_error(
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mbedtls_mpi_read_binary( &ecp->d, data, data_length ) );
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if( status != PSA_SUCCESS )
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goto exit;
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/* Validate the private key. */
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status = mbedtls_to_psa_error(
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mbedtls_ecp_check_privkey( &ecp->grp, &ecp->d ) );
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mbedtls_ecp_read_key( ecp->grp.id, ecp, data, data_length ) );
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if( status != PSA_SUCCESS )
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goto exit;
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/* Calculate the public key from the private key. */
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status = mbedtls_to_psa_error(
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mbedtls_ecp_mul( &ecp->grp, &ecp->Q, &ecp->d, &ecp->grp.G,
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@ -1327,7 +1323,8 @@ static psa_status_t psa_internal_export_key( const psa_key_slot_t *slot,
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if( bytes > data_size )
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return( PSA_ERROR_BUFFER_TOO_SMALL );
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status = mbedtls_to_psa_error(
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mbedtls_mpi_write_binary( &slot->data.ecp->d, data, bytes ) );
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mbedtls_ecp_write_key( slot->data.ecp,
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data, bytes ) );
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if( status != PSA_SUCCESS )
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return( status );
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memset( data + bytes, 0, data_size - bytes );
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@ -278,65 +278,69 @@ mbedtls_ecp_gen_key:MBEDTLS_ECP_DP_SECP192R1
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ECP read key #1 (short weierstrass, too small)
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depends_on:MBEDTLS_ECP_DP_SECP192R1_ENABLED
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mbedtls_ecp_read_key:MBEDTLS_ECP_DP_SECP192R1:"00":MBEDTLS_ERR_ECP_INVALID_KEY
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mbedtls_ecp_read_key:MBEDTLS_ECP_DP_SECP192R1:"00":MBEDTLS_ERR_ECP_INVALID_KEY:0
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ECP read key #2 (short weierstrass, smallest)
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depends_on:MBEDTLS_ECP_DP_SECP192R1_ENABLED
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mbedtls_ecp_read_key:MBEDTLS_ECP_DP_SECP192R1:"01":0
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mbedtls_ecp_read_key:MBEDTLS_ECP_DP_SECP192R1:"01":0:1
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ECP read key #3 (short weierstrass, biggest)
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depends_on:MBEDTLS_ECP_DP_SECP192R1_ENABLED
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mbedtls_ecp_read_key:MBEDTLS_ECP_DP_SECP192R1:"FFFFFFFFFFFFFFFFFFFFFFFF99DEF836146BC9B1B4D22830":0
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mbedtls_ecp_read_key:MBEDTLS_ECP_DP_SECP192R1:"FFFFFFFFFFFFFFFFFFFFFFFF99DEF836146BC9B1B4D22830":0:1
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ECP read key #4 (short weierstrass, too big)
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depends_on:MBEDTLS_ECP_DP_SECP192R1_ENABLED
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mbedtls_ecp_read_key:MBEDTLS_ECP_DP_SECP192R1:"FFFFFFFFFFFFFFFFFFFFFFFF99DEF836146BC9B1B4D22831":MBEDTLS_ERR_ECP_INVALID_KEY
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mbedtls_ecp_read_key:MBEDTLS_ECP_DP_SECP192R1:"FFFFFFFFFFFFFFFFFFFFFFFF99DEF836146BC9B1B4D22831":MBEDTLS_ERR_ECP_INVALID_KEY:0
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ECP read key #5 (Curve25519, most significant bit set)
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depends_on:MBEDTLS_ECP_DP_CURVE25519_ENABLED
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mbedtls_ecp_read_key:MBEDTLS_ECP_DP_CURVE25519:"000000000000000000000000000000000000000000000000000000000000000C":0
