Bump ethereumjs-util from 6.2.0 to 7.0.0 (#2222)

* Bump ethereumjs-util from 6.2.0 to 7.0.0

Bumps [ethereumjs-util](https://github.com/ethereumjs/ethereumjs-util) from 6.2.0 to 7.0.0.
- [Release notes](https://github.com/ethereumjs/ethereumjs-util/releases)
- [Changelog](https://github.com/ethereumjs/ethereumjs-util/blob/master/CHANGELOG.md)
- [Commits](https://github.com/ethereumjs/ethereumjs-util/compare/v6.2.0...v7.0.0)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

* update use of ethereumjs-util

* fix use of keccak hash function

Co-authored-by: dependabot-preview[bot] <27856297+dependabot-preview[bot]@users.noreply.github.com>
Co-authored-by: Francisco Giordano <frangio.1@gmail.com>

package-lock.json

@@ -827,6 +827,21 @@
             }
           }
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+          "resolved": "https://registry.npmjs.org/ethereumjs-util/-/ethereumjs-util-6.2.0.tgz",
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+            "ethjs-util": "0.1.6",
+            "keccak": "^2.0.0",
+            "rlp": "^2.2.3",
+            "secp256k1": "^3.0.1"
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@@ -929,6 +944,26 @@
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+            "inherits": "^2.0.4",
+            "nan": "^2.14.0",
+            "safe-buffer": "^5.2.0"
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@@ -939,6 +974,12 @@
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@@ -948,6 +989,12 @@
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@@ -1414,6 +1461,51 @@
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+            "bn.js": "^4.11.0",
+            "create-hash": "^1.1.2",
+            "ethjs-util": "0.1.6",
+            "keccak": "^2.0.0",
+            "rlp": "^2.2.3",
+            "secp256k1": "^3.0.1"
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+          "resolved": "https://registry.npmjs.org/keccak/-/keccak-2.1.0.tgz",
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@@ -1463,6 +1555,21 @@
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+                "bn.js": "^4.11.0",
+                "create-hash": "^1.1.2",
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+                "secp256k1": "^3.0.1"
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@@ -1510,6 +1617,38 @@
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@@ -1949,6 +2088,21 @@
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+            "ethereumjs-util": {
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@@ -1978,6 +2132,26 @@
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@@ -2009,6 +2189,12 @@
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@@ -2637,6 +2823,23 @@
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+                "bn.js": "^4.11.0",
+                "create-hash": "^1.1.2",
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+                "keccak": "^2.0.0",
+                "rlp": "^2.2.3",
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@@ -2645,6 +2848,38 @@
