Implement VerifySignedData() for ECDSA, RSA PKCS#1 and RSA PSS.

net/data/verify_signed_data_unittest/ecdsa-prime256v1-sha512.pem

Index: net/data/verify_signed_data_unittest/ecdsa-prime256v1-sha512.pem
diff --git a/net/data/verify_signed_data_unittest/ecdsa-prime256v1-sha512.pem b/net/data/verify_signed_data_unittest/ecdsa-prime256v1-sha512.pem
new file mode 100644
index 0000000000000000000000000000000000000000..54f490c10cff496667c340b3064c69aa8aedc35d
--- /dev/null
+++ b/net/data/verify_signed_data_unittest/ecdsa-prime256v1-sha512.pem
@@ -0,0 +1,49 @@
+The key, message, and signature come from:
+http://csrc.nist.gov/groups/STM/cavp/documents/dss/186-3ecdsatestvectors.zip (SigVer.rsp)
+
+The algorithm DER was synthesized to match, and the signature (provided as an r
+and s tuple) was encoded into a Ecdsa-Sig-Value and then a BIT STRING.
+
+It uses ECDSA verification, using curve prime256v1 and SHA-512
+
+
+
+-----BEGIN PUBLIC KEY-----
+MFkwEwYHKoZIzj0CAQYIKoZIzj0DAQcDQgAEnLDPaTA9r8dh1ORoe07PA55tNKuWSvgIENjVWKS
+o1vctUSM6F4iSCobuCKGWLHnvoxf7eHnil9rSFG25lfoceA==
+-----END PUBLIC KEY-----
+
+$ openssl asn1parse -i < [PUBLIC KEY]
+    0:d=0  hl=2 l=  89 cons: SEQUENCE          
+    2:d=1  hl=2 l=  19 cons:  SEQUENCE          
+    4:d=2  hl=2 l=   7 prim:   OBJECT            :id-ecPublicKey
+   13:d=2  hl=2 l=   8 prim:   OBJECT            :prime256v1
+   23:d=1  hl=2 l=  66 prim:  BIT STRING        
+
+
+
+-----BEGIN ALGORITHM-----
+MAoGCCqGSM49BAME
+-----END ALGORITHM-----
+
+$ openssl asn1parse -i < [ALGORITHM]
+    0:d=0  hl=2 l=  10 cons: SEQUENCE          
+    2:d=1  hl=2 l=   8 prim:  OBJECT            :ecdsa-with-SHA512
+
+
+
+-----BEGIN DATA-----
+bikyFTMBpO72gOZCiSmtrpiMEI1mijH/VdBImUfXX/gaRr+J6E1kAfAjvm6HaI+814TXhcqEZzV
+SSstS0ARSyEBApHnnzDMJNkQdk7vnIqlDKm4dsRK1yUA7ECcssTR/1hnUY/ep0iOtdv3gbYpog1
+APuEMjWr/5jiQb37VTjD4=
+-----END DATA-----
+
+
+
+-----BEGIN SIGNATURE-----
+A0cAMEQCIEufkeQoUocmGh0ckjz2Gc1SwXXP5/G+YKUljGEDSLo9AiAoxF+QHXHEGymGOOwNaoX
+X/LDDO7/sWpyBCEa2OSiahA==
+-----END SIGNATURE-----
+
+$ openssl asn1parse -i < [SIGNATURE]
+    0:d=0  hl=2 l=  71 prim: BIT STRING