openssl_csr_info and x509_certificate_info: return more public key information (#233)

* Return more public key information.

* Make sure bit size is converted to int first.

* Apply suggestions from code review

Co-authored-by: Ajpantuso <ajpantuso@gmail.com>

* Remove no longer necessary code.

* Use correct return value's name.

* Add trailing commas.

Co-authored-by: Ajpantuso <ajpantuso@gmail.com>

plugins/modules/openssl_csr_info.py

@@ -183,6 +183,77 @@ public_key:
     returned: success
     type: str
     sample: "-----BEGIN PUBLIC KEY-----\nMIICIjANBgkqhkiG9w0BAQEFAAOCAg8A..."
+public_key_type:
+    description:
+        - The CSR's public key's type.
+        - One of C(RSA), C(DSA), C(ECC), C(Ed25519), C(X25519), C(Ed448), or C(X448).
+        - Will start with C(unknown) if the key type cannot be determined.
+    returned: success
+    type: str
+    version_added: 1.7.0
+    sample: RSA
+public_key_data:
+    description:
+        - Public key data. Depends on the public key's type.
+    returned: success
+    type: dict
+    version_added: 1.7.0
+    contains:
+        size:
+            description:
+                - Bit size of modulus (RSA) or prime number (DSA).
+            type: int
+            returned: When C(public_key_type=RSA) or C(public_key_type=DSA)
+        modulus:
+            description:
+                - The RSA key's modulus.
+            type: int
+            returned: When C(public_key_type=RSA)
+        exponent:
+            description:
+                - The RSA key's public exponent.
+            type: int
+            returned: When C(public_key_type=RSA)
+        p:
+            description:
+                - The C(p) value for DSA.
+                - This is the prime modulus upon which arithmetic takes place.
+            type: int
+            returned: When C(public_key_type=DSA)
+        q:
+            description:
+                - The C(q) value for DSA.
+                - This is a prime that divides C(p - 1), and at the same time the order of the subgroup of the
+                  multiplicative group of the prime field used.
+            type: int
+            returned: When C(public_key_type=DSA)
+        g:
+            description:
+                - The C(g) value for DSA.
+                - This is the element spanning the subgroup of the multiplicative group of the prime field used.
+            type: int
+            returned: When C(public_key_type=DSA)
+        curve:
+            description:
+                - The curve's name for ECC.
+            type: str
+            returned: When C(public_key_type=ECC)
+        exponent_size:
+            description:
+                - The maximum number of bits of a private key. This is basically the bit size of the subgroup used.
+            type: int
+            returned: When C(public_key_type=ECC)
+        x:
+            description:
+                - The C(x) coordinate for the public point on the elliptic curve.
+            type: int
+            returned: When C(public_key_type=ECC)
+        y:
+            description:
+                - For C(public_key_type=ECC), this is the C(y) coordinate for the public point on the elliptic curve.
+                - For C(public_key_type=DSA), this is the publicly known group element whose discrete logarithm w.r.t. C(g) is the private key.
+            type: int
+            returned: When C(public_key_type=DSA) or C(public_key_type=ECC)
 public_key_fingerprints:
     description:
         - Fingerprints of CSR's public key.