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psa_util: convert_der_to_raw_single_int() accepts also all zero integers

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These values are not mathematically valid as signature, but as
for what it concerns with ECDSA conversion functions, 0 values
in DER format should be translated to 0 values in raw format.

Signed-off-by: Valerio Setti <valerio.setti@nordicsemi.no>
This commit is contained in:
Valerio Setti 2024-02-05 15:50:02 +01:00
parent 8334d00772
commit bec1d842ac
2 changed files with 16 additions and 12 deletions
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4
library/psa_util.c
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@ -493,10 +493,6 @@ static int convert_der_to_raw_single_int(unsigned char *der, size_t der_len,
p++;
unpadded_len--;
}
/* It should never happen that the input number has 0 length. */
if (unpadded_len == 0) {
return MBEDTLS_ERR_ASN1_INVALID_DATA;
}
if (unpadded_len > coordinate_size) {
/* Parsed number is longer than the maximum expected value. */

24
tests/suites/test_suite_psa_crypto_util.data
View file

@ -74,21 +74,29 @@ ECDSA DER -> Raw, 256bit, r with MSb set
depends_on:PSA_WANT_ECC_SECP_K1_256
ecdsa_der_to_raw:256:"3045022100911111111111111111111111111111111111111111111111111111111111111102202222222222222222222222222222222222222222222222222222222222222222":"91111111111111111111111111111111111111111111111111111111111111112222222222222222222222222222222222222222222222222222222222222222":0
ECDSA DER -> Raw, 256bit, Invalid r (only 1 zero byte)
ECDSA DER -> Raw, 256bit, Valid r all zeros
depends_on:PSA_WANT_ECC_SECP_K1_256
ecdsa_der_to_raw:256:"302502010002202222222222222222222222222222222222222222222222222222222222222222":"11111111111111111111111111111111111111111111111111111111111111112222222222222222222222222222222222222222222222222222222222222222":MBEDTLS_ERR_ASN1_INVALID_DATA
ecdsa_der_to_raw:256:"30440220000000000000000000000000000000000000000000000000000000000000000002202222222222222222222222222222222222222222222222222222222222222222":"00000000000000000000000000000000000000000000000000000000000000002222222222222222222222222222222222222222222222222222222222222222":0
ECDSA DER -> Raw, 256bit, Invalid s (only 1 zero byte)
ECDSA DER -> Raw, 256bit, Valid s all zeros
depends_on:PSA_WANT_ECC_SECP_K1_256
ecdsa_der_to_raw:256:"302502201111111111111111111111111111111111111111111111111111111111111111020100":"11111111111111111111111111111111111111111111111111111111111111112222222222222222222222222222222222222222222222222222222222222222":MBEDTLS_ERR_ASN1_INVALID_DATA
ecdsa_der_to_raw:256:"30440220111111111111111111111111111111111111111111111111111111111111111102200000000000000000000000000000000000000000000000000000000000000000":"11111111111111111111111111111111111111111111111111111111111111110000000000000000000000000000000000000000000000000000000000000000":0
ECDSA DER -> Raw, 256bit, Invalid r (0-length)
ECDSA DER -> Raw, 256bit, Valid r only 1 zero byte
depends_on:PSA_WANT_ECC_SECP_K1_256
ecdsa_der_to_raw:256:"3024020002202222222222222222222222222222222222222222222222222222222222222222":"00000000000000000000000000000000000000000000000000000000000000002222222222222222222222222222222222222222222222222222222222222222":MBEDTLS_ERR_ASN1_INVALID_DATA
ecdsa_der_to_raw:256:"302502010002202222222222222222222222222222222222222222222222222222222222222222":"00000000000000000000000000000000000000000000000000000000000000002222222222222222222222222222222222222222222222222222222222222222":0
ECDSA DER -> Raw, 256bit,Invalid s (0-length)
ECDSA DER -> Raw, 256bit, Valid s only 1 zero byte
depends_on:PSA_WANT_ECC_SECP_K1_256
ecdsa_der_to_raw:256:"3024022011111111111111111111111111111111111111111111111111111111111111110200":"11111111111111111111111111111111111111111111111111111111111111110000000000000000000000000000000000000000000000000000000000000000":MBEDTLS_ERR_ASN1_INVALID_DATA
ecdsa_der_to_raw:256:"302502201111111111111111111111111111111111111111111111111111111111111111020100":"11111111111111111111111111111111111111111111111111111111111111110000000000000000000000000000000000000000000000000000000000000000":0
ECDSA DER -> Raw, 256bit, Valid 0-length r
depends_on:PSA_WANT_ECC_SECP_K1_256
ecdsa_der_to_raw:256:"3024020002202222222222222222222222222222222222222222222222222222222222222222":"00000000000000000000000000000000000000000000000000000000000000002222222222222222222222222222222222222222222222222222222222222222":0
ECDSA DER -> Raw, 256bit, Valid 0-length s
depends_on:PSA_WANT_ECC_SECP_K1_256
ecdsa_der_to_raw:256:"3024022011111111111111111111111111111111111111111111111111111111111111110200":"11111111111111111111111111111111111111111111111111111111111111110000000000000000000000000000000000000000000000000000000000000000":0
# 512/521 bit sizes are useful to test sequence's length encoded with 2 bytes.
ECDSA Raw -> DER, 512bit, Success