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+          "requires": {
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+            "inherits": "^2.0.4",
+            "nan": "^2.14.0",
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@@ -3082,6 +3317,23 @@
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+                "bn.js": "^4.11.0",
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@@ -3090,6 +3342,38 @@
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+          "dev": true
+        },
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+          "resolved": "https://registry.npmjs.org/safe-buffer/-/safe-buffer-5.2.0.tgz",
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@@ -3474,6 +3758,23 @@
           "requires": {
             "ethereumjs-common": "^1.3.1",
             "ethereumjs-util": "^6.0.0"
+          },
+          "dependencies": {
+            "ethereumjs-util": {
+              "version": "6.2.0",
+              "resolved": "https://registry.npmjs.org/ethereumjs-util/-/ethereumjs-util-6.2.0.tgz",
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+              "requires": {
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+                "bn.js": "^4.11.0",
+                "create-hash": "^1.1.2",
+                "ethjs-util": "0.1.6",
+                "keccak": "^2.0.0",
+                "rlp": "^2.2.3",
+                "secp256k1": "^3.0.1"
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         },
         "ethers": {
@@ -3520,6 +3821,38 @@
           "integrity": "sha1-DU/9gALVMzqrr0oj7tL2N0yfKOc=",
           "dev": true
         },
+        "keccak": {
+          "version": "2.1.0",
+          "resolved": "https://registry.npmjs.org/keccak/-/keccak-2.1.0.tgz",
+          "integrity": "sha512-m1wbJRTo+gWbctZWay9i26v5fFnYkOn7D5PCxJ3fZUGUEb49dE1Pm4BREUYCt/aoO6di7jeoGmhvqN9Nzylm3Q==",
+          "dev": true,
+          "requires": {
+            "bindings": "^1.5.0",
+            "inherits": "^2.0.4",
+            "nan": "^2.14.0",
+            "safe-buffer": "^5.2.0"
+          },
+          "dependencies": {
+            "inherits": {
+              "version": "2.0.4",
+              "resolved": "https://registry.npmjs.org/inherits/-/inherits-2.0.4.tgz",
+              "integrity": "sha512-k/vGaX4/Yla3WzyMCvTQOXYeIHvqOKtnqBduzTHpzpQZzAskKMhZ2K+EnBiSM9zGSoIFeMpXKxa4dYeZIQqewQ==",
+              "dev": true
+            }
+          }
+        },
+        "nan": {
+          "version": "2.14.1",
+          "resolved": "https://registry.npmjs.org/nan/-/nan-2.14.1.tgz",
+          "integrity": "sha512-isWHgVjnFjh2x2yuJ/tj3JbwoHu3UC2dX5G/88Cm24yB6YopVgxvBObDY7n5xW6ExmFhJpSEQqFPvq9zaXc8Jw==",
+          "dev": true
+        },
+        "safe-buffer": {
+          "version": "5.2.0",
+          "resolved": "https://registry.npmjs.org/safe-buffer/-/safe-buffer-5.2.0.tgz",
+          "integrity": "sha512-fZEwUGbVl7kouZs1jCdMLdt95hdIv0ZeHg6L7qPeciMZhZ+/gdesW4wgTARkrFWEpspjEATAzUGPG8N2jJiwbg==",
+          "dev": true
