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1433: Create user hashing for Koblenz
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10 changes: 10 additions & 0 deletions
10
backend/src/main/kotlin/app/ehrenamtskarte/backend/common/utils/Environment.kt
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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? { | ||
return System.getenv(name) | ||
} | ||
} | ||
} |
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backend/src/main/kotlin/app/ehrenamtskarte/backend/verification/Argon2IdHasher.kt
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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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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() | ||
} | ||
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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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