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Key derivation: allow both keys and direct inputs

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Allow a direct input as the SECRET input step in a key derivation, in
addition to allowing DERIVE keys. This makes it easier for
applications to run a key derivation where the "secret" input is
obtained from somewhere else. This makes it possible for the "secret"
input to be empty (keys cannot be empty), which some protocols do (for
example the IV derivation in EAP-TLS).

Conversely, allow a RAW_DATA key as the INFO/LABEL/SALT/SEED input to a key
derivation, in addition to allowing direct inputs. This doesn't
improve security, but removes a step when a personalization parameter
is stored in the key store, and allows this personalization parameter
to remain opaque.

Add test cases that explore step/key-type-and-keyhood combinations.
This commit is contained in:
Gilles Peskine 2019-09-23 18:13:17 +02:00
parent 6842ba4d7a
commit 224b0d656a
4 changed files with 97 additions and 23 deletions
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48
tests/suites/test_suite_psa_crypto.data
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@ -1900,6 +1900,30 @@ PSA key derivation: HKDF-SHA-256, bad key type
depends_on:MBEDTLS_MD_C:MBEDTLS_SHA256_C
derive_input:PSA_ALG_HKDF(PSA_ALG_SHA_256):PSA_KEY_DERIVATION_INPUT_SALT:0:"":PSA_KEY_DERIVATION_INPUT_SECRET:PSA_KEY_TYPE_RAW_DATA:"0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b":PSA_KEY_DERIVATION_INPUT_INFO:0:"":PSA_SUCCESS:PSA_ERROR_INVALID_ARGUMENT:PSA_SUCCESS
PSA key derivation: HKDF-SHA-256, direct secret
depends_on:MBEDTLS_MD_C:MBEDTLS_SHA256_C
derive_input:PSA_ALG_HKDF(PSA_ALG_SHA_256):PSA_KEY_DERIVATION_INPUT_SALT:0:"":PSA_KEY_DERIVATION_INPUT_SECRET:0:"0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b":PSA_KEY_DERIVATION_INPUT_INFO:0:"":PSA_SUCCESS:PSA_SUCCESS:PSA_SUCCESS
PSA key derivation: HKDF-SHA-256, direct empty secret
depends_on:MBEDTLS_MD_C:MBEDTLS_SHA256_C
derive_input:PSA_ALG_HKDF(PSA_ALG_SHA_256):PSA_KEY_DERIVATION_INPUT_SALT:0:"":PSA_KEY_DERIVATION_INPUT_SECRET:0:"":PSA_KEY_DERIVATION_INPUT_INFO:0:"":PSA_SUCCESS:PSA_SUCCESS:PSA_SUCCESS
PSA key derivation: HKDF-SHA-256, RAW_DATA key as salt
depends_on:MBEDTLS_MD_C:MBEDTLS_SHA256_C
derive_input:PSA_ALG_HKDF(PSA_ALG_SHA_256):PSA_KEY_DERIVATION_INPUT_SALT:PSA_KEY_TYPE_RAW_DATA:"412073616c74":PSA_KEY_DERIVATION_INPUT_SECRET:PSA_KEY_TYPE_DERIVE:"0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b":PSA_KEY_DERIVATION_INPUT_INFO:0:"":PSA_SUCCESS:PSA_SUCCESS:PSA_SUCCESS
PSA key derivation: HKDF-SHA-256, RAW_DATA key as info
depends_on:MBEDTLS_MD_C:MBEDTLS_SHA256_C
derive_input:PSA_ALG_HKDF(PSA_ALG_SHA_256):PSA_KEY_DERIVATION_INPUT_SALT:0:"":PSA_KEY_DERIVATION_INPUT_SECRET:PSA_KEY_TYPE_DERIVE:"0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b":PSA_KEY_DERIVATION_INPUT_INFO:PSA_KEY_TYPE_RAW_DATA:"4120696e666f":PSA_SUCCESS:PSA_SUCCESS:PSA_SUCCESS
PSA key derivation: HKDF-SHA-256, DERIVE key as salt
depends_on:MBEDTLS_MD_C:MBEDTLS_SHA256_C
derive_input:PSA_ALG_HKDF(PSA_ALG_SHA_256):PSA_KEY_DERIVATION_INPUT_SALT:PSA_KEY_TYPE_DERIVE:"412073616c74":PSA_KEY_DERIVATION_INPUT_SECRET:PSA_KEY_TYPE_DERIVE:"0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b":PSA_KEY_DERIVATION_INPUT_INFO:0:"":PSA_ERROR_INVALID_ARGUMENT:PSA_ERROR_BAD_STATE:PSA_ERROR_BAD_STATE
PSA key derivation: HKDF-SHA-256, DERIVE key as info
depends_on:MBEDTLS_MD_C:MBEDTLS_SHA256_C
derive_input:PSA_ALG_HKDF(PSA_ALG_SHA_256):PSA_KEY_DERIVATION_INPUT_SALT:0:"":PSA_KEY_DERIVATION_INPUT_SECRET:PSA_KEY_TYPE_DERIVE:"0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b":PSA_KEY_DERIVATION_INPUT_INFO:PSA_KEY_TYPE_DERIVE:"4120696e666f":PSA_SUCCESS:PSA_SUCCESS:PSA_ERROR_INVALID_ARGUMENT