+        },
         "scrypt-js": {
           "version": "2.0.3",
           "resolved": "https://registry.npmjs.org/scrypt-js/-/scrypt-js-2.0.3.tgz",
@@ -6639,6 +6972,21 @@
             "ethereumjs-util": "^6.0.0"
           }
         },
+        "ethereumjs-util": {
+          "version": "6.2.0",
+          "resolved": "https://registry.npmjs.org/ethereumjs-util/-/ethereumjs-util-6.2.0.tgz",
+          "integrity": "sha512-vb0XN9J2QGdZGIEKG2vXM+kUdEivUfU6Wmi5y0cg+LRhDYKnXIZ/Lz7XjFbHRR9VIKq2lVGLzGBkA++y2nOdOQ==",
+          "dev": true,
+          "requires": {
+            "@types/bn.js": "^4.11.3",
+            "bn.js": "^4.11.0",
+            "create-hash": "^1.1.2",
+            "ethjs-util": "0.1.6",
+            "keccak": "^2.0.0",
+            "rlp": "^2.2.3",
+            "secp256k1": "^3.0.1"
+          }
+        },
         "ethers": {
           "version": "4.0.44",
           "resolved": "https://registry.npmjs.org/ethers/-/ethers-4.0.44.tgz",
@@ -6679,6 +7027,26 @@
           "integrity": "sha1-DU/9gALVMzqrr0oj7tL2N0yfKOc=",
           "dev": true
         },
+        "keccak": {
+          "version": "2.1.0",
+          "resolved": "https://registry.npmjs.org/keccak/-/keccak-2.1.0.tgz",
+          "integrity": "sha512-m1wbJRTo+gWbctZWay9i26v5fFnYkOn7D5PCxJ3fZUGUEb49dE1Pm4BREUYCt/aoO6di7jeoGmhvqN9Nzylm3Q==",
+          "dev": true,
+          "requires": {
+            "bindings": "^1.5.0",
+            "inherits": "^2.0.4",
+            "nan": "^2.14.0",
+            "safe-buffer": "^5.2.0"
+          },
+          "dependencies": {
+            "inherits": {
+              "version": "2.0.4",
+              "resolved": "https://registry.npmjs.org/inherits/-/inherits-2.0.4.tgz",
+              "integrity": "sha512-k/vGaX4/Yla3WzyMCvTQOXYeIHvqOKtnqBduzTHpzpQZzAskKMhZ2K+EnBiSM9zGSoIFeMpXKxa4dYeZIQqewQ==",
+              "dev": true
+            }
+          }
+        },
         "nan": {
           "version": "2.14.0",
           "resolved": "https://registry.npmjs.org/nan/-/nan-2.14.0.tgz",
@@ -6915,30 +7283,85 @@
       }
     },
     "ethereumjs-util": {
-      "version": "6.2.0",
-      "resolved": "https://registry.npmjs.org/ethereumjs-util/-/ethereumjs-util-6.2.0.tgz",
-      "integrity": "sha512-vb0XN9J2QGdZGIEKG2vXM+kUdEivUfU6Wmi5y0cg+LRhDYKnXIZ/Lz7XjFbHRR9VIKq2lVGLzGBkA++y2nOdOQ==",
+      "version": "7.0.0",
+      "resolved": "https://registry.npmjs.org/ethereumjs-util/-/ethereumjs-util-7.0.0.tgz",
+      "integrity": "sha512-y4FqiypxmUVdmCqNPRdB2rvyP1pr8ZBO+RVlxGLF12OoTXVPvgJ3omT2AoYLGCXjgbYDwskbbbROklerm2FNcA==",
       "dev": true,
       "requires": {
         "@types/bn.js": "^4.11.3",
-        "bn.js": "^4.11.0",
+        "bn.js": "^5.1.1",
         "create-hash": "^1.1.2",
         "ethjs-util": "0.1.6",
-        "keccak": "^2.0.0",
-        "rlp": "^2.2.3",
-        "secp256k1": "^3.0.1"
+        "keccak": "^3.0.0",
+        "rlp": "^2.2.4",
+        "secp256k1": "^4.0.1"
       },
       "dependencies": {
+        "bn.js": {
+          "version": "5.1.1",
