CryptoJS Changeset - 90018dea7eac

Changeset - 90018dea7eac

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Laman - 5 years ago 2019-07-02 14:46:42

base64 encoding

2 files changed with 64 insertions and 0 deletions:

spec/test/utilSpec.js

src/util.js

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spec/test/utilSpec.js

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 /* global expect */
 describe("Util",function(){
   let cryptoJS=require("../../dist/main.js");
 	let util=cryptoJS.util;
 	let utf=[ // https://tools.ietf.org/html/rfc3629#page-8
 		["",[]],
 		["abc",[97,98,99]],
 		["å",[195,165]],
 		["🚅",[240,159,154,133]],
 		["žír",[0xc5,0xbe,0xc3,0xad,114]],
 		["A\u2262\u0391.",[0x41,0xE2,0x89,0xA2,0xCE,0x91,0x2E]],
 		["\uD55C\uAD6D\uC5B4",[0xED,0x95,0x9C,0xEA,0xB5,0xAD,0xEC,0x96,0xB4]],
 		["\ud84c\udfb4",[0xf0,0xa3,0x8e,0xb4]]
 	];
 	let base64=[
 		[[],""],
 		[[102],"Zg=="],
 		[[102,111],"Zm8="],
 		[[102,111,111],"Zm9v"],
 		[[102,111,111,98],"Zm9vYg=="],
 		[[102,111,111,98,97],"Zm9vYmE="],
 		[[102,111,111,98,97,114],"Zm9vYmFy"]
 	];
 	describe("bytes2int32s",function(){
 		it("should pack bytes into 32b integers",function(){
 			expect(util.bytes2int32s([])).toEqual([]);
 			expect(util.bytes2int32s([0])).toEqual([0]);
 			expect(util.bytes2int32s([1])).toEqual([1]);
 			expect(util.bytes2int32s([0x12,0x34,0x56,0x78,0x9a])).toEqual([0x78563412,0x9a]);
 		});
 	});
 	describe("str2utf8",function(){
 		it("should encode a String into bytes in UTF-8",function(){
 			utf.forEach(couple=>expect(util.str2utf8(couple[0])).toEqual(couple[1]));
 		});
 	});
 	describe("utf82str",function(){
 		it("should decode a String from UTF-8 bytes",function(){
 			utf.forEach(couple=>expect(util.utf82str(couple[1])).toEqual(couple[0]));
 		});
 	});
 	describe("bytes2base64",function(){
 		it("should correctly encode bytes into base64",function(){
 			base64.forEach(couple=>expect(util.bytes2base64(couple[0])).toEqual(couple[1]));
 });
 	});
 	describe("base642bytes",function(){
 		it("should correctly decode bytes from base64",function(){
 			base64.forEach(couple=>expect(util.base642bytes(couple[1])).toEqual(couple[0]));
 		});
 	});
 });

src/util.js

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@@ @@ -51,48 +51,90 @@ export function str2utf8(s){ @@
 	for(let i=0; c!==undefined; i++,c=s.codePointAt(i)){
 		if(c<0x80){res.push(c);}
 		else if(c<0x800){
 			res.push(0b11000000|(c>>>6));
 			res.push(0b10000000|(c&0b111111));
+		}
 		else if(c<0x10000){
 			res.push(0b11100000|(c>>>12));
 			res.push(0b10000000|((c>>>6)&0b111111));
 			res.push(0b10000000|(c&0b111111));
+		}
 		else{
 			res.push(0b11110000|(c>>>18));
 			res.push(0b10000000|((c>>>12)&0b111111));
 			res.push(0b10000000|((c>>>6)&0b111111));
 			res.push(0b10000000|(c&0b111111));
+		}
 		if(c>0xffff){i++;} // skip surrogate
+	}
 	return res;
+}
 export function utf82str(arr){
 	let res=[];
 	for(let i=0;i<arr.length;i++){
 		let x=arr[i];
 		if(x<=0b1111111){res.push(x);}
 		else if(x<=0b11011111){
 			let a=x&0b11111;
 			let b=arr[++i]&0b111111;
 			res.push(a<<6|b);
+		}
 		else if(x<=0b11101111){
 			let a=x&0b1111;
 			let b=arr[++i]&0b111111;
 			let c=arr[++i]&0b111111;
 			res.push(a<<12|b<<6|c);
+		}
 		else{
 			let a=x&0b111;
 			let b=arr[++i]&0b111111;
 			let c=arr[++i]&0b111111;
 			let d=arr[++i]&0b111111;
 			res.push(a<<18|b<<12|c<<6|d);
+		}
+	}
 	return res.map(x=>String.fromCodePoint(x)).join("");
+}
 const mapping="ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/".split("");
 const remapping=new Array(128);
 mapping.forEach((c,i)=>{remapping[c.charCodeAt(0)]=i;});
 export function bytes2base64(byteArr){
 	let arr=byteArr.concat();
 	let out=[];
 	let rem=(3-arr.length%3)%3;
 	for(let i=0;i<rem;i++){arr.push(0);} // pad array to a multiple of 3
 	for(let i=0;i<arr.length;i+=3){ // encode 3 bytes into 4 characters
 		out.push(mapping[arr[i]>>>2&63]);
 		out.push(mapping[((arr[i]&3)<<4)+(arr[i+1]>>>4&15)]);
 		out.push(mapping[((arr[i+1]&15)<<2)+(arr[i+2]>>>6&3)]);
 		out.push(mapping[arr[i+2]&63]);
+	}
 	for(let i=0;i<rem;i++){out.pop();}
 	for(let i=0;i<rem;i++){out.push("=");}
 	return out.join("");
+}
 export function base642bytes(str){
 	let out=[];
 	for(let i=0;i<str.length;i+=4){
 		let b1=remapping[str.charCodeAt(i)];
 		let b2=remapping[str.charCodeAt(i+1)];
 		let b3=remapping[str.charCodeAt(i+2)];
 		let b4=remapping[str.charCodeAt(i+3)];
 		out.push((b1<<2)+(b2>>4&3));
 		out.push(((b2&15)<<4)+(b3>>2&15));
 		out.push(((b3&3)<<6)+b4);
+	}
 	for(let i=1; i<3&&str[str.length-i]=="="; i++){out.pop();}
 	return out;
+}

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