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mbedtls_ecp_read_key:MBEDTLS_ECP_DP_CURVE25519:"00000000000000000000000000000000000000000000000000000000000000C0":0:0
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ECP read key #6 (Curve25519, second most significant bit unset)
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depends_on:MBEDTLS_ECP_DP_CURVE25519_ENABLED
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mbedtls_ecp_read_key:MBEDTLS_ECP_DP_CURVE25519:"0FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF3":0
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mbedtls_ecp_read_key:MBEDTLS_ECP_DP_CURVE25519:"F0FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF3F":0:0
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ECP read key #7 (Curve25519, msb OK)
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depends_on:MBEDTLS_ECP_DP_CURVE25519_ENABLED
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mbedtls_ecp_read_key:MBEDTLS_ECP_DP_CURVE25519:"0000000000000000000000000000000000000000000000000000000000000004":0
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mbedtls_ecp_read_key:MBEDTLS_ECP_DP_CURVE25519:"0000000000000000000000000000000000000000000000000000000000000040":0:1
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ECP read key #8 (Curve25519, bit 0 set)
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depends_on:MBEDTLS_ECP_DP_CURVE25519_ENABLED
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mbedtls_ecp_read_key:MBEDTLS_ECP_DP_CURVE25519:"1000000000000000000000000000000000000000000000000000000000000000":0
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mbedtls_ecp_read_key:MBEDTLS_ECP_DP_CURVE25519:"0100000000000000000000000000000000000000000000000000000000000040":0:0
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ECP read key #9 (Curve25519, bit 1 set)
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depends_on:MBEDTLS_ECP_DP_CURVE25519_ENABLED
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mbedtls_ecp_read_key:MBEDTLS_ECP_DP_CURVE25519:"2000000000000000000000000000000000000000000000000000000000000004":0
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mbedtls_ecp_read_key:MBEDTLS_ECP_DP_CURVE25519:"0200000000000000000000000000000000000000000000000000000000000040":0:0
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ECP read key #10 (Curve25519, bit 2 set)
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depends_on:MBEDTLS_ECP_DP_CURVE25519_ENABLED
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mbedtls_ecp_read_key:MBEDTLS_ECP_DP_CURVE25519:"4000000000000000000000000000000000000000000000000000000000000004":0
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mbedtls_ecp_read_key:MBEDTLS_ECP_DP_CURVE25519:"0400000000000000000000000000000000000000000000000000000000000040":0:0
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ECP read key #11 (Curve25519, OK)
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depends_on:MBEDTLS_ECP_DP_CURVE25519_ENABLED
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mbedtls_ecp_read_key:MBEDTLS_ECP_DP_CURVE25519:"8FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF7":0
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mbedtls_ecp_read_key:MBEDTLS_ECP_DP_CURVE25519:"F8FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF7F":0:1
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ECP read key #12 (Curve25519, too long)
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depends_on:MBEDTLS_ECP_DP_CURVE25519_ENABLED
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mbedtls_ecp_read_key:MBEDTLS_ECP_DP_CURVE25519:"00000000000000000000000000000000000000000000000000000000000000000C":MBEDTLS_ERR_ECP_INVALID_KEY
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mbedtls_ecp_read_key:MBEDTLS_ECP_DP_CURVE25519:"00000000000000000000000000000000000000000000000000000000000000000C":MBEDTLS_ERR_ECP_INVALID_KEY:0
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ECP read key #13 (Curve25519, not long enough)
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depends_on:MBEDTLS_ECP_DP_CURVE25519_ENABLED
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mbedtls_ecp_read_key:MBEDTLS_ECP_DP_CURVE25519:"0FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF3":MBEDTLS_ERR_ECP_INVALID_KEY
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mbedtls_ecp_read_key:MBEDTLS_ECP_DP_CURVE25519:"F0FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF3F":MBEDTLS_ERR_ECP_INVALID_KEY:0
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ECP read key #14 (Curve448, not supported)