+          "resolved": "https://registry.npmjs.org/bn.js/-/bn.js-5.1.1.tgz",
+          "integrity": "sha512-IUTD/REb78Z2eodka1QZyyEk66pciRcP6Sroka0aI3tG/iwIdYLrBD62RsubR7vqdt3WyX8p4jxeatzmRSphtA==",
+          "dev": true
+        },
+        "elliptic": {
+          "version": "6.5.2",
+          "resolved": "https://registry.npmjs.org/elliptic/-/elliptic-6.5.2.tgz",
+          "integrity": "sha512-f4x70okzZbIQl/NSRLkI/+tteV/9WqL98zx+SQ69KbXxmVrmjwsNUPn/gYJJ0sHvEak24cZgHIPegRePAtA/xw==",
+          "dev": true,
+          "requires": {
+            "bn.js": "^4.4.0",
+            "brorand": "^1.0.1",
+            "hash.js": "^1.0.0",
+            "hmac-drbg": "^1.0.0",
+            "inherits": "^2.0.1",
+            "minimalistic-assert": "^1.0.0",
+            "minimalistic-crypto-utils": "^1.0.0"
+          },
+          "dependencies": {
+            "bn.js": {
+              "version": "4.11.8",
+              "resolved": "https://registry.npmjs.org/bn.js/-/bn.js-4.11.8.tgz",
+              "integrity": "sha512-ItfYfPLkWHUjckQCk8xC+LwxgK8NYcXywGigJgSwOP8Y2iyWT4f2vsZnoOXTTbo+o5yXmIUJ4gn5538SO5S3gA==",
+              "dev": true
+            }
+          }
+        },
         "keccak": {
-          "version": "2.0.0",
-          "resolved": "https://registry.npmjs.org/keccak/-/keccak-2.0.0.tgz",
-          "integrity": "sha512-rKe/lRr0KGhjoz97cwg+oeT1Rj/Y4cjae6glArioUC8JBF9ROGZctwIaaruM7d7naovME4Q8WcQSO908A8qcyQ==",
+          "version": "3.0.0",
+          "resolved": "https://registry.npmjs.org/keccak/-/keccak-3.0.0.tgz",
+          "integrity": "sha512-/4h4FIfFEpTEuySXi/nVFM5rqSKPnnhI7cL4K3MFSwoI3VyM7AhPSq3SsysARtnEBEeIKMBUWD8cTh9nHE8AkA==",
           "dev": true,
           "requires": {
-            "bindings": "^1.2.1",
-            "inherits": "^2.0.3",
-            "nan": "^2.2.1",
-            "safe-buffer": "^5.1.0"
+            "node-addon-api": "^2.0.0",
+            "node-gyp-build": "^4.2.0"
+          }
+        },
+        "rlp": {
+          "version": "2.2.4",
+          "resolved": "https://registry.npmjs.org/rlp/-/rlp-2.2.4.tgz",
+          "integrity": "sha512-fdq2yYCWpAQBhwkZv+Z8o/Z4sPmYm1CUq6P7n6lVTOdb949CnqA0sndXal5C1NleSVSZm6q5F3iEbauyVln/iw==",
+          "dev": true,
+          "requires": {
+            "bn.js": "^4.11.1"
+          },
+          "dependencies": {
+            "bn.js": {
+              "version": "4.11.8",
+              "resolved": "https://registry.npmjs.org/bn.js/-/bn.js-4.11.8.tgz",
+              "integrity": "sha512-ItfYfPLkWHUjckQCk8xC+LwxgK8NYcXywGigJgSwOP8Y2iyWT4f2vsZnoOXTTbo+o5yXmIUJ4gn5538SO5S3gA==",
+              "dev": true
+            }
+          }
+        },
+        "secp256k1": {
+          "version": "4.0.1",
+          "resolved": "https://registry.npmjs.org/secp256k1/-/secp256k1-4.0.1.tgz",
+          "integrity": "sha512-iGRjbGAKfXMqhtdkkuNxsgJQfJO8Oo78Rm7DAvsG3XKngq+nJIOGqrCSXcQqIVsmCj0wFanE5uTKFxV3T9j2wg==",
+          "dev": true,
+          "requires": {
+            "elliptic": "^6.5.2",
+            "node-addon-api": "^2.0.0",
