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psa: Simplify DSA key formats

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Remove front matter and DSS parameters from our DSA key formats, both
keypair and public key, to make it just a representation of the integer
private key, `x`, or the public key, `y`, respectively.
This commit is contained in:
Jaeden Amero 2019-01-11 13:50:43 +00:00 committed by Gilles Peskine
parent 283dfd1613
commit 1308fb517f
1 changed files with 23 additions and 40 deletions
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63
include/psa/crypto.h
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@ -378,6 +378,15 @@ psa_status_t psa_get_key_information(psa_key_handle_t handle,
* psa_generate_key().
*
* The format for the required domain parameters varies by the key type.
* - For DSA public keys (#PSA_KEY_TYPE_DSA_PUBLIC_KEY),
* the `Dss-Parms` format as defined by RFC 3279 §2.3.2.
* ```
* Dss-Parms ::= SEQUENCE {
* p INTEGER,
* q INTEGER,
* g INTEGER
* }
* ```
*
* \param handle Handle to the key to set domain parameters for.
* \param[in] data Buffer containing the key domain parameters. The content
@ -470,19 +479,10 @@ psa_status_t psa_get_key_domain_parameters(psa_key_handle_t handle,
* coefficient INTEGER, -- (inverse of q) mod p
* }
* ```
* - For DSA private keys (#PSA_KEY_TYPE_DSA_KEYPAIR), the format
* is the non-encrypted DER encoding of the representation used by
* OpenSSL and OpenSSH, whose structure is described in ASN.1 as follows:
* ```
* DSAPrivateKey ::= SEQUENCE {
* version INTEGER, -- must be 0
* prime INTEGER, -- p
* subprime INTEGER, -- q
* generator INTEGER, -- g
* public INTEGER, -- y
* private INTEGER, -- x
* }
* ```
* - For DSA private keys (#PSA_KEY_TYPE_DSA_KEYPAIR), the format is the
* representation of the private key `x` as a big-endian byte string. The
* length of the byte string is the private key size in bytes (leading zeroes
* are not stripped).
* - For elliptic curve key pairs (key types for which
* #PSA_KEY_TYPE_IS_ECC_KEYPAIR is true), the format is
* a representation of the private value as a `ceiling(m/8)`-byte string
@ -556,33 +556,10 @@ psa_status_t psa_export_key(psa_key_handle_t handle,
* - The byte 0x04;
* - `x_P` as a `ceiling(m/8)`-byte string, big-endian;
* - `y_P` as a `ceiling(m/8)`-byte string, big-endian.
*
* For other public key types, the format is the DER representation defined by
* RFC 5280 as `SubjectPublicKeyInfo`, with the `subjectPublicKey` format
* specified below.
* ```
* SubjectPublicKeyInfo ::= SEQUENCE {
* algorithm AlgorithmIdentifier,
* subjectPublicKey BIT STRING }
* AlgorithmIdentifier ::= SEQUENCE {
* algorithm OBJECT IDENTIFIER,
* parameters ANY DEFINED BY algorithm OPTIONAL }
* ```
* - For DSA public keys (#PSA_KEY_TYPE_DSA_PUBLIC_KEY),
* the `subjectPublicKey` format is defined by RFC 3279 §2.3.2 as
* `DSAPublicKey`,
* with the OID `id-dsa`,
* and with the parameters `DSS-Parms`.
* ```
* id-dsa OBJECT IDENTIFIER ::= {
* iso(1) member-body(2) us(840) x9-57(10040) x9cm(4) 1 }
*
* Dss-Parms ::= SEQUENCE {
* p INTEGER,
* q INTEGER,
* g INTEGER }
* DSAPublicKey ::= INTEGER -- public key, Y
* ```
* - For DSA public keys (#PSA_KEY_TYPE_DSA_PUBLIC_KEY), the format is the
* representation of the public key `y = g^x mod p` as a big-endian byte
* string. The length of the byte string is the length of the base prime `p`
* in bytes.
*
* \param handle Handle to the key to export.
* \param[out] data Buffer where the key data is to be written.
@ -2321,6 +2298,12 @@ typedef struct {
* specifying the public exponent. The
* default public exponent used when \p extra
* is \c NULL is 65537.
* - For an DSA key (\p type is
* #PSA_KEY_TYPE_DSA_KEYPAIR), \p extra is an
* optional structure specifying the key domain
* parameters. The key domain parameters can also be
* provided by psa_set_key_domain_parameters(),
* which documents the format of the structure.
* \param extra_size Size of the buffer that \p extra
* points to, in bytes. Note that if \p extra is
* \c NULL then \p extra_size must be zero.