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| 1 // Copyright 2014 The Chromium Authors. All rights reserved. | |
| 2 // Use of this source code is governed by a BSD-style license that can be | |
| 3 // found in the LICENSE file. | |
| 4 | |
| 5 #include <openssl/ec.h> | |
| 6 #include <openssl/ec_key.h> | |
| 7 #include <openssl/evp.h> | |
| 8 | |
| 9 #include "base/logging.h" | |
| 10 #include "base/stl_util.h" | |
| 11 #include "components/webcrypto/algorithm_implementation.h" | |
| 12 #include "components/webcrypto/crypto_data.h" | |
| 13 #include "components/webcrypto/generate_key_result.h" | |
| 14 #include "components/webcrypto/openssl/ec_algorithm_openssl.h" | |
| 15 #include "components/webcrypto/openssl/key_openssl.h" | |
| 16 #include "components/webcrypto/openssl/util_openssl.h" | |
| 17 #include "components/webcrypto/status.h" | |
| 18 #include "components/webcrypto/webcrypto_util.h" | |
| 19 #include "crypto/openssl_util.h" | |
| 20 #include "crypto/scoped_openssl_types.h" | |
| 21 #include "crypto/secure_util.h" | |
| 22 #include "third_party/WebKit/public/platform/WebCryptoAlgorithmParams.h" | |
| 23 #include "third_party/WebKit/public/platform/WebCryptoKey.h" | |
| 24 #include "third_party/WebKit/public/platform/WebCryptoKeyAlgorithm.h" | |
| 25 | |
| 26 namespace webcrypto { | |
| 27 | |
| 28 namespace { | |
| 29 | |
| 30 // Extracts the OpenSSL key and digest from a WebCrypto key + algorithm. The | |
| 31 // returned pkey pointer will remain valid as long as |key| is alive. | |
| 32 Status GetPKeyAndDigest(const blink::WebCryptoAlgorithm& algorithm, | |
| 33 const blink::WebCryptoKey& key, | |
| 34 EVP_PKEY** pkey, | |
| 35 const EVP_MD** digest) { | |
| 36 *pkey = AsymKeyOpenSsl::Cast(key)->key(); | |
| 37 *digest = GetDigest(algorithm.ecdsaParams()->hash().id()); | |
| 38 if (!*digest) | |
| 39 return Status::ErrorUnsupported(); | |
| 40 return Status::Success(); | |
| 41 } | |
| 42 | |
| 43 // Gets the EC key's order size in bytes. | |
| 44 Status GetEcGroupOrderSize(EVP_PKEY* pkey, size_t* order_size_bytes) { | |
| 45 crypto::OpenSSLErrStackTracer err_tracer(FROM_HERE); | |
| 46 | |
| 47 crypto::ScopedEC_KEY ec(EVP_PKEY_get1_EC_KEY(pkey)); | |
| 48 if (!ec.get()) | |
| 49 return Status::ErrorUnexpected(); | |
| 50 | |
| 51 const EC_GROUP* group = EC_KEY_get0_group(ec.get()); | |
| 52 | |
| 53 crypto::ScopedBIGNUM order(BN_new()); | |
| 54 if (!EC_GROUP_get_order(group, order.get(), NULL)) | |
| 55 return Status::OperationError(); | |
| 56 | |
| 57 *order_size_bytes = BN_num_bytes(order.get()); | |
| 58 return Status::Success(); | |
| 59 } | |
| 60 | |
| 61 // Formats a DER-encoded signature (ECDSA-Sig-Value as specified in RFC 3279) to | |
| 62 // the signature format expected by WebCrypto (raw concatenated "r" and "s"). | |
| 63 // | |
| 64 // TODO(eroman): Where is the specification for WebCrypto's signature format? | |
| 65 Status ConvertDerSignatureToWebCryptoSignature( | |
| 66 EVP_PKEY* key, | |
| 67 std::vector<uint8_t>* signature) { | |
| 68 crypto::OpenSSLErrStackTracer err_tracer(FROM_HERE); | |
| 69 | |
| 70 const unsigned char* der_data = vector_as_array(signature); | |
| 71 crypto::ScopedECDSA_SIG ecdsa_sig( | |
| 72 d2i_ECDSA_SIG(NULL, &der_data, static_cast<long>(signature->size()))); | |
| 73 if (!ecdsa_sig.get()) | |
| 74 return Status::ErrorUnexpected(); | |
| 75 | |
| 76 // |der_data| is updated to point to past the end of the DER structure. | |
| 77 if (der_data != vector_as_array(signature) + signature->size()) | |
| 78 return Status::ErrorUnexpected(); | |
| 79 | |
| 80 // Determine the maximum length of r and s. | |
| 81 size_t order_size_bytes; | |
| 82 Status status = GetEcGroupOrderSize(key, &order_size_bytes); | |
| 83 if (status.IsError()) | |