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mbedtls_ecp_read_key:MBEDTLS_ECP_DP_CURVE448:"FCFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF":MBEDTLS_ERR_ECP_FEATURE_UNAVAILABLE
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mbedtls_ecp_read_key:MBEDTLS_ECP_DP_CURVE448:"FCFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF":MBEDTLS_ERR_ECP_FEATURE_UNAVAILABLE:0
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ECP read key #15 (Curve25519, not supported)
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depends_on:!MBEDTLS_ECP_DP_CURVE25519_ENABLED
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mbedtls_ecp_read_key:MBEDTLS_ECP_DP_CURVE25519:"8FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF7":MBEDTLS_ERR_ECP_FEATURE_UNAVAILABLE
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mbedtls_ecp_read_key:MBEDTLS_ECP_DP_CURVE25519:"F8FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF7F":MBEDTLS_ERR_ECP_FEATURE_UNAVAILABLE:0
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ECP read key #15 (invalid curve)
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mbedtls_ecp_read_key:INT_MAX:"8FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF7":MBEDTLS_ERR_ECP_FEATURE_UNAVAILABLE
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mbedtls_ecp_read_key:INT_MAX:"F8FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF7F":MBEDTLS_ERR_ECP_FEATURE_UNAVAILABLE:0
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ECP read key #16 (Curve25519 RFC, OK)
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depends_on:MBEDTLS_ECP_DP_CURVE25519_ENABLED
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mbedtls_ecp_read_key:MBEDTLS_ECP_DP_CURVE25519:"70076d0a7318a57d3c16c17251b26645df4c2f87ebc0992ab177fba51db92c6a":0:1
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ECP mod p192 small (more than 192 bits, less limbs than 2 * 192 bits)
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depends_on:MBEDTLS_ECP_DP_SECP192R1_ENABLED
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@ -1100,12 +1100,14 @@ exit:
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/* END_CASE */
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/* BEGIN_CASE */
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void mbedtls_ecp_read_key( int grp_id, data_t* in_key, int expected )
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void mbedtls_ecp_read_key( int grp_id, data_t* in_key, int expected, int canonical )
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{
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int ret = 0;
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mbedtls_ecp_keypair key;
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mbedtls_ecp_keypair key2;
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mbedtls_ecp_keypair_init( &key );
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mbedtls_ecp_keypair_init( &key2 );
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ret = mbedtls_ecp_read_key( grp_id, &key, in_key->x, in_key->len );
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TEST_ASSERT( ret == expected );
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@ -1114,10 +1116,39 @@ void mbedtls_ecp_read_key( int grp_id, data_t* in_key, int expected )
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{
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ret = mbedtls_ecp_check_privkey( &key.grp, &key.d );
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TEST_ASSERT( ret == 0 );
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if( canonical )
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{
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unsigned char buf[MBEDTLS_ECP_MAX_BYTES];
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ret = mbedtls_ecp_write_key( &key, buf, in_key->len );
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TEST_ASSERT( ret == 0 );
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ASSERT_COMPARE( in_key->x, in_key->len,
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buf, in_key->len );
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}
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else
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{
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unsigned char export1[MBEDTLS_ECP_MAX_BYTES];
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unsigned char export2[MBEDTLS_ECP_MAX_BYTES];
