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Add an EC J-PAKE KDF to transform K -> SHA256(K.X) for TLS 1.2

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TLS uses it to derive the session secret. The algorithm takes a serialized
point in an uncompressed form, extracts the X coordinate and computes
SHA256 of it. It is only expected to work with P-256.
Fixes #5978.
Signed-off-by: Andrzej Kurek <andrzej.kurek@arm.com>
This commit is contained in:
Andrzej Kurek
2022-07-29 10:00:16 -04:00
parent f6a6a2d815
commit 08d34b8693
7 changed files with 129 additions and 11 deletions
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9
include/psa/crypto_struct.h
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@ -202,6 +202,12 @@ typedef struct
#endif /* MBEDTLS_PSA_BUILTIN_ALG_HKDF ||
MBEDTLS_PSA_BUILTIN_ALG_HKDF_EXTRACT ||
MBEDTLS_PSA_BUILTIN_ALG_HKDF_EXPAND */
#if defined(MBEDTLS_PSA_BUILTIN_ALG_TLS12_ECJPAKE_TO_PMS)
typedef struct
{
uint8_t MBEDTLS_PRIVATE(data)[PSA_TLS12_ECJPAKE_TO_PMS_DATA_SIZE];
} psa_tls12_ecjpake_to_pms_t;
#endif /* MBEDTLS_PSA_BUILTIN_ALG_TLS12_ECJPAKE_TO_PMS */
#if defined(MBEDTLS_PSA_BUILTIN_ALG_TLS12_PRF) || \
defined(MBEDTLS_PSA_BUILTIN_ALG_TLS12_PSK_TO_MS)
@ -266,6 +272,9 @@ struct psa_key_derivation_s
#if defined(MBEDTLS_PSA_BUILTIN_ALG_TLS12_PRF) || \
defined(MBEDTLS_PSA_BUILTIN_ALG_TLS12_PSK_TO_MS)
psa_tls12_prf_key_derivation_t MBEDTLS_PRIVATE(tls12_prf);
#endif
#if defined(MBEDTLS_PSA_BUILTIN_ALG_TLS12_ECJPAKE_TO_PMS)
psa_tls12_ecjpake_to_pms_t MBEDTLS_PRIVATE(tls12_ecjpake_to_pms);
#endif
} MBEDTLS_PRIVATE(ctx);
};