+            "node-gyp-build": "^4.2.0"
           }
         }
       }
@@ -6966,6 +7389,45 @@
           "integrity": "sha512-e5pEa2kBnBOgR4Y/p20pskXI74UEz7de8ZGVo58asOtvSVG5YAbJeELPZxOmt+Bnz3rX753YKhfIn4X4l1PPRQ==",
           "dev": true
         },
+        "ethereumjs-util": {
+          "version": "6.2.0",
+          "resolved": "https://registry.npmjs.org/ethereumjs-util/-/ethereumjs-util-6.2.0.tgz",
+          "integrity": "sha512-vb0XN9J2QGdZGIEKG2vXM+kUdEivUfU6Wmi5y0cg+LRhDYKnXIZ/Lz7XjFbHRR9VIKq2lVGLzGBkA++y2nOdOQ==",
+          "dev": true,
+          "requires": {
+            "@types/bn.js": "^4.11.3",
+            "bn.js": "^4.11.0",
+            "create-hash": "^1.1.2",
+            "ethjs-util": "0.1.6",
+            "keccak": "^2.0.0",
+            "rlp": "^2.2.3",
+            "secp256k1": "^3.0.1"
+          }
+        },
+        "inherits": {
+          "version": "2.0.4",
+          "resolved": "https://registry.npmjs.org/inherits/-/inherits-2.0.4.tgz",
+          "integrity": "sha512-k/vGaX4/Yla3WzyMCvTQOXYeIHvqOKtnqBduzTHpzpQZzAskKMhZ2K+EnBiSM9zGSoIFeMpXKxa4dYeZIQqewQ==",
+          "dev": true
+        },
+        "keccak": {
+          "version": "2.1.0",
+          "resolved": "https://registry.npmjs.org/keccak/-/keccak-2.1.0.tgz",
+          "integrity": "sha512-m1wbJRTo+gWbctZWay9i26v5fFnYkOn7D5PCxJ3fZUGUEb49dE1Pm4BREUYCt/aoO6di7jeoGmhvqN9Nzylm3Q==",
+          "dev": true,
+          "requires": {
+            "bindings": "^1.5.0",
+            "inherits": "^2.0.4",
+            "nan": "^2.14.0",
+            "safe-buffer": "^5.2.0"
+          }
+        },
+        "nan": {
+          "version": "2.14.1",
+          "resolved": "https://registry.npmjs.org/nan/-/nan-2.14.1.tgz",
+          "integrity": "sha512-isWHgVjnFjh2x2yuJ/tj3JbwoHu3UC2dX5G/88Cm24yB6YopVgxvBObDY7n5xW6ExmFhJpSEQqFPvq9zaXc8Jw==",
+          "dev": true
+        },
         "safe-buffer": {
           "version": "5.2.0",
           "resolved": "https://registry.npmjs.org/safe-buffer/-/safe-buffer-5.2.0.tgz",
@@ -31061,6 +31523,12 @@
       "integrity": "sha512-2NpiFHqC87y/zFke0fC0spBXL3bBsoh/p5H1EFhshxjCR5+0g2d6BiXbUFz9v1sAcxsk2htp2eQnNIci2dIYcA==",
       "dev": true
     },
+    "node-addon-api": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/node-addon-api/-/node-addon-api-2.0.0.tgz",
+      "integrity": "sha512-ASCL5U13as7HhOExbT6OlWJJUV/lLzL2voOSP1UVehpRD8FbSrSDjfScK/KwAvVTI5AS6r4VwbOMlIqtvRidnA==",
+      "dev": true
+    },
     "node-environment-flags": {
       "version": "1.0.6",
       "resolved": "https://registry.npmjs.org/node-environment-flags/-/node-environment-flags-1.0.6.tgz",
@@ -31089,6 +31557,12 @@
         "is-stream": "^1.0.1"
       }
     },
+    "node-gyp-build": {
+      "version": "4.2.2",
+      "resolved": "https://registry.npmjs.org/node-gyp-build/-/node-gyp-build-4.2.2.tgz",
+      "integrity": "sha512-Lqh7mrByWCM8Cf9UPqpeoVBBo5Ugx+RKu885GAzmLBVYjeywScxHXPGLa4JfYNZmcNGwzR0Glu5/9GaQZMFqyA==",
+      "dev": true
+    },
     "nofilter": {
