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Improve documentation in pkparse.c

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State explicitly that `pk_parse_pkcs8_undencrypted_der` and `pk_parse_key_pkcs8_encrypted_der` are not responsible for
zeroizing and freeing the provided key buffer.
This commit is contained in:
Hanno Becker 2017-09-29 19:18:51 +01:00
parent f04111f5c5
commit b4274210a4
1 changed files with 16 additions and 1 deletions
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17
library/pkparse.c
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@ -844,6 +844,16 @@ static int pk_parse_key_sec1_der( mbedtls_ecp_keypair *eck,
/* /*
* Parse an unencrypted PKCS#8 encoded private key * Parse an unencrypted PKCS#8 encoded private key
*
* Notes:
*
* - This function does not own the key buffer. It is the
* responsibility of the caller to take care of zeroizing
* and freeing it after use.
*
* - The function is responsible for freeing the provided
* PK context on failure.
*
*/ */
static int pk_parse_key_pkcs8_unencrypted_der( static int pk_parse_key_pkcs8_unencrypted_der(
mbedtls_pk_context *pk, mbedtls_pk_context *pk,
@ -932,6 +942,12 @@ static int pk_parse_key_pkcs8_unencrypted_der(
/* /*
* Parse an encrypted PKCS#8 encoded private key * Parse an encrypted PKCS#8 encoded private key
*
* To save space, the decryption happens in-place on the given key buffer.
* Also, while this function may modify the keybuffer, it doesn't own it,
* and instead it is the responsibility of the caller to zeroize and properly
* free it after use.
*
*/ */
#if defined(MBEDTLS_PKCS12_C) || defined(MBEDTLS_PKCS5_C) #if defined(MBEDTLS_PKCS12_C) || defined(MBEDTLS_PKCS5_C)
static int pk_parse_key_pkcs8_encrypted_der( static int pk_parse_key_pkcs8_encrypted_der(
@ -969,7 +985,6 @@ static int pk_parse_key_pkcs8_encrypted_der(
* *
* The EncryptedData OCTET STRING is a PKCS#8 PrivateKeyInfo * The EncryptedData OCTET STRING is a PKCS#8 PrivateKeyInfo
* *
* To save space, the decryption happens in-place on the given key buffer.
*/ */
if( ( ret = mbedtls_asn1_get_tag( &p, end, &len, if( ( ret = mbedtls_asn1_get_tag( &p, end, &len,
MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE ) ) != 0 ) MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE ) ) != 0 )