| 84 return status; | |
| 85 | |
| 86 signature->resize(order_size_bytes * 2); | |
| 87 | |
| 88 if (!BN_bn2bin_padded(vector_as_array(signature), order_size_bytes, | |
| 89 ecdsa_sig.get()->r)) { | |
| 90 return Status::ErrorUnexpected(); | |
| 91 } | |
| 92 | |
| 93 if (!BN_bn2bin_padded(&(*signature)[order_size_bytes], order_size_bytes, | |
| 94 ecdsa_sig.get()->s)) { | |
| 95 return Status::ErrorUnexpected(); | |
| 96 } | |
| 97 | |
| 98 return Status::Success(); | |
| 99 } | |
| 100 | |
| 101 // Formats a WebCrypto ECDSA signature to a DER-encoded signature | |
| 102 // (ECDSA-Sig-Value as specified in RFC 3279). | |
| 103 // | |
| 104 // TODO(eroman): What is the specification for WebCrypto's signature format? | |
| 105 // | |
| 106 // If the signature length is incorrect (not 2 * order_size), then | |
| 107 // Status::Success() is returned and |*incorrect_length| is set to true; | |
| 108 // | |
| 109 // Otherwise on success, der_signature is filled with a ASN.1 encoded | |
| 110 // ECDSA-Sig-Value. | |
| 111 Status ConvertWebCryptoSignatureToDerSignature( | |
| 112 EVP_PKEY* key, | |
| 113 const CryptoData& signature, | |
| 114 std::vector<uint8_t>* der_signature, | |
| 115 bool* incorrect_length) { | |
| 116 crypto::OpenSSLErrStackTracer err_tracer(FROM_HERE); | |
| 117 | |
| 118 // Determine the length of r and s. | |
| 119 size_t order_size_bytes; | |
| 120 Status status = GetEcGroupOrderSize(key, &order_size_bytes); | |
| 121 if (status.IsError()) | |
| 122 return status; | |
| 123 | |
| 124 // If the size of the signature is incorrect, verification must fail. Success | |
| 125 // is returned here rather than an error, so that the caller can fail | |
| 126 // verification with a boolean, rather than reject the promise with an | |
| 127 // exception. | |
| 128 if (signature.byte_length() != 2 * order_size_bytes) { | |
| 129 *incorrect_length = true; | |
| 130 return Status::Success(); | |
| 131 } | |
| 132 | |
| 133 *incorrect_length = false; | |
| 134 | |
| 135 // Construct an ECDSA_SIG from |signature|. | |
| 136 crypto::ScopedECDSA_SIG ecdsa_sig(ECDSA_SIG_new()); | |
| 137 if (!ecdsa_sig) | |
| 138 return Status::OperationError(); | |
| 139 | |
| 140 if (!BN_bin2bn(signature.bytes(), order_size_bytes, ecdsa_sig->r) || | |
| 141 !BN_bin2bn(signature.bytes() + order_size_bytes, order_size_bytes, | |
| 142 ecdsa_sig->s)) { | |
| 143 return Status::ErrorUnexpected(); | |
| 144 } | |
| 145 | |
| 146 // Determine the size of the DER-encoded signature. | |
| 147 int der_encoding_size = i2d_ECDSA_SIG(ecdsa_sig.get(), NULL); | |
| 148 if (der_encoding_size < 0) | |
| 149 return Status::OperationError(); | |
| 150 | |
| 151 // DER-encode the signature. | |
| 152 der_signature->resize(der_encoding_size); | |
| 153 uint8_t* result = vector_as_array(der_signature); | |
| 154 if (0 > i2d_ECDSA_SIG(ecdsa_sig.get(), &result)) | |
| 155 return Status::OperationError(); | |
| 156 | |
| 157 return Status::Success(); | |
| 158 } | |
| 159 | |
| 160 class EcdsaImplementation : public EcAlgorithm { | |
| 161 public: | |
| 162 EcdsaImplementation() | |
| 163 : EcAlgorithm(blink::WebCryptoKeyUsageVerify, | |
| 164 blink::WebCryptoKeyUsageSign) {} | |
| 165 | |
| 166 const char* GetJwkAlgorithm( | |
| 167 const blink::WebCryptoNamedCurve curve) const override { | |
| 168 switch (curve) { | |
| 169 case blink::WebCryptoNamedCurveP256: | |
| 170 return "ES256"; | |
| 171 case blink::WebCryptoNamedCurveP384: | |
| 172 return "ES384"; | |
| 173 case blink::WebCryptoNamedCurveP521: | |
| 174 // This is not a typo! ES512 means P-521 with SHA-512. | |
| 175 return "ES512"; | |
| 176 default: | |
| 177 return NULL; | |
| 178 } | |
| 179 } | |
| 180 | |
| 181 Status Sign(const blink::WebCryptoAlgorithm& algorithm, | |
