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crypto/signature_verifier.h

Index: crypto/signature_verifier.h
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+// Copyright (c) 2012 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef CRYPTO_SIGNATURE_VERIFIER_H_
+#define CRYPTO_SIGNATURE_VERIFIER_H_
+
+#include <vector>
+
+#include "build/build_config.h"
+#include "base/basictypes.h"
+#include "crypto/crypto_export.h"
+
+#if defined(USE_OPENSSL)
+typedef struct env_md_st EVP_MD;
+typedef struct evp_pkey_ctx_st EVP_PKEY_CTX;
+#else
+typedef struct HASHContextStr HASHContext;
+typedef struct SECKEYPublicKeyStr SECKEYPublicKey;
+typedef struct VFYContextStr VFYContext;
+#endif
+
+namespace crypto {
+
+// The SignatureVerifier class verifies a signature using a bare public key
+// (as opposed to a certificate).
+class CRYPTO_EXPORT SignatureVerifier {
+ public:
+  // The set of supported hash functions. Extend as required.
+  enum HashAlgorithm {
+    SHA1,
+    SHA256,
+  };
+
+  SignatureVerifier();
+  ~SignatureVerifier();
+
+  // Streaming interface:
+
+  // Initiates a signature verification operation.  This should be followed
+  // by one or more VerifyUpdate calls and a VerifyFinal call.
+  // NOTE: for RSA-PSS signatures, use VerifyInitRSAPSS instead.
+  //
+  // The signature algorithm is specified as a DER encoded ASN.1
+  // AlgorithmIdentifier structure:
+  //   AlgorithmIdentifier  ::=  SEQUENCE  {
+  //       algorithm               OBJECT IDENTIFIER,
+  //       parameters              ANY DEFINED BY algorithm OPTIONAL  }
+  //
+  // The signature is encoded according to the signature algorithm, but it
+  // must not be further encoded in an ASN.1 BIT STRING.
+  // Note: An RSA signature is actually a big integer.  It must be in
+  // big-endian byte order.
+  //
+  // The public key is specified as a DER encoded ASN.1 SubjectPublicKeyInfo
+  // structure, which contains not only the public key but also its type
+  // (algorithm):
+  //   SubjectPublicKeyInfo  ::=  SEQUENCE  {
+  //       algorithm            AlgorithmIdentifier,
+  //       subjectPublicKey     BIT STRING  }
+  bool VerifyInit(const uint8* signature_algorithm,
+                  int signature_algorithm_len,
+                  const uint8* signature,
+                  int signature_len,
+                  const uint8* public_key_info,
+                  int public_key_info_len);
+
+  // Initiates a RSA-PSS signature verification operation.  This should be
+  // followed by one or more VerifyUpdate calls and a VerifyFinal call.
+  //
+  // The RSA-PSS signature algorithm parameters are specified with the
+  // |hash_alg|, |mask_hash_alg|, and |salt_len| arguments.
+  //
+  // An RSA-PSS signature is a nonnegative integer encoded as a byte string
+  // (of the same length as the RSA modulus) in big-endian byte order. It
+  // must not be further encoded in an ASN.1 BIT STRING.
+  //
+  // The public key is specified as a DER encoded ASN.1 SubjectPublicKeyInfo
+  // structure, which contains not only the public key but also its type
+  // (algorithm):
+  //   SubjectPublicKeyInfo  ::=  SEQUENCE  {
+  //       algorithm            AlgorithmIdentifier,
+  //       subjectPublicKey     BIT STRING  }
+  bool VerifyInitRSAPSS(HashAlgorithm hash_alg,
+                        HashAlgorithm mask_hash_alg,
+                        int salt_len,
+                        const uint8* signature,
+                        int signature_len,
+                        const uint8* public_key_info,
+                        int public_key_info_len);
+
+  // Feeds a piece of the data to the signature verifier.
+  void VerifyUpdate(const uint8* data_part, int data_part_len);
+
+  // Concludes a signature verification operation.  Returns true if the
+  // signature is valid.  Returns false if the signature is invalid or an
+  // error occurred.
+  bool VerifyFinal();
+
+  // Note: we can provide a one-shot interface if there is interest:
+  //   bool Verify(const uint8* data,
+  //               int data_len,
+  //               const uint8* signature_algorithm,
+  //               int signature_algorithm_len,
+  //               const uint8* signature,
+  //               int signature_len,
+  //               const uint8* public_key_info,
+  //               int public_key_info_len);
+
+ private:
+#if defined(USE_OPENSSL)
+  bool CommonInit(const EVP_MD* digest,
+                  const uint8* signature,
+                  int signature_len,
+                  const uint8* public_key_info,
+                  int public_key_info_len,
+                  EVP_PKEY_CTX** pkey_ctx);
+#else
+  static SECKEYPublicKey* DecodePublicKeyInfo(const uint8* public_key_info,
+                                              int public_key_info_len);
+#endif
+
+  void Reset();
+
+  std::vector<uint8> signature_;
+
+#if defined(USE_OPENSSL)
+  struct VerifyContext;
+  VerifyContext* verify_context_;
+#else
+  // Used for all signature types except RSA-PSS.
+  VFYContext* vfy_context_;
+
+  // Used for RSA-PSS signatures.
+  HashAlgorithm hash_alg_;
+  HashAlgorithm mask_hash_alg_;
+  unsigned int salt_len_;
+  SECKEYPublicKey* public_key_;
+  HASHContext* hash_context_;
+#endif
+};
+
+}  // namespace crypto
+
+#endif  // CRYPTO_SIGNATURE_VERIFIER_H_