PSA key derivation: TLS 1.2 PRF SHA-256, good case
depends_on:MBEDTLS_MD_C:MBEDTLS_SHA256_C
derive_input:PSA_ALG_TLS12_PRF(PSA_ALG_SHA_256):PSA_KEY_DERIVATION_INPUT_SEED:0:"":PSA_KEY_DERIVATION_INPUT_SECRET:PSA_KEY_TYPE_DERIVE:"0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b":PSA_KEY_DERIVATION_INPUT_LABEL:0:"":PSA_SUCCESS:PSA_SUCCESS:PSA_SUCCESS
@ -1928,6 +1952,30 @@ PSA key derivation: TLS 1.2 PRF SHA-256, bad key type
depends_on:MBEDTLS_MD_C:MBEDTLS_SHA256_C
derive_input:PSA_ALG_TLS12_PRF(PSA_ALG_SHA_256):PSA_KEY_DERIVATION_INPUT_SEED:0:"":PSA_KEY_DERIVATION_INPUT_SECRET:PSA_KEY_TYPE_RAW_DATA:"0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b":PSA_KEY_DERIVATION_INPUT_LABEL:0:"":PSA_SUCCESS:PSA_ERROR_INVALID_ARGUMENT:PSA_ERROR_BAD_STATE
PSA key derivation: TLS 1.2 PRF SHA-256, direct secret
depends_on:MBEDTLS_MD_C:MBEDTLS_SHA256_C
derive_input:PSA_ALG_TLS12_PRF(PSA_ALG_SHA_256):PSA_KEY_DERIVATION_INPUT_SEED:0:"":PSA_KEY_DERIVATION_INPUT_SECRET:0:"0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b":PSA_KEY_DERIVATION_INPUT_LABEL:0:"":PSA_SUCCESS:PSA_SUCCESS:PSA_SUCCESS
PSA key derivation: TLS 1.2 PRF SHA-256, direct empty secret
depends_on:MBEDTLS_MD_C:MBEDTLS_SHA256_C
derive_input:PSA_ALG_TLS12_PRF(PSA_ALG_SHA_256):PSA_KEY_DERIVATION_INPUT_SEED:0:"":PSA_KEY_DERIVATION_INPUT_SECRET:0:"":PSA_KEY_DERIVATION_INPUT_LABEL:0:"":PSA_SUCCESS:PSA_SUCCESS:PSA_SUCCESS
PSA key derivation: TLS 1.2 PRF SHA-256, RAW_DATA key as seed
depends_on:MBEDTLS_MD_C:MBEDTLS_SHA256_C
derive_input:PSA_ALG_TLS12_PRF(PSA_ALG_SHA_256):PSA_KEY_DERIVATION_INPUT_SEED:PSA_KEY_TYPE_RAW_DATA:"612073656564":PSA_KEY_DERIVATION_INPUT_SECRET:PSA_KEY_TYPE_DERIVE:"0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b":PSA_KEY_DERIVATION_INPUT_LABEL:0:"":PSA_SUCCESS:PSA_SUCCESS:PSA_SUCCESS
PSA key derivation: TLS 1.2 PRF SHA-256, RAW_DATA key as label
depends_on:MBEDTLS_MD_C:MBEDTLS_SHA256_C
derive_input:PSA_ALG_TLS12_PRF(PSA_ALG_SHA_256):PSA_KEY_DERIVATION_INPUT_SEED:0:"":PSA_KEY_DERIVATION_INPUT_SECRET:PSA_KEY_TYPE_DERIVE:"0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b":PSA_KEY_DERIVATION_INPUT_LABEL:PSA_KEY_TYPE_RAW_DATA:"61206c6162656c":PSA_SUCCESS:PSA_SUCCESS:PSA_SUCCESS
PSA key derivation: TLS 1.2 PRF SHA-256, DERIVE key as seed
depends_on:MBEDTLS_MD_C:MBEDTLS_SHA256_C
derive_input:PSA_ALG_TLS12_PRF(PSA_ALG_SHA_256):PSA_KEY_DERIVATION_INPUT_SEED:PSA_KEY_TYPE_DERIVE:"612073656564":PSA_KEY_DERIVATION_INPUT_SECRET:PSA_KEY_TYPE_DERIVE:"0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b":PSA_KEY_DERIVATION_INPUT_LABEL:0:"":PSA_ERROR_INVALID_ARGUMENT:PSA_ERROR_BAD_STATE:PSA_ERROR_BAD_STATE
PSA key derivation: TLS 1.2 PRF SHA-256, DERIVE key as label
depends_on:MBEDTLS_MD_C:MBEDTLS_SHA256_C
derive_input:PSA_ALG_TLS12_PRF(PSA_ALG_SHA_256):PSA_KEY_DERIVATION_INPUT_SEED:0:"":PSA_KEY_DERIVATION_INPUT_SECRET:PSA_KEY_TYPE_DERIVE:"0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b":PSA_KEY_DERIVATION_INPUT_LABEL:PSA_KEY_TYPE_DERIVE:"61206c6162656c":PSA_SUCCESS:PSA_SUCCESS:PSA_ERROR_INVALID_ARGUMENT
PSA key derivation: TLS 1.2 PSK-to-MS, SHA-256, PSK too long (160 Bytes)
depends_on:MBEDTLS_MD_C:MBEDTLS_SHA256_C
derive_input:PSA_ALG_TLS12_PSK_TO_MS(PSA_ALG_SHA_256):PSA_KEY_DERIVATION_INPUT_SEED:0:"":PSA_KEY_DERIVATION_INPUT_SECRET:PSA_KEY_TYPE_DERIVE:"01020304050607080102030405060708010203040506070801020304050607080102030405060708010203040506070801020304050607080102030405060708010203040506070801020304050607080102030405060708010203040506070801020304050607080102030405060708010203040506070801020304050607080102030405060708010203040506070801020304050607080102030405060708":PSA_KEY_DERIVATION_INPUT_LABEL:0:"":PSA_SUCCESS:PSA_ERROR_INVALID_ARGUMENT:PSA_ERROR_BAD_STATE