| 182 const blink::WebCryptoKey& key, | |
| 183 const CryptoData& data, | |
| 184 std::vector<uint8_t>* buffer) const override { | |
| 185 if (key.type() != blink::WebCryptoKeyTypePrivate) | |
| 186 return Status::ErrorUnexpectedKeyType(); | |
| 187 | |
| 188 crypto::OpenSSLErrStackTracer err_tracer(FROM_HERE); | |
| 189 crypto::ScopedEVP_MD_CTX ctx(EVP_MD_CTX_create()); | |
| 190 | |
| 191 EVP_PKEY* private_key = NULL; | |
| 192 const EVP_MD* digest = NULL; | |
| 193 Status status = GetPKeyAndDigest(algorithm, key, &private_key, &digest); | |
| 194 if (status.IsError()) | |
| 195 return status; | |
| 196 | |
| 197 // NOTE: A call to EVP_DigestSignFinal() with a NULL second parameter | |
| 198 // returns a maximum allocation size, while the call without a NULL returns | |
| 199 // the real one, which may be smaller. | |
| 200 size_t sig_len = 0; | |
| 201 if (!ctx.get() || | |
| 202 !EVP_DigestSignInit(ctx.get(), NULL, digest, NULL, private_key) || | |
| 203 !EVP_DigestSignUpdate(ctx.get(), data.bytes(), data.byte_length()) || | |
| 204 !EVP_DigestSignFinal(ctx.get(), NULL, &sig_len)) { | |
| 205 return Status::OperationError(); | |
| 206 } | |
| 207 | |
| 208 buffer->resize(sig_len); | |
| 209 if (!EVP_DigestSignFinal(ctx.get(), vector_as_array(buffer), &sig_len)) | |
| 210 return Status::OperationError(); | |
| 211 buffer->resize(sig_len); | |
| 212 | |
| 213 // ECDSA signing in BoringSSL outputs a DER-encoded (r,s). WebCrypto however | |
| 214 // expects a padded bitstring that is r concatenated to s. Convert to the | |
| 215 // expected format. | |
| 216 return ConvertDerSignatureToWebCryptoSignature(private_key, buffer); | |
| 217 } | |
| 218 | |
| 219 Status Verify(const blink::WebCryptoAlgorithm& algorithm, | |
| 220 const blink::WebCryptoKey& key, | |
| 221 const CryptoData& signature, | |
| 222 const CryptoData& data, | |
| 223 bool* signature_match) const override { | |
| 224 if (key.type() != blink::WebCryptoKeyTypePublic) | |
| 225 return Status::ErrorUnexpectedKeyType(); | |
| 226 | |
| 227 crypto::OpenSSLErrStackTracer err_tracer(FROM_HERE); | |
| 228 crypto::ScopedEVP_MD_CTX ctx(EVP_MD_CTX_create()); | |
| 229 | |
| 230 EVP_PKEY* public_key = NULL; | |
| 231 const EVP_MD* digest = NULL; | |
| 232 Status status = GetPKeyAndDigest(algorithm, key, &public_key, &digest); | |
| 233 if (status.IsError()) | |
| 234 return status; | |
| 235 | |
| 236 std::vector<uint8_t> der_signature; | |
| 237 bool incorrect_length_signature = false; | |
| 238 status = ConvertWebCryptoSignatureToDerSignature( | |
| 239 public_key, signature, &der_signature, &incorrect_length_signature); | |
| 240 if (status.IsError()) | |
| 241 return status; | |
| 242 | |
| 243 if (incorrect_length_signature) { | |
| 244 *signature_match = false; | |
| 245 return Status::Success(); | |
| 246 } | |
| 247 | |
| 248 if (!EVP_DigestVerifyInit(ctx.get(), NULL, digest, NULL, public_key) || | |
| 249 !EVP_DigestVerifyUpdate(ctx.get(), data.bytes(), data.byte_length())) { | |
| 250 return Status::OperationError(); | |
| 251 } | |
| 252 | |
| 253 *signature_match = | |
| 254 1 == EVP_DigestVerifyFinal(ctx.get(), vector_as_array(&der_signature), | |
| 255 der_signature.size()); | |
| 256 return Status::Success(); | |
| 257 } | |
| 258 }; | |
| 259 | |
| 260 } // namespace | |
| 261 | |
| 262 AlgorithmImplementation* CreatePlatformEcdsaImplementation() { | |
| 263 return new EcdsaImplementation; | |
| 264 } | |
| 265 | |
| 266 } // namespace webcrypto | |
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Chromium Code Reviews
Issue 1304063015:
[refactor] Rename the webcrypto/openssl and webcrypto/test directories. (Closed)
Base URL: https://chromium.googlesource.com/chromium/src.git@jwk_refactor