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ret = mbedtls_ecp_write_key( &key, export1, in_key->len );
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TEST_ASSERT( ret == 0 );
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ret = mbedtls_ecp_read_key( grp_id, &key2, export1, in_key->len );
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TEST_ASSERT( ret == expected );
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ret = mbedtls_ecp_write_key( &key2, export2, in_key->len );
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TEST_ASSERT( ret == 0 );
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ASSERT_COMPARE( export1, in_key->len,
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export2, in_key->len );
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}
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}
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exit:
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mbedtls_ecp_keypair_free( &key );
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mbedtls_ecp_keypair_free( &key2 );
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}
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/* END_CASE */
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@ -220,6 +220,22 @@ PSA import/export-public EC brainpool512r1: good
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depends_on:MBEDTLS_PK_PARSE_C:MBEDTLS_PK_WRITE_C:MBEDTLS_ECP_C:MBEDTLS_ECP_DP_BP512R1_ENABLED
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import_export_public_key:"372c9778f69f726cbca3f4a268f16b4d617d10280d79a6a029cd51879fe1012934dfe5395455337df6906dc7d6d2eea4dbb2065c0228f73b3ed716480e7d71d2":PSA_KEY_TYPE_ECC_KEY_PAIR(PSA_ECC_FAMILY_BRAINPOOL_P_R1):PSA_ALG_ECDSA_ANY:0:PSA_SUCCESS:"0438b7ec92b61c5c6c7fbc28a4ec759d48fcd4e2e374defd5c4968a54dbef7510e517886fbfc38ea39aa529359d70a7156c35d3cbac7ce776bdb251dd64bce71234424ee7049eed072f0dbc4d79996e175d557e263763ae97095c081e73e7db2e38adc3d4c9a0487b1ede876dc1fca61c902e9a1d8722b8612928f18a24845591a"
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PSA import/export EC curve25519 key pair: good (already properly masked)
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depends_on:MBEDTLS_PK_PARSE_C:MBEDTLS_PK_WRITE_C:MBEDTLS_ECP_C:MBEDTLS_ECP_DP_CURVE25519_ENABLED
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import_export:"70076d0a7318a57d3c16c17251b26645df4c2f87ebc0992ab177fba51db92c6a":PSA_KEY_TYPE_ECC_KEY_PAIR(PSA_ECC_FAMILY_MONTGOMERY):PSA_KEY_USAGE_EXPORT:PSA_ALG_ECDH:255:0:PSA_SUCCESS:1
|
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PSA import/export EC curve25519 key pair: unmasked input (check export-import-export yields properly masked output)
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depends_on:MBEDTLS_PK_PARSE_C:MBEDTLS_PK_WRITE_C:MBEDTLS_ECP_C:MBEDTLS_ECP_DP_CURVE25519_ENABLED
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import_export:"77076d0a7318a57d3c16c17251b26645df4c2f87ebc0992ab177fba51db92c2a":PSA_KEY_TYPE_ECC_KEY_PAIR(PSA_ECC_FAMILY_MONTGOMERY):PSA_KEY_USAGE_EXPORT:PSA_ALG_ECDH:255:0:PSA_SUCCESS:0
|
||||
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PSA import/export-public EC curve25519: accept unmasked input
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depends_on:MBEDTLS_PK_PARSE_C:MBEDTLS_PK_WRITE_C:MBEDTLS_ECP_C:MBEDTLS_ECP_DP_CURVE25519_ENABLED
|
||||
import_export_public_key:"77076d0a7318a57d3c16c17251b26645df4c2f87ebc0992ab177fba51db92c2a":PSA_KEY_TYPE_ECC_KEY_PAIR(PSA_ECC_FAMILY_MONTGOMERY):PSA_ALG_ECDH:0:PSA_SUCCESS:"8520f0098930a754748b7ddcb43ef75a0dbf3a0d26381af4eba4a98eaa9b4e6a"
|
||||
|
||||
PSA import/export-public EC curve25519: accept masked input
|
||||
depends_on:MBEDTLS_PK_PARSE_C:MBEDTLS_PK_WRITE_C:MBEDTLS_ECP_C:MBEDTLS_ECP_DP_CURVE25519_ENABLED
|
||||
import_export_public_key:"70076d0a7318a57d3c16c17251b26645df4c2f87ebc0992ab177fba51db92c6a":PSA_KEY_TYPE_ECC_KEY_PAIR(PSA_ECC_FAMILY_MONTGOMERY):PSA_ALG_ECDH:0:PSA_SUCCESS:"8520f0098930a754748b7ddcb43ef75a0dbf3a0d26381af4eba4a98eaa9b4e6a"
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||||
|
||||
PSA import/export-public: cannot export-public a symmetric key
|
||||
depends_on:MBEDTLS_PK_PARSE_C:MBEDTLS_PK_WRITE_C:MBEDTLS_RSA_C
|
||||
import_export_public_key:"2b7e151628aed2a6abf7158809cf4f3c":PSA_KEY_TYPE_AES:PSA_ALG_CBC_NO_PADDING:0:PSA_ERROR_INVALID_ARGUMENT:""
|
||||
|
|
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Reference in a new issue