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

net/data/verify_signed_data_unittest/rsa-pkcs1-sha256-key-encoded-ber.pem

Index: net/data/verify_signed_data_unittest/rsa-pkcs1-sha256-key-encoded-ber.pem
diff --git a/net/data/verify_signed_data_unittest/rsa-pkcs1-sha256-key-encoded-ber.pem b/net/data/verify_signed_data_unittest/rsa-pkcs1-sha256-key-encoded-ber.pem
new file mode 100644
index 0000000000000000000000000000000000000000..2a8db4a6b6a5c6e1fd2d25bd4946cf33becb447a
--- /dev/null
+++ b/net/data/verify_signed_data_unittest/rsa-pkcs1-sha256-key-encoded-ber.pem
@@ -0,0 +1,62 @@
+This is the same test as rsa-pkcs1-sha256.pem except the SPKI has been encoded
+using a non-minimal length for the outtermost SEQUENCE.
+
+Under DER, the tag-length-value encodings should be minimal and hence this should fail.
+
+Specifically the SPKI start was changed from:
+  30 81 9f 
+To:
+  30 82 00 9f 
+
+(the length of 0x9F is being expressed using 2 bytes instead of 1)
+
+
+
+-----BEGIN PUBLIC KEY-----
+MIIAnzANBgkqhkiG9w0BAQEFAAOBjQAwgYkCgYEAqkfgdjI9YqzadSZ2Ns0CEEUD8+8m7OplIx0
+94X+QD8mooNrunwT04asbLIINGL4qiI/+9IVSvyV3Kj9c4EeQIbANGoJ8AI3wf6MOBB/txxGFed
+qqcTffKVMQvtZdoYFbZ/MQkvyRsoyvunb/pWcN4sSaF9kY1bXSeP3J99fBIYUCAwEAAQ==
+-----END PUBLIC KEY-----
+
+$ openssl asn1parse -i < [PUBLIC KEY]
+    0:d=0  hl=4 l= 159 cons: SEQUENCE          
+    4:d=1  hl=2 l=  13 cons:  SEQUENCE          
+    6:d=2  hl=2 l=   9 prim:   OBJECT            :rsaEncryption
+   17:d=2  hl=2 l=   0 prim:   NULL              
+   19:d=1  hl=3 l= 141 prim:  BIT STRING        
+
+
+
+-----BEGIN ALGORITHM-----
+MA0GCSqGSIb3DQEBCwUA
+-----END ALGORITHM-----
+
+$ openssl asn1parse -i < [ALGORITHM]
+    0:d=0  hl=2 l=  13 cons: SEQUENCE          
+    2:d=1  hl=2 l=   9 prim:  OBJECT            :sha256WithRSAEncryption
+   13:d=1  hl=2 l=   0 prim:  NULL              
+
+
+
+-----BEGIN DATA-----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+-----END DATA-----
+
+
+
+-----BEGIN SIGNATURE-----
+A4GBADrHSmFSJw/Gv7hs5PNzpaJwAri/sitarIZfzN/SjR+n8L8yeTEoiDb1+BkxlFvXvPHTaOK
+oO3WlslNNOxh1W5/JkYYGOUkCcyIjnln6qS560imcr3VNjomT/M8M2Iss+rJiKau1TRuaP7H8i6
++Gqf3saGdr8/LnvFAdNQvkalQt
+-----END SIGNATURE-----
+
+$ openssl asn1parse -i < [SIGNATURE]
+    0:d=0  hl=3 l= 129 prim: BIT STRING