       "version": "1.0.3",
       "resolved": "https://registry.npmjs.org/nofilter/-/nofilter-1.0.3.tgz",
@@ -34630,6 +35104,21 @@
               "resolved": "https://registry.npmjs.org/ethereumjs-common/-/ethereumjs-common-1.5.0.tgz",
               "integrity": "sha512-SZOjgK1356hIY7MRj3/ma5qtfr/4B5BL+G4rP/XSMYr2z1H5el4RX5GReYCKmQmYI/nSBmRnwrZ17IfHuG0viQ==",
               "dev": true
+            },
+            "ethereumjs-util": {
+              "version": "6.2.0",
+              "resolved": "https://registry.npmjs.org/ethereumjs-util/-/ethereumjs-util-6.2.0.tgz",
+              "integrity": "sha512-vb0XN9J2QGdZGIEKG2vXM+kUdEivUfU6Wmi5y0cg+LRhDYKnXIZ/Lz7XjFbHRR9VIKq2lVGLzGBkA++y2nOdOQ==",
+              "dev": true,
+              "requires": {
+                "@types/bn.js": "^4.11.3",
+                "bn.js": "^4.11.0",
+                "create-hash": "^1.1.2",
+                "ethjs-util": "0.1.6",
+                "keccak": "^2.0.0",
+                "rlp": "^2.2.3",
+                "secp256k1": "^3.0.1"
+              }
             }
           }
         },
@@ -34677,12 +35166,44 @@
           "integrity": "sha1-DU/9gALVMzqrr0oj7tL2N0yfKOc=",
           "dev": true
         },
+        "keccak": {
+          "version": "2.1.0",
+          "resolved": "https://registry.npmjs.org/keccak/-/keccak-2.1.0.tgz",
+          "integrity": "sha512-m1wbJRTo+gWbctZWay9i26v5fFnYkOn7D5PCxJ3fZUGUEb49dE1Pm4BREUYCt/aoO6di7jeoGmhvqN9Nzylm3Q==",
+          "dev": true,
+          "requires": {
+            "bindings": "^1.5.0",
+            "inherits": "^2.0.4",
+            "nan": "^2.14.0",
+            "safe-buffer": "^5.2.0"
+          },
+          "dependencies": {
+            "inherits": {
+              "version": "2.0.4",
+              "resolved": "https://registry.npmjs.org/inherits/-/inherits-2.0.4.tgz",
+              "integrity": "sha512-k/vGaX4/Yla3WzyMCvTQOXYeIHvqOKtnqBduzTHpzpQZzAskKMhZ2K+EnBiSM9zGSoIFeMpXKxa4dYeZIQqewQ==",
+              "dev": true
+            }
+          }
+        },
         "lodash": {
           "version": "4.17.15",
           "resolved": "https://registry.npmjs.org/lodash/-/lodash-4.17.15.tgz",
           "integrity": "sha512-8xOcRHvCjnocdS5cpwXQXVzmmh5e5+saE2QGoeQmbKmRS6J3VQppPOIt0MnmE+4xlZoumy0GPG0D0MVIQbNA1A==",
           "dev": true
         },
+        "nan": {
+          "version": "2.14.1",
+          "resolved": "https://registry.npmjs.org/nan/-/nan-2.14.1.tgz",
+          "integrity": "sha512-isWHgVjnFjh2x2yuJ/tj3JbwoHu3UC2dX5G/88Cm24yB6YopVgxvBObDY7n5xW6ExmFhJpSEQqFPvq9zaXc8Jw==",
+          "dev": true
+        },
+        "safe-buffer": {
+          "version": "5.2.0",
+          "resolved": "https://registry.npmjs.org/safe-buffer/-/safe-buffer-5.2.0.tgz",
+          "integrity": "sha512-fZEwUGbVl7kouZs1jCdMLdt95hdIv0ZeHg6L7qPeciMZhZ+/gdesW4wgTARkrFWEpspjEATAzUGPG8N2jJiwbg==",
+          "dev": true
+        },
         "scrypt-js": {
           "version": "2.0.3",
           "resolved": "https://registry.npmjs.org/scrypt-js/-/scrypt-js-2.0.3.tgz",

