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pkg/micro-ecc/psa_uecc: convert SEC 1 and micro-ecc key formats

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LP-HAW 2024-05-16 16:31:18 +02:00 committed by Lars
parent 3c4b23c801
commit 458b7c2496
2 changed files with 22 additions and 4 deletions
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13
pkg/micro-ecc/psa_uecc/p192.c
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@ -32,7 +32,15 @@ psa_status_t psa_generate_ecc_p192r1_key_pair( const psa_key_attributes_t *attr
const struct uECC_Curve_t *curve = uECC_secp192r1();
ret = uECC_make_key(pub_key_buffer, priv_key_buffer, curve);
/**
* Add 0x04 prefix for SEC 1 encoded uncompressed elliptic curve points.
* Micro-ECC represents public keys in SEC 1 uncompressed format without the 0x04 prefix [1].
* PSA Crypto uses a standard SEC 1 uncompressed representation [2].
* [1] https://github.com/kmackay/micro-ecc/blob/master/README.md#point-representation
* [2] https://arm-software.github.io/psa-api/crypto/1.1/api/keys/management.html#key-formats
*/
pub_key_buffer[0] = 0x04;
ret = uECC_make_key(pub_key_buffer+1, priv_key_buffer, curve);
if (!ret) {
return PSA_ERROR_GENERIC_ERROR;
}
@ -90,7 +98,8 @@ psa_status_t psa_ecc_p192r1_verify_hash(const psa_key_attributes_t *attributes,
int ret = 0;
const struct uECC_Curve_t *curve = uECC_secp192r1();
ret = uECC_verify(key_buffer, hash, hash_length, signature, curve);
/* Micro-ECC expects uncompressed public key without 0x04 prefix */
ret = uECC_verify(key_buffer+1, hash, hash_length, signature, curve);
if (!ret) {
return PSA_ERROR_GENERIC_ERROR;
}

13
pkg/micro-ecc/psa_uecc/p256.c
View File

@ -32,7 +32,15 @@ psa_status_t psa_generate_ecc_p256r1_key_pair( const psa_key_attributes_t *attr
const struct uECC_Curve_t *curve = uECC_secp256r1();
ret = uECC_make_key(pub_key_buffer, priv_key_buffer, curve);
/**
* Add 0x04 prefix for SEC 1 encoded uncompressed elliptic curve points.
* Micro-ECC represents public keys in SEC 1 uncompressed format without the 0x04 prefix [1].
* PSA Crypto uses a standard SEC 1 uncompressed representation [2].
* [1] https://github.com/kmackay/micro-ecc/blob/master/README.md#point-representation
* [2] https://arm-software.github.io/psa-api/crypto/1.1/api/keys/management.html#key-formats
*/
pub_key_buffer[0] = 0x04;
ret = uECC_make_key(pub_key_buffer+1, priv_key_buffer, curve);
if (!ret) {
return PSA_ERROR_GENERIC_ERROR;
}
@ -90,7 +98,8 @@ psa_status_t psa_ecc_p256r1_verify_hash(const psa_key_attributes_t *attributes,
int ret = 0;
const struct uECC_Curve_t *curve = uECC_secp256r1();
ret = uECC_verify(key_buffer, hash, hash_length, signature, curve);
/* Micro-ECC expects uncompressed public key without 0x04 prefix */
ret = uECC_verify(key_buffer+1, hash, hash_length, signature, curve);
if (!ret) {
return PSA_ERROR_GENERIC_ERROR;
}