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1433: Create user hashing for Koblenz
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8 changes: 8 additions & 0 deletions
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backend/src/main/kotlin/app/ehrenamtskarte/backend/common/utils/Environment.kt
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,8 @@ | ||
| package app.ehrenamtskarte.backend.common.utils | ||
|
|
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| // This helper class was created to enable mocking getenv in Tests | ||
| class Environment { | ||
| companion object { | ||
| fun getVariable(name: String): String? = System.getenv(name) | ||
| } | ||
| } |
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85 changes: 85 additions & 0 deletions
85
backend/src/main/kotlin/app/ehrenamtskarte/backend/verification/Argon2IdHasher.kt
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,85 @@ | ||
| import app.ehrenamtskarte.backend.common.utils.Environment | ||
| import app.ehrenamtskarte.backend.common.webservice.KOBLENZ_PEPPER_SYS_ENV | ||
| import app.ehrenamtskarte.backend.verification.CanonicalJson | ||
| import org.bouncycastle.crypto.generators.Argon2BytesGenerator | ||
| import org.bouncycastle.crypto.params.Argon2Parameters | ||
| import java.nio.charset.StandardCharsets | ||
| import java.util.Base64 | ||
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|
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| class Argon2IdHasher { | ||
| companion object { | ||
| /** | ||
| * Copied from spring-security Argon2EncodingUtils.java licenced under Apache 2.0 | ||
| * | ||
| * Encodes a raw Argon2-hash and its parameters into the standard Argon2-hash-string | ||
| * as specified in the reference implementation | ||
| * (https://github.com/P-H-C/phc-winner-argon2/blob/master/src/encoding.c#L244): | ||
| * | ||
| * {@code $argon2<T>[$v=<num>]$m=<num>,t=<num>,p=<num>$<bin>$<bin>} | ||
| **/ | ||
| @Throws(IllegalArgumentException::class) | ||
| fun encode( | ||
| hash: ByteArray?, | ||
| parameters: Argon2Parameters | ||
| ): String? { | ||
| val b64encoder: Base64.Encoder = Base64.getEncoder().withoutPadding() | ||
| val stringBuilder = StringBuilder() | ||
| val type = | ||
| when (parameters.type) { | ||
| Argon2Parameters.ARGON2_d -> "\$argon2d" | ||
| Argon2Parameters.ARGON2_i -> "\$argon2i" | ||
| Argon2Parameters.ARGON2_id -> "\$argon2id" | ||
| else -> throw IllegalArgumentException("Invalid algorithm type: " + parameters.type) | ||
| } | ||
| stringBuilder.append(type) | ||
| stringBuilder | ||
| .append("\$v=") | ||
| .append(parameters.version) | ||
| .append("\$m=") | ||
| .append(parameters.memory) | ||
| .append(",t=") | ||
| .append(parameters.iterations) | ||
| .append(",p=") | ||
| .append(parameters.lanes) | ||
| if (parameters.salt != null) { | ||
| stringBuilder.append("$").append(b64encoder.encodeToString(parameters.salt)) | ||
| } | ||
| stringBuilder.append("$").append(b64encoder.encodeToString(hash)) | ||
| return stringBuilder.toString() | ||
| } | ||
|
|
||
| fun hashUserData(cardInfo: Card.CardInfo): String? { | ||
| val canonicalJson = CanonicalJson.messageToMap(cardInfo) | ||
| val hashLength = 32 | ||
| if (!isCanonicalJsonValid(canonicalJson)) { | ||
| throw Exception("Invalid Json input for hashing") | ||
| } | ||
|
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| val pepper = Environment.getVariable(KOBLENZ_PEPPER_SYS_ENV) // TODO handle if Null | ||
| val pepperByteArray = pepper?.toByteArray(StandardCharsets.UTF_8) | ||
| val params = | ||
| Argon2Parameters | ||
| .Builder(Argon2Parameters.ARGON2_id) | ||
| .withVersion(19) | ||
| .withIterations(2) | ||
| .withSalt(pepperByteArray) | ||
| .withParallelism(1) | ||
| .withMemoryAsKB(16) | ||
| .build() | ||
|
|
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| val generator = Argon2BytesGenerator() | ||
| generator.init(params) | ||
| val result = ByteArray(hashLength) | ||
| generator.generateBytes(CanonicalJson.serializeToString(canonicalJson).toCharArray(), result) | ||
| return encode(result, params) | ||
| } | ||
|
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| private fun isCanonicalJsonValid(canonicalJson: Map<String, Any>): Boolean { | ||
| val hasName = canonicalJson.get("1") != null | ||
| val hasExtensions = canonicalJson.get("3") as? Map<String, Any> | ||
| val hasKoblenzPassExtension = hasExtensions?.get("6") as? Map<String, String> | ||
| val hasKoblenzPassId = hasKoblenzPassExtension?.get("1") != null | ||
| return hasName && hasKoblenzPassId | ||
| } | ||
| } | ||
| } |
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