package.json

@@ -58,7 +58,7 @@
     "eslint-plugin-node": "^10.0.0",
     "eslint-plugin-promise": "^4.2.1",
     "eslint-plugin-standard": "^4.0.1",
-    "ethereumjs-util": "^6.2.0",
+    "ethereumjs-util": "^7.0.0",
     "ganache-core-coverage": "https://github.com/OpenZeppelin/ganache-core-coverage/releases/download/2.5.3-coverage/ganache-core-coverage-2.5.3.tgz",
     "lodash.startcase": "^4.4.0",
     "lodash.zip": "^4.2.0",

test/cryptography/MerkleProof.test.js

@@ -3,7 +3,7 @@ const { contract } = require('@openzeppelin/test-environment');
 require('@openzeppelin/test-helpers');
 
 const { MerkleTree } = require('../helpers/merkleTree.js');
-const { keccak256, bufferToHex } = require('ethereumjs-util');
+const { keccakFromString, bufferToHex } = require('ethereumjs-util');
 
 const { expect } = require('chai');
 
@@ -23,7 +23,7 @@ describe('MerkleProof', function () {
 
       const proof = merkleTree.getHexProof(elements[0]);
 
-      const leaf = bufferToHex(keccak256(elements[0]));
+      const leaf = bufferToHex(keccakFromString(elements[0]));
 
       expect(await this.merkleProof.verify(proof, root, leaf)).to.equal(true);
     });
@@ -34,7 +34,7 @@ describe('MerkleProof', function () {
 
       const correctRoot = correctMerkleTree.getHexRoot();
 
-      const correctLeaf = bufferToHex(keccak256(correctElements[0]));
+      const correctLeaf = bufferToHex(keccakFromString(correctElements[0]));
 
       const badElements = ['d', 'e', 'f'];
       const badMerkleTree = new MerkleTree(badElements);
@@ -53,7 +53,7 @@ describe('MerkleProof', function () {
       const proof = merkleTree.getHexProof(elements[0]);
       const badProof = proof.slice(0, proof.length - 5);
 
-      const leaf = bufferToHex(keccak256(elements[0]));
+      const leaf = bufferToHex(keccakFromString(elements[0]));
 
       expect(await this.merkleProof.verify(badProof, root, leaf)).to.equal(false);
     });

test/helpers/merkleTree.js

@@ -1,9 +1,9 @@
-const { keccak256, bufferToHex } = require('ethereumjs-util');
+const { keccak256, keccakFromString, bufferToHex } = require('ethereumjs-util');
 
 class MerkleTree {
   constructor (elements) {
     // Filter empty strings and hash elements
-    this.elements = elements.filter(el => el).map(el => keccak256(el));
+    this.elements = elements.filter(el => el).map(el => keccakFromString(el));
 
     // Sort elements
     this.elements.sort(Buffer.compare);
@@ -97,7 +97,7 @@ class MerkleTree {
 
     // Convert element to 32 byte hash if it is not one already
     if (el.length !== 32 || !Buffer.isBuffer(el)) {
-      hash = keccak256(el);
+      hash = keccakFromString(el);
     } else {
       hash = el;
     }

test/introspection/ERC1820Implementer.test.js

@@ -1,7 +1,7 @@
 const { accounts, contract } = require('@openzeppelin/test-environment');
 
 const { expectRevert, singletons } = require('@openzeppelin/test-helpers');
-const { bufferToHex, keccak256 } = require('ethereumjs-util');
+const { bufferToHex, keccakFromString } = require('ethereumjs-util');
 
 const { expect } = require('chai');
 
@@ -10,14 +10,14 @@ const ERC1820ImplementerMock = contract.fromArtifact('ERC1820ImplementerMock');
 describe('ERC1820Implementer', function () {
   const [ registryFunder, implementee, other ] = accounts;
 
-  const ERC1820_ACCEPT_MAGIC = bufferToHex(keccak256('ERC1820_ACCEPT_MAGIC'));
+  const ERC1820_ACCEPT_MAGIC = bufferToHex(keccakFromString('ERC1820_ACCEPT_MAGIC'));
 
   beforeEach(async function () {
     this.implementer = await ERC1820ImplementerMock.new();
     this.registry = await singletons.ERC1820Registry(registryFunder);
 
-    this.interfaceA = bufferToHex(keccak256('interfaceA'));
-    this.interfaceB = bufferToHex(keccak256('interfaceB'));
+    this.interfaceA = bufferToHex(keccakFromString('interfaceA'));
+    this.interfaceB = bufferToHex(keccakFromString('interfaceB'));
   });
 
   context('with no registered interfaces', function () {